Foundry & Forging worked example

Heat Treat Load at 13% heat-treat handling allowance: a worked example in foundry & forging

This worked example runs the heat treat load numbers for a tougher week than the baseline: 13% heat-treat handling allowance instead of the typical 18%. Estimate heat-treat load time for castings, forgings, billets, or test coupons.

The inputs for this scenario

  • Heat-treat pieces or baskets: 12 loads (held at the documented default)
  • Heat-treat completion rate: 1.5 loads / hr (held at the documented default)
  • Heat-treat handling allowance: 13 % (the input this scenario stresses; the baseline uses 18)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base heat treat load = heat-treat pieces or baskets รท heat-treat completion rate.
  • Required heat treat load works out to 9.04 hr at these inputs, and this is the headline figure for the scenario.
  • Base heat treat load works out to 8 hr at these inputs.
  • Heat-treat handling allowance works out to 13 % at these inputs.
  • Heat-treat completion rate works out to 1.5 pieces / min at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where heat-treat handling allowance sits at 18% and the headline result is 9.44 hr, this scenario comes in 4.24% below the baseline at 9.04 hr.
  • Use it when scheduling furnace time, sequencing heat-treat jobs against a bottleneck, or quoting lead time for a batch. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Required heat treat load: 9.04 hr (headline result)
  • Base heat treat load: 8 hr
  • Heat-treat handling allowance: 13 %
  • Heat-treat completion rate: 1.5 pieces / min

Run it with your numbers

  • To rerun this with your own numbers, open the live Heat Treat Load calculator, set heat-treat handling allowance to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.