ASTM B265 GR2 Titanium Clad Plate

As an important performance index of ASTM B265 GR2 Titanium Clad Plate, the interface bonding quality has always been the focus of attention. The factors affecting the interface bonding quality such as surface treatment method, hot rolling temperature, transition layer metal and heat treatment process have also been the research focus in this field Because brittle phases such as TiC, FeTi or Fe2Ti generated at the titanium/steel interface will damage the interface bonding quality of titanium/steel composite plates, and adding transition layer metal can effectively avoid the formation of brittle phases to a certain extent, people have conducted a lot of research on the selection of transition layer metal at the titanium/steel interface and the impact of transition layer on the interface bonding quality, but the addition of transition layer metal will increase the cost of raw materials and preparation, Limited the industrial promotion and application.

 

The raw material condition determines the preparation method and application field of titanium/steel composite plate, while the size, interface characteristics and mechanical properties of the composite plate are the main indicators and key factors affecting the practical application of titanium/steel composite plate Therefore, the situation of raw materials and the size, interface characteristics and mechanical properties of the composite plates have always been the focus of research and development of titanium/steel composite plates

1.1 Raw materials

Titanium has an atomic number of 22 and atomic mass of 47.87. It is a close-packed hexagonal structure at below 882 ℃ α- Ti, when the temperature exceeds 882 ℃, titanium will change into body-centered cubic structure β- Ti. Titanium metal has silver-gray luster and higher yield strength than steel, but its weight is almost half of that of steel of the same volume. In the environment with oxygen, moisture, oxidant, copper, iron, gold, platinum and other metal ions or OH −, the surface will be passivated to form a solid, dense oxide film that can heal automatically when damaged. Especially in natural environment such as seawater, titanium has better corrosion resistance than stainless steel, So titanium is also known as marine metal. China has rich titanium ore resources, accounting for about 20% of the world's total reserves. Only the proven vanadium-ilmenite in Panxi, Sichuan Province

Up to 9.6 × 109t. However, titanium has a strong affinity with oxygen, nitrogen, carbon, hydrogen and other elements, and reacts with most refractory materials at high temperatures, resulting in a very complex and difficult extraction process of titanium. The market price of Shanghai sponge titanium is as high as 80000 yuan per ton The high preparation cost has seriously restricted the promotion and application of titanium. In contrast, the price of steel on the market is very low (for example, the price of carbon steel is only 4000 yuan per ton). The composite of titanium and steel into titanium/steel composite plate not only has the excellent corrosion resistance of titanium and the high strength of steel, but also can greatly reduce the cost.

1.2 Composite plate size

The size of titanium/steel composite plates prepared by explosive bonding method and diffusion bonding method has limitations. It is difficult to prepare titanium/steel composite plates with a thickness of less than 2 mm by explosive bonding method ; The size of titanium/steel composite plate prepared by diffusion composite method is small, which is generally used for laboratory research In order to expand the size of titanium/steel composite plate, explosion - rolling composite method and hot rolling composite method are generally used In recent years, with the development of rolling composite technology in China, good results have been achieved in the preparation technology of large-area and thin-clad titanium/steel composite plates, such as the adoption of explosion -

The titanium/steel composite plate with titanium coating thickness of 1.2~1.6 mm, steel base thickness of 12~18 mm and single sheet area of 35 m2 was prepared by rolling composite; The width of titanium/steel composite plate prepared by vacuum billet hot-rolling composite method in cooperation with domestic steel mills has reached 3.5 m. With the continuous expansion of the application field of titanium/steel composite plates, the market demand for ultra-thin or ultra-thick titanium/steel laminated composite plate with wide width will be increasingly strong in the future.