When the hydrogen content in the titanium tube is too high, the brittleness of the titanium tube will reduce the impact of toughness and notched tensile strength of the titanium tube. Therefore, the hydrogen content in titanium pipe joints should not be higher than 0.015%. In order to reduce hydrogen absorption, fingerprints, abrasion marks, grease and other residues should be removed before heat treatment. There is no steam in the heat treatment furnace. When the hydrogen content of the titanium tube is higher than the allowable value, vacuum annealing cleaning is required.
When the temperature is not higher than 540°C, the oxide film will not thicken, but at a higher heat treatment temperature, the oxidation rate of the oxide film will increase, and the internal diffusion layer of the oxide film will become a pollution layer. The oxygen contamination layer has a high brittleness ratio, which causes cracks and damage on the surface of the part. Deoxidation pollution layer includes mechanical processing, pickling, chemical polishing and so on. During heat treatment, the heating time should be shortened as much as possible while protecting the heat treatment. It can also be carried out in a vacuum furnace or an inert gas furnace. The pollution caused by the heating of titanium pipe fittings in the air furnace should be avoided or appropriately reduced.
Features of titanium tube:
1 Corrosion resistance of titanium pipe joints. Titanium is a very active metal with a very low equilibrium potential and a strong tendency to thermodynamic corrosion in the medium. Titanium has good stability and corrosion resistance in oxidizing, neutral and weakly reducing media.
2 Titanium pipe joints have good heat resistance. It can be used for a long time at 600℃ or high temperature.
3Non-magnetic, non-toxic and titanium alloy pipe fittings are non-magnetic metals and will not be magnetized in a large magnetic field.
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