Large Diameter Double Metal Composite Seamless Steel Tube

Large diameter seamless steel pipe bimetal composite materials composed of two different metals, close integration between the pipe layers and connections through a variety of techniques to form the deformation, so that the two materials are combined into one made of a new type of metal composite pipes. The general design principle is the base to meet pipeline design allowable stress, multi-layer resist corrosion or wear. Bimetal composite pipe combines all the advantages of multiple layers of grass and, relative to the overall alloy tube can effectively reduce costs, but also in the overall alloy tube with chloride stress corrosion cracking susceptibility and (or) the acidic environment of the composite tube can improve safety and reliability. With the development of industrial technology, the complexity of the environmental media, as well as international competition intensifies, many sectors of the metal pipe increasingly demanding comprehensive performance, and therefore double metal composite pipe production technology and its rapid development.For highly corrosive, high wear, high operating pressure fluid conduit environment, often using high-quality stainless steel or high alloy content of seamless steel pipes due to the large number of such alloying elements, the price of an ordinary seamless steel pipe several times or several times. Over the years, pipe users and manufacturers have been trying to find a composite of different metals, resulting in a harsh environment that meets, and cheap, high-performance composite pipe. Large diameter seamless steel bimetal composite materials can maximize complementary advantages, saving alloying elements, reduce project costs, while ensuring the basis of the performance of the primordia tube to improve the corrosion resistance of the pipe, wear resistance, extend the life of the pipeline, is an alternative product of pure stainless steel, brass or other corrosion-resistant alloy tube. Since the large-diameter seamless steel bimetal composite has excellent overall performance, so since the 1960s, Japan, the United States, Germany, Britain and the former Soviet Union and other countries attach great importance to the development and use of composite pipe, from the production process, the use of performance , the method for testing a large number of studies. At present, foreign bimetal composite pipe production technology has been maturing, Japan, USA, UK, Sweden, Germany and other countries in the lead. Composite pipe has gained wide recognition in corrosive petroleum, petrochemical companies, the nuclear industry as well as pharmaceutical, food processing and other fields, but also through the inner composite wear-resistant metal to meet pulverized coal power plants, mining ore and tailings slurry transportation high wear requires work environment. The late start of domestic technology level is relatively backward.The main process for many complex methods such as hot-rolled, hot extruded composites, casting a composite method, explosive welding composite method, combined bimetal composite pipe production methods, laser cladding method. Japan came from behind in technology development. According to the literature, in Japan in the early 1980s, a succession of research and development of a variety of complex processes. Typical of hot-rolled or hot-rolled cold-forming process can be applied to achieve metallurgical coating material and the substrate interface combined with excellent quality. Its products are widely used in petrochemical, chemical industry, oil and gas industries.