Heat Treatment, Furnaces & Thermal Processing worked example

Heat Treat Rework Rate at 1.44% target rework rate for the line: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop target rework rate for the line to 1.44%, then walk the calculation through step by step. Calculate rework rate for Heat Treatment, Furnaces & Thermal Processing: reworked parts as a share of total parts heat treated.

The inputs for this scenario

  • Parts reworked after heat treat: 35 units (held at the documented default)
  • Total parts heat treated in the batch: 1,000 units (held at the documented default)
  • Target rework rate for the line: 1.44 % (the input this scenario stresses; the baseline uses 2)

Working through the calculation

  • The calculation starts from the formula this tool documents: Rework rate = parts reworked ÷ total parts heat treated × 100.
  • Rework rate works out to 3.5 % at these inputs, and this is the headline figure for the scenario.
  • Gap to target works out to -2.06 points at these inputs.
  • Parts reworked works out to 35 count at these inputs.
  • Total parts heat treated works out to 1,000 count at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where target rework rate for the line sits at 2% and the headline result is 3.5 %, this scenario lands almost exactly on the baseline at 3.5 %.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to target rework rate for the line, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It counts reworkable parts only — outright scrap, parts re-run for traceability, and parts reworked for non-thermal reasons can distort the number if you do not define 'reworked' consistently.

Results at a glance

  • Rework rate: 3.5 % (headline result)
  • Gap to target: -2.06 points
  • Parts reworked: 35 count
  • Total parts heat treated: 1,000 count

Run it with your numbers

  • To rerun this with your own numbers, open the live Heat Treat Rework Rate calculator, set target rework rate for the line to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.