FIELD: metallurgy.
SUBSTANCE: invention relates to steel for chains of mining equipment. Steel has a composition, wt.%: C: 0.20-0.28, Si: 0.01-0.40, Mn: 0.50-1.50, P≤ 0.015, S≤ 0.00,2 Cr: 0,30-2,00, Ni: 0.50-2.00, Mo: 0.10-0.80, Cu: 0.01-0.30, Al: 0.01-0.05, Nb: 0.001-0.10, V: 0.001-0.10, N≤0.00018, B≤0.0150, ≤0.0020, the rest is Fe and unavoidable impurities. The coefficient of microalloying elements rM/N, determined by the expression rM/N =([Al]/2+[Nb]/7+[V]/4)/[N], is 1.0-9.9.
EFFECT: steel has high strength and the required toughness, elongation and relative deformation and can also resist stress corrosion cracking and have suitable weather resistance, wear resistance and fatigue resistance.
9 cl, 2 dwg, 4 tbl, 7 ex
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