Patent ID: 8318256

Claim:
A method of manufacturing a metallic material, the method comprising: a chemical conversion treatment step of manufacturing a metallic material comprising: an iron-based metallic material; an oxide layer that is formed on the surface of the iron-based metallic material, wherein the oxide layer includes Fe and at least one kind of metal (A) selected from a group consisting of Zr, Ti, and Hf by making an iron-based metallic material come into contact with an acid aqueous solution that includes: metal (A) ions of at least one kind of metal (A) selected from a group consisting of Zr, Ti, and Hf, 30 ppm or more of Fe ions, and oxidant ions; and an oxidation treatment step, after the chemical conversion treatment step, of heating the metallic material wherein oxidation takes place at a temperature of 400° C. or more.