VR
ELBOW
Steel Pipe Elbow
Pipe Elbow
Stainless Steel Elbow
ELBOW
Steel Pipe Elbow
Pipe Elbow
Stainless Steel Elbow

ELBOW

One of the most common methods for manufacturing elbows is using hot mandrel bending from straight steel pipes.
Bending Radius:R=1D~10D, R=15D, R=20D
Ends :Square Ends/Plain Ends (straight cut, saw cut, torch cut), Beveled/Threaded Ends
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Technical data
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Product introduction
Keywords(pipe type):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
Description
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.
Technical data
Nominal pipe size Outside Diameter
at Bevel
Center to End Center to Center Back to Faces
45°Elbows 90°Elbows 180°Return
H F P K
DN INCH Series A Series B LR LR SR LR SR LR SR
15 1/2 21.3 18 16 38 - 76 - 48 -
20 3/4 26.9 25 16 38 - 76 - 51 -
25 1 33.7 32 16 38 25 76 51 56 41
32 11/4 42.4 38 20 48 32 95 64 70 52
40 11/2 48.3 45 24 57 38 114 76 83 62
50 2 60.3 57 32 76 51 152 102 106 81
65 21/2 76.1(73) 76 40 95 64 191 127 132 100
80 3 88.9 89 47 114 76 229 152 159 121
90 31/2 101.6 - 55 133 89 267 178 184 140
100 4 114.3 108 63 152 102 305 203 210 159
125 5 139.7 133 79 190 127 381 254 262 197
150 6 168.3 159 95 229 152 457 305 313 237
200 8 219.1 219 126 305 203 610 406 414 313
250 10 273.0 273 158 381 254 762 508 518 391
300 12 323.9 325 189 457 305 914 610 619 467
350 14 355.6 377 221 533 356 1067 711 711 533
400 16 406.4 426 253 610 406 1219 813 813 610
450 18 457.2 478 284 686 457 1372 914 914 686
500 20 508.0 529 316 762 508 1524 1016 1016 762
550 22 559 - 347 838 559 Note:
1. Do not use the figures in the parenthesis as far as possible
2. Please first select A series.
600 24 610 630 379 914 610
650 26 660 - 410 991 660
700 28 711 720 442 1067 711
750 30 762 - 473 1143 762
800 32 813 820 505 1219 813
850 34 864 - 537 1295 864
900 36 914 920 568 1372 914
950 38 965 - 600 1448 965
1000 40 1016 1020 631 1524 1016
1050 42 1067 - 663 1600 1067
1100 44 1118 1120 694 1676 1118
1150 46 1168 - 726 1753 1168
1200 48 1220 1220 758 1829 1219
Standard
ASTM A234
This specification covers wrought carbon steel & alloy steel fittings of seamless and welded construction. Unless seamless or welded construction is specified in order, either may be furnished at the option of the supplier. All welded construction fittings as per this standard are supplied with 100% radiography. Under ASTM A234, several grades are available depending upon chemical composition. Selection would depend upon pipe material connected to these fittings.
Some of the grades available under this specification and corresponding connected pipe material specification are listed below:
Tensile Requirements WPB WPC, WP11CL2 WP11CL1 WP11CL3
Tensile Strength, min, ksi[MPa] 60-85 70-95 60-85 75-100
(0.2% offset or 0.5% extension-under-load) [415-585] [485-655] [415-585] [520-690]
Yield Strength, min, ksi[MPa] 32 40 30 45
[240] [275] [205] [310]

ASTM A403
This specification covers two general classes, WP & CR, of wrought austenitic stainless steel fittings of seamless and welded construction.
Class WP fittings are manufactured to the requirements of ASME B16.9 & ASME B16.28 and are subdivided into three subclasses as follows:
WP – SManufactured from seamless product by a seamless method of manufacture.
WP – W These fittings contain welds and all welds made by the fitting manufacturer including starting pipe weld if the pipe was welded with the addition of filler material are radiographed. However no radiography is done for the starting pipe weld if the pipe was welded without the addition of filler material.
WP-WX These fittings contain welds and all welds whether made by the fitting manufacturer or by the starting material manufacturer are radiographed.
Class CR fittings are manufactured to the requirements of MSS-SP-43 and do not require non-destructive examination.
Under ASTM A403 several grades are available depending upon chemical composition. Selection would depend upon pipe material connected to these fittings. Some of the grades available under this specification and corresponding connected pipe material specification are listed below:

ASTM A420
This specification covers wrought carbon steel and alloy steel fittings of seamless & welded construction intended for use at low temperatures. It covers four grades WPL6, WPL9, WPL3 & WPL8 depending upon chemical composition. Fittings WPL6 are impact tested at temp – 50° C, WPL9 at -75° C, WPL3 at -100° C and WPL8 at -195° C temperature.
The allowable pressure ratings for fittings may be calculated as for straight seamless pipe in accordance with the rules established in the applicable section of ASME B31.3.
The pipe wall thickness and material type shall be that with which the fittings have been ordered to be used, their identity on the fittings is in lieu of pressure rating markings.
Steel No. Type Chemical composition
C Si S P Mn Cr Ni Mo Other ób ós δ5 HB
WPL6 0.3 0.15-0.3 0.04 0.035 0.6-1.35 0.3 0.4 0.12 Cb:0.02;V:0.08 415-585 240 22    
WPL9 0.2   0.03 0.03 0.4-1.06   1.6-2.24     435-610 315 20    
WPL3 0.2 0.13-0.37 0.05 0.05 0.31-0.64   3.2-3.8     450-620 240 22    
WPL8 0.13 0.13-0.37 0.03 0.03 0.9   8.4-9.6     690-865 515 16    
Painting & Coating
 Light Oiling, Black Painting, Galvanizing, PE /3PE Anti-corrosion Coating

Packing & Loading
Packed in Wood Cabins/Wood Tray












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