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:
Dec. 31, 1985
Filed:
Nov. 07, 1983
Toshiyuki Kato, Chiba, JP;
Isao Takahashi, Ichihara, JP;
Toshio Irie, Chiba, JP;
Yozo Ogawa, Okayama, JP;
Kawasaki Steel Corporation, Kobe, JP;
Abstract
A dual phase-structured hot rolled steel sheet having a composition consisting of 0.03-0.15% by weight of C. 0.6-1.8% by weight of Mn, 0.04-0.2% by weight of P, not more than 0.10% of Al, not more than 0.008% by weight of S, and the remainder being substantially Fe, and having a microstructure consisting of ferrite and martensite dispersed therein, the area fraction of said ferrite being at least 70% and that of said martensite being at least 5% at the section of the steel sheet, has a high tensile strength and a low yield ratio of not higher than 70%, and has excellent formability. The steel sheet can be produced in a simple manner by cooling directly a hot rolled sheet at an ordinary cooling rate without the use of a particular cooling pattern.