HIGH CORROSION RESISTANCE PIPE Russian patent published in 2016 - IPC C22C38/18 C21D8/10 F16L9/02 

FIELD: metallurgy.

SUBSTANCE: invention relates to production of oil pipes. To increase corrosion resistance of metal pipes in media containing hydrogen sulphide (at partial pressure H₂S of up to 1.5 MPa) and carbon dioxide (at partial pressure of CO₂ of up to 0.1 MPa) both simultaneously and separately, and to provide ultimate strength not less than 655 MPa, yield point of 552 to 758 MPa and resistance to impact loads at minus 60 °C not less than 70 J/cm² pipes are made from steel containing, wt%: carbon 0.15-0.25, silicon 0.15-0.35, manganese 0.40-0.70, chrome 0.70-1.50, molybdenum 0.10-0.30, vanadium 0.03-0.08, aluminium 0.015-0.050, sulphur not more than 0.010, phosphorus not more than 0.015, nitrogen not more than 0.012, copper 0.15-0.35, nickel not more than 0.30 (or 0.30-0.70), iron and unavoidable impurities - balance.

EFFECT: high corrosion resistance of metal pipes.

2 cl, 4 tbl