Characteristics and application fields of titanium steel composite board
The metal layered composite board can achieve perfect metallurgical combination of different metals with extremely different strength, melting point and thermal expansion coefficient, and combine the advantages of different materials to fully utilize the use characteristics of different materials, greatly save precious metal materials and reduce equipment. Manufacturing costs make it possible to use rare metals in many fields. Composite materials produced by explosive composite technology can achieve the perfect combination of different metals without changing the composition and physical properties of the original materials. Metal composite panels can be individually designed and designed to be optimally used as needed. The metal composite board material not only has good weldability, formability, thermal conductivity and good mechanical properties of carbon steel, but also has excellent corrosion resistance of various layers. Therefore, it is widely used in petroleum, chemical, metallurgy, light industry, salt chemical industry, auxiliary power station, seawater desalination shipbuilding, power and marine engineering.
A notable feature of titanium is its high corrosion resistance due to its high affinity for oxygen, which produces a dense oxide film on its surface that protects the titanium from dielectric corrosion. Metal titanium can form a passivation oxide film on the surface in most aqueous solutions. Therefore, titanium has good stability in acidic, alkaline, neutral saline solution and oxidizing medium, and has better corrosion resistance than existing stainless steel and other commonly used non-ferrous metals, and even comparable to platinum. Therefore, titanium is widely used in various chemical reaction vessels, heat exchanger materials and anti-corrosion fields, but the disadvantage is that the cost is high, especially when used as a structural component, and the titanium steel composite panel produced by the explosive composite method is particularly prominent. There is both the corrosion resistance of titanium and the strength and plasticity of ordinary steel plates as structural members. It is particularly important that the cost is greatly reduced. With the continuous advancement of equipment manufacturing technology in China, the application fields of titanium steel composite board materials will continue to expand.
1 Petrochemical and chemical container equipment manufacturing
The manufacture of petrochemical equipment containers is a traditional application field of titanium steel composite board materials, and its application quantity has always occupied the first place. In the chemical industry, titanium has good stability in various acid, alkali and salt media except for four inorganic acids and highly corrosive aluminum chloride. Therefore, titanium is an excellent anti-corrosion material in the chemical industry and has been widely used. For example, a vacuum tower, a distillation column, a heat exchanger of a petroleum refinery, various reaction towers, a precipitation tank, a stirrer, and the like of a chemical plant. Urea is an important fertilizer. In the production process, urea, ammonia, ammonium carbamate and their mixture are highly corrosive under high temperature and high pressure conditions. After replacing the stainless steel with titanium steel composite board, the life of the equipment is greatly extended and the maintenance time is greatly increased. Reduced, so the main equipment in the current urea production uses titanium steel composite sheet titanium to have special corrosion resistance to chlorine dioxide, chlorous acid, chlorite and other bleaching agents. Therefore, titanium steel composite board is in the textile printing and dyeing industry. There are also important applications in the bleaching equipment of the paper industry.
2 vacuum salt equipment manufacturing
Titanium and its alloys have excellent resistance to seawater and chloride solution corrosion and fluid washout. Since the 1980s, titanium steel composite plate salt production equipment has been put into use in vacuum salt production plants in Sichuan and Inner Mongolia. Because of its smooth surface and corrosion resistance, it has a good effect on preventing salt scale on the evaporation tank wall and prolonging the tank washing cycle. The evaporation chamber made of titanium steel composite board has good effects on slowing down corrosion and salt scaling, prolonging production cycle and improving salt uniformity. In 1987, Sichuan Daan Salt Factory and Wutongqiao Salt Plant used two sets of 300,000 tons of vacuum salt production main equipment evaporating tanks using titanium materials, which promoted the application of titanium, only two sets of salt making equipment and evaporation tanks. The use of titanium and titanium steel composite panels reached 360 tons, making the vacuum salt industry one of the largest users of titanium and titanium steel composite panels.
The application of titanium steel composite board reduces the use cost of salt plant equipment, and the corrosion resistance is better than that of duplex stainless steel, and the service life is long, but the price is lower than the market cost of using duplex stainless steel. In 2007, Baoti Group Composite Board Company supplied more than 600 tons of TA2/TA10 titanium steel composite board to Sichuan Jiuda Salt Factory for the equipment manufacturing of the 600,000-ton vacuum salt production project, becoming a single-application titanium steel composite. The project with the largest amount of plates has been operating well for more than four years.
