Guangdong Provincial Electricity Authority had done the first welding training center Φ42 mm × T91 trails 5mm tube butt welding procedure qualification. Preheating temperature taken to 200 ℃ t91, after welding cooled to 150 ℃, tempering heat 1h, the tempering temperature is 750 ~ 780 ℃, insulation 1h, heating and cooling rate of less than 5 ℃ / min. After welding, visual inspection of the specimens, the fracture inspection, non-destructive testing, tensile and bending tests, the results are satisfactory, it also shows that the welding process is effective. The welding process has been applied to 200 MW, 300MW boiler manufacturing practice, and achieved satisfactory results, and obtain greater economic benefits. Pipe is a hollow section, no seams around the long bar of steel. Steel hollow section, a large number of pipes used for transporting fluids, such as transportation of oil, gas, gas, water and some solid materials, pipes and so on. Such as steel and solid steel bar, compared with the same torsional strength in bending t91 steel, lighter, is an economic cross-section steel, widely used in the manufacture of structural parts and mechanical parts, such as drill pipe, automotive transmission , bicycle frames and construction using steel scaffolding. The ring with a steel pipe manufacturing parts, can improve material utilization Shanghai t91 alloy tube, simplify the manufacturing process, saving materials and processing time, such as bearing rings, jack sets, has been widely used to manufacture steel. Steel or a variety of conventional weapons indispensable material, barrel, barrel, etc. to make steel. Steel shapes in different cross-sectional area can be divided into tube and shaped tubes. Because in the perimeter of equal conditions, the largest area of ??a circle import t91 alloy tube, with a 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. Alloy pipe weight formula: [(OD - Wall Thickness) * thickness] * 0.02466 = kg / m (weight per meter) Shanghai t91 alloy tube | Xianning t91 | Katherine source of steel provided by Liaocheng Katherine source Pipe Co., Ltd. . Liaocheng Katherine source Pipe Co., Ltd. (www.lczygg.com) strong, credible, Liaocheng in Shandong steel industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving Katherine source of innovative ideas will lead pipe and you work into the brilliant, for a better future!