the titanium alloy film surface of the tube

 When the temperature does not exceed 540 ℃ , the  titanium alloy film surface of the tube does not significantly thickened , however, the heat treatment at higher temperature (760 ℃ above ) , the oxidation rate is rapidly increased, and the oxygen expansion inside material to form a diffusion layer - contaminated layers. Oxygen contamination layer has a high  titanium sheets  leads to brittle parts of the surface cracks and damage. Removing contaminated layers of oxygen with mechanical processing methods ( such as room cut , sandblasted , etc. ) , or pickling, chemical milling and other chemical methods , in the heat treatment , the heating time should be guaranteed under the premise of the heat treatment is shortened as much as possible meteorite , but also in performed in a vacuum furnace or an inert gas (argon , nitrogen, etc. ) furnace . Application of appropriate Xu Min can avoid or reduce contamination titanium tube furnace parts heating in air generated .