STEEL IN WHICH Cu-Sn COEXIST, AND METHOD FOR MANUFACTURING SAME

Title:

STEEL IN WHICH Cu-Sn COEXIST, AND METHOD FOR MANUFACTURING SAME

Document Type and Number:

WIPO Patent Application WO/2015/029994

Kind Code:

A1

Abstract:

The main purpose of the present invention is to provide a method for manufacturing a steel in which Cu-Sn coexist, said steel maintaining an excellent surface quality even when hot-rolled. The present invention involves continuously casting a molten steel that contains, by mass%, C: 0.04-0.20%, Si: 0.05-1.00%, Mn: 0.20-2.50%, P: 0.05% or less, S: 0.02% or less, Cu: 0.20-1.50%, and Sn: 0.06-0.50%, and further contains Al: 0.06-1.00%, and Ni: 0.05-1.00%, with the remainder comprising Fe and impurities. When manufacturing the steel in which Cu-Sn coexist, if [X] is the content ratio of an element (X) in the molten steel, the component composition of the molten steel is adjusted to satisfy [Al]/(3[Si]+[Mn]) ≥ 0.050, [Ni]/([Cu]+5[Sn]) ≥ 0.10, and [Al]/[Ni] ≥ 0.20. An internal oxidation layer is formed by oxidising a slab surface in a slab cooling process, and a composite oxide produced in the internal oxidation layer is configured to contain Al2O3.

More Like This:

JP2011143455	METHOD AND DEVICE OF MANUFACTURING MAGNET MATERIAL
JP2018047480	CONTINUOUS STEEL CASTING METHOD
WO/2013/054845	THIN R-T-B ALLOY, R-T-B BASED SINTERED MAGNET, AND PRODUCTION METHOD FOR SAME

Inventors:

YOSHIDA NAOTSUGU (JP)
NAKAMURA HIROFUMI (JP)
KAMIMURA TAKAYUKI (JP)
OTSUKA NOBUO (JP)

Application Number:

PCT/JP2014/072287

Publication Date:

March 05, 2015

Filing Date:

August 26, 2014

Export Citation:

Click for automatic bibliography generation Help

Assignee:

NIPPON STEEL & SUMITOMO METAL CORP (JP)

International Classes:

B22D11/00; C21D9/00; C22C38/00; C22C38/16

Foreign References:

JPH06198304A	1994-07-19
JP2007270196A	2007-10-18
JP2012177143A	2012-09-13
JPH0813086A	1996-01-16
JP2014001445A	2014-01-09
JP2004360063A	2004-12-24
JPH06256904A	1994-09-13
JP2011042859A	2011-03-03

Other References:

See also references of EP 3006137A4
KUNISHIGE, KAZUTOSHI: "Current Advances in Materials and Processes", vol. 13, 2000, THE IRON AND STEEL INSTITUTE OF JAPAN, article "Suppression of Surface Hot-shortness Induced by Cu and/or Sn", pages: 1080 - 1083

Attorney, Agent or Firm:

YAMAMOTO, Noriaki et al. (JP)
Yamamoto 典輝 (JP)

Download PDF:

View/Download PDF PDF Help

Previous Patent: HIGH-STRENGTH STEEL, AND CRANKSHAFT MANUFACTURED USING SAID HIGH-STRENGTH STEEL

Next Patent: JOINT AND METHOD FOR MANUFACTURING PIPE BODY WITH JOINT