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:
Oct. 07, 1980
Filed:
Jan. 08, 1979
Applicant:
Inventors:
George M Waid, Burton, OH (US);
Robert T Ault, Shaker Heights, OH (US);
Assignee:
Republic Steel Corp., Cleveland, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D / ;
U.S. Cl.
CPC ...
148-2 ; 75124 ; 148 124 ; 148 36 ; 148143 ;
Abstract
Steel well casing having the combined properties of excellent resistance to hydrogen sulfide stress corrosion and high yield strength ranging upward from 90,000 to 145,000 psi comprised of an aluminum-killed steel alloyed with chromium, molybdenum and vanadium. The casing is quenched to martensite from an austenitizing temperature in the range of from 1550.degree. to 1700.degree. F. and is tempered in the range of from 1200.degree. to 1400.degree. F. to a maximum hardness of 35 R.sub.C.