Hydrogen-induced cracking and sulphide stress cracking...

Details Hydrogen-induced cracking and sulphide stress cracking... Hydrogen-induced cracking and sulphide stress cracking...

C - Chemistry, Metallurgy

22

C

C22C 38/16 (2006.01) C22C 38/00 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01) C22C 38/12 (2006.01) C22C 38/22 (2006.01) E21B 17/00 (2006.01) C21D 1/18 (2006.01) C21D 9/08 (2006.01)

Patent

CA 2414822

The invention relates to a quench-and-temper steel alloy for use in casing for oil and gas wells wherein such casing is exposed to low pH environments. The steel alloy has a carbon range by weight of 0.15% to 0.35%, a manganese range by weight of 0.60% to 1.10%, a molybdenum range by weight of 0.15% to 0.65%, and a sulphur range by weight of less than 0.002%. The steel alloy has a quench-and-temper micro- structure and features precipitated spheroidal molybdenum carbides in manganese- and carbon- rich bands. The steel alloy also has, by weight, a chromium range of less than 0.50%, an aluminum range of less than or equal to 0.08% and a calcium range of less than or equal to 0.0045%.

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