The main factors affecting the quality of titanium alloy seamless pipes

There are many types of titanium alloys, and pipe processing techniques and methods are different, and there are many factors that affect the quality of pipes. Starting from the smelting and preparation of titanium alloys, the content of impurity elements (such as O, C, N) has a certain impact on the structure and performance of the finished titanium alloy pipe. Generally, a high interstitial element content will increase the strength of the pipe and reduce the plasticity. The choice of preparation method also greatly affects the performance of the titanium tube. For example, the extruded tube billet has fine grains and good comprehensive properties, and the cross-rolled perforated tube billet has coarse grains, unevenness and often high-temperature deformation structures. The former is easier for subsequent tube processing. The preparation method can also affect the residual stress state of the pipe and can improve the fatigue limit and stress corrosion resistance when the pipe has residual compressive stress.

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Application and characteristics of titanium alloy in automobiles

Titanium alloy is a new type of structural and functional material. It has excellent comprehensive properties, low density and high specific strength. The density of titanium is 4.51g/cm3, which is between aluminum (2.7g/cm3) and iron (7.6g/cm3). The specific strength of titanium alloy is higher than that of aluminum alloy and steel, and the toughness is equivalent to that of steel. Titanium and titanium alloys have good corrosion resistance, better than stainless steel, especially in the marine atmosphere, they resist the corrosion of chloride ions and have good corrosion resistance in a micro-oxidizing atmosphere. The working temperature of titanium alloys is wide, and low-temperature titanium alloys are at -253℃ It can also maintain good plasticity, and the working temperature of heat-resistant titanium alloy can reach about 550℃, and its heat resistance is significantly higher than that of aluminum alloy and magnesium alloy. At the same time, it has good processability and welding performance.

The excellent properties of titanium and titanium alloys have attracted the attention of various cutting-edge industries since the industrial production of titanium. With the start of the titanium industry, in the mid-1950s, titanium entered the automobile industry. Entering the 1990s, with the global energy shortage and the strengthening of people’s environmental awareness, especially in the automotive industry, the United States, Japan, and Europe have successively promulgated a series of ecological regulations to regulate fuel efficiency, CO2 emissions, vehicle weight reduction, The safety and reliability of automobiles put forward higher requirements. Many developed countries and well-known automobile manufacturers are actively developing and increasing their research investment in titanium for automobiles. Provides powerful power for automotive titanium. In the new century, my country's titanium industry has gradually entered the automotive field.

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Application and advantages of medical titanium alloys in cardiovascular and cerebrovascular repair materials

Examples of the application of titanium and titanium alloys in the human cardiovascular system include artificial heart valves, blood filters, pacemakers and artificial heart pumps.

The main advantages are:

 ① High strength, good chemical stability, and excellent biocompatibility;

 ② Titanium is non-magnetic, and seldom produces false images in the magnetic resonance spectrum MRI;

 ③ The elasticity and shape recovery function of NiTi memory alloy is very suitable for medical applications. NiTi alloy is martensitic at low temperature (near zero) and can easily become a shape that is easy to be introduced into the human body. When the temperature rises to body temperature Reverse phase transition will occur at the time, so as to return to the original set shape and produce a larger restoring force for orthopedic and support. In recent years, the application of NiTi shape memory alloy in vascular stents has attracted much attention. However, NiTi alloys may dissolve Ni ions under physiological conditions, thereby inducing toxicity and inflammatory reactions. To this end, researchers have conducted a large number of surface modification studies on the alloy. The main methods include surface inert coating, surface oxidation, surface activation and surface grafting of macromolecules. Although the footholds are different, they can effectively inhibit the dissolution of Ni ions and improve the corrosion resistance and biocompatibility of NiTi alloys.

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The superiority of TC4 titanium tube and TC11 titanium tube has become the first choice in the petroleum equipment industry

1), lower density

Can significantly reduce the string load, especially ultra-deep oil well pipe.

2), higher strength

Including tensile strength, creep strength, fatigue strength, etc. 　　 the specific strength of different materials at different temperatures.

3), excellent corrosion resistance

Excellent seawater corrosion resistance

4) Wide operating temperature range

The operating temperature of conventional titanium alloy ranges from minus 269 ℃ to minus 600 ℃.

5), large elastic deformation capacity

Titanium alloy has high yield strength and low elastic modulus (E), so it is very suitable for springs and other parts, and more importantly, it is suitable for large-reach horizontal wells.

6), lower expansion coefficient

This feature makes petroleum equipment more adaptable to temperature changes and reduces the internal stress of structural parts.

7), non-magnetic

Meet the requirements of normal use of some detection, communication and control methods in various equipment.

8), better processing performance

Titanium gold usually has good process properties such as casting, forging, welding, 3D printing, etc., which is often an important factor in the selection process of various engineering materials.

In the 1980s, the research and application of titanium alloy pipes in the petroleum industry began in foreign countries. Chinese companies have also made certain progress in the development of titanium alloy tubing and casing pipes, and the current products have been initially tested. I believe that in the near future, titanium alloys will have more applications in the petroleum equipment industry, and new breakthroughs will be made in the world industry as soon as possible.

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Classification of titanium alloys by use in shipbuilding, metallurgy and civil applications

Titanium alloys can be divided into structural titanium alloys, heat-resistant titanium alloys, corrosion-resistant alloys, low-temperature alloys, and special functional alloys (memory alloys, superconducting alloys, hydrogen storage alloys), etc. according to their uses.

