China BaoWu Steel – China Baowu Group- whatsapp: +8613256761911

Inconel 718 Alloy: A Superior Choice for High-Temperature Applications- whatsapp: +8613256761911

China BaoWu Steel — Fri, 19 Apr 2024 07:04:26 +0000

Inconel 718 Alloy: A Superior Choice for High-Temperature Applications

Inconel 718 alloy, a precipitation-hardened nickel-chromium-iron alloy containing niobium and molybdenum, exhibits high strength, good toughness, and corrosion resistance in both high and low-temperature environments, particularly at 700℃. It can be supplied in a solution-treated or precipitation-hardened state.

Characteristics

1. Ease of machinability

2. High tensile strength, fatigue strength, creep strength, and fracture strength at 700℃

3. High oxidation resistance at 1000℃

4. Stable chemical properties at low temperatures

5. Excellent weldability

Corrosion Resistance

Inconel 718 alloy demonstrates outstanding resistance to stress corrosion cracking and pitting corrosion in both high and low-temperature environments. Its oxidation resistance at high temperatures is particularly remarkable.

Applications

Due to its high-temperature strength, excellent corrosion resistance, and machinability at 700℃, Inconel 718 alloy finds wide application in various demanding fields:

1. Gas turbines

2. Liquid-fueled rockets

3. Cryogenic engineering

4. Acidic environments

5. Nuclear engineering.

In conclusion, Inconel 718 alloy stands out for its exceptional properties and versatile applications in challenging environments, making it a sought-after material in industries requiring high performance and reliability.

By leveraging the unique qualities of Inconel 718 alloy, industries can achieve enhanced performance and durability in their applications, ensuring reliable operation under extreme conditions.

For more information on Inconel 718 alloy and its applications, consult with industry experts to explore the full potential of this advanced material.

Shandong Baowu Steel Group supplies Inconel 718 round bars in various lengths and diameters. We also have a variety of other steel products to meet each customer’s usage requirements and specifications. Inquiries are welcome.

Carbon steel bar ship to Philippines- whatsapp: +8613256761911

China BaoWu Steel — Wed, 27 Mar 2024 09:11:37 +0000

Carbon steel bar ship to Philippines

Our customer from Philippines orders again. We should not only ensure the quality of our products, but also ensure that they are not damaged in transit. If you are interested of our products, please contact with me.

Baowu Purlin.pdf- whatsapp: +8613256761911

China BaoWu Steel — Thu, 21 Mar 2024 07:28:03 +0000

Baowu Purlin Download

Exploring the Distinction Between C Purlin and C-Shaped Steel- whatsapp: +8613256761911

China BaoWu Steel — Tue, 05 Mar 2024 09:07:45 +0000

Exploring the Distinction Between C Purlin and C-Shaped Steel

When it comes to construction materials, C purlins and C-shaped steel are two common choices that are often confused due to their similar appearance. In order to make informed decisions, it is crucial to understand the differences between these two structural components.

C purlins are cold-formed steel sections that are shaped like a squared-off letter C. They are widely used in the construction industry for providing structural support in roofing, walls, and floor joists. C purlins are lightweight, cost-effective, and easy to install, making them a popular choice for various building projects.

On the other hand, C-shaped steel, also known as C channel steel, is a hot-rolled steel profile that is shaped like a C. Unlike C purlins, C-shaped steel is typically used for industrial applications where higher load-bearing capacity is required. C-shaped steel offers superior strength and durability, making it suitable for heavy-duty structures such as bridges, warehouses, and industrial buildings.

In summary, the key difference between C purlin and C-shaped steel lies in their manufacturing process and intended usage. While C purlins are ideal for light to medium-duty applications in residential and commercial buildings, C-shaped steel is designed for heavy-duty industrial projects that demand superior strength and load-bearing capacity.

In conclusion, understanding the distinction between C purlin and C-shaped steel is essential for choosing the right material for your construction project. By considering factors such as load requirements, structural integrity, and budget constraints, you can make an informed decision that aligns with the specific needs of your building project.

The functions and uses of steel sheet piles- whatsapp: +8613256761911

China BaoWu Steel — Thu, 09 Nov 2023 08:22:11 +0000

The functions and uses of steel sheet piles

一. The function of steel sheet piles
Steel sheet piles are long structures made of steel plates that are used to reinforce and support soil and building structures. Specific functions include:
1. Protect the building structure: Steel sheet piles can protect the foundation of the building from erosion when the building structure is fully fixed.
2. Guide isolation walls, cofferdams, etc.: During the construction process of isolation walls, cofferdams, etc., steel sheet piles are needed to reinforce the soil and prevent cement penetration.
3. Support deep foundations, retaining walls, etc.: In projects such as deep foundations and retaining walls, steel sheet piles are needed to reinforce and support the soil and building structures.
4. Increase the elastic modulus: When fixing buildings, steel sheet piles can increase the elastic modulus of the building, thereby reducing the risk of earthquakes in the building.

