Production process of alloy steel blind flange

　　According to the size of the drawing, the theoretical weight of the alloy steel blind flange is calculated and analyzed carefully before the blind flange is manufactured. Finally, the following process is adopted

　　1. casting is the first process of alloy steel tube production.

　　ingredients: according to the needs of the production of specific alloy grades, calculate the addition of various alloy components, reasonable mix of various raw materials.

　　smelting: according to the technological requirements of alloy steel materials will be added to the smelting furnace melting, and through degassing, slag removal refining and other means to load the melt slag, gas effectively removed.

　　cast zirconium: alloy steel blind flange under certain casting conditions, through the deep well casting system, cooling cast into various specifications of round cast rods.

　　Extrusion: Extrusion is the means of forming profiles. First, according to the section design of profiles, ASME B16.5 Class 600lb Alloy Steel Blind Flange is manufactured, and the heated round cast rod is extruded from the mold by extrusion.

　　2coloring.

　　surface pretreatment: the use of chemical or physical methods to clean the surface of profiles, exposed pure matrix, in order to facilitate the acquisition of a complete, compact artificial oxide film. Mirrors or matte surfaces can also be obtained by mechanical means.

　　anodic oxidation: A dense, porous and strong adsorptive alloy steel blind flange was formed on the surface of the substrate by anodic oxidation of the surface pretreated profiles under certain technological conditions.

　　sealing: the pore of the porous oxide film formed by anodic oxidation is closed, so that the anti-pollution, corrosion resistance and wear resistance of the oxide film are enhanced. The oxide film is colorless and transparent. By using the strong adsorbability of the oxide film before sealing, some metal salts are adsorbed and deposited in the pores of the film.