Inconel 718 Flanges
Inconel 718 Flanges are made from UNS N07718, a precipitation-hardenable nickel-chromium alloy with significant additions of niobium, molybdenum, and iron. Age hardening gives Alloy 718 exceptional tensile strength above 1200 MPa, combined with good oxidation and corrosion resistance up to 700°C. These flanges are used in aerospace, oil and gas, power generation, and high-pressure chemical service, where both high mechanical load and elevated temperature performance are required simultaneously. Alloy 718 is one of the most widely used superalloys in demanding bolted flange applications.
Price of Inconel 718 Flanges
The approximate price range of Inconel 718 flanges per kg and per unit, including the factors influencing their rates, is explained below.
Approx Price Range
The approximate price range of ASTM B564 UNS N07718 flanges is ₹4,375 – ₹5,000 per kg, based on current market conditions.
Price Per Unit
The price range for Inconel 718 flanges is Rs 320 to Rs 6500 per piece, depending on size, type (weld neck, blind), thickness, supplier, and quantity. Per-piece pricing is common for custom sizes or age-hardened supplies.
Factors Affecting Price
Nickel and niobium market rates, flange type, NPS size, pressure class, age-hardening treatment, certification requirements, and order volume all affect the final cost of UNS N07718 flanges.
Types of UNS N07718 Flanges
Inconel 718 flanges are available in a full range of types to suit different piping configurations, pressure ratings, and high-temperature service conditions.
- Weld Neck Flanges (WNRF)
- Slip-On Flanges (SORF)
- Blind Flanges (BLRF)
- Socket Weld Flanges (SWRF)
- Threaded Flanges
- Lap Joint Flanges
- Orifice Flanges
- Reducing Flanges
- Long Weld Neck Flanges
- Spectacle Blind Flanges
- Ring Type Joint Flanges (RTJ)
- Flat Face Flanges (FF)
Alloy 718 Flanges Specifications
The table below covers the key specification parameters for Inconel 718 flanges as per international standards.
|
Parameter |
Details |
|
Standard |
ASTM B564 / ASME SB564 |
|
Pressure Classes |
150#, 300#, 400#, 600#, 900#, 1500#, 2500# / PN6 to PN250 |
|
Size Range |
NPS 1/2" to 24" / DN15 to DN600 (larger per B16.47) |
|
Facing |
Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF), Tongue & Groove |
|
Condition |
Solution annealed, or age hardened |
|
Manufacture |
Forged, Hot rolled, CNC machined |
|
Finish |
Plain, Pickled & Passivated, Electro-polished |
Chemical Composition of ASTM B564 Inconel 718 Flanges
The composition below shows the niobium and molybdenum additions that, combined with nickel and chromium, give Alloy 718 its high-temperature strength and precipitation-hardening capability.
|
Element |
Composition (%) |
|
Nickel (Ni) + Cobalt |
50.0 – 55.0 |
|
Chromium (Cr) |
17.0 – 21.0 |
|
Iron (Fe) |
Balance |
|
Niobium (Nb) + Tantalum (Ta) |
4.75 – 5.50 |
|
Molybdenum (Mo) |
2.8 – 3.3 |
|
Titanium (Ti) |
0.65 – 1.15 |
|
Aluminium (Al) |
0.20 – 0.80 |
|
Carbon (C) |
0.08 max |
|
Manganese (Mn) |
0.35 max |
|
Silicon (Si) |
0.35 max |
|
Sulphur (S) |
0.015 max |
|
Cobalt (Co) |
1.0 max |
|
Copper (Cu) |
0.30 max |
Mechanical Properties of DIN 2.4668 Flanges
The mechanical values below apply to age-hardened ASTM B564 UNS N07718 forged flange material. Solution-annealed values are lower; confirm the condition with your supplier.
