09MnNiD耐超低温钢管主要化学成分如下:C 0.06~0.12;Si 0.15~0.35;Mn 1.20~1.60;Cr ≤0.30;Ni 0.45~0.85;Cu≤0.25;Nb≤0.050;P≤0.020;S≤0.01