When the hydrogen content in titanium pipe fittings is too high, the impact toughness and notch tensile strength will decrease due to brittleness. Therefore, it is generally stipulated that the hydrogen content in titanium pipe fittings should not exceed 0.015%. To reduce hydrogen absorption, fingerprints, abrasions, grease, and other residues should be cleaned before heat treatment. There is no water vapor in the heat treatment furnace. When the hydrogen content of titanium pipe fittings exceeds the allowable value, vacuum annealing cleaning is required.
When the temperature is not higher than 540 degrees, the oxide film of titanium pipe fittings will not become much thicker, but at higher heat treatment temperatures, the oxidation rate will accelerate, and the internal diffusion layer of the oxidized material will become a layer of pollution. The oxygen pollution layer has a high brittleness ratio, leading to cracks and damage on the surface of the parts. The deoxygenation pollution layer includes methods such as mechanical processing, acid washing, and chemical grinding. During heat treatment, while protecting the heat treatment, try to shorten the heating time as much as possible. It can also be carried out in a Vacuum furnace or an inert gas furnace, and the pollution caused by the heating of titanium pipe fittings in the air furnace should be properly avoided or reduced.
Features of titanium pipe fittings:
1. Corrosion resistance of titanium pipe fittings. Titanium is a highly active metal with a low equilibrium potential and strong thermodynamic corrosion tendency in the medium. Titanium has good stability and corrosion resistance in various media such as oxidation, neutrality, and weak reduction
2. Titanium pipe fittings have good heat resistance. It can be used for a long time at temperatures of 600 degrees or higher.
3. Non magnetic, non-toxic, titanium alloy pipe fittings are non magnetic metals that will not be magnetized in high magnetic fields.
4. Low elastic modulus, 57% steel.
5. Inhalation performance. Titanium pipe fittings are an active metal that can react with various elements and compounds at high temperatures.
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