Application of TC4 titanium alloy and TC11 titanium alloy in titanium materials in important fields such as chemical petroleum and electric power

Titanium and titanium alloys have low density and high tensile strength. In the range of -253-600 degrees Celsius, its specific strength is almost the highest among metal materials. In a suitable oxidizing environment, it can form a thin and hard oxide. The material film has excellent corrosion resistance. In addition, it is also non-magnetic and has a small linear expansion coefficient. This makes Gr9 Ti-3Al-2.5V Titanium Wire and alloys first known as important aerospace structural materials, and then they have also been popularized in shipbuilding, chemical industry and other fields, and they have developed rapidly. Especially in the chemical industry, more and more products are using titanium and titanium alloy products, such as petrochemical, fiber, pulp, fertilizer, electrochemical and desalination industries, as exchangers, reaction towers, synthesizers,

With the development of science and technology, the application fields of titanium are becoming more and more extensive, such as in medical, automobile, sports and other fields. Through these, titanium metric screw is also truly reflected as a light metal, and its properties are getting better and better. It has been recognized and repaired by people, and replaced other metals as soon as possible to integrate into our production and application fields, and even our body.

How magnetic is a titanium tube? what is the purpose?

Titanium rod barrel burnishing is to grind the parts and abrasives in dilute acid or dilute alkali with emulsifier (or corrosion inhibitor) and follow the rotation of the drum to obtain a bright appearance. It is suitable for the disposal of small parts and parts that are difficult to polish and polish. The correct selection of roller burnishing standards can improve productivity and quality.

(1) The shape of the roller

The shape of the roller is round, hexagonal and octagonal, among which the polygonal shape is good for practicality. This is because the radii of the barrel wall from the axis are not equal, and there is a certain point of view, so the rolling parts are easy to change the position, the chance of collision with each other increases, the grinding is uniform, and the efficiency is high, which can shorten the rolling time.

(2) The size of the drum

The direct alignment is 50mm-100mm, and the length varies with the number of grids. The length of the first pattern roller is 600-800mm; the second pattern is 800-1500mm. Usually the larger one is better. This is because the parts are subjected to high pressure and friction in the drum, so the amount of cutting is also increased. But for those parts that are afraid of being stressed and easily deformed, a small roller can be used and the length of the roller can be increased.

1) Data for roller

There is a direct relationship between the rotation speed of the drum and the scraping amount of the parts within a certain range, that is, the faster the rotation speed, the greater the scraping of the metal surface. However, when the speed exceeds a certain upper limit, it drops instead. Because when the rotating speed is too fast, the centrifugal force of the parts in the drum increases, which reduces the friction. Usually it is appropriate to control at 45r/min.

2) Abrasives and solutions for roller burnishing

Abrasives for rolling include pumice, quartz, titanium foil granite skin angles, shells, iron filings and ceramic fragments. The size of the abrasive particles should be larger or smaller than each hole of the Cen part. The amount of content in the drum is also an important factor affecting the quality of the agricultural surface of the parts. The amount of people inside the drum is usually 70% of the drum volume. Regarding heavier parts or threaded parts, the load should be controlled at 80%-90%. The solution in the drum should be added to about 95% of the drum volume (note: when adding acidic solution to the drum, you should first add enough water, and then add acid, to avoid corrosion of parts in the rolling process, because of the increase in time , The concentration of the built-in solution gradually decreases, grade 7 titanium alloy sheet or even loses its effect. Therefore, the concentration of the solution should be checked and replaced at regular intervals. The burn-in time should not be too long, otherwise the parts will be damaged. That is, use a brush to remove the surface of the parts. Burrs, terbium compounds, remaining oil and corrosion sludge, etc., and make the parts have a certain luster. Be sure to point out that elastic, rigid or thin-walled parts should be taken out in time after the finishing of rolling, otherwise it will easily cause hydrogen seepage or local over-corrosion .

What are the characteristics of seamless titanium tube?

1. As an emerging material, astm b348 titanium rod has been used in the pharmaceutical industry, surgical instruments, human implants and other fields in my country and the world for decades, and has achieved great success.

2. Bone and joint injuries caused by trauma and tumors in the human body, artificial joints, bone plates and screws can be made from Gr9 Ti-3Al-2.5V Titanium Foil and titanium alloys and are now widely used in clinical practice. It is also used in hip joints (including femoral heads), knee joints, elbow joints, metacarpophalangeal joints, interphalangeal joints, mandibles, artificial vertebral bodies (spine orthoses), pacemaker housings, artificial hearts (heart valves), Artificial dental implants, and Grade 36 Titanium Bar mesh are used in cranial plastic surgery.

