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The advantages of SMA400AP SMA400BP SMA400CP steel, seamless steel pipe are high pressure resistance, good toughness, long pipe section and few joints. It is widely used and the rolling technology of domestic steel mills is also very mature. Compared with round steel, the weight of seamless steel pipe is lighter under the same strength. Seamless steel pipe manufacturing ring parts, can improve the utilization of materials, simplify the manufacturing process, save materials and processing time. Compared with the welded pipe, there is no weld on the outer surface of seamless steel pipe, and it has good compression resistance.
The sulfur element (S element) comes from the ore and fuel coke of steelmaking. It is a harmful element in SMA400AP SMA400BP SMA400CP steel etc. steel. Sulfur exists in steel in the form of iron sulfide (FeS). FeS and Fe form a low melting point (985℃) compound. The hot working temperature of steel is generally above 1150 - 1200℃, so when the steel is hot working, the premature melting of FeS compound causes the workpiece to crack, which is called "hot brittleness". It reduces ductility and toughness of steel and causes cracks during forging and rolling. Sulfur is also detrimental to welding performance and reduces corrosion resistance.
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Meaning of S355J2W: S is structural steel, 355 means the yield strength of 355MPa, J2 requires -20℃ impact, and the letter W indicates that the S355J2W steel has the ability to resist atmospheric corrosion. SMA400AP SMA400BP SMA400CP steel, S355J2W is a fine-grained steel, which is widely used for welding, bolting and riveting parts of high-speed rail bogies.