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:
May. 02, 2000
Filed:
Jul. 20, 1998
Riad Asfahani, Cranberry Township, PA (US);
Samuel J Manganello, Pittsburgh, PA (US);
USX Corporation, Pittsburgh, PA (US);
Abstract
A high performance weathering steel having a minimum yield strength of 70-75 ksi and a yield/tensile ratio less than about 0.85 is produced from a steel composition consisting essentially, in weight percent, of about: carbon 0.08-0.12%; manganese 0.80-1.35%; silicon 0.30-0.65%; molybdenum 0.08-0.35%; vanadium 0.06-0.14%; copper 0.20-0.40%; nickel 0.50% max.; chromium 0.30-0.70%; phosphorous 0.010-0.020%; columbium up to about 0.04%, titanium up to 0.02%, sulfur up to 0.01%, iron, balance except for incidental impurities; heating the steel to a hot rolling temperature, rolling the steel to a thickness about 2 to 3 times the final desired thickness, air-cooling the steel to a temperature of about 1800-1850.degree. F. (RCR) or about 1600-1650.degree. F. (CCR), recrystallize control rolling or conventionally control rolling the steel with finish rolling at a temperature of about 1700-1750.degree. F. (RCR) or about 1400-1500.degree. F. (CCR), then water-cooling the steel to about 900-1200.degree. F., especially about 1100.degree. F., then air-cooling the steel to ambient temperature, to produce sections up to at least 2 inches thick and a length of 90 feet or more, without further heat treatment.