Flat welding flange (chemical standard HG20592, national standard GB/T9119, mechanical JB/T81) : easy to draw, simple to make, low cost and wide use; However, the rigidity is poor, so it must not be used in the occasion of supply and demand, flammable, explosive and high vacuum degree requirements of chemical process piping system and height and extreme harm. The cover type has plane and surface.

Plate-type flat welding flange is a common flange. Pressure is PN2.5, PN6, PN10, PN16, PN25.

Welding form: plate level welding flange is to insert the pipe into the flange to weld.

The material of flat welding flange: 201304316. 316 l. 0 cr18ni9. 321.202, carbon steel, 20 #, 20 g, and alloy steel, etc

National standard of the flange of the another meaning is: according to the national standard size, tolerance range, such as the production of flange, apart from not according to the standard size production of flange piece also said two standard flange (someone called non-standard flange is not correct), usually some unscrupulous merchants will reduce two flange thickness, diameter size to achieve the purpose of saving material, and made from scrap steel and scrap steel flange, is usually the steel chemical composition and mechanical properties of substandard waste, moreover steelmaking production flange with black steel private, the private steel steelmaking technology using old, there is no guarantee that the mechanical properties and welding performance, use which may not be able to and steel pipe welding, such as cracks, porosity or steel itself will leak after welding. So when buying the flange, choose the national standard flange. If the funds are limited to 2 standard flanges, you should carefully observe and measure the flange dimensions to avoid being fooled.

Due to the plate flat welding flange with good comprehensive performance, so it is widely used in chemical industry, building, water supply, water drainage, oil, light and heavy industry, frozen, sanitary, plumbing, fire protection, electric power, aerospace, shipbuilding and other basic engineering.