The titanium tube is heat-treated to remove residues

When the hydrogen content in the titanium tube is too much, the impact toughness and notched tensile strength will drop sharply due to brittleness. Therefore, it is generally stipulated that the hydrogen content in the titanium tube should not exceed 0.015%. In order to reduce the amount of hydrogen absorption, fingerprints, rolling mill marks, grease and other residues should be removed before heat treatment. There is no moisture in the atmosphere of the heat treatment furnace. If the hydrogen content of the titanium tube exceeds the allowable value, it must be removed by vacuum annealing. Vacuum annealing for dehydrogenation is generally held at 538-760°C and pressure lower than 0.066Pa for 2-4 hours.

When the temperature does not exceed 540°C, the oxide film on the surface of the titanium tube will not be significantly thickened. At higher heat treatment temperatures (above 760°C), the oxidation rate will increase rapidly, and oxygen can expand into the material to form a diffusion layer— Pollution layer. The high brittleness ratio of the oxygen contamination layer causes cracks and damage on the surface of the part. There are mechanical processing methods (such as sandblasting, house cutting, etc.) or chemical methods such as pickling and chemical milling to remove the oxygen pollution layer. During the heat treatment, the heating time should be as short as possible while ensuring the heat treatment of the meteorite. It is carried out in a vacuum furnace or an inert gas (argon, nitrogen, etc.) heating furnace. The appropriate application can also avoid or reduce the pollution caused by the titanium tube parts being heated in the air furnace.

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