|
Property |
Value |
|
Tensile Strength |
1241 MPa (180,000 psi) min (age hardened) |
|
Yield Strength (0.2% offset) |
1034 MPa (150,000 psi) min (age hardened) |
|
Elongation |
12% min |
|
Hardness |
Max 36 HRC (age hardened) |
Physical Properties of Inconel 718 Flanges
The physical properties below help engineers assess thermal behaviour and suitability for elevated-temperature or cryogenic service conditions.
|
Property |
Value |
|
Density |
8.19 g/cm³ |
|
Melting Range |
1260 – 1336°C (2300 – 2437°F) |
|
Specific Heat |
435 J/kg·°C |
|
Thermal Conductivity |
11.4 W/m·K (at 100°C) |
|
Electrical Resistivity |
1.25 µΩ·m |
|
Modulus of Elasticity |
200 GPa |
|
Coefficient of Thermal Expansion |
13.0 µm/m°C (20–100°C) |
Dimension Chart of Alloy 718 Flanges per ASME B16.5
The table below lists standard flange dimensions for Inconel 718 per ASME B16.5 Class 150.
|
NPS (in) |
DN (mm) |
OD (mm) |
Bore (mm) |
PCD (mm) |
Thickness (mm) |
Bolt Holes |
|
1/2 |
15 |
88.9 |
34.9 |
60.3 |
35.1 |
4 x 1/2" |
|
3/4 |
20 |
98.6 |
42.9 |
69.9 |
38.1 |
4 x 1/2" |
|
1 |
25 |
108.0 |
50.8 |
79.4 |
42.9 |
4 x 1/2" |
|
1.1/2 |
40 |
127.0 |
73.0 |
98.4 |
52.3 |
4 x 1/2" |
|
2 |
50 |
152.4 |
92.1 |
120.7 |
58.7 |
4 x 5/8" |
|
3 |
80 |
190.5 |
127.0 |
152.4 |
68.3 |
4 x 5/8" |
|
4 |
100 |
228.6 |
157.2 |
190.5 |
73.0 |
8 x 5/8" |
|
6 |
150 |
279.4 |
215.9 |
241.3 |
82.6 |
8 x 3/4" |
|
8 |
200 |
342.9 |
269.9 |
298.5 |
95.3 |
8 x 3/4" |
|
10 |
250 |
406.4 |
323.8 |
362.0 |
101.6 |
12 x 7/8" |
|
12 |
300 |
482.6 |
381.0 |
431.8 |
114.3 |
12 x 7/8" |
|
14 |
350 |
533.4 |
412.8 |
476.3 |
123.8 |
12 x 1" |
|
16 |
400 |
596.9 |
469.9 |
539.8 |
130.2 |
16 x 1" |
|
18 |
450 |
635.0 |
533.4 |
577.9 |
139.7 |
16 x 1.1/8" |
|
20 |
500 |
698.5 |
584.2 |
635.0 |
149.2 |
20 x 1.1/8" |
|
24 |
600 |
812.8 |
692.2 |
749.3 |
165.1 |
20 x 1.1/4" |
Size Chart of UNS N07718 Flanges
Inconel 718 flanges are available across a wide size range under both ASME and international standards to cover high-pressure and high-temperature piping systems.
|
Standard |
Size Range (NPS) |
Size Range (DN) |
Pressure Classes |
|
ASME B16.5 |
1/2" – 24" |
DN15 – DN600 |
150# to 2500# |
|
ASME B16.47 Series A |
26" – 60" |
DN650 – DN1500 |
150# to 900# |
|
DIN / EN 1092-1 |
DN15 – DN1200 |
DN15 – DN1200 |
PN6 to PN250 |
|
BS 4504 |
1/2" – 48" |
DN15 – DN1200 |
PN6 to PN64 |
|
JIS B2220 |
10A – 1500A |
DN10 – DN1500 |
5K to 63K |
Pressure Rating Chart of ASTM B564 Alloy 718 Flanges
The pressure-temperature ratings below apply to Inconel 718 flanges per ASME B16.5 Group 3.4 (nickel alloys). Values are the maximum allowable working pressures in bar at the listed temperature.
