WQ690D, WH80Q high yield steel plate

The technical conditions apply to plates of WQ690D with thickness not more than 80mm. (8mm-80mm)

The dimension, shape, weight and permissible deviation shall meet the requirements of GB/T709
Thickness tolerance: +/-1.52mm
Flatness: 4mm/m
Surface shot blasting or peeled.
Technical conditions
Chemical composition (Ladle analysis)
The chemical composition of plates shall be accordance with the following table 1.
Steel making process: EAF+LF/VD
Carbon equivalent (CEq)
Carbon equivalent shall be not more than 0.60% for plates of WQ690D.
Carbon equivalent shall be calculated as follows:
CEq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 (%)

WQ690D Chemical composition (Ladle analysis)：

C	Si	Mn	P	S	Mo	Nb	B	Ni	Cr	Ti	V
≤0.16	≤0.50	≤1.60	≤0.020	≤0.010	≤0.60	≤0.07	≤0.003	≤1.20	≤0.80	≤0.03	≤0.08

WQ690D Mechanical properties：

Size mm	Rp0.2	Rm	A	Akv (longitudinal)		Bend
	MPa	MPa	%	℃	J
≤40	≥690	≥800	≥14	－20℃	≥34	d=3a
＞40-80	≥670