What are the advantages of titanium tube?
Titanium tube is a new type of metal material, in some aspects has completely replaced the traditional iron pipe, steel pipe. So what makes it so quick to replace the traditional tube? Let's take a look.
The advantages of titanium tubes are:
1. The specific strength of titanium tube is high. The density of titanium alloy is generally about 4.5g/cm3, only 60% of steel. The strength of pure titanium alloy is close to that of ordinary steel, and some high-strength titanium alloys exceed the strength of many alloy structural steels. Therefore, the specific strength of titanium alloy (strength/density) is much greater than other metal structural materials, can be made of high unit strength, good rigidity, light weight zero, components. Titanium alloys are used in aircraft engine components, frames, skins, fasteners and landing gear.
2. Titanium tube has high thermal strength. The use of temperature is several hundred degrees higher than aluminum alloy, in the medium temperature can still maintain the required strength, can be in 450 ~ 500℃ temperature for a long time working these two types of titanium alloy in the range of 150℃ ~ 500℃ still has a high specific strength, and aluminum alloy at 150℃ specific strength decreased significantly. The operating temperature of titanium alloy can reach 500℃, and that of aluminum alloy is below 200℃.
3. The corrosion resistance of titanium tube is good. Titanium alloy works in humid atmosphere and seawater medium, its corrosion resistance is much better than stainless steel; Resistance to pitting corrosion, acid corrosion, stress corrosion is particularly strong; Excellent corrosion resistance to alkali, chloride, chlorine, nitric acid, sulfuric acid, etc. But the corrosion resistance of titanium to reducing oxygen and chromium salt media is poor.
4. Titanium tube has good low temperature performance. Titanium alloy can still maintain its mechanical properties at low and ultra-low temperatures. Titanium alloys with good low temperature performance and very low gap elements, such as TA7, can maintain certain plasticity at -253℃. Therefore, titanium alloy is also an important low temperature structural material.
5. Titanium tube has high chemical activity. The chemical activity of titanium is large, and the atmosphere of O, N, H, CO, CO2, water vapor, ammonia and other strong chemical reaction. When the carbon content is more than 0.2%, hard TiC will be formed in titanium alloy; When the temperature is higher, TiN hard surface will be formed by the action of N. Above 600℃, titanium absorbs oxygen to form a hard layer; With the increase of hydrogen content, embrittlement layer will be formed. Titanium chemical affinity is also large, easy to produce adhesion phenomenon with friction surface.
6. Titanium tube has small thermal conductivity and small elastic modulus. Titanium has small thermal conductivity, small elastic modulus of titanium alloy elastic modulus is about 1/2 steel, so its poor rigidity, easy deformation, not suitable for the production of slender rod and thin wall parts, cutting processing surface of a large amount of springback, about 2 ~ 3 times of stainless steel, resulting in intense friction, adhesion, bonding wear after the tool surface.
