标低温无缝管化学成分|美标低温管化学成分 美标低温无缝管化学成分 标准 牌号 化学成分（％） C Si Mn P S Cr Ni Cu Mo V Al ASTM A333 Grade 1 ≤0.30 0.40-1.06 ≤0.025 ≤0.025 Grade 3 ≤0.19 0.18-0.37 0.31-0.64 ≤0.025 ≤0.025 3.18-3.82 Grade 4 ≤0.12 0.18-0.37 0.50-1.05 ≤0.025 ≤0.025 0.44-1.01 0.47-0.98 0.40-0.75 0.04-0.30 Grade 6 ≤0.30 ≥0.10 0.29-1.06 ≤0.025 ≤0.025 Grade 7 ≤0.19 0.13-0.32 ≤0.90 ≤0.025 ≤0.025 2.03-2.57 Grade 8 ≤0.13 0.13-0.32 ≤0.90 ≤0.025 ≤0.025 8.40-9.60 Grade 9 ≤0.20 0.40-1.06 ≤0.025 ≤0.025 1.60-2.24 0.75-1.25 Grade 10 ≤0.20 0.10-0.35 1.15-1.50 ≤0.03 ≤0.015 ≤0.15 ≤0.25 ≤0.015 ≤0.50 ≤0.12 ≤0.06 Grade 11 ≤0.10 ≤0.35 ≤0.6 ≤0.025 ≤0.025 ≤0.50 35.0-37.0 ≤0.50
