METHOD FOR THERMAL PROCESSING OF FORGED ROLLS FROM HYPEREUTECTOID STEEL Russian patent published in 2004 - IPC

FIELD: ferrous metallurgy, in particular, thermal processing of forged rolls for hot rolling mills.

SUBSTANCE: method involves providing austenization, cooling in air and tempering; heating forged piece in austenite zone to temperature of 1,030-1,050⁰C, 820-840⁰C, 910-930⁰C, with forged pieces being cooled in air after each heating cycle; providing intermediate holding at temperature of 490-510⁰C, followed by tempering at temperature of 530-550⁰C. Proposed thermal processing mode includes triple normalization cycles in austenite zone: first cycle at temperature A_st, second cycle at temperature A_c1 and third cycle at temperature approximating A_st value and tempering value. Method allows Brinell hardness in working layer of forged rolls to be increased to 320-360 HB.

EFFECT: improved operating characteristics of forged rolls owing to reduced point of carbide lattice and provision for producing of fine-dispersed structure.

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