c
化学成分: (wt%) 合 金 牌 号 C P S Mn Si Ni Cr Co Mo Cu Fe 不大于 1J76 0.03 0.020 0.020 0.30~0.60 0.15~0.30 75.0~76.5 1.80~2.20 — — 4.80~5.20 余 1J77 0.03 0.020 0.020 0.30~0.60 0.15~0.30 75.0~78.0 — — 3.90~4.50 4.80~6.00 余 1J79 0.03 0.020 0.020 0.60~1.10 0.30~0.50 78.5~80.0 — — 3.80~4.10 ≤0.20 余 1J80 0.03 0.020 0.020 0.60~1.10 1.10~1.50 79.0~81.5 2.60~3.00 — — ≤0.30 余 1J85 0.03 0.020 0.020 0.30~0.60 0.15~0.30 79.0~81.0 — — 4.80~5.20 ≤0.20 余 1J86 0.03 0.020 0.020 ≤1.00 ≤0.30 80.5~81.5 — — 5.80~6.20 — 余