16Mn的化學成分 C :0.13~0.19 Si :0.20~0.60 Mn :1.20~1.60 Mo:— Cr≤0.30 V:— Nb:— P≤0.030 S≤0.020 Ni≤0.30 Cu≤0.25 Q235的化學成分(%) C 0.14~0.22 Si 0.12~0.30 Mn 0.30~0.65 P ≤0.045 S ≤0.050Q235分A、B、C、D四級(GB700-88) Q235A級含C0.14~0.22% Mn0.30~0.65Si≤0.30S≤0.050P≤0.045 Q235B級含C0.12~0.20% Mn0.30~0.670Si≤0.30S≤0.045P≤0.045 Q235C級含C≤0.18% Mn0.35~0.80Si≤0.30S≤0.040P≤0.040 Q235D級含C≤0.17% Mn0.35~0.80Si≤0.35S≤0.040P≤0.035
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