Method for heat-treating work pieces made of...

Metal treatment – Process of modifying or maintaining internal physical... – Carburizing or nitriding using externally supplied carbon or...

Reexamination Certificate

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C148S226000, C148S232000

Reexamination Certificate

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07108756

ABSTRACT:
A method of producing a workpiece of a heat-resistant steel, such as hot forming tool steel, where the workpiece may be hardened and depassivated after mechanical machining and electrochemical treatment. The hardening including a reduction step, so that no depassivation need be performed by pickling, for example, before nitriding. The result of the hardening treatment is a favorable surface condition for stepwise nitriding.

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Davis et al., The ASM Handbook, 1995, ASM International, vol. 4, 314-319, 387-388 and 711-725.

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