D13 0.21~0.24 0.30-0.50 1.00~1.30 0.0012~0.002 0.38~0.46 D16~D19 0.22~0.26 0.35-0.55 1.00~1.30 0.0012~0.002 0.39~0.48 D22~D25 0.23~0.26 0.35-0.55 1.15~1.30 0.0012~0.002 0.42~0.48 1.2.2250 规格mm C% Si% Mn% B% Ceq% Φ16 0.19~0.23 0.30-0.50 0.40~0.60 0.0012~0.002 0.27~0.33 Φ...