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Surface Treatment and Protection of Elbow Fittings

Aug. 10, 2020

The elbow is suitable for a pipe fitting at the turn of the pipeline. It can be divided into seamless elbow and straight seam elbow according to different welding methods. The specific forming process and production process of the push elbow need to be produced in a certain space and site, and follow certain procedures and process standards for production. Carbon steel elbows are suitable for pipeline systems in petroleum, natural gas, chemical, hydropower, construction and boiler industries. According to the angle, there are three most commonly used ones: 45°, 90°, and 180°. In addition, it also includes other abnormal angle elbows such as 60° according to engineering needs. The elbow materials are cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, non-ferrous metals and plastics.

The ways to connect with the pipe are: direct welding (the most common way) flange connection, hot melt connection, electrofusion connection, threaded connection and socket connection, etc. According to the production process, it can be divided into: welding elbow, stamping elbow, push elbow, casting elbow, butt welding elbow, etc. Other names: 90 degree elbow, right angle bend, etc.


Surface treatment and protection of elbow fittings

The surface treatment of pipe fittings is usually carried out by sandblasting, shot blasting, sanding, pickling and other methods to remove rust and scratches on the surface of the product, so that the product can reach a smooth surface and meet the requirements of subsequent processing and inspection.

The surface hardness of pipe fittings that are surface treated by shot blasting will increase slightly.

The surface protection of carbon steel and alloy steel pipes is usually painted, and the stainless steel is passivated after pickling (passivation is not necessary for all stainless steel pipes that are cut on the surface). The main purpose of surface protection of pipe fittings is anti-corrosion, while also achieving the effect of beautiful appearance of the product. Usually, the ordering party puts forward specific requirements for surface protection, and the 30° elbow manufacturer completes the protection of the pipe fitting surface according to the ordering party's requirements.


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