|
Temp (°C) |
Class 150 (bar) |
Class 300 (bar) |
Class 600 (bar) |
Class 900 (bar) |
Class 1500 (bar) |
Class 2500 (bar) |
|
-29 to 38 |
20.0 |
52.1 |
104.2 |
156.2 |
260.4 |
434.0 |
|
50 |
19.6 |
51.1 |
102.1 |
153.2 |
255.3 |
425.5 |
|
100 |
17.7 |
46.6 |
93.2 |
139.8 |
233.0 |
388.3 |
|
200 |
16.2 |
42.9 |
85.7 |
128.6 |
214.3 |
357.1 |
|
300 |
15.8 |
41.5 |
83.1 |
124.6 |
207.7 |
346.1 |
|
400 |
15.3 |
40.0 |
80.1 |
120.1 |
200.2 |
333.7 |
|
500 |
14.8 |
38.6 |
77.3 |
115.9 |
193.2 |
322.0 |
|
600 |
12.4 |
32.7 |
65.4 |
98.1 |
163.5 |
272.5 |
|
650 |
9.6 |
25.4 |
50.8 |
76.1 |
126.9 |
211.5 |
|
700 |
6.2 |
16.4 |
32.9 |
49.3 |
82.2 |
136.9 |
Key Features of Inconel 718 Flanges
Alloy 718 flanges deliver a combination of ultra-high strength and elevated temperature performance that few other nickel alloys can match in the same size range.
- Age-hardened tensile strength above 1200 MPa, enabling high preload in critical flanged joints
- Excellent oxidation and hot corrosion resistance up to 700°C
- Good resistance to stress corrosion cracking in high-pressure, high-temperature environments
- Precipitation hardening with niobium and titanium gives stable mechanical properties over a long service life
- Excellent cryogenic toughness, retaining strength and ductility at sub-zero temperatures
- Good weldability in the annealed condition; age hardening is applied after fabrication
- Suitable for hydrogen service environments where other high-strength alloys are susceptible to embrittlement
- Available in all standard flange types per ASME B16.5 and B16.47
Applications of ASTM B564 Alloy 718 Flanges
The high strength and temperature capability of Inconel 718 make these flanges a dependable choice across industries with the most demanding service conditions.
- Aerospace and Gas Turbine Components
- Oil and Gas Wellheads and Blowout Preventers
- High-Pressure Chemical Reactors
- Power Generation Turbine Housings
- Cryogenic and LNG Systems
- Nuclear Reactor Components
- Offshore and Subsea Equipment
- Defence and Military Applications
How to Choose the Right Inconel 718 Flanges Supplier?
Consider the following things when choosing the right Inconel 718 flange supplier.
Supplier Selection Criteria
The first check is the availability of the stock in the exact sizes, pressure classes, and material conditions you require. Alloy 718 is typically delivered in the annealed or age-hardened condition, which has significantly different mechanical properties. Please check which condition you need for your application before ordering. It is better to source from suppliers who specialise in superalloys, rather than general flange distributors who might not stock or properly certify 718 material.
Technical Considerations
Request material test certificates confirming chemical composition and mechanical properties per ASTM B564. For age-hardened supply, verify that tensile, yield, and hardness values are within the requirements for precipitation-hardened condition. In addition to the ASTM, there may also be other specification requirements for aerospace and defence applications, such as AMS 5664 or API 6A. Before manufacture, check flange dimensions against the pressure class tables in ASME B16.5 for your NPS and confirm the type of facing.
Quality and Certification Check
EN 10204 / 3.1 mill test certificates with heat number traceability are the minimum requirement. For aerospace or defence projects, request full material certification to AMS 5664 or equivalent. PMI reports on finished flanges confirm material identity. The minimum requirement is ISO 9001 certification. Confirm PED compliance for nuclear or oil and gas applications and project-specific documentation requirements. Hydrogen embrittlement test records may be required for sour service.
