Metal treatment – Process of modifying or maintaining internal physical... – Carburizing or nitriding using externally supplied carbon or...
Reexamination Certificate
2011-03-22
2011-03-22
King, Roy (Department: 1733)
Metal treatment
Process of modifying or maintaining internal physical...
Carburizing or nitriding using externally supplied carbon or...
C148S028000, C148S242000
Reexamination Certificate
active
07909943
ABSTRACT:
A process for hardening a work piece of stainless steel through diffusion of the elements carbon and/or nitrogen into the work piece surfaces. The work piece is submerged into a molten salt bath and subjected to the molten salt bath for a period ranging from 15 minutes to 240 hours at temperatures below 450° C. In addition to potassium chloride and lithium chloride, the molten salt bath contains an activator substance consisting of barium chloride, strontium chloride, magnesium chloride and/or calcium chloride, and a free or complex cyanide as carbon-donating substance.
REFERENCES:
patent: 2248732 (1941-07-01), Albrecht et al.
patent: 5593510 (1997-01-01), Tahara et al.
patent: 1 007 795 (1957-05-01), None
patent: 0 054 962 (1981-12-01), None
patent: 2 153 855 (1985-08-01), None
Kolsterisieren® (Kolsterising®—Corrosion resistant surface hardening of austenitic stainless steel) [online], [retrieved on Apr. 16, 2010] Retrieved from the Bodycote website using Internet <URL: http://internet.bodycote.org/deu/media/files/Brochures/Processes/Kolsterising/Kolsterising-B/Brochure—Kolsterisieren—DE—10—2008.pdf>.
Gümpel, P. et al., “Rostfreie Stähle” (Corrosion-Resistant Steels), Expert Publishing House, vol. 349 (1998), Renningen Malmsheim.
Günther, D., et al., “Oberflächenhärtung von Austenitischen Stählen unter Beibehaltung der Korrosionsbeständigkeit*” (Surface Hardening of Austenitic Steels while Maintaining Corrosion-Resistance), Härterei-Techn. Mitt. (Hardening Technology Information), 56 (2001), pp. 74-83.
Spies, H.-J., et al., “Struktur und Eigenschaften nichtrostender Stähle nach einer Plasmaimmersionsionenimplantation und einer Plasmanitrierung” (Structure and properties of stainless steels after plasma immersion ion implantation and plasma nitriding), Mat.—Wiss. U. Werkstofftech 30 (Material Knowledge and Material Technology 30), WILEY-VCH Verlag GmbH (1999), pp. 457-464.
“Edelstahl Rostfrei—Eigenschaften—Informationsstelle Edelstahl” (Corrosion-Resistant Stainless Steel—Characteristics—Information Source for Stainless Steel), 2003 [online], [retrieved on Apr. 16, 2010] Retrieved from the Edelstahl-Rostfrei website using Internet <URL:http://www.edelstahl-rostfrei.de/daten/MB—821.pdf>.
Sun, Y. et al., “The Response of Austenitic Stainless Steels to Low-temperature Plasma Nitriding,” Heat Treatment of Metals, Issue No. 1 (1999), pp. 9-16.
Wägner, M., “Steigerung der Verschleiβfestigkeit nichtrostender austenitischer Stähle” (Improving the Corrosion-Resistance of Non-Rusting Aust. Steels), STAHL (Steel), Issue No. 2 (2004), pp. 40-43.
German Patent and Trademark Office Action, dated May 2, 2007, issued in connection with related German Application No. 10 2006 026 883.0, and partial translation.
Baudis Ulrich
Niedermeyer Michael
Durferrit GmbH
Flandro Ryan M.
Kinberg Robert
King Roy
Roe Jessee R.
LandOfFree
Method for hardening stainless steel and molten salt bath... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for hardening stainless steel and molten salt bath..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for hardening stainless steel and molten salt bath... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2731504