Method for producing Fe—Cr alloy

Patent metadata

Field	Value
Publication number	US-12137501-B2
Application number	US-202117449128-A
Country	US
Kind code	B2
Filing date	Sep 28, 2021
Priority date	Jan 30, 2018
Publication date	Nov 5, 2024
Grant date	Nov 5, 2024

Abstract

A method for producing a Fe—Cr alloy comprises: rolling a slab having a chemical composition containing, by mass %, C: 0.020% or less, Si: 0.01% to 1.5%, Mn: 1.0% or less, P: 0.040% or less, S: 0.010% or less, Cr: 16.0% to 30.0%, Al: 2.0% to 6.5%, N: 0.020% or less, and Ni: 0.50% or less, with the balance being Fe and inevitable impurities to obtain a sheet material; subjecting the sheet material to siliconizing treatment by a thermal CVD method to obtain a Fe—Cr alloy having a Si content of more than 1.5 mass % and 10.0 mass % or less and satisfying:

14.0%≤Si+1.15×% Al+0.35×% Cr  (1)

where % Si, % Al, and % Cr indicate Si, Al, and Cr contents, by mass %, respectively in the chemical composition of the Fe—Cr alloy.

First claim

The invention claimed is:

1. A method for producing a Fe—Cr alloy, comprising:
rolling a slab having a chemical composition containing, by mass %,
C: 0.020% or less,
Si: 0.01% to 1.5%,
Mn: 1.0% or less,
P: 0.040% or less,
S: 0.010% or less,
Cr: 20.5% to 30.0%,
Al: 5.5% to 6.5%,
N: 0.020% or less,
Ni: 0.50% or less, and
total content of C and N: 0.014% or more, with the balance being Fe and inevitable impurities, to obtain a sheet material having a final sheet thickness; and
subjecting the sheet material to siliconizing treatment by a thermal CVD method, to obtain a Fe—Cr alloy having a Si content of more than 1.5 mass % and 10.0 mass % or less and satisfying the following formula (1):
14.0≤% Si+1.15×% Al+0.35×% Cr  (1)

where % Si, % Al, and % Cr in formula (1) indicate a Si content, an Al content, and a Cr content, by mass %, respectively, in the chemical composition of the Fe—Cr alloy.

2. The method for producing a Fe—Cr alloy according to claim 1 , wherein the chemical composition of the slab further contains, by mass %, at least one selected from the group consisting of
Ti: 0.01% to 0.50%,
Zr: 0.01% to 0.20%,
Hf: 0.01% to 0.20%,
REM wherein REM refers to Sc, Y and lanthanoid elements: 0.01% to 0.20%,
Cu: 0.01% to 0.10%,
Nb: 0.01% to 0.50%,
V: 0.01% to 0.50%,
Mo: 0.01% to 6.0%,
W: 0.01% to 6.0%,
B: 0.0001% to 0.0050%,
Ca: 0.0002% to 0.0100%, and
Mg: 0.0002% to 0.0100%.

3. The method for producing a Fe—Cr alloy according to claim 2 , wherein the sheet material has a final sheet thickness of 200 μm or less.

4. The method for producing a Fe—Cr alloy according to claim 1 , wherein the sheet material has a final sheet thickness of 200 μm or less.

Assignees

• Jfe Steel Corp

Inventors

• Mizutani Akito
• Hiratani Tatsuhiko
• Fujisawa Mitsuyuki

Classifications

• C21D8/02

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

• B21B2261/14

  Roughness · CPC title

• B21B45/06

  of strip material (B21B45/08 takes precedence) · CPC title

• B21B2001/221

  by cold-rolling · CPC title

• B21B1/227

  Surface roughening or texturing · CPC title