Development characteristics of titanium alloy materials and titanium product processing technology

Due to the high manufacturing cost of titanium alloys, in order to reduce costs, the competitiveness of titanium alloys in the entire metal material market has been improved at a lower price. It is generally believed that titanium has incomparable superior performance compared with other materials, but the price of titanium often discourages consumers (especially automakers). The emergence of high-quality, low-cost titanium alloys will certainly help the popularization and application of titanium and titanium alloys.
Judging from the application status at home and abroad and the development of titanium processing technology, the plastic processing technology of titanium and titanium alloys will develop in the following directions in the future:
1) High performance, that is, the development of alloys with higher service temperature, higher specific strength, higher specific modulus, better corrosion resistance and wear resistance.
2) Multi-function, namely the development of titanium alloys with various special functions and uses, such as high damping, low expansion, constant resistance, high resistance, resistance to electrolytic passivation and hydrogen storage, shape memory, superconductivity, low modulus biomedical Other titanium alloys, and further expand the application of titanium and titanium alloys.
3) Deepen the research of traditional alloys, improve the practical performance of existing alloys, and expand the application range of traditional alloys through the improvement of equipment and processes.
4) Adopt advanced processing technology and large-scale continuous processing equipment to develop continuous processing technology, direct rolling technology, cold forming technology and near-net forming technology to improve the production efficiency, yield and product performance of titanium alloys.
5) Reduce costs, develop alloys that contain no or almost no precious metal elements, and add cheap elements such as iron, oxygen and nitrogen, and develop titanium alloys that are easy to process and shape, easy to cut, and alloy elements and master alloys are cheap. Develop titanium alloys and use banned materials to increase the recovery rate and utilization rate of banned titanium. This is particularly important for reducing the cost of civilian titanium alloys.
6) Use advanced computer technology to simulate the deformation and processing of the workpiece, predict the evolution of the metal microstructure, and even predict the mechanical properties of the product (yield strength, tensile strength, elongation, hardness, etc.). ), and design or improve molds and tooling; analyze and process test results, reduce test volume, improve work efficiency, and reduce development costs.
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Titanium tube has good strength and mechanical properties

Titanium tubes are light in weight, high in strength, and superior in mechanical properties. They are widely used in heat exchange equipment, such as tubular heat exchangers, serpentine tube heat exchangers, condensers, evaporators and transportation pipelines. At present, many nuclear power industries use titanium tubes as standard tubes for their units. The titanium tube is made by an extrusion process, and the welded titanium tube is made by crimping and welding the plate. Generally, seamless titanium pipe has a relatively small wall thickness and a relatively small diameter.
Technical requirements for titanium tube:
1. The allowable deviation of the outer diameter of the pipe meets the requirements of Table 1.
2. The length of the pipe should meet the requirements of Table 2.
3. The allowable deviation of pipe wall thickness should not exceed ±12.5% ​​of its nominal wall thickness. The allowable deviation of pipe wall thickness is not suitable for the weld of titanium welded pipe.
4. The chemical composition of titanium and titanium alloy tubes meets the requirements of GB/T3620.1, and the allowable deviation of the chemical composition meets the requirements of GB/t3620.2 when the buyer re-inspects.
5. Within the range of fixed length or multiple lengths of the pipe, the allowable deviation of the fixed-length is ±10mm, and the multiple lengths should also be included in the cut amount when the pipe is cut. Each cut should be 5mm.
Titanium alloy has high strength, low density, good mechanical properties, toughness and corrosion resistance. In addition, titanium alloys have poor process performance and difficult cutting processing. In hot processing, it is very easy to absorb impurities such as hydrogen, oxygen, nitrogen, and carbon. It also has poor abrasion resistance and complex production processes.
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How to remove the reactive layer of titanium screws

