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Tempering should be
carried out immediately after proper completion of the quenching
operation. Heat to within the 560°C / 675°C range soaking for
two to three hours according to section. A second tempering cycle
of similar duration is strongly recommended and care should be taken to
ensure that the tools are allowed to cool to room temperature at least
50°C higher than that which the tools may be expected to achieve in
service. The curve given indicates typical hardness values
obtained on oil quenching from 1160°C and double
tempering.
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