Flange, carbon steel welded flange, Hebei billion gold piping flanges are provided by professional production pipeline Hebei billion gold. Pipeline Manufacturing Co., Ltd. Hebei billion in gold (www.yijinguanjian.com) is Hebei Cangzhou quality certified company Commercial Union, with Hebei billion gold piping and other brands, has a good reputation, honesty, service-oriented "business alliance customer clicks on the page "Icons, we will be happy to serve you! Pressure technical conditions specified in this standard PN markers and markers into Class mark. PN labeled with 12 pressure levels were: PN2.5; PN6; PN10; PN16; PN25; PN40; PN63; PN100; PN160; PN250; PN320; PN400Class marked with six pressure levels were: Class 150; Class 300; Class 600; Class 900; Class 1500; Class 2500 GB flange another layer of meaning: In accordance with the requirements of national standard dimensions, tolerances and other production flange, different from the standard sizes do not produce flanges, also known as two standard flange (someone called non-standard flange is incorrect), some unscrupulous merchants will usually reduce the flange thickness, diameter size to achieve the purpose of saving the two materials, as well as with scrap steel or scrap steel processing method Portland, this steel is usually the chemical composition and mechanical properties of non-compliance of the waste, some even with private black steel flange steel production, steel making technology used in this private obsolete steel mechanical properties can not be guaranteed and weldability There may not be time to use and pipe welding or steel itself for cracks, holes and other leaks will go after welding, so try to use the national standard flange flange time of purchase. If you must choose carefully observed under the limited funds two standard flange dimensions in order to avoid the situation and measures taken in the flange. When large diameter flanges tapping, tapping oil is also proportionate selection is important. In order to extend the life of the tap, progress thread processing quality, you should pay attention to the following points. Tapping oil contains large amounts of chloride additives, active sulfurized fatty oils and lubricant additives special steel welded flange, due particularly high lubricity, can effectively reduce the cutting temperature, for maximum cutting precision, have been successfully used in various difficulty cutting kinds of difficult to machine materials, such as stainless steel and heat-resistant steel, high-speed turning, drilling, tapping, broaching, hobbing and gear shaping, etc. Large diameter stainless steel flanges for special work better flange tapping oil can be used directly. Furthermore alloy flanges, tapping spirits and oil can also be used on their own configuration, but the ratio of fixed to the right. If tapping oil lubrication ineffective, then tapping the thread finish is poor, and tap tapping large resistance. Tapping oil must have good cooling, lubrication and rust-proof function. If tapping oil cooling effect is not good, then tap lightly sticky teeth, that tap thread and easy to bond stainless steel rake surface chips. Tapping oil for stainless steel, alloy steel, ferrous metals, non-ferrous metal products, tapping, tapping and other processes lubrication. For demanding high pressure welded flange tapping occasion manufacturers, also has efficient lubrication and cooling effect. Large-diameter flange common are butt welded flange and flange. Threaded flange is no big caliber. In reality, production and sales, or the proportion of welding products accounted for much more. Welding large diameter flanges and welded large-diameter flange structure and scope of the use of different, to show the features and benefits will be different, so when you want to use to use for different ranges, play an important role to ensure that the flange . Large-diameter flange applications: oil, gas, chemicals, utilities, construction and other industries boiler piping system. Large-diameter flange forming basic process: If necessary, a circular ring shell can be cut four or six 90 ○ 60 ○ elbow elbow elbow or other specifications, the process for the manufacture of the elbow in diameter and Any size larger than the inner diameter of the elbow bends greater than 1.5, is the ideal way to present the manufacture of large pressure elbow.