7304599001

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, non cold drawn or cold-rol