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Difference between seamless elbow and stamping elbow

Update:30 Nov 2018

The most common production data for seamless elbows is […]

The most common production data for seamless elbows is seamless steel pipe. The elbow tube blank is cut by using water knife cutting, hot cutting, etc., and is selected by the intermediate frequency pushing machine, and then shaped by a hot press, followed by groove, non-destructive testing and the like. After the factory, the data of the rolling seamless elbow pipe fittings is a round tube blank, which is cut into a billet of about one meter in length by cutting and cutting, and sent to the furnace for heating through a conveyor belt. It is heated into the furnace and the temperature is about 1200 ° C. The temperature control in the furnace is a key question. After the round billet is released, it must pass through the pressure puncher. The fuel is hydrogen or acetylene. It is always a seamless elbow. The pressure is much stronger than the punching elbow, but the diameter of the seamless elbow is mostly less than 630mm. The latest medium-frequency pusher of our company can reach a maximum diameter of 1200mm, but the cost of seamless elbows of more than 630mm is often very high. These large-diameter elbows often use straight-slit elbows, that is, punching elbows.

The original material used for the stamping elbow is steel plate (maybe the billet does not introduce this kind of production process here). After the hot-cutting is used to cut the steel sheet into a fan shape, the heat-treated steel plate is restricted by the press with the corresponding pressure level. The elbow blank limited to a semicircular shape is welded and formed by precise cutting, the production efficiency of the stamping process is high, and the operation is convenient, and the mechanization and automation are easily completed. This is because the stamping is done by the die and the punching equipment, and the general press The number of trips can reach dozens of times per minute, the high-speed pressure can reach hundreds or even thousands of times per minute, and each stamping stroke may result in a stamping part. Generally, no stamping and scraping is generated in the stamping, and the data is consumed. Less, and no need for other heating equipment, it is a material-saving, energy-saving processing method, the cost of stamping parts is lower. The raw materials for stamping elbows are carbon steel, stainless steel, alloy steel and other raw materials. The carbon steel stamping elbow is cheap and has a large amount of application. The elbow of alloy steel is used in a special orientation. Generally, the punching elbow needs to be non-destructively tested by welding before it can be sold at the factory. This is one of the commonly used stamping elbows. It is worth mentioning here that we often hear a noun called a fake seamless elbow, that is, the two welds of the stamping elbow are processed by a series of treatments such as sandblasting to remove the weld on the stamping elbow. Instead of a seamless elbow for sale, it is generally much cheaper than a seamless elbow.

The two elbows are different, not one, but there are also coincident locals. The manufacture of elbows is divided into welding, stamping, pushing and casting. Seamless refers to the elbows that are made of seamless steel tubes without welds, not welded elbows, and stamped straight seams. Head and seamless stamping elbow, the nature of the tube embryo is resolved.