What is the chemical composition of Q355 steel plate material?

Q355 steel plate is a kind of low-alloy high-strength structural steel, which is widely used in bridges, vehicles, ships, buildings, pressure vessels, special equipment, etc., where "Q" means yield strength, 355 means that the yield strength of this steel is 355MPa, and as the thickness of the material increases, its yield value decreases.

Q355 low-alloy high-strength structural steel chemical composition:
C: ≤0.24, Si: ≤0.55, Mn: ≤1.60, P: ≤0.035, S: ≤0.035, Cr: ≤0.30, Ni:≤0.30, Cu: ≤0.40.

Yield strength: ≤16mm:≥355, 16-40mm:≥345, 40-63mm:≥335, 63-80mm:≥315, 100-150mm:≥295, 150-200mm:≥285, 200--250mm:≥275; Tensile strength: 450-630.