Structural changes of titanium rods and titanium alloy rods during hot extrusion

Titanium plates made of titanium and titanium alloys. Titanium processed products such as titanium rods, titanium tubes, and titanium wires have excellent performance, high specific strength, and corrosion resistance. They are important metals in aerospace, offshore oil industry, medical equipment and other fields. However, due to the high cost of titanium alloy manufacturing, In order to reduce its cost, the competitiveness of titanium alloys in the entire metal material market is increased at a lower price. It is generally believed that titanium has superior properties that other materials cannot match, but the price of titanium often discourages consumers (especially car manufacturers). The emergence of high-quality and low-cost titanium alloys will certainly help expand the 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) Multifunctionalization, that is, 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, and low modulus biology Titanium alloys such as medical use to further expand the application of titanium and titanium alloys.

(3) Deepen the research of traditional alloys, improve the practical performance of existing alloys through equipment and process improvements, and expand the scope of use of traditional alloys.

(4) Adopt advanced processing technology, large-scale and continuous processing equipment, and 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) Low cost, develop alloys that do not contain or contain precious metal elements, and add cheap elements such as iron, oxygen, and nitrogen, and develop titanium alloys that are easy to process, easy to cut, alloy elements, and master alloys. Develop titanium alloys that maximize the use of waste materials and increase the recycling rate of waste titanium. This is particularly important for reducing the cost of civilian titanium alloys.

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titanium seamless pipes rolling method and precautions

With the continuous expansion of the application field of titanium pipes, the dosage is also rising. Our titanium pipes have been applied in construction, in order to make the construction more scientific to provide users with high-performance titanium pipes.

The hard work always pays off. After customers use the titanium tubes we produce and process, they have a very high evaluation, established a long-term cooperative relationship, and continue to introduce customers to our company.

The research on refractory materials for casting molds has always been linked to the crucible materials for smelting titanium tubes and titanium alloy tubes. Based on dynamics, the crucible material has to be in contact with the titanium liquid for a long time during smelting, and the titanium liquid and The contact time of the holding material is much shorter, so the usable crucible material can be used as the casting material of the titanium alloy tube.

The materials that have been studied include carbides, nitrides, borides, sulfides, oxides, rare earth oxides, fluorides, oxyfluorides, sulfur oxides, and refractory metals such as W and Mo. Only a few materials have high chemical stability to titanium liquid, including ThO2, some rare earth oxides, TaB2, Npc, some rare earth sulfides and some rare earth oxyfluorides.

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Smelting and casting process of titanium and 6al 4v titanium plates

Titanium is stable in the air at room temperature; because titanium has a low density and high strength, the density is only half that of steel, but the strength is similar to steel, high-temperature resistance, low-temperature resistance, and corrosion resistance. The strength of titanium alloy is higher than steel. Titanium is known as "space metal" and can maintain high strength and mechanical properties in a wide temperature range of -253°C to 500°C. Since the 1950s, its proportion in aerospace has become larger and larger, and titanium alloys have become necessary materials for rocket engine shells, artificial satellites, and spacecraft.

Titanium maintains its own color tone for life at room temperature, and its unique silver-grey tone is highly polished and mercerized. Matte has a very good performance. It is the most suitable jewelry metal except platinum and gold. It is often used in modern foreign jewelry designs. However, due to the high processing technology requirements of titanium, it is difficult to cast it with ordinary equipment, and it is difficult to weld it with ordinary tools, so it is difficult to form a production scale. Titanium is light but extremely strong. It is an internationally popular jewelry material. In terms of design, its minimalist and clean-cut, high design and low-key avant-garde style are highly respected by young white-collar workers.

A titanium rod is a special metal. It has a small density and lightweight but has high specific strength and strong corrosion resistance. It will not turn black like silver and will maintain its silvery-white tone for life at room temperature. Titanium has a high melting point and is often used in aerospace. Military precision parts. In terms of chemical reaction, the strong corrosive "Aqua regia" can swallow silver and gold, and even erode the so-called "stainless" stainless steel. However, "Aqua regia" has no alternative to titanium. It has been immersed in "Aqua regia" for several years. Titanium is still shining! Titanium is also added to stainless steel to resist acid and alkali.

Titanium plate has a unique purpose in medical doctors. When titanium metal comes in contact with substances, there will be no chemical reaction. In other words, because of the high corrosion resistance and stability of titanium, it will not affect its essence after long-term contact with people, so it will not cause human allergies. It is the only one that has no effect on human autonomic nerves and taste. metal. Titanium is also called "biophilic metal". In the bone damage, fix it with a titanium splint and a titanium bone nail. After a few months, the bone will grow on the titanium splint and the thread of the titanium bone nail, and the new muscle will be wrapped in the titanium splint. "Titanium bone" is just like real bone, and even titanium artificial bone can be used instead of bone to treat fractures.

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How does the titanium plate modify the surface of the titanium plate and improve the toughness?

Titanium is an ideal structural material. The density of titanium is only 4.5g/m3, which is 43% lighter than steel, but its strength is twice as high as iron and almost 5 times higher than pure aluminum. It has low density and high strength performance. The combination of this high strength and low density makes titanium occupy an extremely important position in technology. At the same time, the corrosion resistance of titanium is close to or higher than that of stainless steel, so it has been widely used in petroleum, chemical industry, pesticides, dyes, papermaking, light industry, aviation, space development, ocean engineering, etc.

