高温承压用合金钢无缝钢管（抗拉强度≥620MPa、屈服强度≥440MPa）(外径在127mm以上（含127mm），化学成分（wt%）中碳（C）的含量≥0.07且≤0.13、铬（Cr）的含量≥8.5且≤9.5、钼（Mo）的含量≥0.3且≤0.6、钨（W）的含量≥1.5且≤2.0、抗拉强度≥620Mpa、屈服强度≥440Mpa)

Alloy steel seamless steel tubes for pressure and high temperature (≥ 620MPa, tensile strength, yield strength ≥ 440MPa) (chemical composition diameter ≥ 127mm, (wt%) 0.07 ≤ C ≤ 0.13, 8.5 ≤ Cr ≤ 9.5, 0.3 ≤ Mo ≤ 0.6, 1.5 ≤ W ≤ 2, cold drawn or cold rolled,