When titanium screws are not subjected to any surface treatment, the color of the entire screw is silver-gray, and it is super common in daily use. Sometimes there are many different colors of titanium screws on bicycles and cars. These colorful titanium screws It is so bright and colorful after a certain surface treatment, let's share with you how to eliminate the reaction layer of titanium screws.
1. Sandblasting
The sand particles are impacted on the surface of the titanium screw, thereby generating intense sparks, and the temperature rise will react with the surface of the titanium screw, forming secondary pollution and affecting the surface quality. It takes 15 to 30 seconds to remove the sticky sand, surface sintered layer and part of the oxide layer on the surface of the casting. The reaction layer on the remaining surface is quickly removed by chemical pickling.
2. Pickling
The use of pickling can quickly and effectively remove the reaction layer on the surface of the titanium screw without causing pollution of other metal elements.
Titanium screws look like steel with a silver-white luster. It is a common transition metal. Pure titanium screws have high strength, low density, high hardness, high melting point and strong corrosion-resistance, so many of them can be used.
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Superplastic forming method of TC4 titanium alloy and titanium alloy plate

Titanium alloy has excellent corrosion resistance, low density, good fatigue strength and resistance to crack growth. TC4 titanium alloy is currently mainly made of titanium plates and titanium rods. The main reason for the current situation is that TC4 titanium alloy has high strength and cold Roll forming is difficult. Titanium alloy's excellent corrosion resistance and good specific strength have broad application prospects in aviation, aerospace, automobile, shipbuilding, energy and other industries.
The superplastic forming method of titanium alloy sheet can be roughly divided into the following three types: (1) vacuum forming; (2) air pressure forming (blow forming); (3) compression forming (coupling die forming). The first two methods are commonly used methods for forming plastic (or glass) products. The superplastic forming of titanium plate is viscous or semi-viscous flow deformation, so low pressure forming can be used. Air pressure forming can also be combined with vacuum forming. Titanium Metal
1. Vacuum forming method
The vacuum forming method can be divided into two types: the convex mold method and the concave mold method.
The punch method is a forming method in which the heated wool is adsorbed on a punch with the inner shape of the part, and is used to form parts that require high inner dimensional accuracy. The die method is a forming force method in which heated wool is adsorbed on a die with the shape of the part. It is used for the forming of parts that require high dimensional accuracy. Generally speaking, the former is used for forming deeper containers, and the latter is used for forming shallower containers.  T40 Titanium Bar
Vacuum forming is also a kind of air pressure forming, but the forming pressure can only be one atmosphere. Therefore, for the titanium plate, only parts with thin thickness, simple shape, and gentle curvature can be formed, and it is not suitable for forming parts with thicker thickness, more complicated shape and severe deformation. titanium forged block
2. Compression molding method
Using coupling mold. The difference from ordinary pressing is that the temperature is high and the molding speed is much slower.
Because it is difficult to manufacture metal coupling molds that can withstand the superplastic temperature of titanium plates, and the matching accuracy is difficult to ensure (especially for molds with complex shapes), superplastic forming of titanium plates is rarely used.
3. Air pressure forming method (blow molding method)
This is a special bulging process.
The traditional bulging process is realized by mechanical, hydraulic bulging or explosive bulging. The pressure and energy used are relatively high, and due to the limitation of material plasticity, the amount of deformation is generally not too large. Blow molding is a kind of forming that can obtain large deformation with low energy and low pressure. It is a sheet metal forming technology that is different from the traditional process concept. Since the metal is free in the deformation process, almost all the power is consumed in the deformation work, and the friction loss is small (for free blow molding, there is no friction loss), which is essentially different from other stamping forming . titanium rectangular rod
Blow molding can be divided into free blow molding and mold blow molding. Mold blow molding is characterized by half-mold molding. Similar to vacuum molding, it is also divided into two types: convex molding and concave molding; the difference is that the molding pressure can be greater than one atmosphere, and it is also suitable for air supply system. The pressure can be adjusted so that parts with complex shapes and large curvature changes can be manufactured.
(1) Free blow molding method
This is the simplest form of blow molding. Its characteristic is that there is no mold, and the typical parts blown are spherical parts.
(2) Punch forming method
This method is to form a closed pressure space on the outside of the titanium plate wool. After the titanium plate is heated to superplastic temperature, under the action of the compressed gas pressure, the wool produces superplastic deformation and gradually approaches the mold surface until it is the same as the mold. Completely fit, make the same parts as the mold surface. The inner surface of the formed part has high dimensional accuracy, accurate shape, large depth and width ratio, and easy mold processing, but it is difficult to demold and raw materials are more expensive. The bottom of the part formed by this method is thicker than the surrounding.
(3) Concave mold forming method
Different from the punch forming method, a closed pressure space is formed inside the titanium sheet wool during the forming process. The outer surface of the formed part has high dimensional accuracy, accurate shape, easy part demolding, less raw materials, but the depth and width are relatively small, and the mold processing is also difficult. The bottom of the part formed by this method is thinner than the surrounding.