Procurement Tips for Bulk Orders
Alloy 718 prices track nickel and niobium markets. Lock in rates at order placement on long-duration projects. Age-hardened material requires additional heat treatment steps, so lead times are longer than for annealed supply. Ask for samples and mechanical test reports before going into full-scale production. Please confirm delivery times in writing. Add time for NDT and documentation to exceed normal forging lead times for high-criticality applications.
Inconel 718 Flanges are made from UNS N07718, a precipitation-hardenable nickel-chromium alloy with significant additions of niobium, molybdenum, and iron. Age hardening gives Alloy 718 exceptional tensile strength above 1200 MPa, combined with good oxidation and corrosion resistance up to 700°C. These flanges are used in aerospace, oil and gas, power generation, and high-pressure chemical service, where both high mechanical load and elevated temperature performance are required simultaneously. Alloy 718 is one of the most widely used superalloys in demanding bolted flange applications.
Price of Inconel 718 Flanges
The approximate price range of Inconel 718 flanges per kg and per unit, including the factors influencing their rates, is explained below.
Approx Price Range
The approximate price range of ASTM B564 UNS N07718 flanges is ₹4,375 – ₹5,000 per kg, based on current market conditions.
Price Per Unit
The price range for Inconel 718 flanges is Rs 320 to Rs 6500 per piece, depending on size, type (weld neck, blind), thickness, supplier, and quantity. Per-piece pricing is common for custom sizes or age-hardened supplies.
Factors Affecting Price
Nickel and niobium market rates, flange type, NPS size, pressure class, age-hardening treatment, certification requirements, and order volume all affect the final cost of UNS N07718 flanges.
Types of UNS N07718 Flanges
Inconel 718 flanges are available in a full range of types to suit different piping configurations, pressure ratings, and high-temperature service conditions.
- Weld Neck Flanges (WNRF)
- Slip-On Flanges (SORF)
- Blind Flanges (BLRF)
- Socket Weld Flanges (SWRF)
- Threaded Flanges
- Lap Joint Flanges
- Orifice Flanges
- Reducing Flanges
- Long Weld Neck Flanges
- Spectacle Blind Flanges
- Ring Type Joint Flanges (RTJ)
- Flat Face Flanges (FF)
Alloy 718 Flanges Specifications
The table below covers the key specification parameters for Inconel 718 flanges as per international standards.
|
Parameter |
Details |
|
Standard |
ASTM B564 / ASME SB564 |
|
Pressure Classes |
150#, 300#, 400#, 600#, 900#, 1500#, 2500# / PN6 to PN250 |
|
Size Range |
NPS 1/2" to 24" / DN15 to DN600 (larger per B16.47) |
|
Facing |
Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF), Tongue & Groove |
|
Condition |
Solution annealed, or age hardened |
|
Manufacture |
Forged, Hot rolled, CNC machined |
|
Finish |
Plain, Pickled & Passivated, Electro-polished |
Chemical Composition of ASTM B564 Inconel 718 Flanges
The composition below shows the niobium and molybdenum additions that, combined with nickel and chromium, give Alloy 718 its high-temperature strength and precipitation-hardening capability.
|
Element |
Composition (%) |
|
Nickel (Ni) + Cobalt |
50.0 – 55.0 |
|
Chromium (Cr) |
17.0 – 21.0 |
|
Iron (Fe) |
Balance |
|
Niobium (Nb) + Tantalum (Ta) |
4.75 – 5.50 |
|
Molybdenum (Mo) |
2.8 – 3.3 |
|
Titanium (Ti) |
0.65 – 1.15 |
|
Aluminium (Al) |
0.20 – 0.80 |
|
Carbon (C) |
0.08 max |
|
Manganese (Mn) |
0.35 max |
|
Silicon (Si) |
0.35 max |
|
Sulphur (S) |
0.015 max |
|
Cobalt (Co) |
1.0 max |
|
Copper (Cu) |
0.30 max |
Mechanical Properties of DIN 2.4668 Flanges
The mechanical values below apply to age-hardened ASTM B564 UNS N07718 forged flange material. Solution-annealed values are lower; confirm the condition with your supplier.
