Dear All,
As per ASME section Ⅲ NX-4623,Above 800°F(425℃) the rate of heating and cooling in any hourly interval shall not exceed 400°F(222℃)divided by the maximum thickness in inches of the material being heat treated,but shall not exceed 400°F(222℃)and need not to be less than 100°F(56℃)in an hourly interval.
Now the actual heating and cooling rate in our production we made is 50℃/hour which is less than 56℃/hour required above. Our custom insist that this is unacceptable and should be reheated. But my understanding is that the 56℃ is not a mandatory requirement and only the upper limitation is required. Do I understand this correctly? PLZ guide me! Appreciate it！
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