What are the applications of titanium wire and titanium alloy wire?

Titanium and titanium alloy materials, as the best among metal materials, have a series of excellent properties that other metal materials can't match. Therefore, they have developed rapidly in recent years and have been rapidly and widely used in high-tech fields such as aerospace and military industry. The United States, Russia, Japan, China and other countries all over the world attach great importance to the research and development of titanium alloys, continue to develop new types of titanium alloy materials, and expand the application of titanium and titanium alloys. Due to continuous in-depth research and an increase in product series, many titanium products, such as titanium alloy wires, have also increasingly entered the fields of various civilian consumer products.
1. Classification of titanium wire
Titanium can be divided into pure titanium and ASTM B265 TA6V Titanium Plate on whether it contains alloying elements, and Titanium Threaded Forged Fitting can be divided into α titanium alloy and near α type alloy, (α + β) type alloy, and near β type according to its composition and room temperature structure. Alloy and β-type alloy. Titanium and titanium alloys can be used to prepare wires with different usage requirements according to different properties. Finished titanium and titanium alloy wires are generally in the hard state (Y) and annealed state (M).
2. Application of titanium wire
Titanium and titanium alloys have good corrosion resistance, high specific strength, non-magnetic, high biocompatibility, low impedance to ultrasonic waves, high sound transmission coefficient, hydrogen storage and better shape memory functions. The excellent characteristics of important use value have produced important applications in many fields such as aerospace, petrochemical, medical and health, automobiles, construction, and sports and leisure products.
Titanium and Gr2 Polished Titanium Wire, as an important variety of titanium material series, has made great progress in terms of output, specifications and applications. Generally speaking, titanium and titanium alloy wires refer to titanium products supplied in the form of discs, and some are supplied in the form of straight wires. As far as the diameter is concerned, the division of rods and wires is not strict and varies among countries. And in recent years, due to its continuous development, the variety is becoming more and more, which provides more options for its application in high-performance industrial supplies and consumer products.

Analysis of temperature reduction of the plate heat exchanger?

Before the supersaturated sodium aluminate liquid enters the seeding tank for decomposition, the liquid needs to be cooled in the production of alumina. The temperature of the slurry that enters the seeding tank after mixing with the refined seed meets the requirements of the decomposition process (5663℃). Aluminum hydroxide with high decomposition rate, coarse particle size and good quality. A factory uses Bayer's method to produce alumina. The original design of the sodium aluminate liquid cooling process is a plate heat exchanger and vacuum cooling in series. Later, the floating liquid in the mother liquid of the vertical plate was recovered, and the plate heat exchanger was changed and transformed to form a liquid cooling process in which the plate heat exchanger is connected in series and then connected in series with the vacuum cooling. At the same time, the temperature of the mother liquid of the riser as a cold phase for heat exchange has been greatly increased, and good conditions have been invented for reducing the steam consumption in the evaporation process. High Quality Titanium Wire
Stacked at intervals. The edges between the plates are sealed with gaskets, and the plate heat exchanger is made of thin metal plates that are corrugated while forming a narrow flow channel. The cold and hot fluids flow on both sides of the plate, and exchange heat through the metal plates. The four corners of the plate are provided with flow channel holes, which constitute a fluid distribution pipe and a collecting pipe. The two ends of the whole equipment are tightly sealed with movable end caps and fixed end caps. The gap between the plates is 26mm. astm b348 titanium bar
The main advantage of the plate heat exchanger is that when the fluid flows on the corrugated surface, it changes the flow direction from time to time, destroying the stagnation flow and forming Artificial turbulence makes the medium reach turbulent flow at a low flow rate. The heat transfer coefficient is large, the structure is compact, and the heat transfer area per unit volume is large. It has a 2501250m2 heat transfer area per cubic meter volume. It is very convenient to disassemble, clean, overhaul, increase or decrease the plate to adjust the heat transfer area, and the operation flexibility is great. Gr9 Titanium Seamless Tubes For Bike Frame
But the flow channel of the medium is narrow and easy to block. The heat dissipated by the hot phase of the plate heat exchanger is transferred to the cold phase through the corrugated metal thin plate so that the cold phase absorbs the heat and the energy is utilized. The boiling temperature is low, and the vacuum cooling is based on the relationship between the boiling temperature and pressure of the solution in a closed container. Low pressure. Under vacuum, the boiling temperature is lower than that under normal pressure. The higher the vacuum, the lower the boiling temperature.  Titanium Planar Sputtering Target
When the high-temperature sodium aluminate liquid enters the vacuum container, because its own temperature is higher than the boiling temperature under the vacuum condition, the liquid achieves the purpose of lowering the temperature while performing self-evaporation. The evaporated gas is condensed by circulating cooling water and then cooled by circulation The water circulates and the liquid is concentrated and cooled. In the vacuum cooling process, part of the self-evaporated heat is taken away with the circulating cooling water and released to the air in the circulating water tower; the other part is discharged into the air with the vacuum pump. The heat of liquid self-evaporation is not reused.

