Fe—Cr alloy, method for producing same, and resistance heating element
地域：
Tokyo
摘要
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).
說(shuō)明書(shū)
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This disclosure relates to Fe—Cr alloy excellent in electric resistivity and oxidation resistance.
Resistance heating is a method of heating an object by Joule heat generated when a current is applied to a resistance heating element. Since this method has good efficiency of conversion from electric energy to heat energy and uses a simple control apparatus, it is used in a wide range of fields including industrial electric furnaces and electric cooking apparatuses.
Resistance heating elements used in the resistance heating can be classified into metallic heating elements represented by Ni—Cr alloy and Fe—Cr alloy and non-metallic heating elements represented by SiC. The metallic heating elements are superior to the non-metallic heating elements in terms of workability, and thus can be formed into a foil or wire material. Therefore, the metallic heating elements are applicable to thin members such as window glasses and floors, and to members applied with bending loads such as gloves.
As such metallic heating elements, for example, JIS C 2520 specifies three types of Ni—Cr alloy as wires and strips for electrical heating (Type 1 to Type 3 of nickel chromium wires and strips for electrical heating), and two types of Fe—Cr alloy (Type 1 and Type 2 of iron chromium wires and strips for electrical heating). The Ni—Cr alloy is Ni-based alloy having Cr:15% to 21% and Si: 0.75% to 3% as main additive elements. The Fe—Cr alloy is Fe-based alloy having Cr: 17% to 26%, Al: 2% to 6%, Si: 1.5% or less as main additive elements (“%” of each element represents a mass %, hereinafter the same).
權(quán)利要求
The invention claimed is:1. A Fe—Cr alloy having a chemical composition consisting of, by mass %,C: 0.020% or less, Si: 3.1% to 10.0%, 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, Ni: 0.50% or less, and Ca: 0.0002% to 0.0100%, 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. 2. The Fe—Cr alloy according to claim 1 having a sheet thickness of 200 μm or less. 3. A resistance heating element made of the Fe—Cr alloy according to claim 2 . 4. A resistance heating element made of the Fe—Cr alloy according to claim 1 . 5. The Fe—Cr alloy according to claim 1 , wherein the Al content of the chemical composition is 5.3% to 6.5%. 6. A Fe—Cr alloy having a chemical composition consisting of, by mass %,C: 0.020% or less, Si: 3.1% to 10.0%, 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, Ni: 0.50% or less, Ca: 0.0002% to 0.0100%, and at least one selected from the group consisting ofZr: 0.01% to 0.20%, Hf: 0.01% to 0.20%, REM: 0.01% to 0.20%, Cu: 0.01% to 0.10%, V: 0.01% to 0.50%, Mo: 0.01% to 6.0%, B: 0.0001% to 0.0050%, and Mg: 0.0002% to 0.0100%, 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. 7. The Fe—Cr alloy according to claim 6 having a sheet thickness of 200 μm or less. 8. A resistance heating element made of the Fe—Cr alloy according to claim 7 . 9. A resistance heating element made of the Fe—Cr alloy according to claim 6 . 10. The Fe—Cr alloy according to claim 6 , wherein the Al content of the chemical composition is 5.3% to 6.5%. 11. A Fe—Cr alloy having a chemical composition consisting of, by mass %,C: 0.020% or less, Si: 3.1% to 10.0%, Mn: 1.0% or less, P: 0.040% or less, S: 0.010% or less, Cr: 16.0% to 30.0%, Al: 4.0% to 6.5%, N: 0.020% or less, Ni: 0.50% or less, W: 2.3% to 6.0%, Ca: 0.0002% to 0.0100%, and at least one selected from the group consisting ofTi: 0.01% to 0.50%, Zr: 0.01% to 0.20%, Hf: 0.01% to 0.20%, REM: 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%, B: 0.0001% to 0.0050%, and Mg: 0.0002% to 0.0100%, 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. 12. The Fe—Cr alloy according to claim 11 having a sheet thickness of 200 μm or less. 13. A resistance heating element made of the Fe—Cr alloy according to claim 12 . 14. A resistance heating element made of the Fe—Cr alloy according to claim 11 . 15. The Fe—Cr alloy according to claim 11 , wherein the Al content of the chemical composition is 5.3% to 6.5%. 16. A Fe—Cr alloy having a chemical composition consisting of, by mass %,C: 0.020% or less, Si: 5.5% to 10.0%, Mn: 1.0% or less, P: 0.040% or less, S: 0.010% or less, Cr: 16.0% to 30.0%, Al: 4.0% to 6.5%, N: 0.020% or less, Ni: 0.50% or less, Ca: 0.0002% to 0.0100%, and at least one selected from the group consisting ofTi: 0.01% to 0.50%, Zr: 0.01% to 0.20%, Hf: 0.01% to 0.20%, REM: 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%, and Mg: 0.0002% to 0.0100%, 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. The Fe—Cr alloy according to claim 16 having a sheet thickness of 200 μm or less. 18. A resistance heating element made of the Fe—Cr alloy according to claim 17 . 19. A resistance heating element made of the Fe—Cr alloy according to claim 16 . 20. The Fe—Cr alloy according to claim 16 , wherein the Al content of the chemical composition is 5.3% to 6.5%. 21. A Fe—Cr alloy having a chemical composition consisting of, by mass %,C: 0.020% or less, Si: 3.1% to 10.0%, Mn: 1.0% or less, P: 0.040% or less, S: 0.010% or less, Cr: 16.0% to 30.0%, Al: 5.5% 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. 22. A Fe—Cr alloy having a chemical composition consisting of, by mass %,C: 0.020% or less, Si: 3.1% to 10.0%, Mn: 1.0% or less, P: 0.040% or less, S: 0.010% or less, Cr: 16.0% to 30.0%, Al: 5.5% to 6.5%, N: 0.020% or less, Ni: 0.50% or less, and at least one selected from the group consisting ofZr: 0.01% to 0.20%, Hf: 0.01% to 0.20%, REM: 0.01% to 0.20%, Cu: 0.01% to 0.10%, V: 0.01% to 0.50%, Mo: 0.01% to 6.0%, B: 0.0001% to 0.0050%, Ca: 0.0002% to 0.0100%, and Mg: 0.0002% to 0.0100%, 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. 23. A Fe—Cr alloy having a chemical composition consisting of, by mass %,C: 0.020% or less, Si: 3.1% to 10.0%, 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, Ni: 0.50% or less, and Mg: 0.0002% to 0.0100%, 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. 24. The Fe—Cr alloy according to claim 23 , wherein the Al content of the chemical composition is 5.3% to 6.5%. 25. A Fe—Cr alloy having a chemical composition consisting of, by mass %,C: 0.020% or less, Si: 3.1% to 10.0%, 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, Ni: 0.50% or less, Mg: 0.0002% to 0.0100%, and at least one selected from the group consisting ofZr: 0.01% to 0.20%, Hf: 0.01% to 0.20%, REM: 0.01% to 0.20%, Cu: 0.01% to 0.10%, V: 0.01% to 0.50%, Mo: 0.01% to 6.0%, B: 0.0001% to 0.0050%, and Ca: 0.0002% to 0.0100%, 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. 26. The Fe—Cr alloy according to claim 25 , wherein the Al content of the chemical composition is 5.3% to 6.5%.
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