二. Use of steel sheet piles
Steel sheet piles are widely used in civil engineering, mainly in the following aspects:
1. Tunnel and subway construction: In tunnel and subway construction, steel sheet piles are needed to support and reinforce soil and building structures.
2. Retaining wall construction: Steel sheet piles can be used in retaining wall construction to support and reinforce soil.
3. River channel management: During the river channel management process, steel sheet piles are needed to reinforce the river bed and prevent cement penetration.
4. Marine engineering: Steel sheet piles can be used in marine engineering, such as the support and reinforcement of submarine pipelines.
5. Dock construction: In dock construction, steel sheet piles are needed to build port infrastructure and support dock buildings.
In short, steel sheet pile is a high-strength, durable and reusable basic engineering material, which is widely used in civil engineering, water conservancy projects, highway construction, construction and urban infrastructure and other fields.

Duplex stainless steel 2205 welding process and precautions- whatsapp: +8613256761911

China BaoWu Steel — Wed, 13 Sep 2023 09:08:40 +0000

Duplex stainless steel 2205 welding process and precautions

1.The second generation duplex stainless steel (commonly known as standard duplex stainless steel) has the characteristics of ultra-low carbon, low nitrogen, typical composition Cr5%Ni0.17%n and 2205 higher nitrogen content than the first generation duplex stainless steel, improving Improves the resistance to stress corrosion and pitting corrosion in acidic media with high chloride ion concentration. Nitrogen is a strong austenite-forming element. Adding nitrogen to duplex stainless steel not only improves the strength of the steel, but also does not significantly damage the plasticity and toughness of the steel, and inhibits the precipitation and retardation of carbides.

2.The second generation duplex stainless steel (commonly known as standard duplex stainless steel) has the characteristics of ultra-low carbon, low nitrogen, typical composition Cr5%Ni0.17%n and 2205 higher nitrogen content than the first generation duplex stainless steel, improving Improves the resistance to stress corrosion and pitting corrosion in acidic media with high chloride ion concentration. Nitrogen is a strong austenite-forming element. Adding nitrogen to duplex stainless steel not only improves the strength of the steel, but also does not significantly damage the plasticity and toughness of the steel, and inhibits the precipitation and retardation of carbides.

3.The yield strength and stress corrosion resistance of two-phase stainless steel are almost twice that of austenitic stainless steel, which can save materials under the same pressure level. The linear expansion coefficient of austenitic stainless steel is lower than that of austenitic stainless steel and close to that of low carbon steel. Making the connection between duplex stainless steel and carbon steel more suitable has important engineering significance. Both forging and cold stamping are inferior to austenitic stainless steel.

4.Weldability: Duplex stainless steel 2205 has good weldability and has low sensitivity to cold and hot cracks during welding. Usually there is no preheating before welding and no heat treatment after welding. Due to the high nitrogen content, the tendency of single-phase ferrite in the heat-affected zone is small. When welding materials are properly selected and the welding line energy is controlled at this time, it has good overall performance.

5.Hot cracking: Hot cracking sensitivity is much lower than that of austenitic stainless steel. This is because the nickel content is not high, the impurities that easily form low-melting-point eutectic are very low, and the low-melting-point liquid film is not easy to form. In addition, there is no danger of rapid growth of grains at high temperatures.

6.Embrittlement of the heat-affected zone: The main problem with duplex stainless steel welding is not the weld, but the heat-affected zone. Since the heat-affected zone is in a non-equilibrium state of rapid cooling under the action of welding heat cycles, more ferrite is always retained after cooling, which increases corrosion tendency and hydrogen-induced cracking (brittleness) susceptibility.

7.Welding metallurgy: During the welding process of duplex stainless steel, a series of changes occur in the microstructure of the weld metal and heat-affected zone under the action of thermal cycles. At high temperatures, the metallographic structure of duplex stainless steel is ferrite, and austenite precipitates during cooling. The amount of austenite precipitation is affected by many factors.

8.The mechanical properties and corrosion resistance of duplex stainless steel welded joints depend on whether the appropriate welded joint ratio can be maintained. Therefore, welding revolves around how to ensure a double-sided structure. When the amount of ferrite and austenite is close to 50%, the performance is good and the properties of the base materials are close to each other. Changing this relationship will reduce the corrosion resistance and mechanical properties of duplex stainless steel welded joints. The optimal ferrite content of 2205 duplex stainless steel is 45%. When the ferrite content is less than 25%, the strength and stress corrosion cracking ability decrease. Excess ferrite content greater than 75% will also affect the corrosion resistance and reduce the impact toughness. .