|
Property |
Value |
|
Tensile Strength |
1241 MPa (180,000 psi) min (age hardened) |
|
Yield Strength (0.2% offset) |
1034 MPa (150,000 psi) min (age hardened) |
|
Elongation |
12% min |
|
Hardness |
Max 36 HRC (age hardened) |
Physical Properties of Inconel 718 Flanges
The physical properties below help engineers assess thermal behaviour and suitability for elevated-temperature or cryogenic service conditions.
|
Property |
Value |
|
Density |
8.19 g/cm³ |
|
Melting Range |
1260 – 1336°C (2300 – 2437°F) |
|
Specific Heat |
435 J/kg·°C |
|
Thermal Conductivity |
11.4 W/m·K (at 100°C) |
|
Electrical Resistivity |
1.25 µΩ·m |
|
Modulus of Elasticity |
200 GPa |
|
Coefficient of Thermal Expansion |
13.0 µm/m°C (20–100°C) |
Dimension Chart of Alloy 718 Flanges per ASME B16.5
The table below lists standard flange dimensions for Inconel 718 per ASME B16.5 Class 150.
|
NPS (in) |
DN (mm) |
OD (mm) |
Bore (mm) |
PCD (mm) |
Thickness (mm) |
Bolt Holes |
|
1/2 |
15 |
88.9 |
34.9 |
60.3 |
35.1 |
4 x 1/2" |
|
3/4 |
20 |
98.6 |
42.9 |
69.9 |
38.1 |
4 x 1/2" |
|
1 |
25 |
108.0 |
50.8 |
79.4 |
42.9 |
4 x 1/2" |
|
1.1/2 |
40 |
127.0 |
73.0 |
98.4 |
52.3 |
4 x 1/2" |
|
2 |
50 |
152.4 |
92.1 |
120.7 |
58.7 |
4 x 5/8" |
|
3 |
80 |
190.5 |
127.0 |
152.4 |
68.3 |
4 x 5/8" |
|
4 |
100 |
228.6 |
157.2 |
190.5 |
73.0 |
8 x 5/8" |
|
6 |
150 |
279.4 |
215.9 |
241.3 |
82.6 |
8 x 3/4" |
|
8 |
200 |
342.9 |
269.9 |
298.5 |
95.3 |
8 x 3/4" |
|
10 |
250 |
406.4 |
323.8 |
362.0 |
101.6 |
12 x 7/8" |
|
12 |
300 |
482.6 |
381.0 |
431.8 |
114.3 |
12 x 7/8" |
|
14 |
350 |
533.4 |
412.8 |
476.3 |
123.8 |
12 x 1" |
|
16 |
400 |
596.9 |
469.9 |
539.8 |
130.2 |
16 x 1" |
|
18 |
450 |
635.0 |
533.4 |
577.9 |
139.7 |
16 x 1.1/8" |
|
20 |
500 |
698.5 |
584.2 |
635.0 |
149.2 |
20 x 1.1/8" |
|
24 |
600 |
812.8 |
692.2 |
749.3 |
165.1 |
20 x 1.1/4" |
Size Chart of UNS N07718 Flanges
Inconel 718 flanges are available across a wide size range under both ASME and international standards to cover high-pressure and high-temperature piping systems.
