There are cold coil and hot coil. After being processed into a circle, the water line, bolt hole and seam are processed. This is generally a large flange, which can be formed up to 7 meters at a time. Most of them are plate type flat welding flanges, and the connection method is welding. If the production process of segmented production is used, the specifications of 12m-15m or more can be achieved. This kind of flange has good quality assurance. Because the raw material is medium plate, the density is good. The welding process at the interface of the rolled flange is the most important, and X-ray or ultrasonic film inspection shall be conducted. After the interface is completed, the material of the whole flange will be free from problems. Relatively speaking, the price of processed products with thin thickness, light weight, narrow one side of the product and some sealing grooves is higher, while the price of rolled flanges with thick thickness, heavy weight and no very complicated processing process is lower.
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