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Materials / Related reference

Case hardening

Case hardening creates a hardened surface region with a different condition from the core. Specify the actual process. Carburising enriches the surface with carbon before hardening; carbonitriding introduces carbon and nitrogen. Gas nitriding is a different diffusion treatment and does not use the same subsequent quench-hardening route.

State check

Surface hardness, core requirements and case depth describe different acceptance checks. State the case-depth definition and test criterion instead of using an unexplained depth value.

Next step

Agree the treatment, finished dimensions and post-treatment machining allowance with the heat treater. This glossary does not prescribe universal growth or grinding allowance.

Carry the final condition into the material record

A process name does not supply a universal hardness, strength, temperature, dimensional allowance or cutting parameter.

Record the known material condition →Find a grade →

Sources and scope

Reviewed 23 October 2026. Process explanations and public standard summaries do not establish a treatment recipe or certify a supplied part.

Bodycote atmospheric carburising

Process definition and stated condition boundaries; public standard abstracts only where applicable.

Open source ↗
Bodycote carbonitriding

Process definition and stated condition boundaries; public standard abstracts only where applicable.

Open source ↗
Bodycote gas nitriding

Process definition and stated condition boundaries; public standard abstracts only where applicable.

Open source ↗