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What are the differences between industrial pure titanium and titanium alloy

Titanium equipment titanium density is 4.5g/cm3, 57% of steel; Titanium is less than twice as heavy and three times stronger than aluminum. Specific strength is the ratio of strength to density. When compared with different materials, the specific strength of titanium alloy is almost the largest in common industrial alloys. The specific strength of titanium alloy is 3.5 times that of stainless steel, 1.3 times that of aluminum alloy and 1.7 times that of magnesium alloy, so it is an indispensable structural material for aerospace industry. Comparison of density and specific strength of titanium with other metals. The melting point of titanium is high, the thermal conductivity and electrical conductivity is poor, similar to or slightly lower than stainless steel, titanium has superconductivity, the superconducting critical temperature of pure titanium is 0.38.4K. Titanium is a non-magnetic substance.

Titanium alloy is a single-phase alloy composed of phase solid solution, low density, whether at general temperature or at higher actual application temperature, are A phase, stable structure, wear resistance is higher than pure titanium, strong antioxidant ability. At a temperature of 50-600 degrees, it still holds. Its strength and creep resistance, can be strengthened by heat treatment, has good thermal strength and thermal stability, good welding performance, good room temperature, ultra-low temperature and high temperature performance.

Commerial pure titanium is a dense metal titanium containing at least 99% titanium and small amounts of impurities such as iron, carbon, oxygen, nitrogen and hydrogen. The impurities most strongly affecting the mechanical properties of pure titanium are oxygen, nitrogen and iron, especially oxygen. The reaction between hydrogen and titanium is reversible, and the main effect of hydrogen on the performance of titanium is hydrogen embrittlement. It is usually stipulated that the hydrogen content shall not exceed 0.015%, which usually contains.15%-.3% oxygen and 0.03%-.05% nitrogen. Although the industrial pure titanium is a dense hexagonal lattice at room temperature, but its axis is relatively small (C/A =1.587), it has good machinability, good forming and welding performance of pure titanium, and is not sensitive to heat treatment.

In titanium metal, including titanium sheet, titanium rod, titanium tube and so on, including pure titanium and titanium alloy these two kinds. The significant difference between pure titanium and titanium alloy is that titanium alloy is added on the basis of pure titanium, such as lAl, M, C(, Sn and so on chemical substances, and it is because of these chemical substances that lead to the difference in the performance of the two titanium metals. The following Xiaobian focuses on the analysis of the classification, performance and use of pure titanium.

1. Classification of pure titanium:
According to the impurity content, titanium can be divided into high purity titanium (purity up to 999%) and industrial pure titanium < (purity up to 99.5%). Industrial pure titanium has three grades, respectively with TA+ serial number 1, 2, 3, the larger the number, the lower the purity.

2. The performance of pure titanium:
Ti: 4.507 g/cm3, Tm:1688℃. With isotropic transition, <882.5C is α phase with dense hexagonal structure, and 2882.5C is β phase with body-centered cubic structure.

Pure titanium has low strength, but high specific strength, good plasticity, low temperature toughness, and high corrosion. Titanium has good pressure machining performance, but poor cutting performance. Titanium can burn when heated in nitrogen, so it should be protected by hydrogen when heated and welded.

3. The use of pure titanium:
The impurity content has a great influence on the performance of titanium, a small amount of impurities can significantly improve the strength of titanium, so the industrial pure titanium strength is high, close to the level of high strength aluminum alloy, mainly used to manufacture petrochemical heat exchangers, reactors, ship parts, aircraft skin and so on at temperatures below 350℃C.
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