9.Comparison factors: The balance of ferrite and austenite in welded joints is not only affected by the content of alloy elements in the steel, but also by the filler metal, welding thermal cycle and shielding gas.

10.Influence of alloying elements: According to research and a large number of experiments, it is found that nitrogen, the base material, is very important. Nitrogen plays an important role in ensuring sufficient austenite formation in the weld metal and heat affected zone after welding. Nitrogen (such as nickel) forms austenite values and expands austenite elements, but the ability of nitrogen is also greater than that of nickel, which can prevent the appearance of single phases after welding and prevent the precipitation of harmful metal phases. Due to the influence of the welding thermal cycle, when the composition of autogenous welding or the filler metal is the same as that of the base metal, the ferrite content of the weld metal increases sharply, and even a pure ferrite structure appears. In order to suppress the excessive increase of ferrite in the weld, the welding metal with main austenite is the welding tendency of duplex stainless steel. Usually, the two methods are to add nickel or nitrogen to the welding material. Typically, the nickel content is 2% to 4% higher than the base metal, for example, the 2205 filler metal has a nickel content of up to 8% to 10%. The nitrogen-containing solder ratio can only improve the effect of nickel solder, but the addition of nitrogen can not only delay the precipitation between metals, but also improve the strength and corrosion resistance of the weld metal. At present, filling materials are usually based on adding nickel, and then adding nitrogen with the same content of the base metal.

11.For duplex stainless steel 2205, Sandvik 22.8.3L (ER2209) welding wire is used for TIG welding, and Avesta 2205AC/DC welding rod is used for TIG welding to meet the requirements of welding materials. These characteristics of duplex stainless steel 2205 and welding materials on alloy elements provide a certain range for the selection of welding process parameters, that is, welding line energy, which is very beneficial to welding.

12.Thermal cycle: The biggest feature of duplex stainless steel welding is that the welding heat cycle has an impact on the structure of the welded joint. Whether it is the weld seam or the hot film star zone, phase change will occur, which has a great impact on the performance of the welded joint. Therefore, multi-layer and multi-pass welding is beneficial. The subsequent welds have a heat treatment effect on the previous weld. The ferrite in the weld metal is further transformed into austenite, and the austenite in the heat affected zone adjacent to the weld is The bulk phase is also increased, which can refine the ferrite grains and reduce the precipitation of carbides and nitrides from crystals and grain boundaries, thereby significantly improving the structure and performance of the entire welded joint. Due to the influence of the welding thermal cycle, the weld beads in contact with the medium should be welded with duplex stainless steel, which is opposite to the requirements for the welding sequence of austenitic stainless steel.

13.Influence of process parameters: The number of welding processes, that is, the welding line energy, also plays a key role in the balance of the two-phase microstructure. Since duplex stainless steel is 100% ferrite at high temperatures, if the line energy is too small If the cooling rate of the heat-affected zone is too fast, excessive ferrite precipitated from austenite will continue to exist under the supercooling conditions of the greenhouse. If the line energy is too large and the cooling rate is too slow, although a sufficient amount of austenite can be obtained, it will also lead to the grain growth of ferrite in the heat-affected zone and the precipitation of harmful metal phases equal to 0, resulting in joint embrittlement. . To avoid the above situation, the best measures are to control the weld energy and interpass temperature and use filler metal.

14.Influence of process parameters: The number of welding processes, that is, the welding line energy, also plays a key role in the balance of the two-phase microstructure. Since duplex stainless steel is 100% ferrite at high temperatures, if the line energy is too small If the cooling rate of the heat-affected zone is too fast, excessive ferrite precipitated from austenite will continue to exist under the supercooling conditions of the greenhouse. If the line energy is too large and the cooling rate is too slow, although a sufficient amount of austenite can be obtained, it will also lead to the grain growth of ferrite in the heat-affected zone and the precipitation of harmful metal phases equal to 0, resulting in joint embrittlement. . To avoid the above situation, the best measures are to control the weld energy and interpass temperature and use filler metal.

Summary of twelve common defects of stainless steel cold-rolled plates- whatsapp: +8613256761911

China BaoWu Steel — Thu, 27 Jul 2023 06:25:02 +0000

A must-have for stainless steel people: a summary of twelve common defects in stainless steel cold-rolled plates

304L stainless steel manufacturer Shandong Baowu Steel Group will share with you today a summary of twelve common defects in stainless steel cold-rolled plates. Stainless steel people must read! Common defects include surface inclusions, scarring, pressed iron oxide scale, under pickling, sticking Knot marks, oxidized color, emulsion spots, scratches, wrinkles, roll marks, embossing, towers, etc.

