FIELD: metallurgy.
SUBSTANCE: invention relates to metallurgy, namely to low-alloy steel for oilfield gage pipes. Steel has chemical composition, containing, in wt%: C: from 0.56 to 1.00, Si: from 0.05 to 0.50, Mn: from 0.05 to 1.00, P: not exceeding 0.025, S: not exceeding 0.010, Al: from 0.005 to 0.100, Mo: from 0.40 to 1.00, V: from 0.07 to 0.30, O: not exceeding 0.010, N: not exceeding 0.03, rest is Fe and unavoidable impurities. Steel has yield point, making at least 862 MPa, and diffraction maximum width at half height for crystal lattice plane [211], obtained by x-ray diffraction measurement is not more than 0.50°.
EFFECT: steel has high mechanical properties and resistance to corrosion in sulphide containing environment.
22 cl, 4 dwg, 4 tbl, 2 ex
