High Carbon NM400 material meaning China Supplier

A572-50 steel I-beam is widely used in construction and architectural applications because it can provide more strength unit weight. The low content of niobium, vanadium and other alloy elements optimize its strength and atmospheric corrosion performance. Because of its high strength of 50000 Ksi yield strength, NM400 material meaning a572-50 steel I-section steel is more and more replacing ordinary carbon steel beams such as A36, and A36 section steel needs to be thickened to meet the strength requirements. NM400 material meaning ASTM 572 steel I can be used in other grades, such as 42, 55 and 60.

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Since the welding process is often used in the fabrication and processing of steel structures, it is very important for low-alloy high-strength steels of such purpose to be welded using the arc welding process that is widely used in thin thickness plates and steel strips. Yes, the welding seam of the steel structure should have the required strength and toughness, so as to withstand the most unfavorable conditions for the intended use. At present, the development of NM400 material meaning, low-alloy high-strength steels is carried out simultaneously with the development of various welding processes. Most low-alloy high-strength steels can be welded well.

The microstructure of the quenched and tempered alloy steel, NM400 material meaning after conventional heat treatment is tempered sorbite. For parts with wear-resistant surface (such as gears and spindles), induction heating surface quenching and low-temperature tempering are carried out, and the surface structure is tempered martensite. The surface hardness can reach 55HRC-58HRC. After quenching and tempering, the yield strength of quenched and tempered alloy steel is about 800MPa, the impact toughness is 800kJ / m2, and the core hardness is 22HRC - 25HRC. If the cross-section size is large but not quenched, the properties will be significantly reduced.

After the order is finished, our after-sales service center will send an email to make a feedback about our steel products' quality. We have phone service every three months to remind our customers of the possible problems and collect advices or suggestions in quality and service. Upon the collection of advices or suggestions, our after-sales service will quickly make technical solutions to wipe out the customer problem.