Heat Treatment, Furnaces & Thermal Processing worked example

Batch Heat Treat Capacity at 63% furnace uptime: a worked example

Suppose furnace uptime falls to 63%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate good batch heat treat output per shift from parts per load, usable furnace cycles, uptime, and first-pass yield.

The inputs for this scenario

  • Parts per furnace load: 250 parts / load (held at the documented default)
  • Usable furnace loads: 6 loads / shift (held at the documented default)
  • Furnace uptime: 63 % (the input this scenario stresses; the baseline uses 88)
  • First-pass heat treat yield: 96 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Gross batch capacity = parts per furnace load × usable furnace loads.
  • Good batch heat treat capacity works out to 907 parts / shift at these inputs, and this is the headline figure for the scenario.
  • Gross batch capacity works out to 1,500 parts / shift at these inputs.
  • Furnace downtime loss works out to 555 parts / shift at these inputs.
  • Quality yield loss works out to 37.8 parts / shift at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where furnace uptime sits at 88% and the headline result is 1,267 parts / shift, this scenario comes in 28.41% below the baseline at 907 parts / shift.
  • It computes good parts-per-shift by multiplying load size and loads per shift, then derating for furnace uptime and first-pass yield. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Good batch heat treat capacity: 907 parts / shift (headline result)
  • Gross batch capacity: 1,500 parts / shift
  • Furnace downtime loss: 555 parts / shift
  • Quality yield loss: 37.8 parts / shift

Run it with your numbers

  • To rerun this with your own numbers, open the live Batch Heat Treat Capacity calculator, set furnace uptime to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.