Elbow
Elbow
Elbow
Elbow
Elbow
Elbow
Elbow

Elbow

Model NO.:
ASME B16.9, ASTM A234 WPB, ASTM A403 304/304L, ASTM A234 WP1/5/9/11/12/22/91
Keywords: 45 Degree/90 Degree/180 Degree Elbow, Long Radius/Short Radius Elbow
Size: NPS: 1/2''~24''(Seamless), 24''~72''(Welded) ;DN: 15~1200, WT: 2~80mm, SCH 5~XXS
Bending Radius: R=1D~10D, R=15D, R=20D
Material & Standard: Carbon Steel --- ASME B16.9, ASTM A234 WPB Stainless Steel --- ASTM A403 304/304L/310/310S/316/316L/317L/321 Alloy Steel --- ASTM A234 WP1/5/9/11/12/22/91
Ends: Square Ends/Plain Ends (straight cut, saw cut, torch cut), Beveled/Threaded Ends
Delivery : Within 30 days and Depends on your order quantity
Payment: TT, LC , OA , D/P
Packing: Packed in Wood Cabins/Wood Tray
Usage: For conveying gas, water and oil either in the oil or natural gas industries
Quantity:

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, bend 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 strongly depend on the integral shape and dimensions of the mandrel. The using advantages of hot bending elbows include smaller thickness deviation and stronger bending radius than other bending method 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.

Elbow-01

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