D3 Steel Round Bar

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Annealing: 800 to 850 degrees C in the furnace at 10 to 20 C / hourly speed of slow cooling control, 600 degrees, further cooling in the air. After annealing, the hardness is the highest 250 HB, and the pressure is reduced: 650-700 C is slowly cooled in the furnace, aiming at relieving the pressure and complex shape caused by extensive machining. After heating, put it in the neutral atmosphere for 1 to 2 hours. Hardening: 980 to 1010 centigrade oil, salt bath (220-250 C or 500-550 C), air, gas. Tools of complex shapes or sharp edges are best hardened in air or salt bath. Keep the time after the temperature balance: 15 to 30 minutes. The obtained hardness: 63-65 HRC. Tempering: immediately heated to the tempering temperature immediately after the quenching / 1 hours per 20 millimeters of the workpiece thickness in the furnace, but at least 2 hours / air cooling. To get the average hardness, please refer to the temper chart. In some cases, we recommend reducing the tempering temperature and increasing the heat preservation time.