3 seawater desalination field
There are not enough fresh water resources in the world. China is also one of the 13 poor countries in the world. The per capita fresh water resources are only 1/4 of the world's per capita, and the water resources are unevenly distributed. A large amount of fresh water is concentrated in the south, and the northern freshwater resources are only 1/4 of the South. It can be said that the overall situation of freshwater resources is not optimistic.
Titanium and its alloys have excellent resistance to seawater and chloride solution corrosion and fluid washout. Moreover, titanium is non-toxic, making it an ideal material for desalination equipment. In the next 20 years, the international desalination market will have nearly 70 billion US dollars of business opportunities. China will have a market of billions of dollars in the future. Now desalination companies from the UK, France, Singapore, Denmark, Japan and other countries have come to China to engage in technology, investment and construction activities. At present, the Chinese market has become an important strategic market for foreign desalination equipment and equipment manufacturing groups, which will definitely set off. The application of titanium steel composite sheet climax.
4. Localization of PTA equipment
The purified terephthalic acid (PTA) oxidation reactor is difficult to manufacture.
The technical requirements are high, the working environment of the equipment is harsh, and the manufacturing requirements for materials are high. Its equipment manufacturing and materials have always been monopolized by foreign countries. In October 2010, the nationalization demonstration project approved by the National Development and Reform Commission and the flagship project of the petrochemical industry--million-ton large-scale purified terephthalic acid (PTA) oxidation reactor Nanjing Baose Co., Ltd. was off the assembly line. The successful development of this equipment has broken the technical barriers for foreign key equipment of large-scale PTA plants in China, and its equipment materials are mainly titanium steel composite plates. The 1.2 million tons/year PTA oxidation reactor manufactured by Nanjing Baose Co., Ltd. is the PTA oxidation reactor with the largest specification and the highest single capacity of titanium steel composite board independently manufactured by domestic technology package. It has a diameter of 7,800 mm, a length of 40 meters, a total weight of 420 tons, and a volume of 1,200 cubic meters. It is the world's largest titanium steel composite pressure-bearing equipment, and it is also the most difficult equipment for manufacturing and welding technology. It is understood that as the core equipment of the PTA device, Baostei's domestically produced million-ton PTA oxidation reactor is only half the price of imported equipment, which not only reduces the construction cost of the PTA plant, but also reduces the production cost of the polyester product. Since 2009, Baoti Titanium Composite Sheet Co., Ltd. has provided more than 3,000 tons of titanium steel composite panels to Nanjing Baose Co., Ltd. for PTA equipment manufacturing.
5 nuclear power equipment manufacturing
Thick multi-layer large-slab titanium steel composite board is the main material for condenser tube sheets in nuclear power equipment. According to estimates, in the next ten years, China's annual average installed nuclear power capacity will be 7.7 million kilowatts, corresponding to the demand for titanium steel composite plates for nuclear power. The volume is about 924 tons / year, the market space is very large, the future million kilowatts of nuclear power titanium steel composite panels will show explosive growth, and the application prospects are more optimistic.
6. Ocean Engineering
In recent years, titanium steel composite panels have added new uses, namely the use of corrosion inhibitors for steel structures in the marine civil engineering sector. This is not only because of its low cost, but also from the welding installation of the steel structure as the main body, it is also necessary to use a titanium steel composite plate. The advantages of the titanium steel composite sheet are as follows: (1) titanium does not substantially corrode in seawater, and titanium metal ions do not dissolve; (2) titanium organism has no toxicity and has no influence on the surrounding ecological environment, and is a kind Environmentally friendly materials. The titanium steel composite plate manufactured by continuous hot rolling is a thin plate, which is mainly used for the lining of marine steel structures, and the application field is marine civil engineering.
The newly developed titanium steel composite board is basically the same as the manufacturing cost of high-grade stainless steel. At present, Japan has built a super-large floating ocean structure in Yokosuka, using titanium steel composite material in the seawater droplet scouring area, spanning in Tokyo Bay. In the construction of the road, titanium is used as the splashing torso of the pier, and the amount of titanium in each pier is 0.9t or more.
In summary, the titanium steel composite board not only has excellent corrosion resistance of titanium composite layer, but also has the strength and plasticity of the base carbon steel, and is an ideal material for the manufacture of corrosion-resistant environmental equipment. The titanium steel composite board follows the equipment manufacturing technology. Gradually improve and continuously improve the production process of titanium steel composite plates, the types and specifications of titanium steel composite plates will continue to increase, and its application fields will be more extensive and widespread.