Application function of titanium plate and titanium alloy plate in the petrochemical industry

Titanium alloy plates and titanium plates are mainly used to manufacture various vessels, reactors, heat exchangers, distillation towers, pipes, pumps and valves in the petrochemical machinery manufacturing industry. Titanium can be used as a condenser for titanium cathodes and power stations and as an environmental pollution control device. The hardness of steel is higher than that of titanium plate, but the specific strength or tensile strength of titanium alloy is higher than that of high-quality steel. Titanium alloys have good heat resistance, low-temperature toughness and fracture toughness, so they are mostly used as aircraft engine parts and rocket and missile structural parts. Titanium alloys can also be used as fuel and oxidant storage tanks and high-pressure containers. Titanium alloys are now used to manufacture automatic rifles, mortar seat plates, and launch tubes for recoilless guns.

1. Memory function

Titanium-nickel alloys have unidirectional, bidirectional and omnidirectional memory effects at certain ambient temperatures and are recognized as the preferred memory titanium alloys. It is used in engineering to make pipe joints for the oil pressure system of fighter jets; oil pipeline system of petroleum joint enterprises; 500mm diameter parabolic mesh antenna made of 0.5mm diameter wire is used in aerospace vehicles; it is used to make snoring in medical engineering Treatment; screws made of titanium plates are used for fracture healing. The above applications have achieved obvious results.

2. Superconducting function

The niobium-titanium plate exhibits a superconducting function with zero resistance when the temperature is lower than the critical temperature.

3. Hydrogen storage function

Titanium-iron alloys have the property of absorbing hydrogen. They store large amounts of hydrogen safely and release it in a certain environment. This is very promising in applications such as hydrogen separation, hydrogen purification, hydrogen storage and transportation, manufacturing of heat pumps and batteries that use hydrogen as an energy source.

The titanium oxide, titanium dioxide, is a snow-white powder and a good white pigment, commonly known as titanium white. In the past, people mine titanium ore, the main purpose is to obtain titanium dioxide. Titanium white has strong adhesion, is not easy to change chemically, and is always white. Especially valuable is that titanium dioxide is non-toxic. It has a high melting point and is used to make refractory glass, glaze, enamel, clay, high-temperature resistant laboratory utensils, etc.

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Titanium alloy-the difference between butt welded titanium flange with neck and flat welded titanium flange with neck

There are three main points:
1. The welding seam forms are different: the welding seam form of the titanium flange pipe with neck flat welding and the titanium flange is a fillet weld, and the welding seam form of the neck welding neck flange and the pipe is a circular weld;
2. The materials are different: the material of the neck welded flange is made of ordinary titanium plate with a thickness that meets the requirements, and the material of the neck welded flange is mostly machined from titanium forgings;
3. Different nominal pressures: the nominal pressure of the neck-welded flange is: 0.6---4.0MPa, while the nominal pressure of the neck-welded flange is: 1--25MPa;
4. One more point, the welding seam with the neck butt welding flange and the connecting pipe belongs to category B seam, and the welding seam with the neck flat welding flange and the connecting pipe belongs to category C seam, and the non-destructive testing after welding is different;
5. The flat welded flange with neck and the butt welded flange with neck can not be replaced casually. In terms of manufacturing angle, the large internal welded flange with neck (SO is the abbreviation of SLIP ON) means that the weight is small and the cost is low. In addition Welding flanges with necks with a nominal diameter greater than 250mm (WN is the abbreviation of WELDING NECK) to be tested, SO flanges do not need to be tested, so the cost is low.
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Analysis of the forging process of titanium alloy GR5 material

Because of its high strength, corrosion resistance, high specific strength, wear resistance, high-temperature resistance, low-temperature resistance, non-magnetic properties, biophilic, and rich resources, titanium and titanium alloys have been favoured by all walks of life this year.

And gradually in oil drill pipe, oil exploration, oil drilling platform, vacuum coating, mining equipment, coal chemical equipment, pressure equipment accessories, high-temperature equipment accessories, deep-sea detection equipment accessories, wear-resistant equipment accessories, corrosion-resistant equipment accessories, gas Drilling equipment, sports equipment, automobiles, motorcycles, computers, mobile phones and other high-pressure resistant, wear-resistant, corrosion-resistant fields have been widely used and popularized.

The cleaning technology of titanium alloy forgings has two aspects: one is the removal of oxide scale; the second is the removal of α shell. Rust can be removed by mechanical methods, such as sandblasting; or chemical methods, such as molten salt derusting. The choice of rust removal method depends on the size, complexity and cost of the part.

Sandblasting is an effective method to remove rust. It can remove rust from 0.13 to 0.76mm thick. 100 to 150 mesh zircon sand or steel sand can be used. The air pressure can reach 275Pa. Although sandblasting can be used for forgings of various sizes, it is mostly used for medium and large titanium alloy forgings. Sandblasting equipment can use drums, shot blasting or sandblasting devices equipped with abrasives. After sandblasting, pickling is required to remove the alpha shell.

