Stress Relieving
The Products requiring stress relieving are placed in the furnace the temperature shall be held between 575°C - 720°C (actual time/temperature to be specified PIB manufacturing procedure) for one hour per inch wall thickness (minimum one hour) and then cooled in still air.
Up to 9 contact thermocouples can be placed upon the components to monitor the exact temperature in different areas for components which vary in section which will be recorded on the load chart. The gas furnace atmosphere is slightly oxidising to prevent surface hardening caused by carbon pick up.
