The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 26, 2006
Filed:
Jul. 15, 2002
Philip J. Maziasz, Oak Ridge, TN (US);
Tim Mcgreevy, Morton, IL (US);
Michael James Pollard, East Peoria, IL (US);
Chad W. Siebenaler, Peoria, IL (US);
Robert W. Swindeman, Oak Ridge, TN (US);
Philip J. Maziasz, Oak Ridge, TN (US);
Tim McGreevy, Morton, IL (US);
Michael James Pollard, East Peoria, IL (US);
Chad W. Siebenaler, Peoria, IL (US);
Robert W. Swindeman, Oak Ridge, TN (US);
Caterpillar Inc, Peoria, IL (US);
Abstract
A CF8C type stainless steel alloy and articles formed therefrom containing about 18.0 weight percent to about 22.0 weight percent chromium and 11.0 weight percent to about 14.0 weight percent nickel; from about 0.05 weight percent to about 0.15 weight percent carbon; from about 2.0 weight percent to about 10.0 weight percent manganese; and from about 0.3 weight percent to about 1.5 weight percent niobium. The present alloys further include less than 0.15 weight percent sulfur which provides high temperature strength both in the matrix and at the grain boundaries without reducing ductility due to cracking along boundaries with continuous or nearly-continuous carbides. The disclosed alloys also have increased nitrogen solubility thereby enhancing strength at all temperatures because nitride precipitates or nitrogen porosity during casting are not observed. The solubility of nitrogen is dramatically enhanced by the presence of manganese, which also retains or improves the solubility of carbon thereby providing additional solid solution strengthening due to the presence of manganese and nitrogen, and combined carbon.