MASSIVE METALLURGICAL CUTTERS OF PEARLITE CLASS STEELS THERMAL TREATMENT METHOD Russian patent published in 1995 - IPC

FIELD: metals thermal treatment. SUBSTANCE: after homogenized annealing under temperature of 1050 1100 C for 4 7 hours with following cooling together with furnace to 300 C, then in the open air blanks are heated up to temperatures of austenitizing, kept for 3 4 hours and cool in open air. Then blanks are subjected to annealing under temperature of for 4 8 hours with cooling to 500 C with speed of 0.02 0.03 C/s in the open air, heated up to temperatures of austenitizing, kept, cooled in medium with temperature of M_s+ (5-50)^°C and hold under the temperature. Final cooling is exercised in water. EFFECT: method is used in metals thermal treatment. 1 dwg, 1 tbl