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:
Apr. 22, 1986
Filed:
Dec. 08, 1983
Daido Steel Company Limited, Nagoya, JP;
Abstract
A bolting bar material consists in weight ratio of 0.05.about.0.2% of C, 0.05.about.0.8% of Si, 0.8.about.2% of Mn, not more than 0.035% of P, not more than 0.030% of S, 0.005.about.0.05% of Nb, 0.01.about.0.05% of Al, 0.005.about.0.025% of N, 0.05.about.0.35% in total of at least one element selected from not more than 0.25% of V, not more than 0.25% of Ti and not more than 0.25% of Zr, and if necessary, 0.05.about.1.5% in total of at least one element selected from 0.05.about.0.5% of Ni, 0.05.about.0.5% of Cr and 0.05.about.0.5% of Mo, and the balance of Fe. In the production of the bolting bar material, the steel having the above composition is heated to 1000.degree..about.1100.degree. C., rolled at a finish rolling temperature of 750.degree..about.950.degree. C. and cooled at a rate of 5.degree..about.50.degree. C./sec on average.