What are the common specifications of titanium screws?

What are the common specifications of titanium screws? Today: just share for you
Screws are indispensable industrial necessities in daily life: such as the smallest screws used in cameras, glasses, clocks, electronics, etc.; general screws for TVs, electrical products, musical instruments, furniture, etc.; for engineering, construction, and bridges, large screws are used, Nuts; transportation appliances, aircraft, trams, cars, etc. are used in combination with small and large screws. Screws have important tasks in the industry. As long as there is an industry on the earth, the function of screws is always important.
Products: Titanium screws, titanium bolts, Titanium Hex Nut, titanium screws
Material: TA1, TA2, TC4, Gr1, Gr2, Gr5
Specification: M4～M25×L
Standard: GBDINISO.
1. titanium metric screw: round head screws, self-tapping screws, hexagonal screws, countersunk head screws, flat head screws, square head screws, double head screws, non-standard screws, fastening screws, standard screws, flat head screws
2. titanium u bolt: external hexagon bolts, square neck bolts, semi-circular head bolts, countersunk head bolts, carriage bolts, bushing combination bolts, various instrument lathe bolts, special-shaped non-standard bolts Uses: electroplating, aluminum oxidation (anodic decomposition ), chemical industry, watch industry, medicine, breeding, electronic hardware, plastics and other industries.
3. Titanium Wing Nut, hexagonal nuts, self-locking nuts, ring nuts, knurled nuts, slotted nuts, hexagon nuts for precision machinery, and special-shaped non-standard nuts.

Characteristics of titanium tube heat exchanger

The heat exchanger is an indispensable device for heat exchange and transfer in the chemical production process. There are often some corrosive and oxidizing materials in the heat exchange, and the materials for manufacturing spiral plate heat exchangers are required to have strong corrosion resistance.

Finned titanium tube heat exchanger is also called tube fin heat exchanger. Its structural feature is that there are many fins on the outer or inner surface of the heat exchanger tube. Commonly used fins are longitudinal and horizontal. Titanium finned tube heat exchangers are used as air coolers and are widely used in industry. wide. The use of air instead of water cooling can not only be used in water-scarce areas, but also in places where there is sufficient water source, the use of air cooling has also achieved greater economic benefits. Of course, the addition of fins will increase the equipment cost, but generally when the ratio of the convective heat transfer coefficient of the two fluids exceeds 3:1, it is economically reasonable to use finned titanium tube heat exchangers. The connection between the fins and the tube surface should be tight, otherwise the contact thermal resistance at the connection is very large, affecting the heat transfer effect. Commonly used connection methods include hot sleeve, inlay, tension winding and welding. In addition, the finned tube can also be manufactured by integral rolling, integral casting, or machining. Gas heating and cooling problems are often encountered in chemical production. Because the convective heat transfer coefficient of the gas is very small, when another fluid that exchanges heat with the gas is water vapor condensation or cooling water, the gas side thermal resistance becomes the heat transfer control factor. To strengthen heat transfer at this time, it is necessary to increase the convective heat transfer area on the gas side. Fins are provided on the gas side of the heat exchange tube, which not only increases the heat transfer area on the gas side, but also enhances the degree of gas turbulence, reduces the thermal resistance on the gas side, and thus increases the gas heat transfer coefficient.

