Heat Treatment, Furnaces & Thermal Processing calculator
Heat Treat Rework Rate Calculator
Count each part requiring rework once, even if it repeats a furnace cycle. Compare that count with the same processed population and your rework limit.
What this calculator does
- Measure the share of heat treated parts requiring corrective processing against your maximum rework rate.
Formula used
- Rework rate = unique reworked parts ÷ unique processed parts × 100
- Rework margin = maximum rework rate − observed rework rate
- Parts without rework = unique processed parts − unique reworked parts
Inputs explained
- Parts Reworked: Unique parts receiving corrective heat treatment in the matched lot.
- Total Parts Heat Treated: Unique parts initially processed in the same lot.
- Maximum Rework Rate: Your permitted share of parts requiring corrective processing.
How to use the result
- Best suited to corrective treatment review, rework limit tracking.
- This rate does not measure repeat cycles, scrap or final acceptance.
Current U.S. benchmarks
- Industrial electricity averages 9.77 cents per kWh across the U.S. (EIA, Jul 2026), up 4.7% from a year earlier. Energy-intensive steps carry this directly into unit cost.
Common questions
- What if one part is reworked twice? Count it once in the reworked population. Track the two repeat cycles separately for time and cost.
- Are scrapped parts automatically rework? No. Count a scrapped part as reworked only if it actually received corrective processing.
- Does zero rework mean every part passed? No. The population can include scrap and pending inspection without recorded rework.
- Why is the margin negative? The observed rework rate exceeds your entered maximum by the magnitude of the negative margin.
Last reviewed 2026-10-06.