Scope of application and industry of bimetal composite wear-resistant pipe
The corrosion resistant materials such as stainless steel, Incoloy625 and Incoloy825 are usually used as the inner layer pipes to ensure the corrosion resistance of the pipeline. However, the outer layer materials are usually X42, X50, X60, X70, ASTM-A106GB, A335-P22 and other materials to ensure the strength of the pipeline. The composite steel pipe composed of these two types of materials is also suitable for the development of geothermal water intake pipelines. In terms of thermal power generation, Japan, the United States, Europe and other countries are developing ultra-high temperature and ultra-high pressure boilers. Sumitomo Metal Company uses SUS310S, 35 Cr-55Ni, 40 Cr-55Ni material as the outer layer base tube, 17-14 CuMo and Alloy800H materials as the inner layer tube, and develops a new composite tube for supersupercritical boiler superheater by metallurgical combination method. Sweden Sandvik has successfully developed carbon steel as inner layer, Sanicro28 steel with good corrosion resistance as outer layer, and made composite steel pipe through metallurgical combination. As chemical corrosion resistance pipeline, besides should have special medium corrosion resistance, also should have a high strength and stiffness, so this kind of composite steel pipe with base material is usually carbon steel, low alloy or corrosion resistant steel, and the layer according to different corrosion resistant medium can choose stainless steel, copper and its alloy and niobium, tantalum and titanium, etc. Japan and the United Kingdom use a large proportion of composite steel pipes in this field. The composite steel pipe as incinerator superheater pipe is ideal, the outer base pipe can be selected with incineration high temperature resistance and corrosion resistance atmosphere materials (such as Sanicro65 alloy), the inner layer can choose carbon steel or chromium and molybdenum steel with stress corrosion resistance crack, Europe, the United States and other widely used since 1971. Sweden Sandvik choose high alloy nickel chromium steel UNSN08800 as inner pipe, with low alloy steel or ordinary boiler ASTMA213Ti2 for outer tube production heat exchanger composite steel pipe, has good thermal conductivity and excellent internal and external corrosion resistance, and maintain the low alloy steel good processing performance, desalination device of water intake pipe or seawater heat exchanger pipe can choose seawater corrosion resistant materials such as nickel, titanium, stainless steel or copper alloy lining, with carbon steel or low alloy corrosion resistant steel outer composite steel pipe. Wear-resistant composite steel pipe is used in high wear working environment such as power plant coal powder, mine powder and tailings slurry conveying, which can be made with SUS316L corrosion-resistant steel and wear-resistant alloy as inner layer.
