Q345D steel plate expression method, Q345D steel plate is composed of three parts representing the yield strength, the value of the yield strength, and the quality grade symbol.
The chemical composition of Q345D steel plate:
C: ≤0.18; Si: ≤0.50; Mn: ≤1.70; P: ≤0.030; S: ≤0.025; Nb: ≤0.07; V: ≤0.15; Ti: ≤0.20; Cr: ≤0.30; ≤0.50; Cu: ≤0.30; N: ≤0.012; Mo: ≤0.10; Als: ≥0.015.
Mechanical properties of Q345D steel plate:
Yield strength: ≤16mm: ≥345; 16-40mm: ≥335; 40-63mm: ≥325; 63-80mm: ≥315; 80-100mm: ≥305; 100-150mm: ≥285; 150-200mm: ≥275 ; 200-250mm: ≥275; 250-400mm: ≥265.
Tensile strength: 450-630.
Elongation: ≥21.
Impact test: -20℃: ≥34.
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