3. The requirements for implant materials can be classified into three aspects: the biocompatibility of the material with the human body, the corrosion resistance of the material in the human environment, and the mechanical properties of the material.

Matters needing attention for titanium tube processing?

The workability of titanium alloy is 20-40% of that of 45# steel, and the hardness is less than HB300, which will cause a strong sticking phenomenon; HB>370 is too hard to make processing difficult, and it is best to process titanium alloy with hardness HB300-370. The main reasons that affect its machinability are briefly described as follows: 1) Gas impurities (oxygen, nitrogen, hydrogen, etc.) have a great impact on the machinability of titanium alloys because titanium has high chemical activity and is easy to combine with gas impurities. When the temperature exceeds 600 degrees, titanium is oxidized to form an embrittlement layer, the so-called "structure alpha layer"; it produces hydrogen embrittlement with hydrogen, and forms hard and brittle TiN with nitrogen at high temperatures. 2) The plasticity of titanium alloy is small, which obviously affects its plastic deformation during cutting. The deformation coefficient of titanium alloy is only 1 or even less than 1, while the deformation coefficient of ordinary carbon steel is about 3. During cutting, the chip has a very small contact surface with the rake face, which makes the contact area pressure and the local temperature high, and the tool wears quickly. 3) Severe work hardening occurs when titanium alloy is processed
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Application fields of titanium and titanium alloys such as titanium tubes and rods at home and abroad?

Titanium and titanium alloy has good welding, cold pressure processing, and machining performance, the profile is processed into a variety of titanium, titanium, and titanium rods titanium sheet supply pipes. Titanium is an ideal structural material, not the density of titanium, only 4.5g / m3, 43% lighter than steel, but the strength of titanium is higher than twice iron, almost five times higher than aluminum. Having low density and high strength properties. This high strength and density of the combination of small, titanium rods in the art occupies a very important position. At the same time the corrosion resistance of titanium alloy bars near or over stainless steel, so in terms of petroleum, chemicals, pesticides, dyes, paper, light industry, aviation, space development, marine engineering, etc. have been widely used. Titanium alloys have high specific strength (ratio of strength and density), titanium rods, titanium rod has an irreplaceable role played in aviation, military, shipbuilding, chemical, metallurgical, mechanical, medical, and other fields. For example, an alloy of titanium and aluminum, chromium, vanadium, molybdenum, manganese, and other elements, after heat treatment, the ultimate strength of up 1176.8-1471MPa, specific strength of 27-33, and which is the same strength alloy steel, its specific strength is only 15.5 -19. Titanium is not only high strength and corrosion resistance, so shipbuilding, chemical machinery, and medical devices have a wide range of applications. Wherein the reactor is mainly used for corrosion resistance alloy highly corrosive environments, towers, autoclave, heat exchangers, pumps, valves, centrifuges, pipes, fittings, electrolyzer. However, due to higher prices of titanium alloys, limiting their use.

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Titanium plate manufacturing process and characteristics?

Due to the strong liveliness of the titanium tube, the welding temperature control, the protective effect of the shielding gas, and the welding environment are more stringent in the implementation of the welding of the titanium tube. A slight carelessness will cause a greater impact on the welding quality. If the impact is serious, the product will be scrapped. The practice has proved that by analyzing the main factors affecting the welding quality, determining the key welding process, strengthening the control of the environment, personnel, welding parameters, and methods in the welding process, can effectively ensure that the welding quality of the titanium tube material is further improved Improve to prevent the emergence of welding waste.

In recent years, a new type of titanium pipe has been widely used. Because of its light specific gravity, high strength, and corrosion resistance, titanium alloys are widely used in aerospace, petrochemical, and machinery manufacturing, and are currently used for the first time in the construction of surface ships' piping systems. However, because titanium alloy is a highly active metal, it has a great affinity for oxygen, hydrogen, nitrogen, and other gases at high temperatures, that is, it has a strong ability to absorb and dissolve gases, especially in welding process. This ability is particularly strong with the increase in welding temperature. The practice has proved that if the absorption and dissolution of titanium alloy and oxygen, hydrogen, nitrogen, and other gases are not controlled during welding, the product will eventually be scrapped. Therefore, the welding of titanium pipe joints must be effectively prevented and controlled to meet the welding quality requirements.
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Why do we need to carburize the surface of titanium alloy wire?

