METHOD FOR PRODUCING HOT-ROLLED VARNISHED ROLL WITH RESTRICTION OF CARBIDE GRID RESIDUES IN STRUCTURE OF HIGH-CARBON BEARING BRANDS OF STEEL FOR MANUFACTURE OF ROLLERS AND BEARING RINGS

摘要

FIELD: ferrous metallurgy, namely manufacture of rolled bars for making rollers and races of rolling bearing assemblies. ^ SUBSTANCE: method comprises steps of melting ball-bearing steel of given kind; casting it; heating ingot for rolling and subjecting it to accelerated after-deformation cooling in cooling apparatuses till temperature of self-tempering in range 690 -630°C. At such treatment eutectic carbide separation along grains boundaries in the form of residues of carbide net in hot rolled piece is no more than 3 marks of scale 4 of given technical standard. ^ EFFECT: shortened time period of spheroidizing annealing, lowered expenses for energy consumption at heat treatment. ^ 2 tbl