 7304511090 
冷轧的其他合金钢无缝锅炉管
Boiler tubes and pipes, of other alloy steel (cold-drawn or cold-rolled, including internal thread) |
7304511001
高温承压用合金钢无缝钢管（抗拉强度≥620MPa、屈服强度≥440MPa）
Alloy steel seamless steel tubes for pressure and high temperature (tensile strength, yield strength ≥ 620MPa ≥ 440MPa ≥ 127mm) (boiler tube, the chemical composition (wt%) 0.07 ≤ C ≤ 0.13, 8.5 ≤ Cr ≤ 9.5, 0.3 ≤ Mo ≤ 0.6, 1.5 ≤ W ≤ 2, cold drawn or cold r |
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