STEEL STOCK - NIPPON STEEL CORP

Title:

STEEL STOCK

Document Type and Number:

WIPO Patent Application WO/2021/095186

Kind Code:

A1

Abstract:

This steel stock has a chemical composition comprising, in terms of percentage by mass, C: 0.0010% or more but less than 0.010%; Si: 0.03 to 0.60%; Mn: 0.10 to 1.50%; Cu: 0.05 to 0.50%; Sb: 0.02 to 0.30%; Ni: 0.02 to 0.50%; Cr: 0.02 to 0.09%; Al: 0.005 to 0.080%; N: 0.008% or less; P: 0.025% or less; S: 0.001 to 0.015%; O: 0.0005 to 0.0035%; Mo: 0 to 0.50%; W: 0 to 0.50%; Sn: 0 to 0.30%; As: 0 to 0.30%; Co: 0 to 0.30%; Bi: 0 to 0.010%; Ti: 0 to 0.050%; Nb: 0 to 0.10%; V: 0 to 0.10%; Zr: 0 to 0.050%; Ta: 0 to 0.050%; B: 0 to 0.010%; Ca: 0 to 0.010%; Mg: 0 to 0.010%; and REM: 0 to 0.010%, the balance being Fe and impurities. In addition, CI: 17.0 to 30.0, DI: 1.00 to 3.00, and Ceq: 0.100 to 0.220. MnS and MnS oxide are included in the steel stock. The number density of MnS is less than 10.0/mm2, and the ratio of the number density of MnS oxide to the number density of MnS is 0.10 or greater.

Inventors:

IMAMURA JUNKO (JP)
NAGASAWA MAKOTO (JP)
KODAMA MASAYUKI (JP)
YATOH HISAYOSHI (JP)
TSURUTA AKIHIRO (JP)

Application Number:

PCT/JP2019/044612

Publication Date:

May 20, 2021

Filing Date:

November 13, 2019

Export Citation:

Click for automatic bibliography generation Help

Assignee:

NIPPON STEEL CORP (JP)

International Classes:

C22C38/00; C22C38/60

Domestic Patent References:

WO2014091604A1

2014-06-19

Foreign References:

JP2011246767A	2011-12-08
JP2004169048A	2004-06-17
JP2008231544A	2008-10-02
JP2015132004A	2015-07-23
JP2013060653A	2013-04-04
JP2002249823A	2002-09-06