How is titanium tube heat treated to remove residue?
How is titanium tube heat treated to remove residue
When the hydrogen content in the titanium tube is too high, the impact toughness and notched tensile strength will drop sharply due to embrittlement, so 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, the parts should be free of fingerprints, rolling mill marks, grease and other residues before heat treatment, and there is no moisture in the heat treatment furnace. If the hydrogen content of titanium pipe fittings exceeds the allowable value, it must be removed by vacuum annealing
When the temperature does not exceed 540 degrees, the oxide film of Titanium Square Tube will not be significantly thickened, but at a higher heat treatment temperature, the oxidation rate will be rapidly accelerated, and a contamination layer will be formed in the diffusion layer inside the oxidized material. The oxygen contamination layer has a high brittleness ratio that leads to cracks and damage on the surface of the part. There are mechanical processing methods, pickling, chemical milling and other chemical methods for deoxidizing the pollution layer. During heat treatment, the heating time should be shortened as much as possible under the premise of ensuring the heat treatment. It can also be carried out in a vacuum furnace or an inert gas heating furnace. . The pollution generated when the titanium alloy pipe is heated in the air furnace should be properly avoided or reduced.
