New method and equipment for smelting and casting of titanium and titanium alloy

When the hydrogen content in titanium pipe fittings is too high, the impact toughness and notched tensile strength will be reduced due to brittleness. Therefore, it is generally stipulated that the hydrogen content in titanium pipe fittings should not be higher than 0.015%. In order to reduce hydrogen absorption, fingerprints, wear marks, grease and other residues should be cleaned up before heat treatment. There is no steam in the heat treatment furnace. When the hydrogen content of titanium pipe fittings is higher than the allowable value, vacuum annealing 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 increase, and the internal diffusion layer of the oxide material will become a layer of pollution. The oxygen contamination layer has a high brittleness ratio, which leads to cracks and damage on the surface of the part. Deoxidation pollution layer includes mechanical processing, pickling, chemical polishing and other methods. During the heat treatment, under the premise of protecting the heat treatment, shorten the heating time as much as possible. 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 reduced.

Features of titanium pipe fittings:

1. Corrosion resistance of titanium pipe fittings. Titanium is a very active metal, which has a very low equilibrium potential and a strong tendency for thermodynamic corrosion 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 600 degrees or high temperature.

3. Non-magnetic, non-toxic, titanium alloy pipe fittings are non-magnetic metals that will not be magnetized in a large magnetic field.

4. Low modulus of elasticity, 57% steel.

5. Inhalation performance. Titanium pipe fittings are an active metal, which can react with a variety of elements and compounds at high temperatures.
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