... ,S45C,S50CGB/T711—1988JIS G4051 20053High strength low-alloy structuralsteelsQ295,Q345,Q390,Q420,Q640GB/T1591—19944Structural steels ... bridgesQ235q, Q345q,Q370q,Q420qGB/T714—20005Hot-rolled steel plates for plasticMouldsSM3Cr2Mo,SM3Cr3NiMoYB/T107—19976Hull structural steelsH 6~160W ... ,D32,E32,A36,D36,E36GB712—2009Rules of classificationsociety7Steel plates for boilersH 6~120W 1500~3600L 6000~1800020g, ...