Surface inclusions
Defect characteristics:
The surface of the stainless steel cold-rolled sheet presents point-like, block-like or line-like non-metallic inclusions, distributed intermittently or continuously along the rolling direction, and its color is reddish-brown, dark gray or white. In severe cases, holes, cracks, and broken strips will appear in the stainless steel cold-rolled plate.
cause:
1) Poor slagging during steelmaking, high viscosity of molten steel, poor fluidity, slag cannot float up, and many non-metallic inclusions in steel.
2) The casting temperature is low, the boiling is poor, and the inclusions do not float up.
3) During continuous casting, the mold slag band is mixed into the steel.
4) The non-metallic materials in the molten steel tank, steel ingot or injection pipe have not been cleaned

Scarring
Defect characteristics:
Irregular tongue-shaped and fish-scale black spots appear on the surface of the stainless steel cold-rolled plate, with different distribution areas and uneven indentation depths. This type of iron sheet is difficult to wash off in the pickling process, and pits are formed when the iron sheet falls off.
cause:
1) In steelmaking, the inside of the ingot mold is not clean, and the mold wall loses flesh. When pouring, steel rot splashes, sticks to the mold wall, and oxidizes. The casting temperature is low, and sometimes the injection flow is interrupted. Improper addition of mold slag during ingot injection will cause molten steel to splash.
2) In terms of steel rolling, the remaining scars on the surface of the slab have not been cleaned, and remain on the stainless steel cold-rolled plate after rolling

Pressed iron oxide scale
Defect characteristics:
Defects are black spots in the form of dots, strips or fish scales, with different distribution areas and uneven depth of pressure. This type of iron sheet is difficult to wash off in the pickling process, and pits are formed when the iron sheet falls off.
cause:
1) The heating temperature of the slab is too high and the time is too long. There is a strong oxidizing atmosphere in the furnace, and the furnace oxide iron sheet is pressed in during rolling.
2) The pressure of the high pressure water is insufficient, and the oxide scale has not been cleaned before continuous rolling.
3) The high-pressure water nozzle is blocked, and the local oxide scale is not removed.
4) The scale-collecting pipes are not opened enough, and the descaling is not clean.

Under pickling
Defect characteristics:
When the upper and lower surfaces of the stainless steel cold-rolled plate are severe, the entire plate surface appears flaky, black-gray streaked, and dull.
cause:
1) The temperature and cooling rate of each part of the stainless steel cold-rolled plate are different, that is, the temperature and cooling rate of the head, middle and tail along the length direction of the stainless steel cold-rolled plate, as well as the edges and middle parts along the width are different, making it the same as the stainless steel cold-rolled plate The iron sheet structure and thickness of each part of the plate are different. Generally speaking, the temperature of the head and middle of the stainless steel cold-rolled plate is 30-50 degrees Celsius higher than that of the tail. Therefore, the iron sheet at the head is thicker and the iron sheet at the tail is thinner. In the same situation, it is easy to cause local uncleanness.
2) The pickling process is not appropriate, such as the concentration and temperature of pickling are low, the pickling speed is too fast, the pickling time is insufficient, or the acid solution is not replenished in time due to the high concentration of ferrous iron, etc.
3) The tensile coefficient of the stretching descaling machine is not enough, so that the iron sheet is not fully broken, peeled off, and the pickling effect is affected.
4) The shape of stainless steel cold-rolled plate is poor, such as sickle crescent, wave shape, etc., so that the effect of mechanical descaling is poor, and it is easy to cause partial pickling.

Bond marks
Defect characteristics:
The layers of annealed steel coil are bonded to each other, which is called bonding. Point-shaped arc creases are formed after flattening. Point-shaped arc-shaped creases along the rolling direction are strip-shaped bonding. Severe surface bonding, flattening The uncoil is torn or there are holes and becomes a waste roll
cause:
1) The rolling tension is too large or the tension fluctuates, and the shape of the plate is not good, resulting in bulging, and bonding occurs at the part where the interlayer pressure increases.
2) The surface roughness is too small.
3) The steel is too soft, and the amount of carbon and silicon is low.
4) The heat treatment furnace temperature is too high or the annealing cooling rate is too fast.
5) The steel coil is injured by collision before loading the furnace

Oxidation color
Defect characteristics:
The surface of stainless steel cold-rolled sheet is oxidized, and its color gradually transitions from dark blue at the edge to light blue, brown, and light yellow, collectively referred to as oxidation color.
cause:
During annealing, the protective cover is not tightly sealed or leaks air, resulting in oxidation of stainless steel cold-rolled coils.
Bell furnace annealing process, high temperature out of the furnace (steel coil temperature up to 110 ° C), resulting in oxidation of stainless steel cold rolled coils.
The dew point of the protective gas is too high or the hydrogen content is too low, the pre-purging time before heating is insufficient, there is residual oxygen in the furnace, and the stainless steel cold-rolled coil is annealed in an oxidizing atmosphere.

