METHOD FOR ROLLED STOCK THERMOMECHANICAL TREATMENT Russian patent published in 2008 - IPC C21D8/08 C21D1/02 

FIELD: metallurgy.

SUBSTANCE: method includes hot rolling by two stages with accumulated closing 60-77% of breakdown bar cross-section area at each stage with soaking 19-26 s after the first and 12-17 s after the second with precooling of breakdown bar till temperatures not less then Ar₃, definitive rolling in this range of temperatures, cyclic cooling of surface with quantity of cycles, equal to two, during time (0.017-0.020)D s in the first cycle and (0.05-0.06)D s in the second cycle with intermediary warm during 0.2-0.3 s and definitive warm of surface till temperatures which are lower then point Ac1 and definitive air cooling, where D - rolled iron diameter in mm.

EFFECT: increasing of plastic characteristics of fittings at saving of its strength characteristics.

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