PIPE STEEL Russian patent published in 2014 - IPC C22C38/58 C22C38/50 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, particularly, to steels for production of mainline pipes. Said steel contains the following substances, in wt %: carbon 0.11- less than 0.15, silicon - 0.40- less than 0.50, manganese - 1.30-1.60, chromium - over 0.30, nickel - 0.06-0.20, copper - not over 0.30, aluminium - no over 0.05, titanium - not over 0.03, nitrogen - not over 0.008, sulphur - not over 0.040, phosphorus - 0.015-0.030, iron making the rest. This steel features ferrite-perlite structure, temporary breaking strength σ_B not over 530 N/mm², impact viscosity KCU^-40 not over 120 J/cm².

EFFECT: better useful qualities.

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