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標準 牌號 化學成分 C Si Mn P S Cr Mo Cu Ni V ASTM A106 A ≤0.25 ≥0.10 0.27~0.93 ≤0.035 ≤0.035 ≤0.40 ≤0.15 ≤0.40 ≤0.40 ≤0.08 B ≤0.30 ≥0.10 0.29～1.06 ≤0.035 ≤0.035 ≤0.40 ≤0.15 ≤0.40 ≤0.40 ≤0.08 C ≤0.35 ≥0.10 0.29～1.06 ≤0.35 ≤0.35 ≤0.40 ≤0.15 ≤0.40 ≤0.40 ≤0.08
