比Q235更贵的钢,已知45号钢,锅炉钢20g答:(S)A204M(Gr.A.B.C)(S)A387M(Gr.11.12.22)(S)A537M(CL.1, CL.2)(S)A662M(Gr.A.B.C)(S)A302M(Gr.A.B.C.D)(S)A737M(Gr..B.C)(S)A738M(Gr.A.B.C)(S)A553M(l,ll)P23GH,P265GH,P295GH 10CrMo9-10, 11CrMo9-10 A42,A52,A48 20MnHR,20HR,19MnHR 161G...