Title:
METHOD FOR HEAT-TREATING WORK PIECES MADE OF TEMPERATURE-RESISTANT STEELS
Document Type and Number:
WIPO Patent Application WO2003027349
Kind Code:
A3
Abstract:
The invention relates to a method for heat-treating work pieces made of a temperature-resistant steel. According to the inventive method, the work piece, once mechanically machined and electrochemically treated, is hardened and depassivated. The hardening comprises a reduction step so that before nitration no depassivation such as for example by pickling is required, thereby producing in the hardening step a surface condition that is favorable for the step-wise nitration.
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Inventors:
LIPPMANN NILS (DE)
LERCHE WOLFGANG (DE)
LERCHE WOLFGANG (DE)
Application Number:
PCT/DE2002/003582
Publication Date:
December 04, 2003
Filing Date:
September 24, 2002
Export Citation:
Assignee:
BOSCH GMBH ROBERT (DE)
LIPPMANN NILS (DE)
LERCHE WOLFGANG (DE)
LIPPMANN NILS (DE)
LERCHE WOLFGANG (DE)
International Classes:
C21D1/06; C21D1/76; C21D1/773; C21D6/00; C23C8/02; C23C8/26; (IPC1-7): C23C8/26; C23C8/02; C23C8/80
Foreign References:
| DE3633490A1 | 1987-04-16 | |||
| DE1933439A1 | 1970-01-15 | |||
| US6168095B1 | 2001-01-02 | |||
| US2851387A | 1958-09-09 | |||
| EP0545069A1 | 1993-06-09 |
Other References:
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 07 31 July 1997 (1997-07-31)
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