METHOD OF DEFORMATION-THERMAL TREATMENT OF AUSTENITIC CORROSION-RESISTANT STEELS Russian patent published in 2018 - IPC C21D6/00 C21D8/00 

FIELD: metallurgy.

SUBSTANCE: blank is preliminary subjected to homogenization annealing followed by cooling at rate providing preservation of supersaturated solution of alloying elements in austenite, and then followed by intensive plastic deformation by twisting under high hydrostatic pressure in two stages. According to the first version, intensive plastic deformation is carried out at the first stage with gradual decrease of temperature from 723 K to 573 K with true degree of deformation from 4.5 to 7.5, and at the second stage cold plastic deformation at temperature up to 293 K with true degree of deformation 2.25 and higher is conducted. According to the second version at the first stage cold intensive plastic deformation is carried out by twisting at temperature up to 293 K with true degree of deformation not less than 3.5, and at the second stage warm plastic deformation at 723 K with true degree of deformation above 3.5 is conducted.

EFFECT: improved strength properties of steel at deformation temperatures below the recrystallization temperature while maintaining a homogeneous austenite structure.

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