| 摘要 |
PROBLEM TO BE SOLVED: To obtain outdoor titanium in which the generation of discoloration is prevented over a long period and free from the need of maintenance by imparting surface roughness in which the center line average roughness is prescribed and oxidized coating on the surface in which thickness is specified to outdoor titanium or the like. SOLUTION: The surface roughness of an outdoor titanium or titanium allay material is regulated to <=3μm, preferably to <=1.5μm by the center line average roughness Ra, and the thickness of oxidized coating on the surface is regulated to >=20Åpreferably, to >=40Å. Furthermore, the regulation of the surface roughness is executed by regulating the surface roughness of rolling rolls, rolling loads and the velocity thereof, and for the regulation of the thickness of the oxidized coating, an oxidation treating method by heat treatment and an anodic oxidation treating method of forming oxidized coating by flowing electric current to titanium in a soln. are adopted. In this way, the outdoor titanium or titanium allay material excellent in discoloration resistance can be obtd.
|
