During the manufacturing process of titanium tube parts, the companys engaging in the processing of titanium tubes, will encounter many difficulties and obstacles. Among them, the hydrogen content in the titanium tube is a key factor that needs to be paid close attension to. When the hydrogen content in the titanium tube parts is too much, there is a decrease in impact toughness and notch tensile strength due to an increase in brittleness so it will have a significant negative effect on its performance. Generally there is a strict stipulation that the hydrogen content in the titanium tube parts should not exceed 0.015%, which will ensure the quality and performance of the titanium tube parts. The following passage will briefly analyze what should notice when the hydrogen content is too high.
Preparations before processing
Before heat treatment, the comprehensive and meticulous cleaning work of the titanium pipe fittings must be carried out. Various residues such as fingerprints, scratches, grease could all be sources of hydrogen absorption. Therefore, to ensure that all these substances are completely removed in advance, can reduce the hydrogen absorption of the titanium pipe components in the following processing steps.
Control the heat treatment environment
During the heat treatment for titanium pipes, the environment in the furnace is very important for the quality of titanium pipes. There must be no water vapor present in the heat treatment furnace, otherwise water vapor will increase the hydrogen absorption of titanium pipes. If the hydrogen content of the titanium pipe parts has exceeded the normal value, then vacuum annealing should be adopted for treatment to remove the extra hydrogen.
Oxidation and contamination issues in high-temperature heat treatment
When the heat treatment temperature does not exceed 540 degrees, the oxide film on titanium pipe parts will not significantly thicken. However, at higher heat treatment temperatures, the oxidation rate will significantly accelerate, and an internal diffusion layer of oxidized materials will form a layer of contamination. This oxygen contamination layer has a high brittleness ratio and is prone to causing cracks and damage on the surface of the parts. To remove this deoxidation contamination layer, methods such as mechanical processing, acid washing, and chemical grinding can be used. At the same time, while ensuring the effectiveness of the heat treatment, the heating time should be shortened as much as possible. And then, the heat treatment done in vacuum furnaces or inert gas furnaces should be the priority selection, and minimize or avoide contact with air when heating the titanium pipe parts, so as to reduce or avoid the contamination caused.
In conclusion, during the processing of titanium pipes, the completeness of the preparatory work, the level of hydrogen content, and the duration of contact with oxygen all can affect the quality of the titanium pipes. Therefore, only by operating strictly according to the correct methods can we better utilize its advantages in the application field, and improve efficiency and benefits.
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