Heat Treatment, Furnaces & Thermal Processing worked example

Carburizing Cycle Time at 14% carburizing cycle allowance: a worked example

This scenario runs the carburizing cycle time calculation on the strong side: 14% carburizing cycle allowance, with every other input held at its documented default. Use it when carburized gears, shafts, pins, or wear parts need a defensible furnace schedule before release.

The inputs for this scenario

  • Carburizing loads planned: 2 loads (unchanged)
  • Carburizing completion rate: 0.08 loads / hr (unchanged)
  • Carburizing cycle allowance: 14 % (raised for this scenario; the documented default is 12)

Working through the calculation

  • Applying the documented formula (Base carburizing hours = carburizing loads planned รท carburizing completion rate) to the inputs above produces each figure below.
  • At this operating point the engine returns 28.5 hr for required carburizing cycle time, the number this scenario is built around.
  • At this operating point the engine returns 25 hr for base carburizing hours.
  • At this operating point the engine returns 14 % for carburizing allowance applied.
  • At this operating point the engine returns 0.08 loads / hr for carburizing completion rate.

How this compares with the baseline

  • Against the tool's baseline example, where carburizing cycle allowance sits at 12% and the headline result is 28 hr, this scenario comes in 1.79% above the baseline at 28.5 hr.
  • Use it when scheduling case-hardening runs, sizing furnace capacity, or quoting heat treat lead time for carburized gears and shafts. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Required carburizing cycle time: 28.5 hr (headline result)
  • Base carburizing hours: 25 hr
  • Carburizing allowance applied: 14 %
  • Carburizing completion rate: 0.08 loads / hr

Run it with your numbers

  • Every input above is editable in the live Carburizing Cycle Time calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.