What Are The Advantages Of Titanium Tubes?
Titanium pipe is a new type of metal material, which has completely replaced traditional iron pipes and steel pipes in some aspects. So, what is it that allowed it to quickly replace traditional tubes? Let's take a look.
The advantages of titanium tubes:
1. The specific strength of titanium tube is high. The density of titanium alloy is generally about 4.5g/cm3, which is only 60% of steel. The strength of pure titanium is close to that of ordinary steel. Some high-strength titanium alloys exceed the strength of many alloy structural steels. Therefore, the specific strength (strength/density) of titanium alloy is much greater than that of other metal structural materials, and parts and components with high unit strength, good rigidity and light weight can be produced. At present, titanium alloys are used in engine components, skeletons, skins, fasteners and landing gears of aircraft.
2. Titanium tubes have high thermal strength. The service temperature is several hundred degrees higher than that of aluminum alloy, and it can still maintain the required strength at medium temperature, and can work for a long time at a temperature of 450-500°C. These two types of titanium alloys still have high strength in the range of 150°C-500°C. Specific strength, while the specific strength of aluminum alloy decreases significantly at 150 °C. The working temperature of titanium alloy can reach 500°C, while that of aluminum alloy is below 200°C.
3. Titanium tubes have good corrosion resistance. Titanium alloy works in humid atmosphere and seawater medium, and its corrosion resistance is far superior to that of stainless steel; it has particularly strong resistance to pitting corrosion, acid corrosion, and stress corrosion; it is resistant to alkali, chloride, chlorine, organic substances, nitric acid, and sulfuric acid. etc. have excellent corrosion resistance. However, titanium has poor corrosion resistance to media with reducing oxygen and chromium salts.
4. The low temperature performance of titanium tube is good. Titanium alloys can still maintain their mechanical properties at low and ultra-low temperatures. Titanium alloys with good low-temperature performance and extremely low interstitial elements, such as TA7, can maintain certain plasticity at -253°C. Therefore, titanium alloy is also an important low-temperature structural material.
5. Titanium tubes have high chemical activity. Titanium has high chemical activity and has 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; when the temperature is high, it will also form a hard TiN surface layer when it interacts with N; when it is above 600 ° C, titanium absorbs oxygen to form a hardened layer with high hardness ; When the hydrogen content rises, an embrittlement layer will also be formed. The chemical affinity of titanium is also large, and it is easy to cause adhesion with the friction surface.
6. The thermal conductivity and elastic modulus of the titanium tube are small. Titanium has small thermal conductivity and small elastic modulus. The elastic modulus of titanium alloy is about 1/2 of that of steel, so its rigidity is poor and easy to deform. It is not suitable for making slender rods and thin-walled parts. Very large, about 2 to 3 times that of stainless steel, causing severe friction, adhesion, and bond wear on the flank of the tool.
