FERRITIC STAINLESS-STEEL SHEET AND METHOD FOR MANUFACTURING SAME

Title:

FERRITIC STAINLESS-STEEL SHEET AND METHOD FOR MANUFACTURING SAME

Document Type and Number:

WIPO Patent Application WO/2019/087761

Kind Code:

A1

Abstract:

Provided are a ferritic stainless-steel sheet having superior toughness and exceptional corrosion resistance, and a method for manufacturing the ferritic stainless-steel sheet. This ferritic stainless-steel sheet has a component composition comprising 0.001-0.020% of C, 0.05-0.35% of Si, 0.05-1.00% of Mn, 0.04% or less of P, 0.01% or less of S, 0.001-0.300% of Al, 10.0-13.0% of Cr, 0.75-1.50% of Ni, 0.05-0.35% of Ti, 0.001-0.020% of N, and 65% or more of γI[%], which comprises formula (1), the balance being Fe and unavoidable impurities. The average crystal grain diameter of the metal structure is 45 μm or less. The ferritic stainless-steel sheet is manufactured by subjecting a steel slab having the component composition described above to hot-rolling and then to hot-rolled-sheet annealing at 750-1050°C. Formula (1): γI[%] = 24Ni + 12Mn + 6Cu - 18Si - 12Cr - 12Mo + 188, where the Ni, Mn, Cu, Si, Cr, and Mo in formula (1) represent the content amounts (in percent by mass) for each of these components, and are 0 when the components are not present.

Inventors:

INOUE KEISHI (JP)
KAWABE HIDETAKA (JP)
YOSHINO MASATAKA (JP)
FUJISAWA MITSUYUKI (JP)

Application Number:

PCT/JP2018/038400

Publication Date:

May 09, 2019

Filing Date:

October 16, 2018

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

C22C38/00; C21D8/02; C22C38/50; C22C38/54

Domestic Patent References:

WO2018199062A1

2018-11-01

Foreign References:

JP2007016310A	2007-01-25
JP2016191150A	2016-11-10
JPS5871331A	1983-04-28
JP2016191150A	2016-11-10

Other References: