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分类

标准 级别
型钢: L, U, H, L, V, HEP, IPE…

GB11263,
GB/T 706,
JLSG3192,
EN10025,
DLN1025,
EN10034, A6/A6M

Q235B, SS400, S235JR,
Q345B, SS540, S355JR,
不锈钢…