Dissolved salt rust removal is another effective method for removing scale, and the alpha shell is also removed by acid pickling. First, the flow chart of solution salt removal and pickling, solution composition and related parameters are usually used. The racks used for dissolving salt to remove rust are generally made of wood, titanium or stainless steel to prevent the generation of electric potential between the workpiece and the rack, which may cause electrical erosion or arcing of the workpiece. Molten salt descaling is often used in small and medium-sized forgings. In the case of large-scale forgings, the operating system can be fully automated.

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To introduce you to the performance of titanium alloy pipe products:

Product performance:

1. Excellent corrosion resistance in many media

2. Small density, high strength, equipment weight

3. The surface is smooth and free of dirt, the dirt coefficient is greatly reduced

Executive standards and materials: HG/T3651-99 GB/T12459, GB/T13401, etc.

Titanium pipe use: widely used in petroleum, chemical industry, electric power, metallurgy, chemical fibre, food, pharmaceutical, Chlor-alkali, vacuum salt production, fine chemical industry, biological engineering, seawater desalination, marine engineering and other industries.

Product packaging: wooden box packaging, suitable for long-distance transportation.

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Metal corrosion of heat exchanger:

The principle of metal corrosion: Metal corrosion refers to the destruction of metal under the action of chemical or electrochemical surrounding media, and often under the joint action of physical, mechanical or biological factors, that is, the metal in its environment The damage caused by the effect.

Several common types of corrosion damage of heat exchangers:

1. Uniform corrosion, which occurs on the entire surface exposed to the medium or on a larger area. Macroscopically uniform corrosion damage is called uniform corrosion.

2. Contact corrosion. Two metals or alloys with different potentials are in contact with each other and immersed in the electrolyte solution. When there is current between them, the corrosion rate of metals with positive potential decreases and the corrosion rate of metals with negative potential increases.

 3. Selective corrosion. The phenomenon that a certain element in the alloy preferentially enters the medium due to corrosion is called selective corrosion.

4. The pitting corrosion is concentrated on the individual small spots on the metal surface. The deeper corrosion is called pitting corrosion, or small hole corrosion, pitting corrosion.

5. Crevice corrosion, there will be severe crevice corrosion in the crevices and covered parts of the metal surface.

6. Scour corrosion, scour corrosion is a kind of corrosion that accelerates the corrosion process due to the relative movement between the medium and the metal surface.

7. Intergranular corrosion. Intergranular corrosion is a kind of corrosion that preferentially corrodes the grain boundaries of metals or alloys and the areas near the grain boundaries.

8. Stress corrosion cracking (SCC) and corrosion fatigue SCC is a material fracture caused by the combined action of corrosion and tensile stress in a certain metal-medium system.

9. Hydrogen destruction. Metals in electrolyte solutions can be damaged due to hydrogen penetration due to corrosion, pickling, cathodic protection or electroplating.

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Application of titanium in transplantation

In medical transplant operations, artificial joints and artificial bone substitute materials should have the following basic characteristics: light weight, high strength, biocompatibility, corrosion resistance, and tissue reactions that occur in the body of the implant will not cause Material degradation, fatigue and damage caused by repeated stress are few. The more important properties of metal implants are formability, machinability and polishability. They must maintain function during the expected lifetime and will not deteriorate when subjected to fatigue, wear, corrosion and impact loads... Titanium and titanium alloy materials Appears to satisfy all the above requirements. Dental tray powder, polypropylene, plexiglass and other artificial joint materials used earlier have low strength, easy to fold, and poor biocompatibility. Later, they were changed to stainless steel. However, stainless steel not only corrodes and breaks in the body's receptor fluid, but also has a large specific gravity, which is about twice that of human bones. Co-Cr alloy is also an excellent artificial joint material, but unfortunately, cobalt and chromium are toxic to the human body. Titanium and titanium alloys have a small specific gravity (similar to that of human bones), high strength, good mechanical processing, and excellent corrosion resistance. They naturally become a new and ideal artificial joint material.

The titanium materials prescribed for surgical implant materials are mainly pure titanium and Ti-6Al-4VELI alloy. In recent years, the graft materials Ti-13Nb1-13Zr and Ti-6Al-7Nb, which have good affinity with the human body, have also been approved by ASTM standards. Artificial bones and bone joints made of titanium can be regenerated on the cells without affecting bone growth, and have good affinity with human bones, epithelium and tissues.

At present, titanium and titanium alloys have been widely used in artificial bones, artificial bone joints, joint foot plates, broken bone fixators, intramedullary nails, artificial heart valves, skull bones, etc. According to incomplete statistics, China's annual demand for titanium alloy artificial joints exceeds 5,000 sets, and clinical applications have received good results.

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The appearance and quality of titanium welded pipe are better than titanium seamless pipe

Titanium welded pipe is welded by cold-rolled coil, with uniform wall thickness, good concentricity, good finish, and no scaling in the pipe. Especially for thin-walled titanium tubes, it is impossible to meet its technical requirements with a seamless rolling process. 

After the rolling or drawing process of titanium seamless pipe, it is difficult to achieve a wall thickness of less than 1 mm; while titanium welded pipe can achieve a wall thickness of 0.5 mm or less, saving a lot of materials and costs. At the same time, due to the thinner wall thickness of the titanium welded pipe, a higher heat transfer coefficient can be obtained and a better heat transfer effect can be obtained.

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