METHOD FOR PRODUCING LOW-CARBON MARTENSITIC STEEL Russian patent published in 2021 - IPC C21D1/78 C22C38/58 C21D8/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy, namely, to production of workpieces from low-carbon martensitic steel containing 0.12 to 0.27% wt. of carbon. A workpiece is smelted from steel including 0.1 to 0.5% wt. silicon, 1.8 to 2.6% wt. manganese, 2.1 to 2.8% wt. chromium, 1.0 to 1.6% wt. nickel, up to 0.15% wt. vanadium and up to 0.15% wt. niobium as components. Rolling heating of the workpiece, subsequent double quenching and tempering thereof are executed. Full quenching is executed as the first quenching after rolling heating from a temperature of 950°C, medium- or high-temperature tempering is executed after the first quenching, and the second quenching is executed from the intercritical temperature range of 800 to 810°C.

EFFECT: mechanical properties of low-carbon martensitic steel are increased with the ensured high cold resistance thereof.

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