Characteristics and performance analysis of titanium coil tube and titanium u-shaped heating tube
Advantages of titanium coil:
1) excellent corrosion resistance in many media
2) the surface is bright and clean, without scale layer
3) low density, high strength, and therefore light weight
Titanium heat exchanger
Ten properties of titanium in titanium coil:
1) low density, higher than strength
The density of titanium is 4.51g/cm3, higher than aluminum but lower than steel, copper and nickel.
2) corrosion resistance
Titanium is a very active metal.It has a low equilibrium potential and a high thermodynamic corrosion tendency in the medium.But in fact, titanium in oxidation, neutral and weak reducibility and other media is very stable, corrosion resistance.This is because titanium and oxygen have a strong densification force, in oxygen-containing air or medium, the surface of titanium forms a dense, strong adhesion and inert oxide film, to protect the titanium matrix from corrosion.Even due to mechanical wear and tear, it can restore itself or restore.This indicates that titanium is a metal with a strong passivation tendency, and titanium oxide films with a medium temperature below 315 ° c have maintained this property.
In order to increase the corrosion resistance of titanium, surface treatment techniques such as oxidation, electroplating, plasma spraying, ion nitriding, ion implantation and laser treatment were developed to increase the protection of titanium oxide film and achieve the expected corrosion resistance.In order to meet the needs of metal materials such as sulfuric acid, hydrochloric acid, methylamine solution, high temperature wet chlorine and high temperature chloride, a series of corrosion resistant titanium alloys such as titanium-molybdenum, titanium-palladium and titanium-nickel were developed.Titanium casting is made of titanium 32 molybdenum alloy.Ti-0.3 molybdenum-0.8 nickel alloy or ti-0.2 palladium alloy is locally used in the environment where crevice corrosion or pitting often occurs and good efficiency is obtained.
3) good heat resistance
The new titanium alloy can be used at 600℃ or higher for a long time.
4) good low temperature resistance
Titanium alloy TA7 (ti-5 al-2.5sn), TC 4(ti-6 al-4v) and ti-2.5 zr-1.5 Mo are representative of low-temperature titanium alloys. Their strength increases with the decrease of temperature, but their plasticity changes little.At the low temperature of -196-253℃, it maintains good ductility and toughness and avoids the cold brittleness of metal. It is an ideal material for cryogenic vessels, storage tanks and other equipment.
5) good damping resistance
Compared with steel and copper, titanium has a longer vibration attenuation time when it is subjected to mechanical and electrical vibration.This property of titanium can be used as tuning fork, vibration element of pulverizer and vibrating film of audio speaker.
6) no magnetism, no pollution
Titanium is a non-magnetic metal that will not be magnetized in a large magnetic field.It has no pollution and good compatibility with human tissues and blood.
7) the tensile strength is close to its yield strength
This property indicates that the yield strength of titanium is higher than that of (tensile strength/yield strength), which indicates that the plastic deformation of titanium metal in the forming process is poor.The ratio of yield degree to elastic modulus of titanium is large, which makes titanium elastic in the forming process.
8) good heat transfer performance
Although the thermal conductivity of titanium metal is lower than carbon steel and copper, its wall thickness can be greatly reduced due to its excellent corrosion resistance. The heat transfer between the surface and the steam is in the form of drip condensation, which reduces the heat group. If cooling is carried out on the surface, the heat group can also be reduced.Due to the absence of scale on the surface, the heat transfer performance of titanium can be significantly increased.
9) low elastic modulus
The elastic modulus of titanium is 106.4gmpa at room temperature, which is 57% of that of steel.
10) inspiratory performance
Titanium is a very active metal that reacts with many elements and compounds at high temperatures.Titanium inhalation mainly refers to the reaction with carbon, hydrogen, nitrogen and oxygen at high temperature.