2. Isothermal annealing: 790-8 10 degree heating, 7 10-720 degree isothermal, air cooling -HB 207-229.
3. Normalization: 900-920 degrees heating and air cooling -HB 270-390.
4. High temperature tempering: heating at 650-700 degrees and air cooling -HB 229-285.
5. Quenching: 860 degree heating and oil quenching -HRC 62-66
6. Low temperature tempering: 150- 170 degree tempering, air cooling -HRC 6 1-66.
7. Carbonitriding: 820-830 * *1.5-3 hours, oil quenching, cryogenic treatment at -60 -70+150+160 tempering, air cooling-HRC&; Asymptomatic; 67