Alloy steel tube is mainly used for power plant, nuclear power plant, high pressure boiler, high temperature superheater and reheater and other high pressure and high temperature pipeline and equipment, it is made of high quality carbon steel, alloy structure steel and stainless heat resistant steel material, by hot rolling (extrusion, expansion) or cold rolling (pull out). Advantages can be 100% recycled, in line with the national strategy of environmental protection, energy conservation, resource conservation, national policy to encourage the expansion of the application of high pressure alloy tube. At present, the proportion of alloy tube consumption in total steel is only half of that in developed countries. According to the study of the expert group of alloy pipe branch of China special steel association, the annual growth of China's high pressure alloy pipe long material demand can reach 10-12% in the future. The connection and difference between the seamless tube and the alloy tube is defined according to the production material (that is, the material), as the name suggests is made of alloy tube; Seamless pipe is defined according to the production process (seamless), which is different from seamless pipe is seamless pipe, including straight welded pipe and spiral welded pipe. The standard alloy pipe has hollow section and is widely used for conveying fluid, such as oil, natural gas, gas, water, machining, and some solid materials. Compared with solid steel such as round steel, alloy steel tube is a kind of economical section steel with the same bending and torsional strength and lighter weight. It is widely used in manufacturing structural parts and mechanical parts, such as petroleum drill pipe, automobile transmission shaft, bicycle frame and steel scaffolding used in construction. Using alloy steel tube to make annular parts can improve the material utilization rate, simplify the manufacturing process, save materials and processing time, such as rolling bearing ring, jack sleeve, etc. Alloy steel pipe is also an indispensable material for all kinds of conventional weapons. The alloy steel pipe can be divided into circular pipe and special pipe according to the different shape of cross section area. Since the area of the circle * is equal to the circumference, more fluid can be transported with the circular tube. In addition, when the ring section is subjected to internal or external radial pressure, the force is more uniform, so the vast majority of steel tubes are round.
The alloy pipes are large-diameter alloy pipes, thick-wall alloy pipes, high-pressure alloy pipes, alloy flanges, alloy elbows, P91 alloy pipes and seamless steel pipes. In addition, special fertilizer pipes are also very common.
Alloy pipe is a kind of seamless steel pipe, which is divided into seamless pipe for structure and high pressure heat-resistant Alloy pipe. It is different from the production standard and industry of alloy tube. Meet the required processing conditions. Its performance is higher than the general seamless steel tube variable use value, alloy pipe chemical composition containing Cr more, high temperature, low temperature, corrosion resistance. Common carbon seamless pipe does not contain alloy composition or alloy composition is very small, alloy pipe in petroleum, aerospace, chemical, electric power, boiler, military industry and other industries are widely used because of the mechanical properties of alloy pipe change good adjustment.