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:
Jan. 07, 1986
Filed:
Aug. 27, 1984
Applicant:
Inventors:
Heiji Sugita, Ichikawa, JP;
Takehiko Kato, Kobe, JP;
Assignee:
Sugita Wire Mfg. Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D / ;
U.S. Cl.
CPC ...
148 / ;
Abstract
A high strength bolt having a as-formed structure and a method of manufacturing the high strength bolt which method comprises the steps of: heating a steel alloy containing 0.15 to 0.3 wt % C and 1 to 3 wt % Mn to a temperature not lower than Ac.sub.3 transformation point; subjecting the steel alloy to isothermal transformation at 450.degree. to 580.degree. C.; subjecting, after cooling, the steel alloy to cold wire drawing at a reduction rate not larger than 40%; and bolt forming the steel. A cold wire drawing at a reduction rate not larger than 40% may be carried out before the above-mentioned isothermal transformation step.