Emulsion spot
Defect characteristics:
The surface of the annealed stainless steel cold-rolled sheet presents irregular or island-like black and brown patterns
cause:
1) The emulsion at the exit of the rolling mill is not fully filled, and it is carbonized during heating to form spots
2) The pressure of the air blower at the outlet of the last rack is low and the blowing is not clean.
3) The fan is not turned on when the belt is threaded, and the fan is turned off when the tail is flicked.
4) After the furnace is installed, the pre-purging time is insufficient, and the emulsified liquid is carbonized to form spots during heating.

Scratch
Defect characteristics:
The surface of the stainless steel cold-rolled plate presents straight and thin grooves of different depths. Parallel to the rolling direction, continuous or intermittent, varying in density and irregular, the scratches are smooth before leveling, the frontal color of the grooves is gray-black, after leveling, scratches, burrs, and metallic bright color.
cause:
1) There are sharp edges and corners or hard objects in the parts of the pickling, rolling, leveling and finishing units that are in contact with the stainless steel cold-rolled plate, resulting in relative motion.
2) Various rollers (pinch rollers, pinch rollers, guide plates, etc.) of the finishing line do not run and cause scratches.
3) When uncoiling or coiling, the speed of the stainless steel cold-rolled plate changes or the relative movement between layers.

To wrinkle
Defect characteristics:
The surface of the stainless steel cold-rolled plate presents uneven wrinkles, which mostly occur in the stainless steel cold-rolled plate less than 0.8mm.
cause:
1) The stainless steel cold-rolled sheet deviates, one side is stretched, and the other side is wrinkled.
2) The shape of the plate is bad, with large side waves or middle waves. When the stainless steel cold-rolled plate passes through the tempering machine, straightening machine or pinch roll, there will be wrinkles in the wave shape.
3) Improper adjustment of the straightening machine, resulting in uneven deformation.

Roll printing
Defect characteristics:
Periodic pits or convex hulls appear on the surface of the stainless steel cold-rolled sheet, and severe roll marks cause the stainless steel cold-rolled sheet to roll through.
cause:
1) The welding seam of the stainless steel cold-rolled plate is too high or the cleaning is uneven, causing sticking to the roll during continuous rolling
2) There are hard metal objects (welding beads, metal shavings, etc.) or dirt on the rollers. When rolling or leveling, hard objects or dirt are pressed on the surface of the stainless steel cold-rolled plate, leaving indentations.
3) Work rolls lose meat.

Embossed
Defect characteristics:
The pits of a certain depth on the surface of the stainless steel cold-rolled plate are imprints, which are periodic and vary in number, and the color of the defect is brighter.
cause:
1) Various auxiliary rollers (tension rollers, pinch rollers, nip rollers, straightening rollers, etc.) in the production process are caused by iron filings and dirt.
2) Iron filings and foreign matter fall into the stack of stainless steel cold-rolled plates.

Tower shape
Defect characteristics:
Defects in the shape of the steel coil, one circle of the end face of the stainless steel cold-rolled coil is higher (or lower) than the other circle, continuous, shaped like a pagoda, and mostly appear in the inner (outer) circle of the stainless steel cold-rolled coil
cause:
1) The centering device of the coiler fails, and the strip runs off
2) Stainless steel cold-rolled coils are not straight, such as sickle crescent, narrowing, etc.
3) The shape of the plate is poor, and there are large side waves, which make the stainless steel cold-rolled coil exceed the control limit of the photoelectric cell.
4) Improper operation and adjustment, the shrinkage of the reel is small, and when the pusher rolls out the stainless steel cold-rolled coil, the inner ring is pulled out.

Shandong Baowu Steel Group is mainly engaged in 304L stainless steel, 316L stainless steel, 317L stainless steel, 409L stainless steel, 436L stainless steel, 904L stainless steel, 301L stainless steel and other low-carbon stainless steel plates, stainless steel coils, stainless steel strips, stainless steel flat steel, and more than 1,000 tons of materials in stock , complete specifications and sufficient supply. At the same time, various stainless steel plate processing services can be provided according to customer requirements: flattening, slitting and drawing, mirror surface, oil grinding, polishing, punching, bending, leveling, slitting, cutting, rolling, punching, etc.

