FIELD: metallurgy, particularly, production of connection units for chains having diameter up to 50 mm and being used for mining. SUBSTANCE: construction alloyed steel comprises, mas.%: carbon, 0.22-0.28; manganese, 0.9-1.2; silicium, 0.15-0.35; chromium, 0.5-0.7; molybdenum, 0.7-0.9; nickel, 0.1-1.6; vanadium, 0.06-0.12; nitrogen, 0.002-0.012; ferrum, the balance. EFFECT: increased resistance of desired steel while in cross section up to 50 mm its plasticity and viscosity are retained. 2 tbl
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