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US 2021/0059019 A1Published application
Fe-Cr ALLOY, METHOD FOR PRODUCING SAME, AND RESISTANCE HEATING ELEMENT
AssigneeJfe Steel Corporation
InventorsAkito MIZUTANI, Tatsuhiko HIRATANI, Mitsuyuki FUJISAWA
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Abstract
A Fe—Cr alloy having a chemical composition with increased Si and Al contents, in which the chemical composition satisfies the following formula (1) in terms of the Si content, Al content, and Cr content: 14.0≤% Si+1.15×% Al+0.35×% Cr (1).
Claims12
A Fe—Cr alloy having a chemical composition containing, by mass %,
- C:
- 0.020% or less,
- Si:
- more than 1.5% and 10.0% or less,
- 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, the Fe—Cr alloy satisfying the following formula (1):
- 14.0≤% Si+1.15×% Al+0.35×% Cr (1)
- where % Si, % Al and % Cr indicate a Si content, an Al content, and a Cr content, by mass %, respectively in the chemical composition.
17 more elements
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:
- 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 having a final sheet thickness;
- 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 indicate a Si content, an Al content, and a Cr content, by mass %, respectively in the chemical composition of the Fe—Cr alloy.
19 more elements
Dependencies are inferred from the claim text.