STEEL MATERIAL - NIPPON STEEL & SUMITOMO METAL CORP

Title:

STEEL MATERIAL

Document Type and Number:

WIPO Patent Application WO/2019/116520

Kind Code:

A1

Abstract:

A steel material which has a chemical composition that contains, in mass%, 0.01-0.20% of C, 0.01-1.00% of Si, 0.05-3.00% of Mn, 0-0.050% of P, 0-0.0100% of S, 0.05-0.25% of Sn, 0-0.100% of Al, 0.0005-0.0100% of N, 0.0001-0.0100% of O, 0-0.050% of Ti, 0-0.050% of Nb, 0-0.050% of V, 0-0.050% of W, 0-0.050% of Mo, 0-0.10% of Cu, 0-0.05% of Ni, 0-0.10% of Cr, 0-0.05% of Sb, 0-0.0010% of B, 0-0.0100% of Ca, 0-0.0100% of Mg and 0-0.0100% of REM, with the balance made up of Fe and impurities. This steel material is configured such that the Sn ratio, which is expressed by the a/b ratio between the Sn concentration (a) at the crystal grain boundaries and the Sn concentration (b) within the crystal grains, is 1.2 or less.

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Inventors:

SUGAE KIYONOBU (JP)
DOI TAKASHI (JP)
SHIGESATO GENICHI (JP)
KASHIMA KAZUYUKI (JP)

Application Number:

PCT/JP2017/044984

Publication Date:

June 20, 2019

Filing Date:

December 14, 2017

Export Citation:

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Assignee:

NIPPON STEEL & SUMITOMO METAL CORP (JP)

International Classes:

C22C38/00; C21D8/02; C22C38/60

Domestic Patent References:

WO2012161241A1	2012-11-29
WO2012133563A1	2012-10-04
WO2011102244A1	2011-08-25

Foreign References:

JP2010007109A	2010-01-14
JP2012122103A	2012-06-28
JP2012255184A	2012-12-27
JP2014001450A	2014-01-09
JP2010064110A	2010-03-25
JP2012057236A	2012-03-22
JP2012255184A	2012-12-27
JP2012144799A	2012-08-02
JPS5839151B2	1983-08-27

Other References: