PIPE FROM STEEL RESISTANT TO CORROSION IN MEDIUM OF HYDROCARBON AND CARBON DIOXIDE Russian patent published in 2015 - IPC C22C38/54 C22C38/46 C22C38/32 C22C38/24 

FIELD: metallurgy.

SUBSTANCE: pipe is made from steel containing the following, wt %: carbon 0.21-0.28, silicone 0.15-0.45, manganese 0.50-0.95, chrome 0.80-1.30, molybdenum 0.25-0.45, nickel not more than 0.50, copper not more than 0.30, aluminium 0.015-0.050, sulphur not more than 0.010, phosphorus not more than 0.015, nitrogen not more than 0.012, vanadium 0.03-0.08 or boron 0.001-0.004 and titanium not more than 0.045, and iron and inevitable impurities are the rest.

EFFECT: achieving the required corrosion resistance of pipes in media containing hydrogen sulphide and carbon dioxide at provision of ultimate strength of not less than 655 MPa and yield point of 552 to 826 MPa.

2 cl, 3 tbl