Advantages of titanium alloy:
1. High strength
The density of titanium alloy is generally about 4.51g/cm3, which is only 60% of steel. The density of pure titanium is close to the density of ordinary steel. Some high-strength titanium alloys exceed the strength of many alloy structural steels.
2. High thermal intensity
The service temperature is several hundred degrees higher than that of aluminum alloy. It can still maintain the required strength at medium temperature. It can work for a long time at a temperature of 450～500℃. These two types of titanium alloys are still very high in the range of 150℃～500℃. Specific strength, while the specific strength of aluminum alloy decreases significantly at 150°C.
3. Good corrosion resistance
Titanium alloy works in moist atmosphere and sea water medium, its corrosion resistance is far better than stainless steel; it is particularly resistant to pitting corrosion, acid corrosion and stress corrosion.
4. Good low temperature performance
Titanium alloys can still maintain their mechanical properties at low and ultra-low temperatures.
5. High chemical activity
Titanium has high chemical activity, and produces strong chemical reactions with O, N, H, CO, CO2, water vapor, ammonia, etc. in the atmosphere. When the carbon content is greater than 0.2%, hard Tic will be formed in the titanium alloy.
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Disadvantages of titanium alloy:
1. The main limitation of titanium and titanium alloys is their poor chemical reactivity with other materials at high temperatures.
2. Titanium alloy is different from general traditional refining, melting and casting technology, and even often causes mold damage
3. The price of titanium alloy has become very expensive, so it was mostly used in aircraft structures, aircraft, and high-tech industries such as petroleum and chemical industries.
Uses of titanium:
There are two main uses of titanium. One is used in aviation for supersonic aircraft, etc. Mainly use its high specific strength. The main brand is Ti-6Al-4V, the other is used in the civil industry, mainly for its excellent corrosion resistance, and the main brand is industrial pure titanium. More than 90% of my country's titanium is used in the civilian industry, and about 34% of the civilian industrial titanium is used in containers (including heat exchangers). Therefore, my country's container titanium plays a pivotal role in the titanium industry.
The commonly used titanium and titanium alloy materials recommended in the pressure vessel industry mainly include 4 industrial pure titanium (TA0, TA1, TA2, TA3) and 2 corrosion-resistant low-alloy titanium TA9 (Ti-0.2Pd), TA10 (Ti-0.3Mo) -0.8Ni) and 17 other high-strength titanium alloys.