1. Structural titanium alloy

Low-strength titanium alloys are mainly used for corrosion-resistant titanium alloys. Other titanium alloys are used for structural parts called structural alloys. In practical applications, structural titanium alloys are divided into normal-strength titanium alloys, medium-strength titanium alloys, and high-strength titanium alloys alloy. Ordinary-strength titanium alloy: Because of its good processing and formability and weldability, it is mostly used to manufacture various aviation sheet parts, hydraulic pipes, bicycles and other civilian products. Medium-strength titanium alloy: The typical alloy is TC4, which is mostly used in high-tech industries such as aerospace and rocket launches. High-strength titanium alloy: generally used to replace the high-degree structural steel commonly used in aircraft structures.

2. Heat-resistant titanium alloy

Refers to a titanium alloy suitable for long-term work at higher temperatures. It has a high instantaneous enduring strength in the entire working temperature range, good plasticity at room temperature, good creep resistance and good thermal stability, and fatigue resistance at room temperature and high temperature. It is mostly used to manufacture the disks, blades, air intake receivers and structural parts of aircraft parts.

3. Corrosion-resistant titanium alloy

Refers to suitable for the application of titanium alloys in strongly corrosive media. Corrosion-resistant titanium alloys are mainly low-strength alloys, such as titanium-molybdenum, titanium targets, titanium-molybdenum targets, titanium-nickel, titanium-tantalum and other alloys.

4. Low-temperature titanium alloy

It refers to α and α-β titanium alloys suitable for low-temperature use. The strength of this type of titanium alloy increases with the decrease of temperature, and the toughness rarely decreases with the decrease of temperature. It can be used as low-temperature structural parts. It has been widely used in shipbuilding, chemical industry, metallurgy, medical treatment, etc.

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Market application prospects of titanium materials such as titanium forgings, titanium tubes, etc.

Titanium alloy materials such as titanium forgings and titanium tubes have high specific strength, good corrosion resistance, and satisfactory overall performance and processing performance, making them very dynamic structural materials in the military and civilian fields after the 1950s. In the field of aerospace, titanium alloy materials are mainly used as structural parts of aircraft engines: compressor discs, blades, drums, wind deflectors, compressor casings, high-pressure compressor rotors, shafts, aircraft landing gear, bulkheads, Shell, skin, etc. In civilian use, golf heads, artificial joints, civilian bicycles, various titanium containers (pressure vessels, chemical, electroplating baths), etc. have also entered people's lives. The market application prospects of titanium alloy materials such as titanium forgings and titanium tubes can be subdivided into:

1. Technology:

Forming and powder metallurgy technology, corrosion-resistant titanium alloy, high-temperature titanium alloy, high-strength and high-toughness titanium alloy, new processing technology, new technology, coating technology, sponge titanium preparation technology, functional and medical titanium alloy, titanium-based composite material, titanium welding Technology etc.;

2. Equipment category:

Mineral processing equipment, metallurgical equipment, smelting equipment, casting equipment, welding equipment, processing equipment, heat treatment equipment, special processing and forming equipment, instrumentation, etc.;

3. Basic category:

Titanium ore, titanium sponge, titanium powder, plates, bars, wires, cakes, rings, pipes, strips, foils, capillaries, various alloys, etc.;

4. Application category:

①Reactors, autoclaves, heat exchangers, evaporators, filters, condensers, radiators, reaction towers, fractionation towers, regeneration towers, rectification towers, washing towers, pipe pump valves, standards used in the petrochemical industry Pieces and other titanium products;

② Titanium products such as compressor plates, high-pressure vessels, blades, casings, brackets, landing gears, ducts, doors, and tie rods used in the aerospace industry;

③Sports and leisure products and crafts: golf heads, bicycles, model airplanes, rackets, climbing equipment, glasses, watches, jewelry, tableware, etc.;

④Various titanium alloy pipe pump valves, evaporation tanks, heat exchangers, circulation tanks, etc. used in the salt industry;

⑤Titanium products such as condensers, condensers, tube sheets, cold oil pipes, turbine blades in the power industry;

⑥ Titanium materials used in the shipbuilding industry to manufacture pressure hulls, structural parts, buoyancy spheres, propellers, propulsion shafts, pipe pump valves, etc.;

⑦Titanium teeth, heart valves, diaphragms, stents, bone joints and fixation screws, titanium bones, titanium surgical instruments and other medical titanium products used in the medical industry;

⑧ Various titanium alloy decorative materials used for high-level decoration in the construction industry;

⑨ Titanium products used in metallurgy, electromechanics, weapons, automobiles, and textile industries.

5. Scientific publications, titanium technology reference books, etc.

With the continuous expansion of the scope of application of titanium alloy materials and the increasing usage, it will surely promote the new progress of the titanium industry and bring about the era of titanium alloys in the development of new materials and industrial production applications.

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Introduction of titanium and titanium alloy powder

At present, my country's economy maintains rapid and healthy development, which provides a good market environment for the development of the domestic titanium industry. The rapid development of domestic titanium for the chemical industry, titanium for electric power, titanium for marine development, titanium for the automobile industry, titanium for biological engineering, etc., especially China’s newly launched large aircraft plan has greatly stimulated the demand for titanium in the domestic market. Both have become the main driving force for the development of the domestic titanium industry. This is not only a huge development opportunity for domestic titanium alloy manufacturers but also a severe challenge to the domestic titanium alloy industry. This requires titanium alloy companies to improve the technical content of their products, optimize the industrial structure, and improve their management level. It is believed that after several years of catching up, China's titanium industry can play an increasingly important role in the global titanium industry.

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