Titanium tube is removed by heat treatment method sunrui Titanium alloy valve

Titanium tube is removed by heat treatment method other substances

When excessive hydrogen content of titanium tubes , sunrui Aerospace titanium castings become brittle leaving notched impact toughness and tensile strength of a sharp decline in the general provisions of the hydrogen content of titanium tubes shall not exceed 0.015% . To reduce the amount of hydrogen absorption , parts should be removed prior to heat treatment fingerprints, rolling mill mark , grease and other residue , no vapor heat treatment furnace atmosphere . If the hydrogen content of titanium tube exceeds the allowable value , must be removed by vacuum annealing . Dehydrogenase is generally vacuum annealing at 538-760 ℃, maintained under a pressure lower than 0.066Pa 2-4h.

    When the temperature does not exceed 540 ℃ , the titanium oxide film surface of the tube does not significantly thickened , however, the heat treatment at higher temperature (760 ℃ above ) , the oxidation rate is sunrui aerospace castings rapidly increased, and the oxygen expansion inside material to form a diffusion layer - contaminated layers. Oxygen contamination layer has a high ratio 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 . sunrui Titanium precision castings Application of appropriate Xu Min can avoid or reduce contamination titanium tube furnace parts heating in air generated .