alloy for djupborrhal and anvendning thereof to feed and swim for djupborrhal

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: 30-60% Cr: 15-35% -Mo: 0-12% W: 0-24% -Cr(%) + 10Mo(%) + 5W(%) /= 110% -7.5% /= Mo(%) + 1/2W(%) /= 12% -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. -