Foundry & Forging worked example

Forge Heating Time at 21% heating and transfer allowance: a worked example

What does the result look like when heating and transfer allowance reaches 21%? The full calculation is worked below with real intermediate numbers. Use it when furnace, induction heater, or billet heater capacity must match press schedule and forging temperature requirements.

The inputs for this scenario

  • Billets or forge loads to heat: 40 loads (unchanged)
  • Heating completion rate: 7 loads / hr (unchanged)
  • Heating and transfer allowance: 21 % (raised for this scenario; the documented default is 18)

Working through the calculation

  • Applying the documented formula (Base forge heating time = billets or forge loads to heat รท heating completion rate) to the inputs above produces each figure below.
  • At this operating point the engine returns 6.91 hr for required forge heating time, the number this scenario is built around.
  • At this operating point the engine returns 5.71 hr for base forge heating time.
  • At this operating point the engine returns 21 % for heating and transfer allowance.
  • At this operating point the engine returns 7 pieces / min for heating completion rate.

How this compares with the baseline

  • Against the tool's baseline example, where heating and transfer allowance sits at 18% and the headline result is 6.74 hr, this scenario comes in 2.54% above the baseline at 6.91 hr.
  • A figure at this level is achievable when heating and transfer allowance is genuinely sustained, not just peaked for a shift. The completion rate is treated as constant, but real furnaces heat slower when fully charged and faster when nearly empty, so verify the rate against your actual section thickness and steel grade.

Results at a glance

  • Required forge heating time: 6.91 hr (headline result)
  • Base forge heating time: 5.71 hr
  • Heating and transfer allowance: 21 %
  • Heating completion rate: 7 pieces / min

Run it with your numbers

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

Last reviewed 2026-05-12.