Superalloys are commonly referred to as high performance alloys. Many nickel based alloys such as Inconel 625 are superalloys, for they exhibit properties that excel even in the most corrosive environments. Particularly suited to elevated temperature settings, the Inconel 625 Ring Type Joint Flange is resistant to accelerated rates of oxidation, unlike conventional stainless steel, which undergoes rapid decay.

Inconel 625 Flanges

Nickel Alloy 625 SORF Flanges

UNS N06625 Blind Flange
Inconel 625 is also resistant to creep deformation because of its high mechanical strength and its ability to withstand elevated temperatures. A high mechanical strength would mean that the capacity of the Nickel Alloy 625 Blind Flange to withstand pressure is high, especially since these components are a part of boiler furnaces, exhaust systems, and the aerospace industry. Despite its high mechanical strength and ability to sustain itself at elevated temperatures, the most important feature of the UNS N06625 Slip On Flange is its resistance to corrosion.
While chromium in the alloy is responsible for the oxidation resistance of the flange, the primary alloyant that is nickel aids in the resistance to reductive solutions. Aside from its corrosion resistance properties, often manufacturers recommend the UNS N06625 SORF flange to be used as a part of those operations that may result in fatigue. As Inconel 625 has great fatigue resistance properties, its high melting point also yields a high tensile.
Table of Content
| Temp. | Working Pressures by Classes | |
| Class 150 | Class 300 | |
| -29 to 38 | 20.0 | 51.7 |
| 50 | 19.5 | 51.7 |
| 100 | 17.7 | 51.5 |
| 150 | 15.8 | 50.3 |
| 200 | 13.8 | 48.3 |
| 250 | 12.1 | 46.3 |
| 300 | 10.2 | 42.9 |
| 325 | 9.3 | 41.4 |
| 350 | 8.4 | 40.3 |
| 375 | 7.4 | 38.9 |
| 400 | 6.5 | 36.5 |
| 425 | 5.5 | 35.2 |
| 450 | 4.6 | 33.7 |
| 475 | 3.7 | 31.7 |
| 500 | 2.8 | 28.2 |
| 538 | 1.4 | 25.2 |
| 550 | . . . | 25.0 |
| 575 | . . . | 24.0 |
| 600 | . . . | 21.6 |
| 625 | . . . | 18.3 |
| 650 | . . . | 14.1 |
| 675 | . . . | 11.5 |
| 700 | . . . | 8.8 |
| Nominal Size | Outside Diameter (OD) | Min. Thickness (T) | RF Dia. (R) | No. of Bolt Holes | Diameter of Holes | Bolt Circle (BC) | SO Bore ID (SB) | Dia. Hub Base (HB) | Dia. Hub Top (HT) | SO LTH (SL) | WN LTH (WL) | * WN Bore ID (WB) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1⁄2 | 3.75 | 0.56 | 1.38 | 4 | 0.63 | 2.62 | 0.88 | 1.5 | 0.84 | 0.88 | 2.06 | * |
| 3⁄4 | 4.62 | 0.62 | 1.69 | 4 | 0.75 | 3.25 | 1.09 | 1.88 | 1.05 | 1.00 | 2.25 | * |
| 1 | 4.88 | 0.69 | 2.00 | 4 | 0.75 | 3.50 | 1.36 | 2.12 | 1.32 | 1.06 | 2.44 | * |
| 11⁄4 | 5.25 | 0.81 | 2.50 | 4 | 0.75 | 3.88 | 1.70 | 2.50 | 1.66 | 1.12 | 2.62 | * |
| 11⁄2 | 6.12 | 0.88 | 2.88 | 4 | 0.88 | 4.50 | 1.95 | 2.75 | 1.90 | 1.25 | 2.75 | * |
| 2 | 6.50 | 1.00 | 3.62 | 8 | 0.75 | 5.00 | 2.44 | 3.31 | 2.38 | 1.44 | 2.88 | * |
| 21⁄2 | 7.50 | 1.12 | 4.12 | 8 | 0.88 | 5.88 | 2.94 | 3.94 | 2.88 | 1.62 | 3.12 | * |
| 3 | 8.25 | 1.25 | 5.00 | 8 | 0.88 | 6.62 | 3.57 | 4.62 | 3.50 | 1.81 | 3.25 | * |
| 31⁄2 | 9.00 | 1.38 | 5.50 | 8 | 1.00 | 7.25 | 4.07 | 5.25 | 4.00 | 1.94 | 3.38 | * |
| 4 | 10.00 | 1.38 | 6.19 | 8 | 1.00 | 7.88 | 4.57 | 5.75 | 4.50 | 2.00 | 3.50 | * |
