Stainless Steel Elbow 45, 90, 180 Degree

Stainless steel elbow is a pipe fitting that connects two lengths of pipe or tubing to change the direction in piping and plumbing systems, there are common angles having 45 degree, 90 degree and 180 degree, stainless steel elbow can withstand high pressure and resist corrosion.

Elbow dimension ranges from 1/2 inch to 72 inch, Schedule in wall thickness range covers 5S, 10S, 40S, 80S, 160S, XXS conforming to ASME B16.9 and ASME B16.11.

ASME A403 stainless steel elbow
large size stainless steel elbow

Stainless Steel Elbow Fitting Specifications and Standards

ASME B16.9, Factory Made Wrought Butt welding Fittings

ASTM A403, Wrought Austenitic Stainless Steel Piping Fittings

ASTM A960, Common Requirements for Wrought Steel Piping Fittings

ASTM A815, Wrought Ferritic, Ferritic/Austenitic, and Martensitic Stainless Steel Piping Fittings

EN 10253-3, Wrought austenitic and austenitic-ferritic (duplex) stainless steels without specific inspection requirements

EN 10253-4, Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection requirements

Stainless Steel Material

There are various stainless steels to be adapted for pipe elbow used in different applications, as we know that stainless steel exhibits excellent properties to resist corrosion, heating and high pressure, thus, stainless steel elbow is often used in critical applications。

304 and 316L are the most used stainless steel grades, they are both high chromium austenitic grades, and can be met the most cases, and other grades are available, such as, 321/321H and 347/347H. Some special alloys are usually for elbow as well, like 904L, 2205.

GradeCarbonSiliconManganeseChromiumNickelMolybdenumSulfurPhosphorous
WP 3040,081,02.0018.0 – 20.08.0 – 11.00,030,045
WP 304L0,0351,02.0018.0 – 20.08.0 – 13.00,030,045
WP 3160,081,02.0016.0 – 18.010.0 – 14.02.00 – 3.000,030,045
WP 316L0,0351,02.0016.0 – 18.010.0 – 15.02.00 – 3.000,030,045
WP 3210,081,02.0017.0 – 19.09.0 – 12.00,030,045

There are also EN steel no. for opting, these equivalents include 1.4301, 1.4307, 1.4401, 1.4404, 1.4541, 1.4550, 1.4438 and 1.4539.

Elbow Length and Radius

Elbows are available in two radius types by length, Short radius (SR) and Long radius (LR), there are also other radiuses, for example, 2D, 3D and 4D.

Long Radius Elbow

Long radius elbow the radius of curvature is equal to 1.5 times the diameter of the pipe, namely, R = 1.5D, long radius elbow is used to reduce frictional force and elbow abrasion.

Short Radius Elbow

Short radius elbow the radius of curvature is equal to the pipe diameter, short radius elbow is typically installed in the limited situation and tight space, it will be giving the piping a sharper turn than a long radius elbow, However, it is a less cost option compared to LR elbow.

2D means bending radius is 2 times the nominal pipe size, in the same way, 3D means 2 times the nominal pipe size, they are long radius elbows as well, these long radius elbows not like 1.5D elbow frequently used, they are more smoother and used for specific applications.

Elbow Direction Angle

There are three common angles of elbow to use in piping system, 45 degree, 90 degree and 180 degree, these angle types are to turn fluid different into direction, including right angles and return angle,  there are also other angles to use, like 60 degree and 180 degree.

45 Degree Elbow

45 degree elbow changes the flow direction to 45 degrees, it includes long radius 45 degree elbow and short radius 45 degree elbow.

90 Degree Elbow

90 degree elbow changes the flow direction to 90 degrees, it also has long radius and short radius types, 90 degree elbow is the most used elbow。。

180 Degree Elbow

180 degree elbow changes the flow direction to 180 degrees.

