These elbows are made from the steel plates, so it is not seamless steel elbows, use a mould and press the steel plate to the shape of the elbow, then weld the seam to be a finish steel elbows, it is the old production method of the elbows. Recent years the small sizes elbows are almost manufactured from the steel pipes now.
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Yaang Pipe Industry Co., Ltd. is an international supplier of piping solutions for flange, butt welding fittings, socket welding fittings and threaded fittings. Our products are widely used in different industrial fields, including oil and gas, chemical industry, petrochemical industry, power plant, pulp and paper industry, environmental and water conservancy engineering, engineering projects, etc.