| 5 | 11.00 | 1.50 | 7.31 | 8 | 1.00 | 9.25 | 5.66 | 7.00 | 5.56 | 2.12 | 4.00 | * |
| 6 | 12.50 | 1.62 | 8.50 | 12 | 1.00 | 10.62 | 6.72 | 8.12 | 6.63 | 2.25 | 4.06 | * |
| 8 | 15.00 | 1.88 | 10.62 | 12 | 1.12 | 13.00 | 8.72 | 10.25 | 8.63 | 2.69 | 4.62 | * |
| 10 | 17.50 | 2.12 | 12.75 | 16 | 1.25 | 15.25 | 10.88 | 12.62 | 10.75 | 2.88 | 4.88 | * |
| 12 | 20.50 | 2.25 | 15.00 | 16 | 1.38 | 17.75 | 12.88 | 14.75 | 12.75 | 3.12 | 5.38 | * |
| 14 | 23.00 | 2.38 | 16.25 | 20 | 1.38 | 20.25 | 14.14 | 16.75 | 14.00 | 3.31 | 5.88 | * |
| 16 | 25.50 | 2.50 | 18.50 | 20 | 1.50 | 22.50 | 16.16 | 19.00 | 16.00 | 3.69 | 6.00 | * |
| 18 | 28.00 | 2.62 | 21.00 | 24 | 1.50 | 24.75 | 18.18 | 21.00 | 18.00 | 3.88 | 6.50 | * |
| 20 | 30.50 | 2.75 | 23.12 | 24 | 1.62 | 27.00 | 20.20 | 23.12 | 20.00 | 4.00 | 6.62 | * |
| 22 | 33.00 | 2.88 | 25.25 | 24 | 1.75 | 29.25 | 22.22 | 25.25 | 22.00 | 4.25 | 6.75 | * |
| 24 | 36.00 | 3.00 | 27.25 | 24 | 1.88 | 32.00 | 24.25 | 27.62 | 24.00 | 4.50 | 6.88 | * |
| Size Ranges | From 1/2 inch (i.e. 15 NB) upto 48 inch (i.e. 1200NB) |
|---|---|
| Specification | ASTM B564/ ASME SB564 |
| Grade | 625 |
| Standards | ASME | BS | DIN | ANSI | GOST | EN Flange |
| JIS Standards | 5 K, 10K, 16K, 20 K, 30K, 40K, 63 K |
| Flange Face Type | FF, RF, LMF, SMF, RTJ, LJF. |
| UNI/ DIN / EN Standard | 6Bar, 10 Bar, 16Bar, 25 Bar, 40Bar |
| Pressure Classes | Class 150, Cl 300, 400, Cl. 600, Cl 900, Class 1500 and 2500 |
| Product | Price |
| Inconel 625 UNS NO6625 Stainless Steel Flange RF LJW Lap Joint Flange 12" class 900 ANSI B16.5 | $1.00 - $13.28/ Piece |
| Inconel 625 Flange Class 600# Slip On Flange | $3.68 - $2.60/ Piece |
| Nickel Alloy Threaded Flange UNS N06625 | $3.46 - $2.90/ Piece |
| Flange 625 ASTM B564 UNS N06625 1" Class150 RF | $112.75/ Piece |
| Element | (%) |
| Ni | 58.0 min |
| Si | 0.50 max |
| Al | 0.40 max |
| Fe | 5.0 max |
| Cr | 20.0-23.0 |
| C | 0.10 max |
| Mo | 8.0-10.0 |
| Co | 1.0 max |
| Mn | 0.50 max |
| Ti | 0.40 max |
| P | 0.015 max |
| Nb + Ta | 3.15-4.15 |
| S | 0.015 max |
| Standard | Class | Diameter of Bolt Circle | Dia. | Bolt Size | No. of Bolts | Bolt Hole Diameter |
|---|---|---|---|---|---|---|
| AS4087 | PN14 | 67 | 95 | M12 | 4 | 14 |
| ANSI B16.5 | ANSI 150 | 60 | 89 | 13 | 4 | 16 |
| ANSI 300 | 67 | 95 | 13 | 4 | 16 | |
| ANSI 600 | 67 | 95 | 13 | 4 | 16 | |
| ANSI 900 | 83 | 121 | 19 | 4 | 22 | |
| ANSI 1500 | 83 | 121 | 19 | 4 | 22 | |
| AS 2129 Flange | Table C | 67 | 95 | 13 | 4 | 14 |
| Table D | 67 | 95 | 13 | 4 | 14 | |
| Table E | 67 | 95 | 13 | 4 | 14 | |
| Table F | 67 | 95 | 13 | 4 | 14 | |
| Table H | 83 | 114 | 16 | 4 | 17 | |
| Table J | 83 | 114 | 16 | 4 | 17 | |
| ISO 7005 (DIN) Flange | PN6 | 55 | 80 | M10 | 4 | 11 |
| PN10 | 65 | 95 | M12 | 4 | 14 | |
| PN16 | 65 | 95 | M12 | 4 | 14 | |
| PN20 | 60.5 | 90 | M14 | 4 | 16 | |
| PN25 | 65 | 95 | M12 | 4 | 14 | |
| PN40 | 65 | 95 | M12 | 4 | 14 |
| UNS | WERKSTOFF NR. | BS | JIS | AFNOR | GOST | EN |
| N06625 | 2.4856 | NA 21 | NCF 625 | NC22DNB4MNiCr22Mo9Nb | ХН75МБТЮ | NiCr23Fe |
| Melting Point | Density | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| 1350 °C (2460 °F) | Psi – 1,35,000 , MPa – 930 | 8.4 g/cm3 | Psi – 75,000 , MPa – 517 | 42.5 % |

