What is the chemical composition of Q345D steel plate?

Q345D steel plate is a low-alloy steel plate, the implementation standard: GB/T1591-2008 "low-alloy high-strength structural steel". Q345D steel plate is compared with Q345A, B, C steel. The test temperature of low temperature impact energy is low (-20℃minimum 27J). Q345D steel plate has good mechanical properties. Contains harmful substances P and S are lower than Q345A, B, and C.

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;
Ni: ≤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.