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Heat Treatment of H13 hot work tool steel

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Does anybody have an idea about the heat treatment cycle of H13? I need to know;
1- Optimal cooling rate for the Die with dimensions of 400*400*400 mm
2- Exact annealing and tempering times and temperatures


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Harden from 1800°F - 1890°F (982°C – 1032°C) in air. HRC 52


Heat at a rate not exceeding 400°F per hour (222°C per hour) to 1575-1625°F (857-885°C), and hold at temperature for 1 hour per inch of maximum thickness; 2 hours minimum. Then cool slowly with the furnace at a rate not exceeding 50°F per hour (28°C per hour) to 1000°F (538°C). Continue cooling to ambient temperature in the furnace or in air.


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