The Heat Treatment Hardness Change Calculator helps engineers, metallurgists, and manufacturing professionals estimate changes in steel hardness after heat treatment processes such as quenching, tempering, and annealing. By considering material properties, treatment temperature, holding time, and initial hardness, this tool supports heat treatment planning, hardness evaluation, and material performance optimization. Whether you’re working with carbon steel, alloy steel, or tool steel, this calculator provides a convenient way to estimate hardness variations and improve heat treatment decisions. Actual results may vary depending on steel composition, cooling conditions, and processing parameters.

Material & Starting Condition

Select the steel grade and enter the hardness you measured before heat treatment.

HRC valid range 20–68. Use HBW or HV for softer material.
Heat Treatment

Only the parameters that matter for the selected process are shown.

Heat treatment type
Thickness of the heaviest section, or diameter for round bar.