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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.
We export butt weld fitting< for petroleum, chemical, water supply system and fabrication industry.
This fitting is design to use in moderate and high temperature service.
Butt weld Pipe Caps are available in a wide range of dimensions and materials that are complied
with national and international standards and grades.
Long Radius Elbow. Best-selling 45 Degree Long Radius Elbow Pipe Fittings in low temperature carbon steel,
with complete size and high reputation, to meet your demands.
The most applied version is 45 degree or 90 degree long radius elbows.
Long radius type is frequently adopted if no radius is indicated.
Our flagship products include Pipes, Flanges, Fittings like Bends, Elbows, Tees, Reducers, Caps, forged fittings,
Bolt and nuts, Gaskets, Profiles etc conforming to all Nationally & Internationally accepted standards.
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