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一 St37-3 A <4 0.04~0.13 ≤0.08 0.20~0.70 ≤0.035 ≤0.030 Alt≥0.01 St37-3 A 4~<7 0.04~0.13 ≤0.08 0.40~0.90 ≤0.035 ≤0.030 Alt≥0.01 般 St37-3 A 7~<13 0.04~0.13 ≤0.12 0.60~1.10 ≤0.035 ≤0.030 Alt≥0.01 St37-3 A 13~<18 0.08~0.17 ≤0.12 0.60~1.10 ≤0.035 ≤0.030 Alt≥0.01 结 St37-3 A 18~25.4 0.08~0.17 ≤0.12 0.80~1.30 ≤0.035 ≤0.030 Alt≥0.01 St44-2 A <5 0.08~0.17 ≤0.12 0.55~1.05 ≤0.035 ≤0.035 Alt≥0.01 构 St44-2 A 5~<18 0.08~0.17 ≤0.12 0.75~1.25 ≤0.035 ≤0.035 Alt≥0.01 St50-2 K <10 0.21~0.30 0.12~0.35 0.45~0.95 ≤0.035 ≤0.035 钢 St52-3 G <7 0.13~0.22 0.20~0.55 1.20~1.70 ≤0.035 ≤0.035 Alt≥0.01 St52-3 G 7~<18 0.13~0.22 0.20~0.55 1.10~1.60 ≤0.035 ≤0.035 Alt≥0.01 Nb≤0.04 St52-3 G 18~25.4 0.13~0.22 0.20~0.55 1.10~1.60 ≤0.030 ≤0.030 Alt≥0.01 Nb≤0.04 焊 SM400A G ≤6 0.05~0.14 0.10~0.35 0.50~1.00 ≤0.035 ≤0.035 SM400A G >6~16 0.12~0.21 0.04~0.30 0.45~0.95 ≤0.035 ≤0.035 接 SM400B G ≤6 0.05~0.14 0.10~0.35 0.50~1.00 ≤0.035 ≤0.035 SM400B G >6~12 0.12~0.21 0.04~0.30 0.45~0.95 ≤0.035 ≤0.035 结 SM400C G ≤6 0.12~0.21 0.04~0.30 0.25~0.75 ≤0.035 ≤0.035