The effective hardening depth (surface hardness depth SHD) is the distance between the specimen surface and the point in the layer where the Vickers hardness is 0.8 times the minimum value of the surface hardness, see graph.

hardening depth (determined with a limiting hardness value of 550 HV) from the surface, a limiting hardness value greater than 550 HV, in steps of 25 units, can be selected for the determination of the case hardening depth by agreement between interested parties.

Note 1 to entry: For steels which present a hardness greater than 450 HV at a distance of three times the case hardening depth (determined with a limiting hardness value of 550 HV) from the surface, a limiting hardness value greater than 550 HV, in steps of 25 units, can be selected for the determination of the case hardening depth by agreement ...

The Vickers test is also the preferred method for measuring hardness depths. A distinction is primarily made between the depth of hardening after case hardening (CHD), after nitriding (NHD) and after induction hardening (SHD).

The CHD limit hardness value is defined as fixed hardness, typically at 550 HV. The chemical composition of the surface layer is not changed with surface hardening, in contrast to the case hardening. The aim is to achieve a fully martensitic structure at the surface region, typically after induction or laser hardening, while the core of the ...

Dec 15, 2015 · The hardness gradient of the EB-treated steel was described by hardness depth profiles (LECO M400, F = 0.4903 N, Vickers-shaped diamond indenter), and the surface hardening depth was determined according to DIN ISO 15787, with a hardness limit of 550 HV 0.05 (SHD 550 HV 0.05) for the steel 51CrV4.

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