Size: 1/2″-48″
Wall thickness: SCH5S-SCHXXS
Material: Special Alloy, Super Duplex Stainless Steel, Stainless Steel, Carbon Steel, Titanium
Standards: ASME B16.9, ASME B16.28, MSS SP43, MSS SP75
A 45 degree elbow is a kind of pipe fittings, which can change the flow direction of liquid or gas in the pipeline system. Its usage proportion can reach 70% and 80% in the pipeline fittings, and it occupies a considerable proportion in all the pipeline fittings. Therefore, it is very important in the pipeline. The main function of the elbow is to change the direction of the pipeline. All pipelines can not go all the way to the end, so the elbow is needed to turn. The most commonly used are 90° elbow, 45° elbow, 180° elbow, and special angle elbow, or long elbow, big elbow, etc. According to the actual needs of customers. Common production processes of stainless steel include push, pressing, forging and casting.
45° Elbow
The function of a 45° elbow is the same as a 90° elbow, but the measurement of dimensions is different to that of the 90° elbow.

The radius of a 45° elbow is the same as the radius of the 90° LR (1.1/2D). However, the center to face dimension is not equivalent to the radius as in 90° LR elbows. This is measured from each face to the point of intersection of the center lines perpendicular to each other, distances B on the image. This is due to the smaller degree of bend. Short radius 45° elbows are not available.
BUTTWELD ELBOW 45/90/180 DEGREE
ASME B16.9 buttweld elbows are manufactured in a wide range of dimensions (combinations of outside diameter and wall thickness) to fit ASME B36.10 and ASME B36.19 carbon, alloy and stainless steel pipes of any size between 2 and 48 inches (and above).
Buttweld elbows below 24 inches in diameter are produced by cutting, heating and bending seamless steel pipes; pipe elbows of larger sizes are manufactured, instead, from welded pipes or steel plates.
The three most common types of elbows in piping are the 45, 90, and 180 degrees (or return elbow), as shown in the image:
Some special types of pipe elbows are:
- reducing elbow: a pipe connector with an inlet and an outlet in two different bore sizes is used instead of the combination of a standard elbow and concentric reducer.
- mitered elbow: large size elbow assembled by joining steel plates
SHORT VS LONG RADIUS ELBOW
The center to face distance of a long radius pipe elbow is always 1.5 times the nominal pipe size, whereas, for a short radius pipe elbow, the center to face distance is equal to the nominal pipe size.
Example:
- For a 4 inches long radius (LR) butt weld elbow, the center to face distance is 4 x 25.4 x 1.5 = 152.4 mm;
- For a short radius butt weld elbow, the center to face distance is instead 4 x 25.4 x 1 = 101.6 mm. Short radius pipe elbows are available only for the 90 and 180-degree configuration (and not for the 45 degrees); instead, long radius elbows are available for all degrees.
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PIPE ELBOW MANUFACTURING PROCESS
Buttweld elbows 45 and 90 degrees can be manufactured in different ways, the main ones are the “mandrel process” and the “cold forming” (other methods are the elliptical forming and the double-seam welding method).
Mandrel Process
Cold forming
Quality Control
We have our own Physical & Chemical Testing Center Lab to guarantee our product quality. Our test items & instrument fully meet international standards.
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Charpy impact test
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Corrosion test
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PT penetration inspection
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Tensile test
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Ultrasonic wt testing
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Hardness test
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Dimension test
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High test
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Thickness test
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Alloy Analyzer (PMI)
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Application of 45° Elbow
- Pipe and Tubes for petrochemical industry
- Pharmaceutical industry
- Food industry
- Aviation and aerospace industry
- Architectural decoration industry
- Oil and Gas Pipeline industry
Dimensions Butt Weld Elbows 45°-90° LR and 3D ASME B16.9

NPS |
O.D. D |
90° Long Rad Center to End A |
45° Long Rad Center to End B |
90° 3D Center to End A |
45° 3D Center to End B |
1/2 | 21.3 | 38 | 16 | ||
3/4 | 26.7 | 38 | 19 | 57 | 24 |
1 | 33.4 | 38 | 22 | 76 | 31 |
1.1/4 | 42.2 | 48 | 25 | 95 | 39 |
1.1/2 | 48.3 | 57 | 29 | 114 | 47 |
2 | 60.3 | 76 | 35 | 152 | 63 |
2.1/2 | 73 | 95 | 44 | 190 | 79 |
3 | 88.9 | 114 | 51 | 229 | 95 |
3.1/2 | 101.6 | 133 | 57 | 267 | 111 |
4 | 114.3 | 152 | 64 | 305 | 127 |
5 | 141.3 | 190 | 79 | 381 | 157 |
6 | 168.3 | 229 | 95 | 457 | 189 |
8 | 219.1 | 305 | 127 | 610 | 252 |
10 | 273 | 381 | 159 | 762 | 316 |
12 | 323.8 | 457 | 190 | 914 | 378 |
14 | 355.6 | 533 | 222 | 1067 | 441 |
16 | 406.4 | 610 | 254 | 1219 | 505 |