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Application characteristics of titanium alloy plates, titanium alloy rods and other titanium alloy materials in the field of aviation

Titanium alloy has excellent properties such as low density and high strength, and is an ideal aerospace structural material. At present, the application of titanium alloy in the aerospace industry has been favored by people for more and more months.

Titanium alloy has the highest tensile plasticity and can be welded in various ways. The long-term use temperature can reach up to 250 degrees Celsius. It is mainly used to manufacture various low-strength Bancun structural parts on aircraft and engines. Industrial pure titanium has good plasticity, can form various sheet stampings in the cold state, and has high corrosion resistance. The Ti5Al2.5Sn titanium alloy has a moderate room temperature tensile strength (800 ℃ 1000 MPa and good welding performance. Compared with the pure industry titanium, the new titanium alloy mainly includes various different grades of industry pure titanium and widely used Ti5Al2.5Sn Titanium alloy, industrial pure titanium room temperature tensile strength fluctuates in the range of 350 ℃ 700MPa. Ti5Al2.5Sn alloy process plasticity is slightly lower, and the thermal strength is higher, long-term working temperature can be as high as 450 ℃.

With the rapid development of cutting-edge science and technology such as aviation, aerospace, nuclear energy, etc., the requirements for materials are becoming more and more stringent. Not only are the materials for manufacturing equipment parts in these aspects resistant to corrosion, wear, and micro-vibration, but also require high resistance. temperature. It is necessary to pay attention to long-term tests. In many places, before the chemical industry applies titanium on a large scale. Under the test conditions, cooperate to check its service life and material structure. If most of the conventional structural data shows that the lack of safety (immature) results in low economic benefits, then firstly titanium and its alloys must be gradually developed, and the high-tech technology in the field of structural data has been developed in recent decades Mature other new materials. Therefore, the military sector has developed faster than the civilian sector in the application of titanium and its alloys.

In many industrial media, the rare earth and precious metals that are mainly used are often stable, or the corrosion resistance of materials such as stainless steel can only reach a certain limit. Most applications use titanium because of its low density, corrosion resistance and strength. So far. And the cost of consumption is relatively high, so the use of titanium or titanium alloys can obtain higher corrosion resistance. The creep characteristics of hard titanium when it exceeds 150T exceed aluminum and its alloys. Considering that compared with other materials, titanium alloys have unique creep characteristics under low-density conditions, and they have found the advantages of hard titanium in aircraft manufacturing and missile manufacturing. The importance of application. The earliest application of titanium and titanium alloys was in the aerospace industry. Recently, the aerospace industry is increasingly in need of high-strength and low-density materials, which has greatly promoted the development of the titanium manufacturing industry. In the early 1950s, the United States successfully applied titanium to aircraft. At that time, although the E-machine only used 1% of the structural weight of titanium, it pioneered the pioneering way of using titanium in the aviation industry. At present, titanium alloys are widely used as structural materials in many high-speed aircrafts in the world.

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What are the precautions for alkaline cleaning of titanium alloy rods?

Alkaline washing of titanium alloy rods is easy to catch fire, especially alkali washing of titanium sheets is more likely to catch fire. The chemical activity of the titanium alloy rod in the lye, when alkaline washing in the lye containing an oxidant, the overall lye temperature is too high or the local temperature is too high are the reasons for the burning of titanium. Studies have shown that due to the potential difference between the titanium and steel tools in the lye, there is a galvanic effect. When titanium and steel are in contact, galvanic current is formed, and the smaller the contact point, the greater the current and the excessive contact. The current density causes local overheating so that the titanium alloy rod often starts to burn from the contact point of these two metals.

In order to prevent and reduce the ignition of titanium alloy rods during alkaline washing, the following measures can be taken:

1. Selection of qualified alkaline washing liquid components;

2. Strictly control the temperature of lye;

3. Insulate the alkali washing frame with high-temperature resistant coating or high temperature resistant insulating gasket. For example, if a stainless steel alkaline cleaning frame is used, ceramic strips or ceramic pieces can be placed to separate the titanium material from the steel frame, which can also avoid fire.

