| 摘要 |
An alloy useful for manufacturing high strength deep well casing, tubing and drill pipes for use in oil-well operations is disclosed. The alloy exhibits improved resistance to stress corrosion cracking in the H2S-CO2-Cl--environment, which comprises the following alloy composition: -C: </=0.1% Si: </=1.0% -Mn: </=2.0% P: </=0.030% -S: </=0.005% N: 0-0.30% -Ni: 25-60% Cr: 22.5-35% -Mo: 0-7.5% (excl.) W: 0-15% (excl.) -Cr (%) + 10Mo (%) + 5W (%) >/= 70% -3.5% </= Mo (%) + 1/2W (%) < 7.5% -Cu: 0-2.0% Co: 0-2.0% -Rare earths: 0-0.10% Y: 0-0.20% -Mg: 0-0.10% Ca: 0-0.10% - one or more of Nb, Ti, Ta, Zr and V in the total amount of 0.5-4.0%, if necessary, Fe and incidental impurities: balance. |
