FIELD: metallurgy.
SUBSTANCE: invention relates to high-strength high-ductile alloyed steel and articles made out of it. Steel contains the following component in wt %: C 0.30-0.47, Mn 0.8-1.3, Si 1.5-2.5, Cr 1.5-2.5, Ni 3.0-5.0, Mo+ЅW 0.7-0.9, Cu 0.70-0.90, Co up to 0.01, V+(5/9)×Nb 0.10-0.25, Ti up to 0.005, Al up to 0.015, Fe and admixtures - rest. As admixtures steel contains max. 0.01 wt % of sulphur and max. 0.001 wt % of phoshorus.
EFFECT: made out of steel hardened and reinforced at 500°F articles have high strength and crack-resistance.
27 cl, 2 tbl, 1 ex
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