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Heat treat interpretation
4

Heat treat interpretation

Heat treat interpretation

(OP)
I have a part that requires the following treatment:

690 + 100 HV 10
Eht 550 HV 1 = 0.8mm + 0.4mm

What is the correct way to interpret the above?

RE: Heat treat interpretation

2
690 + 100 HV 10 means that the surface hardness must be between 690 and 790 when tested using a Vickers indenter and a 10 kg force.

Eht 550 HV 1 means that the part must be hardened to at least 550 HV 1 (Vickers indenter, 1 kg force) at a depth of 0.8 mm minimum and 1.2 mm maximum.  This is a designation from DIN 50190.

Regards,

Cory

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RE: Heat treat interpretation

2
Just to add one more detail, Eht means case hardening by carburizing, while Nht means nitriding and Rht means induction hardening.

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