1. Before heat treatment, oil stains, paints, fingerprints and other foreign objects (rag wire, fine iron filings, etc.) on the surface of titanium parts should be cleaned, otherwise, it will easily cause pollution during heating and affect the performance of the parts. In particular, the hazards of fingerprints should be pointed out. The high-temperature test shows that when the sample is stressed and is in contact with pure NaCl, the sample will crack, which is the result of hot salt stress corrosion. In 1955, it was discovered abroad that there were surface cracks in Ti-6Al-4V alloy samples after creep test at 371℃. Research and analysis have determined that the appearance of these cracks is usually related to fingerprints. Since fingerprints are harmful to the workpiece, you should avoid direct contact between your fingers and the workpiece during operation, and you must wear clean white gloves when taking parts at room temperature. In addition, titanium alloys must not be processed in the same furnace as aluminum, copper, etc., let alone processed in the same tray.

2. During heat treatment, the titanium parts are heated to a higher temperature and kept at the high temperature for a certain period of time. As the heated material is soft and easily deformed, the position of the parts on the tray or bracket is very important. If the tray itself is not flat, the parts will deform. If heat treatment fixtures are used to improve the deformation of parts, the expansion of parts and fixtures after heating should be taken into account at this time.

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Thin titanium sheet and titanium alloy are widely used in various types of ships.

Studies have found that due to the high grinding temperature, the grinding debris easily reacts with elements such as oxygen and nitrogen in the air to form a hard layer and a brittle layer, thereby accelerating the wear of the grinding wheel.

Because titanium alloy has the characteristics of high chemical activity, high viscosity and good toughness, coupled with high temperature and high pressure in the grinding zone, adhesion between abrasive particles and metal surface due to affinity occurs, which makes the grinding wheel wear faster and affects the surface quality and dimensional accuracy are difficult to guarantee.

Generally, the grinding force per unit width is about 2-3 times that of ordinary carbon steel, and the radial force is greater than the tangential force.

Due to the high grinding temperature, greater thermal stress is generated on the ground surface, which not only causes grinding burns but also causes grinding micro-cracks. These micro-cracks are hairline-like, and their direction is generally perpendicular to the grinding direction, and the grinding surface is yellow-brown spots. Due to the influence of grinding heat, residual tensile stress is generated on the surface of the workpiece, which reduces the fatigue strength of the parts and affects the service life of the parts.

Because the grinding wheel is easy to passivate and jam, the grinding ratio is very low. On the premise of ensuring the quality of the workpiece, the productivity can only be reduced.

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Popularize the heat treatment process of titanium tube

There are two implementation standards for titanium plates, the national standard is GB/T3621-2007, GB/T13810-2007, and the American standard is ASTM B265, ASTM F136, ASTM F67, AMS4928.

1. The oxide film on the surface of the titanium seed plate is equivalent to a good durable wear-resistant hair separating agent. The use of titanium seed plate saves the separating agent, makes the electrode plate easy to peel off, and eliminates the pre-treatment process of the seed plate. The board is half lighter than the copper seed board.

2. The service life of the titanium seed plate is more than 3 times that of the copper seed plate, and it can reach 10 to 20 years depending on the operating conditions

3. The electrolytic copper produced from the titanium seed plate has a dense crystal structure, a smooth surface and high quality.

4. Since the titanium seed plate does not need to be coated with a separating agent, it can avoid the pollution of the copper electrolyte.

5. Increase the production capacity and reduce the production cost of electrolytic copper, thereby having better economic benefits.

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Welding process of titanium tube heat exchanger tube sheet

TC6 titanium alloy plate is a martensitic ti-al-mo-cr-fe-si alloy with good comprehensive properties. Its nominal composition is ti-6al-2.5mo-1.5cr-0.5fe-0.3si, and the α/β transition temperature is 960～1000℃. The alloy not only has the advantages of high specific strength and good corrosion resistance of ordinary titanium alloys but also has good comprehensive mechanical properties at room temperature and high temperature. The use temperature can be as high as 450°C. It is often used to manufacture important parts such as aero-engine blades and turbine discs, and can also be used to manufacture aircraft partitions, joints and other parts. my country has done a lot of work on the processing technology and performance optimization of TC6 titanium alloy forgings, castings, pipes and bars, but there are few studies on TC6 alloy plates. Through the control of TC6 plate cold rolling process, the basic process parameters of TC6 plate cold rolling are determined, and the cold rolling process performance of TC6 plate is studied.

The test TC6 titanium alloy ingot was smelted three times in a vacuum consumable electric arc furnace. The β-transition temperature is 975～985℃, the specific chemical composition is (wt%): al6.2, mo2.5, cr1.4, fe0.41, si0.29, o0.10, Zr<0.01, C<0.01 , N<0.01, titanium slag. The TC6 ingot is billeted in the β phase zone and forged in the α+β phase zone. After intermediate annealing and pickling, a cold rolling hardening test is carried out. When the processing speed is increased by 5%, a 200mm long test material is cut from the head of the plate, and then the remaining plate is rolled. Repeated rolling and sampling until edge cracks or surface cracks appear. The thickness, width, edge cracks, microstructure and mechanical properties of the test board were tested.

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