Every heat-treated batch leaves our furnaces with a chart: temperature against time, one line per thermocouple. It is the only record of what the parts actually saw.
Three things to check
- The soak starts when the slowest thermocouple reaches temperature, not the furnace setpoint
- Soak time matches the section thickness on the drawing
- The cooling rate matches the procedure: quench, air or furnace cool
Our furnaces are surveyed to AMS 2750, so the thermocouples on the chart are themselves checked against a reference every quarter.
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