logo

For the Inventor, By the Inventor

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 10815553 B1

PDFFull Text
Date of Patent:
Oct. 27, 2020

Filed:

Aug. 22, 2016

Galvannealed steel sheet and production method thereof

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Masaharu Oka, Tokyo, JP;

Nobusato Kojima, Tokyo, JP;

Tetsuya Okada, Tokyo, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Clark & Brody LLP

Primary Examiner:

Michael E La Villa

Int. Cl.
CPC ...
C22C 38/14 (2006.01); C22C 38/12 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/00 (2006.01); C21D 8/02 (2006.01); B32B 15/01 (2006.01); C21D 9/46 (2006.01); C21D 6/00 (2006.01); C23C 2/02 (2006.01); C23C 2/06 (2006.01); C23C 2/40 (2006.01); C23C 2/28 (2006.01); B32B 15/18 (2006.01); B32B 15/04 (2006.01); C22C 38/48 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C23C 30/00 (2006.01); C23C 2/12 (2006.01);
U.S. Cl.
CPC ...
C22C 38/14 (2013.01); B32B 15/01 (2013.01); B32B 15/012 (2013.01); B32B 15/013 (2013.01); B32B 15/015 (2013.01); B32B 15/04 (2013.01); B32B 15/043 (2013.01); B32B 15/18 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0263 (2013.01); C21D 8/0273 (2013.01); C21D 9/46 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/004 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/12 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/48 (2013.01); C23C 2/02 (2013.01); C23C 2/06 (2013.01); C23C 2/12 (2013.01); C23C 2/28 (2013.01); C23C 2/285 (2013.01); C23C 2/40 (2013.01); C23C 30/00 (2013.01); C23C 30/005 (2013.01); Y10T 428/12757 (2015.01); Y10T 428/12799 (2015.01); Y10T 428/12951 (2015.01); Y10T 428/12958 (2015.01); Y10T 428/12965 (2015.01);
Abstract

Provided is a galvannealed steel sheet having high strength and excellent deep drawability, and being further excellent in slab cracking resistance and secondary working embrittlement resistance. A base metal steel sheet of the galvannealed steel sheet has a chemical composition containing, in mass %: C: 0.0080% or less; Si: 0.7% or less; Mn: 1.0 to 2.5%; P: more than 0.030 to 0.048%; S: 0.025% or less; Al: 0.005 to 0.20%; N: 0.010% or less; Ti: 0.005 to 0.040%; Nb: 0.005 to 0.060%; and B: 0.0005 to 0.0030%, with the balance being Fe and impurities, satisfying Formula (1) to (4). A galvannealed layer contains 7 to 15 mass % of Fe.25×P+4×Si≤3.6  (1)B−X1≥0.0005  (2)C−(12/93)×Nb−X2≥−0.0035  (3)110×Si+48×Mn+550×P≥120  (4)

Find Patent Forward Citations

Loading…