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+?W 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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机译：高强度高韧性合金钢及其制品技术领域本发明涉及一种高强度高韧性合金钢及其制品。钢以重量％计包含以下成分：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 + W 0.7-0.9，Cu 0.70-0.90，Co最高0.01 ，V +（5/9）×Nb 0.10-0.25，Ti高达0.005，Al高达0.015，Fe和混合物-其余。作为外加剂，钢所含的最大含量为0.01 wt％的硫和最多磷含量的0.001 wt％。效果：由在500°F下硬化和增强的钢制成的物品具有很高的强度和抗裂性.27 cl，2 tbl，1 ex
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