What is the GB/T1591 Q355B steel?

GB/T1591 Q355B steel will replace GradeQ345B, and GB/T1591-2018 this standard replaces GB/T1591-2008 "low alloy high strength structural steel". With the development of modern industry, the continuous advancement of technology Q355B will replace Q345B. Q355 series steel is divided into five grades: Q355A, Q355B, Q355C, Q355B, Q335E, the main reason is that the impact temperature is different.

Q355B steel chemical composition:

C≤0.24, Si≤0.55, Mn≤1.6, P≤0.035, S≤0.035, Ni≤0.3; Cr≤0.3, N≤0.0012

Q355B plate application:

Q355B low alloy steel is widely used in engineering, mining machinery, bridges, vehicles, ships, construction, pressure vessels, special equipment, etc. The "Q" means yield strength, and 355 indicates that the yield strength of this steel is 355MPa.