Carbon Steel Flange Grade

Flange flange is mainly used for the connection of pipelines. When the pipelines that need to be connected are various mounting flanges, wire flanges can be used for low-pressure pipelines, and welding flanges can be used with pressures above 4 kg. Add a sealing point between the two flanges and then reinforce them with bolts. Flanges for different pressures have different thicknesses and use different bolts. Commonly used standards for 20# flange include national standard, American standard, Japanese standard, German standard, British standard and French standard. Evaluate industries such as petroleum, natural gas, chemical industry, electric power, metallurgy, pharmaceuticals, shipbuilding, and urban construction. Usually, the surface of the anti-rust flange is electroplated (yellow zinc, white zinc, etc.), or treated with anti-rust oil and spray anti-rust paint. The production process of 20# flange includes forging, casting, medium plate rolling, medium plate cutting, etc. Among them, forging products have the highest price, medium plate products have the second highest price, and casting products have the lowest price. In terms of quality, forged is the best, rolled is second, and cast is third. However, the diameter of forgings is generally smaller