Metal treatment – Process of modifying or maintaining internal physical... – Carburizing or nitriding using externally supplied carbon or...
Reexamination Certificate
2006-09-19
2006-09-19
King, Roy (Department: 1742)
Metal treatment
Process of modifying or maintaining internal physical...
Carburizing or nitriding using externally supplied carbon or...
C148S226000, C148S232000
Reexamination Certificate
active
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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Lerche Wolfgang
Lippmann Nils
Alexander Michael P.
Kenyon & Kenyon LLP
King Roy
Robert & Bosch GmbH
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