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:
Sep. 02, 2025
Filed:
Dec. 23, 2020
Applicant:
Jfe Steel Corporation, Tokyo, JP;
Inventors:
Assignee:
JFE STEEL CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22C 38/60 (2006.01); B21B 1/02 (2006.01); B21B 1/08 (2006.01); C21D 8/02 (2006.01); C22C 38/00 (2006.01); C22C 38/38 (2006.01);
U.S. Cl.
CPC ...
C22C 38/60 (2013.01); B21B 1/02 (2013.01); B21B 1/0805 (2013.01); C21D 8/0226 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/38 (2013.01); B21B 2001/022 (2013.01);
Abstract
Free-cutting steel includes a specific composition, with an A value defined by a following formula (1) satisfying 4.0 or more and 20.0 or less, and remainder having Fe and an unavoidable impurity; and texture with 1000 or more sulfide particles with an equivalent circle diameter of less than 1 μm per mm, 500 or more sulfide particles with an equivalent circle diameter of 1 μm or more and 5 μm or less per mm, and 1000 or more Pb particles with an equivalent circle diameter of 1 μm or less per mm, whereinA value=(Mn+5Cr)/S (1)