Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1993-06-29
1995-05-30
Turner, Archene
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
411411, 428469, 428472, 428698, F16B 2500
Patent
active
054199484
ABSTRACT:
This invention allows the surface of an austenitic stainless steel screw surface to be formed into a hard nitrided layer so as to harden and a part such as a screw head which is in contact with outside air is removed its own ultra hard surface layer in the hard nitrided layer by scouring or the like to be rust preventive. Even if the ultra hard surface layer is thus removed, an inner hard layer in the hard nitrided layer is present beneath the surface layer to be able to maintain a hard state of the screw surface. In the method for manufacturing the austenitic stainless steel screw according to the invention, upon forming said hard nitrided layer on the screw surface by nitriding, the austenitic stainless steel screw surface is cleaned with a fluorine- or fluoride-containing gas prior to nitriding. Thereby remained foreign matter, oxidized layer and the like on the screw surface are removed and at the same time the screw surface is activated and so N atoms easily penetrate and diffuse when nitriding to form a uniform nitrided layer.
REFERENCES:
patent: 4184899 (1980-01-01), Blas et al.
Kitano Kenzo
Minato Teruo
Senbokuya Haruo
Tahara Masaaki
Yoshino Akira
Daidousanso Co. Ltd.
Turner Archene
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