q235d钢板Q235是碳素结构钢，根据国标（GB/T221-2000）规定，235为其屈服强度，即235MPa化学成分Q235分A、B、C、D四级(GB700-88)Q235***含C0.14~0.22%Mn0.30~0.65Si≤0.30S≤0.050P≤0.045Q235B级含C0.12~0.20%Mn0.30~0.670Si≤0.30S≤0.045P≤0.045Q235C级含C≤0.18%Mn0.35~0.80Si≤0.30S≤0.040P≤0.040Q235D级含C≤0.17%Mn0.35~0.80Si≤0.35S≤0.040P≤0.035密度：7.85)