The thickness of the same batch of 304 stainless steel strips is inconsistent, why?- whatsapp: +8613256761911

China BaoWu Steel — Sun, 25 Jun 2023 06:21:50 +0000

The thickness of the same batch of 304 stainless steel strips is inconsistent, why?

Sometimes why there are inconsistent thicknesses between the same batch of 304 stainless steel strips? Today, Baowu Steel Group will tell you about the reasons for the inconsistent thickness of 304 stainless steel strips, hoping to clarify for you.

1. The influence of temperature change:

Once the temperature of metallurgical spare parts changes, it will affect the production conditions of the rolling equipment, thereby driving the thickness of the 304 stainless steel strip to change. The essence is that the temperature difference causes the thickness to fluctuate. The temperature fluctuation is mainly through the deformation resistance and friction factor of the stainless steel. This results in a change in the thickness between the stainless steel strips

2. Effect of tension change:

The tension will affect the stress state, and can change the metal deformation resistance of the 304 stainless steel strip, and further cause the thickness of the head and tail of the stainless steel strip to change. The change of tension will not only affect the thickness of the head and tail of the stainless steel strip, but also Affects the thickness of other parts of the stainless steel strip

Once the tension is too large, not only the thickness of the 304 stainless steel strip will be affected, but also the width of the stainless steel strip will be affected. Therefore, during the hot continuous rolling process, manufacturers often use loopers to stabilize the tension; Cold rolling is required during the rolling process because the stainless steel strip is hardened during processing, which increases the resistance to deformation.

If you just adjust the roll gap of the steel equipment to change the rolling force, it is very accurate to obtain a suitable reduction ratio, so it is necessary to use a relatively large inter-stand tension to determine the control. In cold rolling production, large tension is necessary .
By reducing the rolling force, the energy consumption of rolling can be reduced, thereby avoiding deviation of the stainless steel strip, and the thickness and deformation of the 304 stainless steel strip can be well controlled.

3. The effect of speed change:
The so-called speed mainly refers to changing the rolling pressure and reduction through the adjustment of the friction factor, deformation resistance and bearing oil film thickness, thereby changing the thickness of the 304 stainless steel strip.

4. The influence of roll gap change:
During the rolling process of stainless steel strip, because the rolls and bearings of the rolling mill components are affected by factors such as thermal expansion, roll gap wear, and roll eccentricity, the roll gap of the rolling equipment will produce high-frequency periodic thickness during high-speed rolling. Fluctuation directly affects the thickness of the 304 stainless steel strip.

In addition to the above reasons, the fluctuation of the thickness and mechanical properties of the incoming material is also caused by the change of the rolling pressure to cause the thickness of the stainless steel strip to be inconsistent. In addition, the rolling equipment setting calculation deviation, the accuracy of the measuring instrument and The design of control system structure and control parameters will also affect the thickness accuracy of 304 stainless steel strip.

Note: The content of this article is compiled from the Internet and is for reference only. If you want to know more frequently asked questions about stainless steel, please continue to pay attention to Shandong Baowu Steel Group. Of course, you can call 13256761911 to find us to purchase stainless steel raw materials. Shandong Baowu Steel Group not only has complete material specifications, strict quality control, smooth procurement channels, and excellent prices, but also provides customized processing services. You only need to provide material specifications and processing requirements, and we will make a detailed quotation for you. It doesn’t matter if you don’t know much about it. You can tell us your scope of use and requirements, and we will provide you with suitable steel and quotations. Welcome Call for consultation!

Shandong Baowu Steel Group is mainly engaged in 304 stainless steel, 304L stainless steel, 316L stainless steel, 317 stainless steel, 409L stainless steel, 436L stainless steel, 904L stainless steel, 301L stainless steel and other stainless steel plates, stainless steel coils, stainless steel strips, stainless steel flat steel, and more than 1,000 standing stocks Tons of materials, complete specifications, sufficient supply. At the same time, various stainless steel processing services can be provided according to customer requirements: flattening, slitting and drawing, mirror surface, oil grinding, polishing, punching, bending, leveling, slitting, cutting, rolling, punching, etc.

Has anyone told you what are the specific grades of low carbon stainless steel?- whatsapp: +8613256761911

China BaoWu Steel — Tue, 20 Jun 2023 08:25:44 +0000

Has anyone told you what are the specific grades of ultra-low carbon stainless steel?

What is ultra-low carbon stainless steel? Stainless steel plate manufacturer Shandong Baowu Steel Group tells you that ultra-low carbon stainless steel refers to austenitic stainless steel with a carbon content of less than 0.03% or ferritic stainless steel with a carbon content of less than 0.01%. corrosion susceptibility.

