... bridge structures and railway bridges. 2.reasonable price 3.one of top 500 enterprise in china 4. steel base low alloy ... heavy steel plate variety series ClassificationRepresentative gradeStandard Large thickness of the structural steelQ345A(B,C,D,E)S355N,S355NLA572Gr42(50 ... , GL,LR,BV,ect, rules for classification and construction of ships Quality mold steelWSM718, P20,S50C,S48CJIS G4051:2005 Thick ...