Elbow Connection Style

According to connection style, elbow can be classified butt weld elbow, socket welded elbow and threaded elbow, butt weld elbow is commonly used type。

Butt Weld Elbow

Butt weld refers to connect pipes and fittings ends by butt welding method, it has ends in beveled to make it easy to weld, beveled ends should be conformed to requirement of ASME B16。25, plain end is offered upon request, BW elbow dimensions can be from 1/2” to 72”, BW weld elbow can be made of both seamless and welded pipe by the process of hot forming that includes bending and forming to shape。

Butt-weld fittings allow for a smooth, flush connection that provides maximum flow, is lower cost elbow, thin wall sizes can be allowed。

BW Elbow Dimensions

stainless steel elbow dimensions
NPSODCenter to End
Inch.mmABC
1/221.33816
3/426.72911
133.4382225
1 1/442.2482532
1 1/248.3572938
260.3763551
2 1/273954464
388.91145176
3 1/2101.61335789
4114.315264102
5141.319079127
6168.322995152
8219.1305127203
10273.1381159254
12323.9457190305
14355.6533222356
16406.4610254406
18457.2686286457
20508762318508
22559838343559
24610914381610
26660991406660
287111067438711
307621143470762
328131219502813
348641295533864
369141372565914
389651448600965
40101615246321016
42106716006601067
44111816766951118
46116817537271168
48121918297591219
All Dimensions to ASME B16.9, unit is in mm

BW Elbow Weight Chart

NPS
inches
ELBOWS
LR 90°
ELBOWS
SR 90°
Sch.
5S
Sch.
10S
Sch.
40S
Sch.
80S
Sch.
5S
Sch.
10S
Sch.
40S
Sch.
80S
1/20.050.060.080.100.030.040.050.07
3/40.060.070.090.110.040.050.060.07
10.090.150.180.200.060.100.120.13
1 1/40.130.200.250.350.090.130.170.12
1 1/20.180.300.400.500.120.200.270.33
20.300.500.700.900.200.330.470.60
2 1/20.600.851.351.800.400.600.901.20
30.901.302.002.900.600.901.351.90
41.402.004.005.900.901.352.653.90
52.903.606.509.701.952.404.356.50
64.005.0010.516.02.703.357.0010.5
87.4010.021.533.54.906.7014.522.5
1013.616.838.552.59.1011.225.635.0
1223.427.059.079.015.618.039.553.0
1429.035.070.094.019.323.547.063.0
1641.347.095.012527.531.563.584.0
1851.859.012015834.539.580.0105
2073.085.014619449.057.098.0129
2412214021028282.094.0140188
Approximate weights in kg, density 8 kg/dm3

Dimensional Tolerances of Butt Weld Elbows

45° and 90° – LR and 3D elbow conform to ASME B16。9。

Nominal Pipe Size1/2 to 2.1/23 to 3.1/245 to 8
Outside Diameter
at Bevel (D)
+ 1.6
– 0.8
1.61.6+ 2.4
– 1.6
Inside Diameter at End0.81.61.61.6
Center to End LR (A/B)2222
Center to End 3D (A/B)3333
Nominal Pipe Size10 to 1820 to 2426 to 3032 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 End3.24.8+ 6.4
– 4.8
+ 6.4
– 4.8
Center to End LR (A/B)2235
Center to End 3D (A/B)3366
Wall Thickness (t)Not less than 87.5% of Nominal Wall Thickness

澳门凯发娱乐Dimensional tolerances are in millimeters。

Socket Weld Elbow

Socket weld elbow has socket area at end of elbow, it can be inserted a pipe to connect together, the diameter of socket area is matching with the outer diameter of pipe。

Socket connect elbows are easier to weld than butt-weld elbows because the fitting doesn’t need to align perfectly to the pipe。 Slip the pipe into the socket and weld, no beveled ends needed。

SW elbows also have 90 degree and 45 degree elbows for selecting, generally, SW elbow is used for small pipe diameter, and have three pressure ratings: Class 3000, 6000 and 9000.

Threaded Elbow

Threaded elbow is similar to the SW elbow in shape, the difference is that threaded elbow has thread inside of elbow end, this type elbow is easier to install and remove, good for pipeline repair and maintenance.