Ferritic stainless steel sheet

Patent metadata

Field	Value
Publication number	US-2019106775-A1
Application number	US-201716087486-A
Country	US
Kind code	A1
Filing date	Feb 24, 2017
Priority date	Mar 29, 2016
Publication date	Apr 11, 2019
Grant date	—

Abstract

A ferritic stainless steel sheet is provided. The ferritic stainless steel includes, in mass %, C: 0.020% or less, Si: 0.05 to 0.50%, Mn: 0.05 to 0.50%, P: 0.040% or less, S: 0.030% or less, Al: 0.001 to 0.150%, Cr: 18.0 to 25.0%, Ti: 0.01 to 0.50%, Ca: 0.0001 to 0.0015%, O (oxygen): 0.0015 to 0.0040%, and N: 0.025% or less, with the balance being Fe and incidental impurities. The ferritic stainless steel sheet further satisfies formula (1), below: 0.5≤PBI≤20.0 . . . (1) (where PBI=(7Al+2Ti+Si+10Zr+130Ca)×O (oxygen)×1000, and Al, Ti, Si, Zr, Ca, and O (oxygen) in the formula each represent a content [mass %] of a corresponding element in the ferritic stainless steel sheet, and the content of an element not included in the ferritic stainless steel sheet is 0).

First claim

1 . A ferritic stainless steel sheet comprising, in mass %,
C: 0.020% or less, Si: 0.05 to 0.50%, Mn: 0.05 to 0.50%, P: 0.040% or less, S: 0.030% or less, Al: 0.001 to 0.150%, Cr: 18.0 to 25.0%, Ti: 0.01 to 0.50%, Ca: 0.0001 to 0.0015%, O (oxygen): 0.0015 to 0.0040%, and N: 0.025% or less, with the balance being Fe and incidental impurities, the ferritic stainless steel sheet further satisfying formula (1), below:
0.5≤PBI≤20.0  (1)

(where PBI=(7Al+2Ti+Si+10Zr+130Ca)×O (oxygen)×1000, and Al, Ti, Si, Zr, Ca, and O (oxygen) in the formula each represent a content [mass %] of a corresponding element in the ferritic stainless steel sheet, and a content of an element not contained in the ferritic stainless steel sheet is 0).

2 . The ferritic stainless steel sheet according to claim 1 , further comprising, in mass %, at least one selected from
Zr: 0.01 to 0.80%, Nb: 0.01% or greater and less than 0.40%, and V: 0.01 to 0.50%.

3 . The ferritic stainless steel sheet according to claim 1 or 2 , further comprising, in mass %, at least one selected from
Cu: 0.30 to 0.80%,
Ni: 0.01 to 2.50%,
Co: 0.01 to 0.50%,
Mo: 0.01 to 2.00%, and
W: 0.01 to 0.50%.

4 . The ferritic stainless steel sheet according to claim 2 , further comprising, in mass %, at least one selected from
Cu: 0.30 to 0.80%, Ni: 0.01 to 2.50%, Co: 0.01 to 0.50%, Mo: 0.01 to 2.00%, and W: 0.01 to 0.50%.

5 . The ferritic stainless steel sheet according to claim 1 , further comprising, in mass %, at least one selected from
B: 0.0003 to 0.0030%, Mg: 0.0005 to 0.0100%, Y: 0.001 to 0.20%, REM (rare earth metal): 0.001 to 0.10%, Sn: 0.01 to 0.50%, and Sb: 0.01 to 0.50%.

6 . The ferritic stainless steel sheet according to claim 2 , further comprising, in mass %, at least one selected from
B: 0.0003 to 0.0030%, Mg: 0.0005 to 0.0100%, Y: 0.001 to 0.20%, REM (rare earth metal): 0.001 to 0.10%, Sn: 0.01 to 0.50%, and Sb: 0.01 to 0.50%.

7 . The ferritic stainless steel sheet according to claim 3 , further comprising, in mass %, at least one selected from
B: 0.0003 to 0.0030%, Mg: 0.0005 to 0.0100%, Y: 0.001 to 0.20%, REM (rare earth metal): 0.001 to 0.10%, Sn: 0.01 to 0.50%, and Sb: 0.01 to 0.50%.

8 . The ferritic stainless steel sheet according to claim 4 , further comprising, in mass %, at least one selected from
B: 0.0003 to 0.0030%, Mg: 0.0005 to 0.0100%, Y: 0.001 to 0.20%, REM (rare earth metal): 0.001 to 0.10%, Sn: 0.01 to 0.50%, and Sb: 0.01 to 0.50%.

9 . The ferritic stainless steel sheet according to claim 1 , wherein the ferritic stainless steel sheet has low susceptibility to exfoliation of black spots in a weld zone during bending.

Assignees

• Jfe Steel Corp

Inventors

• Nishida Shuji
• Ishii Tomohiro
• Fujisawa Mitsuyuki
• Kami Chikara

Classifications

• C21D8/02

  during manufacturing of plates or strips (C21D8/12 takes precedence) · CPC title

• C22C38/002

  containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60 · CPC title

• C21D8/0205

  Chemistry & Metallurgy · mapped topic

• C21D6/005

  containing Mn · CPC title

• C22C38/46

  with vanadium · CPC title