Fe-based metal plate and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-9679687-B2
Application number	US-201414524038-A
Country	US
Kind code	B2
Filing date	Oct 27, 2014
Priority date	Oct 28, 2009
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

On at least one surface of a base metal plate ( 1 ) of an α-γ transforming Fe or Fe alloy, a metal layer ( 2 ) containing ferrite former is formed. Next, the base metal plate ( 1 ) and the metal layer ( 2 ) are heated to an A3 point of the Fe or the Fe alloy, whereby the ferrite former are diffused into the base metal plate ( 1 ) to form an alloy region ( 1 b ) in a ferrite phase in which an accumulation degree of {200} planes is 25% or more and an accumulation degree of {222} planes is 40% or less. Next, the base metal plate ( 1 ) is heated to a temperature higher than the A3 point of the Fe or the Fe alloy, whereby the accumulation degree of the {200} planes is increased and the accumulation degree of the {222} planes is decreased while the alloy region ( 11 b ) is maintained in the ferrite phase.

First claim

The invention claimed is:

1. An Fe-based metal plate, containing ferrite former,
wherein, in a surface, an accumulation degree of {200} planes in a ferrite phase is 30% or more and an accumulation degree of {222} planes in the ferrite phase is 30% or less, and
wherein a ratio of an α single phase region to the Fe-based metal plate in a thickness direction is not less than 5% nor more than 80%.

2. The Fe-based metal plate according to claim 1 , being formed by diffusion of the ferrite former from a surface to an inner part of an α-γ transforming Fe or Fe alloy plate.

3. The Fe-based metal plate according to claim 1 , comprising, on the surface, a metal layer containing the ferrite former.

4. The Fe-based metal plate according to claim 1 , wherein the accumulation degree of the {200} planes is 50% or more and the accumulation degree of the {222} planes is 15% or less.

5. The Fe-based metal plate according to claim 1 , wherein the ferrite former is Al, Cr, Ga, Ge, Mo, Sb, Si, Sn, Ti, V, W, Zn, or any combination thereof.

6. The Fe-based metal plate according to claim 1 , further containing a 1% ferrite single phase region or more in terms of an area ratio in a thicknesswise cross section of the metal plate.

Assignees

• Nippon Steel & Sumitomo Metal Corp

Inventors

• Inaguma Tooru
• Tomita Miho
• Mizuhara Youji
• Sakamoto Hiroaki

Classifications

• C21D2221/00

  Treating localised areas of an article · CPC title

• C22C38/001

  containing N · CPC title

• B32B15/013

  one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium · CPC title

• C23C14/5893

  Mixing of deposited material · CPC title

• C21D2221/10

  Differential treatment of inner with respect to outer regions, e.g. core and periphery, respectively · CPC title