FIELD: metallurgy.
SUBSTANCE: invention relates to metallurgy, particularly, to production of pipe sheet steel of strength class X80 used for production of bent pipes. Steel has the following chemical composition, wt. %: C: ≤ 0.10; Mn: 1.55–1.90; Si: ≤ 0.45; S: ≤ 0.001; P: ≤ 0.010; Nb: 0.045–0.08; Ti: ≤ 0.015; V: ≤ 0.008; Alt: ≤ 0.06; N: ≤ 0.0040; O: ≤0.004; Mo: ≤ 0.40; Cu: ≤ 0.30; Ni: 0.20–1.5; Cr: ≤ 0.35; Mo+Cu+Ni+Cr ≤ 1.5; Ceq: 0.35–0.53 %; Pcm: 0.17–0.27 %; balance are Fe and constant impurity elements.
EFFECT: steel has high mechanical properties and high impact viscosity at low temperatures.
4 cl, 2 dwg, 3 tbl
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