Further, the alloy described in PTLs 1 and 2, which is Fe—Cr alloy, has an austenite microstructure because it contains Ni as an austenite-stabilizing element at a content of 10% to 15% and thus is advantageous in that it has higher strength at high temperatures than Fe—Cr alloy having a ferrite microstructure. However, since the austenite microstructure has a higher thermal expansion coefficient than the ferrite microstructure, a large thermal stress occurs along with volume expansion during heating. In particular, when heating and cooling are repeated under conditions such that the maximum use temperature exceeds 1000° C., deformation and fracture due to the thermal stress easily occur, leading to a shorter life.

It could thus be helpful to provide Fe—Cr alloy which is suitable for using as a resistance heating element, the Fe—Cr alloy having high electric resistivity and excellent in oxidation resistance, in particular oxidation resistance at a high temperature beyond 1000° C., and an advantageous method for producing the same.

Further, it also provides a resistance heating element using the Fe—Cr alloy.

In order to solve the above problems, the inventors made various studies, and as a result, discovered the following.