NPS |
O.D. D |
90° Long Rad Center to End A |
45° Long Rad Center to End B |
90° 3D Center to End A |
45° 3D Center to End B |
18 | 457 | 686 | 286 | 1372 | 568 |
20 | 508 | 762 | 318 | 1524 | 632 |
22 | 559 | 838 | 343 | 1676 | 694 |
24 | 610 | 914 | 381 | 1829 | 757 |
26 | 660 | 991 | 406 | 1981 | 821 |
28 | 711 | 1067 | 438 | 2134 | 883 |
30 | 762 | 1143 | 470 | 2286 | 946 |
32 | 813 | 1219 | 502 | 2438 | 1010 |
34 | 864 | 1295 | 533 | 2591 | 1073 |
36 | 914 | 1372 | 565 | 2743 | 1135 |
38 | 965 | 1448 | 600 | 2896 | 1200 |
40 | 1016 | 1524 | 632 | 3048 | 1264 |
42 | 1067 | 1600 | 660 | 3200 | 1326 |
44 | 1118 | 1676 | 695 | 3353 | 1389 |
46 | 1168 | 1753 | 727 | 3505 | 1453 |
48 | 1219 | 1829 | 759 | 3658 | 1516 |
Dimensions are in millimeters unless otherwise indicated. Wall thickness (t) must be specified by customer.
DIMENSIONAL TOLERANCES OF BUTT WELD ELBOWS – 45° AND 90° – LR AND 3D – ASME B16.9 –
Nominal Pipe Size | 1/2 to 2.1/2 | 3 to 3.1/2 | 4 | 5 to 8 |
Outside Diameter at Bevel (D) |
+ 1.6 – 0.8 |
1.6 | 1.6 |
+ 2.4 – 1.6 |
Inside Diameter at End | 0.8 | 1.6 | 1.6 | 1.6 |
Center to End LR (A/B) | 2 | 2 | 2 | 2 |
Center to End 3D (A/B) | 3 | 3 | 3 | 3 |
Nominal Pipe Size | 10 to 18 | 20 to 24 | 26 to 30 | 32 to 48 |
Outside Diameter at Bevel (D) |
+ 4 – 3.2 |
+ 6.4 – 4.8 |
+ 6.4 – 4.8 |
+ 6.4 – 4.8 |
Inside Diameter at End | 3.2 | 4.8 |
+ 6.4 – 4.8 |
+ 6.4 – 4.8 |
Center to End LR (A/B) | 2 | 2 | 3 | 5 |
Center to End 3D (A/B) | 3 | 3 | 6 | 6 |
Wall Thickness (t) | Not less than 87.5% of Nominal Wall Thickness |
Dimensional tolerances are in millimeters unless otherwise indicated and are equal ± except as noted.
Note:
MSS SP-43 only covers stainless steel buttweld fittings made for use with Schedule 5S and 10S pipe and Stub Ends suitable for use with Schedule 40S pipe, as defined in ASME B36.19. The dimensions and dimensional tolerances defined in MSS SP-43 are substantially the same as those in ASME B16.9 specifications from NPS 1/2 – NPS 24. Except with regard to the outside diameter at the bevel.
Material
Special Alloys
- HASTELLOY® X
- MONEL® R-405
- MONEL® K-500
- HASTELLOY® C-276
- HASTELLOY® C-22
- HASTELLOY® B-2
- INCOLOY® 825
- INCOLOY® 800H / 800HT®
- INCONEL® 718
- INCONEL® ALLOY 625
- INCONEL® ALLOY 601
- INCONEL® ALLOY 600
- MONEL® ALLOY 400
ALLOY 20
- NICKEL 200/201
- MONEL® R-405
- MONEL® K-500
- MONEL® ALLOY 400
- INCONEL® 718
- INCONEL® ALLOY 625
- INCONEL® ALLOY 601
- INCONEL® ALLOY 600
- INCOLOY® 825
- HASTELLOY® X
- HASTELLOY® C-276
- HASTELLOY® C-22
- HASTELLOY® B-2
- INCOLOY® 800H / 800HT®
- HASTELLOY® B-3
Duplex Stainless Steel
- ZERON® 100, SUPER DUPLEX STAINLESS STEEL
- Super Duplex S32760
- LDX 2101®, DUPLEX STEEL
- Duplex S31803
- SUPER DUPLEX 2507
- DUPLEX 2205
Stainless Steel
- STAINLESS STEEL NITRONIC 50HS
- STAINLESS STEEL NITRONIC 60
- STAINLESS STEEL NITRONIC 50
- STAINLESS STEEL 13-8PH
- STAINLESS STEEL 15-5PH
- STAINLESS STEEL PRODEC 303
- STAINLESS STEEL 303
- STAINLESS STEEL 446
- STAINLESS STEEL 410S
- STAINLESS STEEL 410
- STAINLESS STEEL 304-304H
- STAINLESS STEEL 17-4
- STAINLESS STEEL 347
- STAINLESS STEEL 440C
- STAINLESS STEEL 309
- STAINLESS STEEL 316-316l
- STAINLESS STEEL AL-6XN®
- STAINLESS STEEL 330
- STAINLESS STEEL 321
- 317L STAINLESS STEEL
- STAINLESS STEEL 310/310S
- Stainless Steel 304L
- Stainless Steel 304
- STAINLESS STEEL 253 MA
Carbon Steel
- CARBON STEEL PRODUCTS
Titanium
- 10V-2Fe-3Al
- 6Al-4V
- 6Al-4V STA
- 6Al-4V ELI
- 6Al-2Sn-4Zr-2Mo