2767 MOULD STEEL
|
STRESS
RELIEVING |
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| Heat to 650°C / 750°C. Hold for 2-4 hours and furnace cool. |
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HARDENING |
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| Before heat
treatment, sufficient machining should be carried out to remove surface decarburisation. Preheat thoroughly to 650°C / 700°C, and then raise more rapidly to 830°C / 850°C in a controlled atmosphere furnace or preferably, a neutral salt bath. Air cool or quench in oil, the latter being advised for large masses when maximum hardness is required. |