The excellent characteristics of titanium make its use continue to expand, and the demand for high-quality titanium pipes is also increasing. In the past, the thin titanium pipe processing methods mostly used the die drawing method, and there was fierce friction between the titanium pipe and the mold. The surface of the titanium tube is ablated and bonded, and the dimensional tolerances are difficult to control. In order to prevent these ills, it is usually necessary to perform oxidation treatment on the titanium material to form an oxide film on the surface for lubrication, and the amount of processing after each oxidation treatment It should not be too large, the oxide film is very hard, it is easy to cause mold wear, and there are problems in product size and surface quality. Therefore, it is eager to develop low-cost and high-quality titanium thin titanium tube processing methods.

According to the rolling theory of titanium tubes, the Q value (the ratio of the relative wall reduction to the relative reduction in diameter) has a great influence on the inner surface quality of the tube during the rolling process. In the three-roll rolling process, for a certain pass, after flaw detection and sampling to observe the cross-section, to ensure that there are no cracks on the inner surface, different Q values ​​(0.87, 1.00, 1.26) are selected for rolling. In the middle pass, ultrasonic flaw detection is performed on the pipe, and the cross section is sampled and observed to ensure that there are no cracks on the inner surface before proceeding to the next rolling. Results When the Q value was 0.87, the inner surface micro-cracks were very shallow, with a depth of about 5 μm, and there were fewer cracks; when the Q value increased to 1.26, the inner surface micro-cracks depth reached 50 μm. The micro-cracks appearing on the inner surface of the pipe are mainly due to the three-roll rolling that reduces the diameter first and then reduces the wall. The reduction is large and the reduction is too small, which causes the accumulation of materials during the reduction process and the formation of longitudinal micro-cracks on the inner surface. Therefore, when rolling titanium alloy pipes with a three-high rolling mill, the Q value should not exceed 0.87, otherwise cracks are prone to appear on the inner surface of the pipe.

During the cold-rolling process of small-size thick-walled titanium alloy pipes, micro-cracks are prone to occur on the inner and outer surfaces. The microcracks on the outer surface are usually removed by grinding and scraping, and the effect is very good; for the microcracks on the inner surface, in the industrial production process, the main method of boring is used to remove the inner hole larger than 13mm, and the inner hole smaller than 13mm Generally, no treatment is required, so the internal surface quality control is difficult.

(1) When rolling small-size thick-walled titanium alloy pipes, the deformation of the two-roll billet rolling is selected at 39%, and the inner and outer surfaces of the pipe are of better quality.

(2) When three-roll cold-rolling small-size thick-walled titanium alloy pipes, the Q value should not exceed 0.87, which can ensure that the inner surface of the pipe has a good quality and no cracks. Considering the good match of strength and plasticity, the deformation of three-roll rolling is selected at 30%, which can obtain better mechanical properties and microstructure.

(3) In the rolling process of titanium alloy pipes, for every 1 to 2 passes of rolling, degreasing, pickling, annealing, and straightening are performed, and then sandblasting + pickling is used to remove internal surface cracks. . Taking this measure can increase the flaw detection qualification rate of finished pipes to 35%-40%.

The microstructure of the finished pipe after being vacuum annealed at 750℃ under the conditions of 25%, 30%, 36% rolling deformation. It can be seen that the microstructure of the annealed titanium alloy tube is an equiaxed structure. As the amount of deformation increases, the degree of recrystallization becomes more complete and the crystal grains become finer. The room temperature mechanical properties of the finished pipe after vacuum annealing at 750℃ under the conditions of rolling deformation of 25%, 30%, and 36%. It can be seen that when the deformation is 25%, the yield strength of the finished pipe is 550MPa, the tensile strength is 675MPa, the elongation is 15.5%, and the elongation is slightly higher than the standard required value of 15%; when the deformation is 30%, the resistance The tensile strength is 670MPa, the yield strength is 535MPa, and the elongation is 17%; when the deformation is 36%, the tensile strength is 640MPa, and the yield strength is 517MPa, which is slightly higher than the standard required value of 515MPa, and the elongation reaches 19%. Considering the good match of strength and plasticity, comparing the mechanical properties and microstructure under different deformation conditions, it is reasonable to select 30% for the rolling deformation of the finished pipe.
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