Liaocheng in Shandong Steel Pipe Manufacturing Co., Polygram company's main products: electricity, petroleum, chemical, container, boiler industry with, American standard steel pipe, seamless pipe, line pipe, casing, spiral, straight seam pipe, high alloy pipe , high-pressure boiler tubes, high-pressure boiler seamless steel tubes threaded, low pressure boiler tubes, diesel engine with high-pressure seamless pipe, fertilizer equipment with high-pressure seamless pipe, petroleum cracking high-pressure seamless pipe, ship carbon steel and carbon-manganese seamless tube, hydraulic prop cars sleeve pipe, transmission fluid line pipe, structural pipe, coal mine hydraulic prop tube, cold-rolled precision light tube, precision light pipe looks smooth, uniform thickness, high precision. 1, the hydraulic test: steel hydraulic test should be gradual, with no penetration. Formula formula: P = 2SR / DP- test pressure (Mpa) S --- nominal pipe wall thickness (mm) D- pipe nominal diameter (mm) R- allowable stress 2, flattening test: diameter greater than 22mm, and pipe wall thickness less than 10mm were flattening test, the formula is: H = (1 + a) S / a + S / DH- plane distance S --- nominal pipe wall thickness D --- nominal diameter steel pipe a- unit length deformation coefficient of 0.08, when the S / D greater than or equal 1.25 0.07, flattening test shall not have cracks and cracks. 4, bending test: 22mm outer diameter less than or equal pipe bending test should be carried out, bending angle of 90 degrees, the apex radius of 6 times the pipe diameter, the bend may not cracks and cracks. Shandong Liaocheng Polygram steel plant is in production, scientific research, import and export trade and integration of large enterprises, the main high-pressure boiler, internal thread boiler tubes, seamless steel pipe, seamless pipe, small diameter seamless steel pipe, steel pipe, thick walled seamless steel pipe. Ship Recycling under the angle more than expected. Professional production and sales blank flange, flange. Selling large quantities of high-quality scrap, scrap. Company cash reserves of more than ten thousand tons, of which more than five thousand specifications of electrical pipes, high pressure boiler pipe, oil cracking pipe, low pressure boiler tube, fluid pipe, structural pipe, line pipe. The company responded positively to national policies that support the western development. He was awarded the domestic boiler industry association "Association of Chinese boiler designated procurement units." In cooperation are: Baosteel Group, Baotou Steel Group, Anshan Iron and Steel, Tianjin Steel Co., the rule of Steel Group, Handan Iron and Steel, Xining Special Steel, Wuhan Iron and Steel Group and Jinan Iron and Steel Group and other major steel mills was named Dealer, recognized 104 ton-level agents. Since its establishment, adhere to the "integrity first, the supply of the first" principle, the capillary seamless steel pipe manufacturers, "would rather own hardships, let customers sometimes difficult," the spirit of service, the quality of competition in the market with steel Precision capillary seamless steel tubes, iron commitment, sound service system, to win the favor of customers. Let us sincerely work together, capillary seamless steel pipe plant, common development and create a brilliant future! Why are threaded with inner tube boiler tube with a hollow cross section with a lot of transportation, largely used as pipeline fluids, such as transportation of oil, natural gas, gas, water and some solid materials, pipes and so on. And other high-pressure boiler pipe and solid steel bar, compared to the same torsional strength in bending, lighter, high-pressure boiler pipe is an economic cross-section steel, widely used in the manufacture of structural parts and mechanical parts, such as drill pipe, automotive drive shafts, bicycle frames and construction using steel scaffolding. High-pressure boiler pipe manufacturing ring parts Can improve material utilization, simplify the manufacturing process, saving materials and processing time, capillary seamless, such as bearing rings, jack sets, has been widely used to manufacture steel. Internal thread high-pressure boiler tube or barrel ,, indispensable material would have to make steel. High-pressure boiler tubes threaded according to different cross-section shapes can be divided into tube and shaped tubes. Since in perimeter of equal conditions, the largest area of ??a circle, with the circular tube can carry more fluid. In addition, the circular cross section to withstand internal or external radial pressure, the force is uniform, so the vast majority of pipe is pipe. The above information is provided for you by the Shandong Liaocheng Steel Pipe Manufacturing Co. Polygram. Capillary seamless steel tubes, seamless steel pipe 20 # capillary capillary seamless steel pipe manufactured by Shandong Steel Pipe Manufacturing Co., Ltd. Liaocheng Polygram. Liaocheng in Shandong Steel Pipe Manufacturing Co. Polygram (www.lcbljgg.com) (www.lcbljgg.com) (www.sdlcblj.com) (www.bljggzz.com) Shandong Liaocheng, wire, pipe, plate manufacturing equipment leaders, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Polygram steel leader with the staff warmly welcome all inquiries negotiations to create Polygram steel better future.