Steel plate ASTM A572 Grade 50, equivalent to national standard Q345B, Japanese standard SM490, European standard S355JR,ASTMA572-55 corresponds to the national standard is A572 G42,

ASTMA572-55 corresponds to the national standard is A572GR42, A572Gr60/65 steel plate belongs to the American standard high-strength low alloy niobium-vanadium structural steel plate. The grades are ASTMA572Gr60, Gr65, corresponding to the national standard Q420B, Q460C steel plate, the steel has a low carbon and low silicon, high strength, high toughness, through the control of trace elements.