Seamless tube specification: 6-1240×1-200mm Seamless pipe manufacturing process: hot rolling, cold drawing, thermal expansion in 2000, the seamless pipe national apparent consumption of 4.180 million tons, of which the domestic supply of 3.821 million tons, accounting for 91.4% of total domestic demand. Imports were 359,000 tons, accounting for 8.59% of the total domestic demand. In the same year, the consumption of petroleum pipes was about 910,000 tons. About 252,000 tons of imports. Imported pipes account for about 70% of total domestic consumption, of which imports account for 27.69% of total domestic consumption, and imports of petroleum pipes account for about 70% of total seamless imports. The oil pipes imported from Japan account for more than half of the total imports. China’s largest oil casing production base—Tianjin Steel Pipe Co., Ltd.’s steel tube products in 2000 was 520,200 tons, of which oil casing production was 364,100 tons. Casing accounts for more than half of the country’s oil production. In terms of both output and sales volume, they account for the first place in China's casing market. From both international and domestic markets, the existing production capacity of seamless pipes (including oil-specific pipes) has exceeded the demand. Therefore, the focus in the future should be on fully utilizing the capabilities of existing generating units to develop high-strength grades, high resistance to damage, high corrosion resistant oil pipes, high pressure boiler tubes, and gas cylinder tubes. It is also the content of the country's optimization of product structure for the current steel market in China. This is also the key to increasing the competitiveness of domestic and foreign products and expanding market share. In other words, improving the market competitiveness of domestic steel pipe companies is the key to the long-term tasks and successful development of domestic companies after the WTO. The calculation formula of seamless management theory: (outside diameter and wall thickness)×wall thickness×0.02466= seamless tube per meter weight The fluid tube is a tubeless steel tube with a hollow cross section from head to tail. The manufacture of ring-shaped parts from steel tubes can increase material utilization, simplify the manufacturing process, save material and processing man-hours, such as rolling bearing rings, jack sleeves, etc. Currently, steel tubes have been widely used for manufacturing. The steel pipe is also an indispensable material for various conventional weapons. The barrels, barrels, etc. must be made of steel pipes. Steel tubes can be divided into round tubes and shaped tubes according to the shape of the cross-sectional area. Since the circle area is the largest under the condition of the same circumference, more fluid can be transported by the circular tube. In addition, when the ring section is subjected to internal or external radial pressure, the force is more uniform. Therefore, most steel pipes are round pipes. Fluid tube weight formula: [(outer diameter - wall thickness) * wall thickness] * 0.02466 = kg/meter (weight per meter).