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:
Nov. 20, 1984
Filed:
Feb. 23, 1983
Applicant:
Inventor:
Grigory Lyudkovsky, Hammond, IN (US);
Assignee:
Inland Steel Company, Chicago, IL (US);
Primary Examiner:
Int. Cl.
CPC ...
B21B / ; H01F / ;
U.S. Cl.
CPC ...
148 315 ; 148 3155 ; 148120 ; 148121 ; 148122 ; 148111 ; 148 / ;
Abstract
A cold rolled steel strip contains alloying elements, such as Al and Si, which have an affinity for oxygen greater than that of iron. During annealing of the strip, these alloying elements undergo oxidation to form an internal oxidation layer adjacent the surface of the strip. Formation of such an internal oxidation layer in the cold rolled steel strip is impeded by adding antimony to the steel, and depletion of the antimony prior to annealing the cold rolled strip is minimized by minimizing annealing and pickling of the strip before the strip attains substantially its final thickness.