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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.:

US 10745772 B1

PDFFull Text
Date of Patent:
Aug. 18, 2020

Filed:

Mar. 03, 2015

Age hardening non-heat treated bainitic steel

Applicants:

Daido Steel Co., Ltd., Aichi, JP;

Denso Corporation, Aichi, JP;

Inventors:

Yuuki Tanaka, Aichi, JP;

Makoto Haritani, Aichi, JP;

Takahiro Miyazaki, Aichi, JP;

Kouji Morita, Aichi, JP;

Yoshihiro Tanimura, Aichi, JP;

Toshimasa Ito, Aichi, JP;

Tadashi Nishiwaki, Aichi, JP;

Tomomitsu Fukuoka, Aichi, JP;

Assignees:

DAIDO STEEL CO., LTD., Aichi, JP;

DENSO CORPORATION, Aichi, JP;

Attorney:

Greenblum & Bernstein, P.L.C.

Primary Examiner:

Matthew E Hoban

Assistant Examiner:

Lynne Edmondson

Int. Cl.
CPC ...
C21D 6/00 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/48 (2006.01); C22C 38/60 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/46 (2006.01); C22C 38/50 (2006.01); C21D 6/02 (2006.01); C22C 38/58 (2006.01);
U.S. Cl.
CPC ...
C21D 6/008 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/02 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/58 (2013.01); C22C 38/60 (2013.01); C21D 6/00 (2013.01); C21D 2211/002 (2013.01);
Abstract

The present invention provides an age hardening type bainitic microalloyed steel having a composition which includes, in terms of mass %: 0.06-0.35% of C; 0.01-2.00% of Si; 0.10-3.00% of Mn; 0.001-0.200% of S; 0.001-2.00% of Cu; 0.40-3.00% of Ni; 0.10-3.00% of Cr; 0.10-1.00% of Mo; 0.10-1.00% of V; and 0.001-0.100% of s-Al, with the remainder being Fe and unavoidable impurities, and which satisfies a value of the following expression (1) to be 20 or larger and a value of the following expression (2) to be 0.82 or larger:3×[C]+10×[Mn]+2×[Cu]+2×[Ni]+12×[Cr]+9×[Mo]+2×[V]  expression (1);1.66×[C]+0.18×[Si]+0.27×[Mn]+0.09×[Ni]+0.32×[Cr]+0.34×[Mo]+0.44×[V]  expression (2),in which each [ ] in the expression (1) and the expression (2) indicates a content of the element shown therein in terms of mass %.

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