Has anyone told you what are the specific grades of ultra-low carbon stainless steel?

301L stainless steel
304L stainless steel
316L stainless steel
904L stainless steel
317L stainless steel
SUH409L stainless steel
SUS410L stainless steel
SUS436L stainless steel
SUS430J1L stainless steel

The above materials are specific grades of ultra-low carbon stainless steel. Please see the following for their characteristics and uses:

301L stainless steel (022Cr17Ni7), which is an ultra-low carbon steel of 301 stainless steel (12Cr17Ni7), has good intergranular corrosion resistance and weldability, and is used for railway vehicles.
304L stainless steel (022Cr19Ni10), steel with lower carbon content than 304 stainless steel (06Cr19Ni10), has superior resistance to intergranular corrosion, and does not undergo heat treatment after welding.
316L stainless steel (022Cr17Ni12M2), which is an ultra-low carbon steel of 316 stainless steel (0Cr17Ni12Mo2). Ultra-low carbon austenitic stainless steel has good corrosion resistance to various inorganic acids, alkalis, and salts (such as sulfuric acid, sulfuric acid, phosphoric acid, acetic acid, formic acid, chloride salts, halogens, sulfites, etc.). Due to the low carbon content, the coal joint performance is good, suitable for multi-layer welding, generally no heat treatment is required after coal, and there is no tendency of knife-edge corrosion after welding. It can be used in the manufacture of industrial equipment such as synthetic fibers, petrochemicals, textiles, fertilizers, printing and dyeing, and atomic energy, such as towers, tanks, containers, and pipelines.
904L stainless steel (015Cr21N26Mo5Cu2), high Mo stainless steel, fully resistant to sulfuric acid, phosphoric acid, acetic acid and other corrosion, and can solve the problems of chloride pitting corrosion, crevice corrosion and stress corrosion. It is mainly used for towers, tanks, tubes, heat exchangers, etc. in petrochemical, chemical, fertilizer, and ocean development.
317L stainless steel (022Cr19Ni13Mo3), which is an ultra-low carbon steel of 317 stainless steel (06Cr19Ni13Mo3), has better resistance to intergranular corrosion than 317 stainless steel (06Cr19Ni13Mo3), and is mainly used for condenser tubes in power stations.
SUH409L stainless steel (022Cr11Ti), ultra-low carbon steel, good welding performance, used for automotive exhaust treatment devices.
SUS410L stainless steel (022Cr12), good bending performance and processability of welding parts. It is mostly used in the container industry.
SUS436L stainless steel (019Cr18MoTi), adding Mo to the steel to improve the pitting corrosion resistance, crevice corrosion resistance and strength of the steel.
SUS430J1L stainless steel (019Cr18CuNb), ultra-low C, N control, added Nb, Cu, is a medium Cr ultra-pure ferritic stainless steel, with excellent surface quality and cold forming performance, used for exterior decoration parts of automobiles and buildings , home appliances, etc.

Note: The characteristics and uses of ultra-low carbon stainless steel such as 301L, 304L, 316L, 904L, 317L, SUH409L, SUS410L, SUS430J1L are all derived from the national standard “GB/TSUS436L, 3280-2015 Stainless Steel Cold-rolled Steel Sheet and Strip”, stainless steel plate Organized by the manufacturer Shandong Baowu Steel Group

If you want to know more frequently asked questions about stainless steel, please continue to pay attention to Shandong Baowu Steel Group. Of course, you can also call 13256761911 to find us to purchase stainless steel raw materials. Shandong Baowu Steel Group not only has complete material specifications, strict quality control, smooth procurement channels, and preferential prices, but also provides customized processing services. You only need to provide material specifications and processing requirements, and we will make a detailed quotation for you. It doesn’t matter if you don’t know much about it. You can tell your application and requirements, and we will provide you with suitable steel and quotations. Welcome You call for consultation!
Shandong Baowu Steel Group has 20 years of production experience, excellent geographical location and convenient transportation. It is a comprehensive enterprise mainly engaged in the wholesale of stainless steel raw materials, integrating trade, processing, warehousing and transportation. Shandong Baowu Steel Group is mainly engaged in 304 stainless steel, 304L stainless steel, 316L stainless steel, 317L stainless steel, 409L stainless steel, 436L stainless steel, 904L stainless steel, 301L stainless steel and other stainless steel plates, stainless steel coils, stainless steel strips, stainless steel flat steel, and more than 1,000 tons of materials in stock , complete specifications and sufficient supply. At the same time, various stainless steel processing services can be provided according to customer requirements: flattening, slitting and drawing, mirror surface, oil grinding, polishing, punching, bending, leveling, slitting, cutting, rolling, punching, etc.