In the alkaline washing process of titanium alloy rods, the lye is continuously taken away or evaporated by the workpiece, so it is necessary to supplement the lye and adjust it in a timely manner to keep the composition of the lye relatively stable. During alkaline washing, insoluble oxide scale slag settles on the bottom of the tank, which affects the good thermal conductivity of the tank, and the gap caused by the precipitation makes the steel tank prone to electrochemical corrosion, which greatly shortens its service life. Therefore, the sediment should be cleaned up in time. The use of a movable tank bottom to collect slag is a common method. When it is necessary to eliminate sediments, just hang the bottom of the movable tank.

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Performance analysis and main application areas of titanium forgings and titanium castings

After forging, the metal can improve its structure and mechanical properties. After hot working deformation of the casting structure, the original coarse dendrites and columnar grains are transformed into fine-grained and uniform-sized equiaxed recrystallized structures due to the deformation and recrystallization of the metal, which causes the original segregation, The compaction and welding of loosening, porosity, slag inclusion, etc., the organization becomes tighter, improving the plasticity and mechanical properties of the metal.
Generally speaking, the mechanical properties of castings are lower than those of forgings of the same material. In addition, the forging process can ensure the continuity of the metal fibre structure, keep the fibre structure of the forging consistent with the shape of the forging, and the metal flow line is complete, which can ensure that the parts have good mechanical properties and long service life. Precision dies forging and cold extrusion, Forgings produced by warm extrusion and other processes are unmatched by castings.
1. Aircraft forgings
By weight, about 85% of the components on the plane are forgings. Aircraft engine turbine disks, rear axle journals (hollow shafts), blades, wing spars, fuselage rib plates, wheel brackets, inner and outer cylinders of landing gear, etc. are all important forgings related to aircraft safety. Aircraft forgings are mostly made of precious materials such as high-strength wear-resistant and corrosion-resistant aluminium alloys, titanium alloys, and nickel-based alloys. In order to save materials and energy, aircraft forgings are mostly produced by die forging or multi-directional die forging presses. Car forging is calculated by weight, there are 1719% of forgings on the car. The general automobile is composed of 15 parts such as body, trunk, engine, front axle, rear axle, frame, gearbox, transmission shaft, steering system, etc. The characteristics of automobile forgings are complex appearance, lightweight, poor working conditions, and safety High standard. Such as crankshafts, connecting rods, camshafts used in automobile engines, front beams required for the front axle, steering knuckles, half shafts used in the rear axle, half axle bushings, transmission gears in the axle box, etc. Key forgings for the safe operation of automobiles.
2. Diesel engine forgings
The diesel engine is a kind of power machinery, it is commonly used as an engine. Take a large diesel engine as an example, the forgings used are cylinder head, main journal, crankshaft flange output shaft, connecting rod, piston rod, piston head, crosshead pin, crankshaft transmission gear, ring gear, intermediate gear and dye pump More than ten kinds of body.
3. Marine forgings
Marine forgings are divided into three categories: mainframe forgings, shafting forgings and rudder forgings. The main engine forging is the same as the diesel engine forging. Shaft forgings include thrust shaft, intermediate shaft and stern shaft. Rudder forgings include rudder stock, rudder post, rudder pin, etc.
4. Weapon forgings
Forgings occupy an extremely important position in the weapon industry. By weight, 60% of the tanks are forgings. Barrels, muzzle brakes and breech in artillery, rifled barrels and triangular bayonets in infantry weapons, rocket and submarine deep-water bomb launchers and mounts, stainless steel valve bodies for high-pressure coolers in nuclear submarines, shells, Bullets, etc. are all forged products. In addition to steel forgings, weapons are also made of other materials.
5. Petrochemical forgings
Forgings are widely used in petrochemical equipment. Such as manholes and flanges of spherical storage tanks, various tube sheets required for heat exchangers, full-forged cylinders (pressure vessels) of butt-welded flange catalytic cracking reactors, cylinder sections used in hydrogenation reactors, and fertilizers The top cover, bottom cover, head, etc. required by the equipment are all forgings.
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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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