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In recent years, titanium steel composite panels have added new uses, namely corrosion-resistant materials suitable for steel structures in the marine civil engineering field. This is not only because of its low cost, but also because of the welding installation of the steel structure as the main body, it is also necessary to use a titanium steel composite plate.
Overview of titanium steel composite panels What is titanium steel composite panel?
On the "British and Dictionary" "CLAD" means "in particular the anti-corrosion metal coating on other metals." "Composite plate" in the "Handbook of steel" refers to "ordinary steel and other metal complexes." That is, the titanium steel composite plate means that the surface of the ordinary ordinary steel plate is coated with titanium metal having good corrosion resistance, and the corrosion resistance of the ordinary steel plate is naturally improved.
In the JIS standard, the board is mainly used for pressure vessels, boilers, nuclear reactors, reservoirs, etc., and is used for composite steel with a thickness of 8 mm or more, and its specification number is G3603.
The history of titanium steel composite panels The production of titanium titanium in Japan began in 1954, and titanium steel composite panels began in 1962. The production method at that time was called the "explosive compounding method", a method of joining by the explosive energy. In 1986, the hot rolling method and the thick plate rolling method were developed. In 1990, the production method of continuous hot-rolled coils was developed, mainly referring to the production of thin sheets.
Titanium steel composite plate application field Titanium steel composite plate manufactured by explosion method and thick plate rolling method is a thick plate, and its use is mainly used as a corrosion resistant structural material. High-purity chemical equipment such as tannic acid equipment and tube sheets for condensers are used in power generation equipment.
The titanium steel composite plate produced 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.
Method for Producing Titanium Steel Composite Sheet Generally, a method for producing a composite steel sheet includes a filled metal ingot rolling method, an explosion composite method, a rolling pressure bonding method, a build-up welding method, and the like. In the case of titanium steel composite plates, considering the characteristics of titanium, the industry often uses explosive composite method or rolling and crimping method, and the actual production method includes 1 explosion composite method, and the rolling and crimping method includes 2 thick plate rolling. Process 3 and continuous hot rolling. The explosive composite method is usually carried out at a normal temperature, and the rolling and crimping method is to assemble a plate and heat and roll it.
The main points of the explosive composite method explosion composite method: firstly, the two metal plates to be crimped are placed at a certain interval, and an appropriate amount of explosive is placed thereon. Exploded from one end of the explosive, the explosion speed is several kilometers per second, and the titanium plate can collide from the angle of the substrate steel plate by virtue of the explosion. At the collision point, the base steel plate and the titanium plate exhibit fluid behavior due to a very large deformation speed and an ultrahigh pressure, and the oxide film and the gas adsorption layer on the surfaces of the two metals are removed as a metal jet, and the clean surface is cleaned. The joint is completed in an instant, called cold joining.
The titanium steel composite plate manufactured by the method can be further hot rolled to a plate thickness of 4 mm, so it is also called an explosion composite method.
Thick plate rolling The thick plate rolling method initially assembles a titanium plate (composite) and a steel plate (substrate) as embedded slabs. At this time, a suitable intermediate insert is placed between the titanium plate and the steel, and electron beam welding is employed under high vacuum. After being heated in a heating furnace, it is strongly pressed to the required thickness on a thick plate mill, so that the titanium plate and the steel plate are actually joined. Finally, the periphery is cut and separated into 2 sheets.
The continuous hot rolling method is basically the same as the thick plate rolling method. The difference is that the steel plates are added between the two plates, arc welding is performed under the atmosphere, and finally the continuous hot rolling mill is continuously rolled to the required thickness. , take out in the form of a tape roll. Finally, the periphery is cut and separated into 2 sheets. [next]
Application areas:
The field of equipment in the field of equipment mainly refers to similar chemical equipment for tannic acid manufacturing equipment and power equipment for condenser tube sheets for power plants. In particular, shipments in the power sector have accumulated to more than 1,000. This field is the pillar industry of titanium steel composite panels. Recent topics: titanium steel composite panels are also used in bleaching tanks in paper mills and in the harsh sodium chloride treatment tanks in sewage treatment plants.