The Role of 2205 Duplex Stainless Steel in Offshore Applications- whatsapp: +8613256761911

China BaoWu Steel — Sat, 17 Jun 2023 06:14:00 +0000

The Role of 2205 Duplex Stainless Steel in Offshore Applications

Baowu Steel Group, a manufacturer of 2205 duplex stainless steel, will share with you an article in a stainless steel journal today.

Abstract: Stainless steel, including duplex stainless steel and super duplex stainless steel, brings significant economic benefits to the offshore oil and gas industry. Compared with other materials, it is lighter, stronger, more resistant to corrosion, and lower life cycle cost.

Offshore projects are extremely important to the production and processing of hydrocarbons worldwide. In some of the most extreme environments, offshore extraction accounts for nearly 30 percent of global crude oil production. However, the saline-alkali marine environment requires offshore platforms to have high safety and life standards. The infrastructure for marine and offshore applications is often susceptible to a large amount of air and water-borne salt. Ordinary carbon steel structures are often subject to erosion, requiring Carry out regular maintenance and maintenance.

Stainless steel, on the other hand, is a solid guarantee of robust material choice for heavy offshore installations. The metal’s inherent corrosion properties provide infrastructure with a high strength-to-weight ratio, even in marine and coastal environmental conditions. Stainless steel also ensures a long design life and impressive resistance to extreme pressure and high temperatures. Remarkably, by using stainless steel, the expected service life of offshore structures can be increased by almost five times compared to its competitors.

Life cycle cost

In addition to a longer service life, due to the increasing emphasis on lowest life cycle cost (LCC) in building and construction, stainless steel is more qualified for offshore applications. This concept underscores the strong need to develop new types of infrastructure that are highly durable and do not require extensive maintenance or repair.
Weight reduction is also a major driving force behind the installation of offshore structures. The reduced weight means the structure is less expensive to build, while allowing for the addition of drill pipe and production equipment for oil and gas production and exploration.

Types of steel used in offshore installations

SS316L stainless steel is the main austenitic stainless steel grade used in offshore installations, it can enhance the strength at high temperature, and also protect the structure from the attack of severe acid environment. Austenitic stainless steel grades containing 6% molybdenum are usually used in environments that are permanently soaked in seawater. However, duplex stainless steels have widely replaced austenitic grades due to fluctuating global nickel prices over the past few years. Duplex stainless steels offer an excellent combination of mechanical properties and resistance to stress corrosion cracking, making them ideal for offshore applications. UNS S32205 stainless steel is the most commonly used duplex stainless steel for offshore installations.

Although duplex stainless steels are outstanding in heavy-duty offshore installations, the new generation of super duplex stainless steels is comparable to austenitic stainless steels in seawater corrosion resistance. In addition, the mechanical properties of these steel grades are significantly improved compared to duplex steels. These super duplex steels are characterized by higher contents of Nitrogen, Nitrogen, Ni, and Nickel, which contribute to their resistance to pitting and crevice corrosion. Example UNS S32750 and UNS S32760 steel grades for underwater components of more aggressive offshore installations.

Although duplex stainless steels are outstanding in offshore heavy installations, the new generation super duplex stainless steels are comparable to austenitic stainless steels in seawater corrosion resistance. In addition, the mechanical properties of these steel grades are significantly improved compared to duplex steels. These super duplex steels feature higher nitrogen, chromium, molybdenum, and nickel contents, which contribute to their resistance to pitting and crevice corrosion. Such as UNS S32750 and UNS S32760, which are used for underwater components of more aggressive offshore installations.

While we note that stainless steel is a better substitute for carbon steel, the key is to understand that selecting the best stainless steel grade for a particular need is critical to the cost-effectiveness and durability of offshore installations. As the largest stainless steel producer in China, Baowu Steel Group has a dedicated research and development institution, focusing on the production of high-end steel grades, and occupies a major share in the consumption of all similar products in China

Applications of stainless steel at sea

Subsea components: pipes and grilles for oil transfer, sewage and drainage, risers for oil transfer platforms, heat exchangers for ships and coastal power plants, equipment installed on the hull.

Platform structural components: pumps, winches, storage tanks, process vessels, blast doors, umbilicals, steel bars, cable trays, stairs, treads, walkways, gas coolers, gravity separators, etc.

Ship deck components, such as ship deck eyelets, anchor cable brackets, shackles, etc.
Coast (on land) Handrails, ladders, lampposts, etc.

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The Role of 2205 Duplex Stainless Steel in Offshore Applications- whatsapp: +8613256761911

The Role of 2205 Duplex Stainless Steel in Offshore Applications

Duplex stainless steel 2205 welding process and precautions- whatsapp: +8613256761911