How do you calculate stress relief cost?

Multiply parts in the load by the rate per part and the capture percentage, then add the furnace and certification adder. For 120 parts at $3.40 each with 85% capture and a $400 adder you get 120 x 3.40 x 0.85 + 400 = $746.80 total.

What is the cost capture rate in stress relief?

It is the share of the per-part rate you actually charge, useful when stress relief piggybacks on a furnace cycle already running for another job. In the example, 85% capture reflects that the load shares furnace time, so only $346.80 of variable cost is charged before the fixed adder.

Why does stress relief cost less than hardening?

Stress relief soaks below the transformation temperature with no quench and no controlled atmosphere in many cases, so cycles are simpler and cheaper. The example works out to about $6.22 per part, far below typical hardening or case-hardening rates.

When should parts be stress relieved?

After heavy welding, rough machining of large parts, or cold forming, when residual stress would otherwise cause distortion during later machining or in service. It is common on large weldments, machine bases, and parts that must hold tight tolerance after finishing.

What is the furnace and cert adder for?

It covers fixed per-load costs that are not per-part: furnace setup and energy floor, fixturing, and any time-temperature chart certification the customer requires. In the example this is $400, which by itself is more than half the total on a modest load.

How do I get stress relief cost per part down?

Fill the load. Because the furnace and cert adder is fixed per cycle, adding more parts spreads it thin; running stress relief as a shared cycle behind another job, captured at a reduced rate, also lowers effective cost per part.

Heat Treatment, Furnaces & Thermal Processing calculator

Stress Relief Cost Calculator

Stress relief cost prices a sub-critical furnace cycle that soaks parts below the transformation temperature to relax residual stress from welding, machining, or forming so they stay dimensionally stable in service. Fabricators, machine shops, and weldment manufacturers use it to quote stress relief on large weldments and to decide whether to send work out or run it in-house. Unlike hardening, stress relief does not change microstructure much, so its value is dimensional stability and crack prevention rather than hardness, and its cost is driven by furnace soak time and load size. Pricing it correctly matters because stress relief is often a low-margin add-on that can quietly absorb furnace capacity needed for higher-value hardening work.

What this calculator does

Estimate stress relief cost from load size, per-part stress relief rate, cost capture, and fixed furnace or certification adders.
A fabrication estimator prices a stress-relief cycle for weldments to remove residual stress before machining.
It multiplies parts in the load by a per-part rate and a capture percentage, then adds a furnace and certification adder to give total stress relief cost and cost per part.

Formula used

Total cost = parts in load x stress relief rate per part x cost capture% + furnace and cert adder
Cost per part = total cost / parts in load

Inputs explained

Parts in stress-relief load:
Stress relief rate per part:
Cost capture rate:
Furnace and cert adder:

How to use the result

Use it when quoting stress relief on weldments or machined parts, sizing a load to spread the furnace cycle, or comparing in-house cost against an outside heat treater.
The model spreads cost by part count, so it does not weight by part mass; a load of heavy weldments and a load of light brackets at the same count will not reflect their very different soak times and furnace loading.

Current U.S. benchmarks

Industrial electricity averages 8.66 cents per kWh across the U.S. (EIA, Apr 2026), up 5.5% from a year earlier. Energy-intensive steps carry this directly into unit cost.

Common questions

How do you calculate stress relief cost? Multiply parts in the load by the rate per part and the capture percentage, then add the furnace and certification adder. For 120 parts at $3.40 each with 85% capture and a $400 adder you get 120 x 3.40 x 0.85 + 400 = $746.80 total.
What is the cost capture rate in stress relief? It is the share of the per-part rate you actually charge, useful when stress relief piggybacks on a furnace cycle already running for another job. In the example, 85% capture reflects that the load shares furnace time, so only $346.80 of variable cost is charged before the fixed adder.
Why does stress relief cost less than hardening? Stress relief soaks below the transformation temperature with no quench and no controlled atmosphere in many cases, so cycles are simpler and cheaper. The example works out to about $6.22 per part, far below typical hardening or case-hardening rates.
When should parts be stress relieved? After heavy welding, rough machining of large parts, or cold forming, when residual stress would otherwise cause distortion during later machining or in service. It is common on large weldments, machine bases, and parts that must hold tight tolerance after finishing.
What is the furnace and cert adder for? It covers fixed per-load costs that are not per-part: furnace setup and energy floor, fixturing, and any time-temperature chart certification the customer requires. In the example this is $400, which by itself is more than half the total on a modest load.

Last reviewed 2026-05-12.