The maintenance of marine structures in the marine civil engineering area is facing the sea in Japan, and the base of economic activities is located in the offshore area. With the needs of economic development, the space of facilities such as circulation, transportation, and urban functions is utilizing the sea area, and from the past inland seas, The shallow waters of Neiwan develop into the present offshore and deep sea areas. To this end, Japan has established a super-large floating technology research group to conduct theoretical research and field tests on a large-scale floating ocean structure with a scale of several kilometers and a durability of 100 years. Titanium has excellent corrosion performance, and it has few eluting ions in seawater environment, is non-toxic, and does not have to worry about environmental pollution. It has become the material of choice for marine structures.
Development of Titanium Steel Composite Panels As described in Table 1, titanium has very good corrosion resistance in flowing seawater. There are currently two methods for making titanium materials as marine structures. One is to make a titanium composite sheet and an organic corrosion-resistant material into a composite cladding material; the second method is to use a titanium steel composite panel to be welded to a newly built building. As far as the second method is concerned, there are two problems, one of which is the problem of joining titanium as a lining. It is economically untenable that titanium alone is used as a structure. It is economical to make the main body of the structure made of steel only by giving full play to the corrosion resistance of titanium. However, brittle intermetallic compounds formed by directly bonding titanium to iron are also not practical. Only the "titanium steel composite plate" in which titanium and steel are combined by hot rolling, the steel portion of the composite plate is welded to the main body of the steel structure, and the corrosion resistance of the composite titanium is utilized. The size of the two titanium steel composite panels. In the past, it was impossible to manufacture a titanium steel composite sheet, and when the material was used as a lining material, the size and shape were limited because the sheet was too thick. Therefore, a continuous hot rolling mill is used in the production process of the thin steel sheet, and the coil-shaped titanium composite steel sheet having a thickness of only 5 mm is used. The composite steel sheet has a joint strength of about 150 to 200 MPa, which is slightly higher than the value specified by Japanese standard JIS-G3603, and is suitable as a lining material for an anticorrosive material.
The advantages of the titanium steel composite sheet are: (1) titanium does not substantially corrode in seawater, and titanium metal ions do not dissolve; (2) titanium organisms are not toxic and have no effect on the surrounding ecological environment; (3) If titanium does not corrode for an extended period of time, it will be a very friendly material for the environment.
Table 1 Corrosion rate of various metal ions in flowing seawater Carbon steel Zn Al Cu-Ni alloy Ti
150 5 50 8 20 <1
The application of marine structures is currently constructed in Yokosuka with a super-large floating ocean structure, and titanium steel composites are used in the scouring of seawater droplets. The newly developed titanium steel composite panel is basically the same as the manufacturing cost of high grade stainless steel. In the construction of the Tokyo Bay across the road, titanium was used as the splashing torso of the pier, and the amount of titanium used in each pier was 0.9t (Table 2). [next]
Table 2 Application examples of Japan titanium steel composite panel lining anti-corrosion engineering project name number of anti-corrosion height anti-corrosion area dosage 91.1~93.10 Tokyo Bay across the road pier 12 feet 5.0m 2200m 80t
94.11~953 The bottom of the ice sea outlook tower 1 base 7.0m 200m 7t
95.8~96.7 Large floating coating experiment 3 places 2.0m 30m 1t
98.11~99.2 Dream dance floating bridge pier 2 feet 2.4m 1000m 36t
02.1~02.12 Port Safety Island Chong Bridge 8 feet 4.7m 800m 30t
Total 4230m 154t
Conclusion Titanium steel composite panels have been in existence for more than 40 years since their inception, and their main application areas have used more than 1,000 condenser tube sheets. On the other hand, marine civil engineering is also beginning to be used and there will be more opportunities. Titanium-steel composite panels are effective in utilizing the excellent corrosion resistance of titanium and the strength of steel, and have achieved the best combination of cost. It is expected to further develop in this respect in the future.
Manufacturing technology of titanium steel composite board and its broad use
Introduction <br> titanium because of its excellent corrosion resistance are widely used as containers in various chemical reactions, the heat exchanger material, but the drawback is high cost. This problem is particularly acute when used as a structural component. An effective solution is to use a titanium steel composite panel. The composite material of titanium and ordinary steel is called titanium steel composite material, which has the corrosion resistance of titanium and the strength of ordinary steel plate as a structure. It is important that the cost is also greatly reduced.