Method for producing Fe—Cr alloy

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.