Welcome to Shandong Baopu Metal Products Co., Ltd.
Steel Pipe Elbow
Category：
Pipe fitting
Key Words：
Pipe fitting
Steel Pipe Elbow
Seamless Elbow Manufacturing Process (Heat Bending & Cold Bending)
One of the most common methods for manufacturing elbows is using hot mandrel bending from straight steel pipes. After heating the steel pipe at a elevated temperature, the pipe is pushed, expanded, bended by the inner tools of mandrel step by step. Applying hot mandrel bending can manufacture a wide size range seamless elbow. The characteristics of mandrel bending are strongely depend on the intergrated shape and dimensions of the mandrel. The using advantages of hot bending elbows include smaller thickness deviation and stronger bending radius than other bending methond type. Meanwhile, using bending instead of prefabricated bends substantially reduces the number of welds needed. This reduces the amount of work required and increases the quality and usability of pipes. However, cold bending is the process to bent the straight steel pipe at normal temperatures in a bending machine. Cold bending is suitable for pipes with an outer diameter of 17.0 to 219.1 mm, and wall thickness 2.0 to 28.0 mm. The recommended bending radius is 2.5 x Do. Normally at a bending radius of 40D. By using cold bending, we can get small radius elbows, but we need to pack the internals with sand to prevent wrinkling. Cold bending is a quick and inexpensive bending method. It is a competitive option for making pipelines and machine parts.
Welded Elbow Manufacturing Process (Small & Large)
Welded 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 elbow. It is the old production method of the elbows. Recent years the small sizes elbows are almost manufactured from the steel pipes now. For the big size elbows, for example, it is very difficult to produce elbows over 36” OD from the steel pipes . So it is commonly made from the steel plates, pressing the plate to the shape of half elbow, and welding the two halves together. Since the elbows are welded in its body , the inspection of the welding joint is necessary . Commonly we use the X-Ray inspection as the NDT.
PACKING AND SHIPPING
The company has main production lines such as pickling, cold rolling, hot-dip galvanizing, hot-dip galvanizing, thick plate galvanizing, and color coating, forming an annual output of 1 million tons of pickling coils, 1 million tons of cold-rolled steel sheets, and 900,000 tons of hot-dip steel sheets. The scale of galvanized and hot-dip aluminum-zinc-silicon steel sheets, 450,000 tons of thick galvanized steel sheets, and 300,000 tons of color-coated steel sheets. It is one of the largest suppliers of steel and non-ferrous metal smelting and processing in Shandong Province.
FACTORY
Shandong Baopu Metal Products Co., Ltd. was established in March 2010. It is a comprehensive large-scale enterprise integrating coating products and various steel processing and production, warehousing, distribution, and foreign trade sales.
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Tel : +86-13455162832
WhatsApp : +86-13455162832
Wechat : 13455162832
Email : admin@sdbaopumetal.com
Address : Liaocheng Economic and Technological Development Zone, Shandong Province ,China
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