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The Alloy Steel Reducing Flanges have the same flange face and bolt dimensions like those of a larger pipe while the bore and weld end are of a smaller size. They are used to connect the larger flange to the smaller pipe or nozzle in a single piece, therefore, there is no need of having an additional reducer. They can be made in weld neck, slip-on and threaded configurations in various alloys like F5, F9, F11, F22 and F91 as per the ASTM A182 specification. Solitaire Overseas supplies these flanges with EN 10204 3.1 certification and complete material traceability for domestic and international orders.
| Parameter | Detail |
|---|---|
|
Product |
Alloy steel reducing flange (reducing weld neck, reducing slip on, reducing threaded) |
|
Material Grades |
ASTM A182 F5, F9, F11 Cl.2/Cl.3, F22 Cl.3, F91 (F1 and F12 available on request) |
|
Standard |
ASME B16.5 within standard reducing flange limits; larger sizes per ASME B16.47 or custom drawing |
|
Size Marking |
Larger flange NPS by smaller bore NPS, for example 6 by 4 inch or 10 by 8 inch |
|
Pressure Class |
Class 150, 300, 600, 900, 1500, and 2500 (coverage determined by standard scope) |
|
Face Type |
Raised Face (RF), Ring Type Joint (RTJ) |
|
Heat Treatment |
Annealed, or normalised and tempered, per the ASTM A182 grade. Confirm whether quenched and tempered is allowed for each grade before stating it |
|
Testing |
Chemical composition, mechanical tensile/yield/impact, hardness, PMI, UT, and MPI |
|
Documentation |
EN 10204 3.1 Mill Test Certificate (MTC), EN 10204 3.2 TPI available on request |
| Grade | Carbon (C) | Manganese (Mn) | Phosphorus (P) max | Sulfur (S) max | Silicon (Si) | Chromium (Cr) | Molybdenum (Mo) | Other Elements |
|---|---|---|---|---|---|---|---|---|
|
A182 F5 |
0.15 max |
0.30 to 0.60 |
0.030 |
0.030 |
0.50 max |
4.00 to 6.00 |
0.44 to 0.65 |
Not specified |
|
A182 F9 |
0.15 max |
0.30 to 0.60 |
0.030 |
0.030 |
0.50 to 1.00 |
8.00 to 10.00 |
0.90 to 1.10 |
Not specified |
|
A182 F11 Cl.2 |
0.10 to 0.20 |
0.30 to 0.80 |
0.040 |
0.040 |
0.50 to 1.00 |
1.00 to 1.50 |
0.44 to 0.65 |
Not specified |
|
A182 F22 Cl.3 |
0.05 to 0.15 |
0.30 to 0.60 |
0.040 |
0.040 |
0.50 max |
2.00 to 2.50 |
0.87 to 1.13 |
Not specified |
|
A182 F91 |
0.08 to 0.12 |
0.30 to 0.60 |
0.020 |
0.010 |
0.20 to 0.50 |
8.00 to 9.50 |
0.85 to 1.05 |
V: 0.18 to 0.25, Nb: 0.06 to 0.10, N: 0.03 to 0.07 |
| Grade | Tensile Strength min, MPa (ksi) | Yield Strength min, MPa (ksi) | Elongation min, % | Reduction of Area min, % | Hardness, HBW |
|---|---|---|---|---|---|
|
A182 F5 |
485 (70) |
275 (40) |
20 |
35 |
217 max |
|
A182 F9 |
585 (85) |
380 (55) |
20 |
40 |
179 to 217 |
|
A182 F11 Cl.2 |
485 (70) |
275 (40) |
20 |
30 |
143 to 207 |
|
A182 F11 Cl.3 |
515 (75) |
310 (45) |
20 |
30 |
156 to 207 |
|
A182 F22 Cl.3 |
515 (75) |
310 (45) |
20 |
30 |
156 to 207 |
|
A182 F91 |
585 (85) |
415 (60) |
20 |
40 |
190 to 248 |
| Run Size by Reduced Bore (NPS) | Flange Outside Dia (OD) | Flange Thickness (T) | Bolt Circle Dia (PCD) | Number of Bolts | Bolt Hole Dia |
|---|---|---|---|---|---|
|
1" by 1/2" or 3/4" |
108 |
14.3 |
79.4 |
4 |
15.9 |
|
1-1/2" by 3/4" or 1" |
127 |
17.5 |
98.4 |
4 |
15.9 |
|
2" by 1" or 1-1/2" |
152 |
19.1 |
120.7 |
4 |
19.0 |
|
2-1/2" by 1-1/2" or 2" |
178 |
22.4 |
139.7 |
4 |
19.0 |
|
3" by 1-1/2" or 2" |
191 |
23.9 |
152.4 |
4 |
19.0 |
|
4" by 2" or 3" |
229 |
23.9 |
190.5 |
8 |
19.0 |
|
6" by 3" or 4" |
279 |
25.4 |
241.3 |
8 |
22.2 |
|
8" by 4" or 6" |
343 |
28.6 |
298.5 |
8 |
22.2 |
|
10" by 6" or 8" |
406 |
30.2 |
362.0 |
12 |
25.4 |
|
12" by 8" or 10" |
483 |
31.8 |
431.8 |
12 |
25.4 |
| Run Size by Reduced Bore (NPS) | Class 150 (kg) | Class 300 (kg) |
|---|---|---|
|
1" by 1/2" |
0.9 |
1.3 |
|
1-1/2" by 1" |
1.5 |
2.5 |
|
2" by 1" |
2.4 |
3.6 |
|
2" by 1-1/2" |
2.2 |
3.4 |
|
3" by 1-1/2" |
4.5 |
7.0 |
|
3" by 2" |
4.1 |
6.5 |
|
4" by 2" |
6.8 |
12.0 |
|
4" by 3" |
6.1 |
11.2 |
|
6" by 3" |
11.5 |
21.0 |
|
6" by 4" |
10.5 |
19.5 |
|
8" by 4" |
20.0 |
36.0 |
|
8" by 6" |
18.0 |
33.0 |
|
10" by 6" |
24.5 |
56.0 |
|
10" by 8" |
23.5 |
51.0 |
|
12" by 8" |
37.0 |
82.0 |
|
12" by 10" |
35.5 |
75.0 |
Alloy steel reducing flanges are forged pipe fittings designed to connect a larger flange size to a smaller pipe bore.
Their main purpose is to connect different pipe sizes while maintaining a secure flanged connection.
It matches the bolt pattern of a larger flange and gives a smaller bore, so the smaller pipe welds or threads in.
Use it for a short step down at a valve or nozzle where space is tight. Use a reducer and flange for flow sensitive lines.
Write the larger flange size first and the smaller bore second, for example 6 by 4 inch, with the class, face and pipe schedule.
A reducing flange has a smaller bore than its face size. An expander flange has a bore that widens to a larger pipe.
Contact Solitaire Overseas for expert guidance and the right alloy steel reducing flange for your project, or send your enquiry here.