Table 1.

Chemical composition of Q420D steel.

C	Mn	Si	P	S	V	Nb	Ti	Al	Cr	Ni
0.2	1.00–1.70	0.55	0.03	0.03	0.02–0.20	0.015–0.060	0.02–0.20	0.015	0.4	0.7