1.A572Gr50 Steel and Q345 Steel DescriptionA572Gr50 steel is a kind of high-strength low-alloy columbium-vanadium structural steel. 8 to 300 mm A572Gr50 steel plates is widely used in engineering structures, such as construction steel structures, construction machinery, mining machinery, trucks, bridges, pressure vessels, etc., especially for better weldability And tough construction and engineering machinery parts.
A572Gr50 is a high strength low alloy niobium-vanadium structural steel plate
Executive standard: ASTM A572 / A 572 M5
Technical requirements: steel plates for flaw detection, Z15Z35 thickness direction performance requirements, high strength and toughness requirements.
Q345 is a steel material. It is (C <0.2%) and is widely used in buildings, bridges, vehicles, ships, pressure vessels, etc. Q stands for this material, the latter 345 refers to this material, around 345 MPa. And as the thickness of the material increases, its yield value decreases.
Q345 can be divided into Q345A, Q345B, Q345C, Q345D, Q345E according to grade. They represent mainly different temperatures of impact.
2.Difference between A572Gr50 Steel and Q345 Steel in Chemical Composition
Q345 Steel Chemical Composition (%):
Q345A: C≤0.20Si≤0.50, Mn ≤1.70, P≤0.035, S≤0.035;
Q345B: C≤0.20, Si≤0.50, Mn ≤1.70, P≤0.035, S≤0.035;
Q345C: C≤0.20, Si≤0.50, Mn ≤1.70, P≤0.030, S≤0.030, Al≥0.015;
Q345D: C≤0.18, Si≤0.50, Mn ≤1.70, P≤0.030, S≤0.025, Al≥0.015; Q345E: C≤0.18, Si≤0.50, Mn ≤1.70, P≤0.025, S≤0.020, Al≥ 0.015;
Q345A, B, C, D, E all contain Nb≤0.07, V≤0.15, Ti≤0.20, Cr≤0.30, Ni≤0.50, Cu≤0.30, N≤0.012, Mo≤0.10.
Q345 Steel Chemical Composition (%):
C≤0.23, Mn≤1.35 P≤0.04 S≤0.05Nb 0.005 ~ 0.05
For steel plates with a thickness of less than 1.5in (40mm) Si≤0.40; for steel plates with a thickness of more than 1.5in (40mm) d≤0.15 ~ 0.40.
3.Difference between A572Gr50 Steel and Q345 Steel in Mechanical Properties
Q345 plate mechanical properties:
Yield strength σs (MPa) A ~ E ≥345
Tensile strength Rm / MPa A ~ E 470 ~ 630
Elongation after breaking A /% A / B ≥20 C / D / E ≥21
Impact work Akv / J (Nominal thickness 12mm ~ 150mm) ≥34
Mechanical properties of A572Gr50 Steel:
Yield strength σs (MPa) ≥345
Tensile strength Rm / MPa ≥450
Minimum elongation A /% (200mm gauge): 18
Minimum elongation A /% (50mm gauge): 21
Impact work Akv / J ≥34
4.Difference between A572Gr50 Steel and Q345 Steel in Application
A572Gr50 steel plate is an American standard low alloy plate, equivalent to the Chinese grade Q345. A572Gr50 plates are generally used in construction and various engineering machinery, such as drilling rigs, power shovel, electric wheel dump trucks, mining trucks, excavators, loaders, bulldozers, various cranes, coal mine hydraulic supports and other machinery Equipment and other structural parts.
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