|
Standard |
Size Range (NPS) |
Size Range (DN) |
Pressure Classes |
|
ASME B16.5 |
1/2" – 24" |
DN15 – DN600 |
150# to 2500# |
|
ASME B16.47 Series A |
26" – 60" |
DN650 – DN1500 |
150# to 900# |
|
DIN / EN 1092-1 |
DN15 – DN1200 |
DN15 – DN1200 |
PN6 to PN250 |
|
BS 4504 |
1/2" – 48" |
DN15 – DN1200 |
PN6 to PN64 |
|
JIS B2220 |
10A – 1500A |
DN10 – DN1500 |
5K to 63K |
Pressure Rating Chart of ASTM B564 Alloy 718 Flanges
The pressure-temperature ratings below apply to Inconel 718 flanges per ASME B16.5 Group 3.4 (nickel alloys). Values are the maximum allowable working pressures in bar at the listed temperature.
|
Temp (°C) |
Class 150 (bar) |
Class 300 (bar) |
Class 600 (bar) |
Class 900 (bar) |
Class 1500 (bar) |
Class 2500 (bar) |
|
-29 to 38 |
20.0 |
52.1 |
104.2 |
156.2 |
260.4 |
434.0 |
|
50 |
19.6 |
51.1 |
102.1 |
153.2 |
255.3 |
425.5 |
|
100 |
17.7 |
46.6 |
93.2 |
139.8 |
233.0 |
388.3 |
|
200 |
16.2 |
42.9 |
85.7 |
128.6 |
214.3 |
357.1 |
|
300 |
15.8 |
41.5 |
83.1 |
124.6 |
207.7 |
346.1 |
|
400 |
15.3 |
40.0 |
80.1 |
120.1 |
200.2 |
333.7 |
|
500 |
14.8 |
38.6 |
77.3 |
115.9 |
193.2 |
322.0 |
|
600 |
12.4 |
32.7 |
65.4 |
98.1 |
163.5 |
272.5 |
|
650 |
9.6 |
25.4 |
50.8 |
76.1 |
126.9 |
211.5 |
|
700 |
6.2 |
16.4 |
32.9 |
49.3 |
82.2 |
136.9 |
Key Features of Inconel 718 Flanges
Alloy 718 flanges deliver a combination of ultra-high strength and elevated temperature performance that few other nickel alloys can match in the same size range.
- Age-hardened tensile strength above 1200 MPa, enabling high preload in critical flanged joints
- Excellent oxidation and hot corrosion resistance up to 700°C
- Good resistance to stress corrosion cracking in high-pressure, high-temperature environments
- Precipitation hardening with niobium and titanium gives stable mechanical properties over a long service life
- Excellent cryogenic toughness, retaining strength and ductility at sub-zero temperatures
- Good weldability in the annealed condition; age hardening is applied after fabrication
- Suitable for hydrogen service environments where other high-strength alloys are susceptible to embrittlement
- Available in all standard flange types per ASME B16.5 and B16.47
Applications of ASTM B564 Alloy 718 Flanges
The high strength and temperature capability of Inconel 718 make these flanges a dependable choice across industries with the most demanding service conditions.
- Aerospace and Gas Turbine Components
- Oil and Gas Wellheads and Blowout Preventers
- High-Pressure Chemical Reactors
- Power Generation Turbine Housings
- Cryogenic and LNG Systems
- Nuclear Reactor Components
- Offshore and Subsea Equipment
- Defence and Military Applications
How to Choose the Right Inconel 718 Flanges Supplier?
Consider the following things when choosing the right Inconel 718 flange supplier.
Supplier Selection Criteria
The first check is the availability of the stock in the exact sizes, pressure classes, and material conditions you require. Alloy 718 is typically delivered in the annealed or age-hardened condition, which has significantly different mechanical properties. Please check which condition you need for your application before ordering. It is better to source from suppliers who specialise in superalloys, rather than general flange distributors who might not stock or properly certify 718 material.
Technical Considerations
Request material test certificates confirming chemical composition and mechanical properties per ASTM B564. For age-hardened supply, verify that tensile, yield, and hardness values are within the requirements for precipitation-hardened condition. In addition to the ASTM, there may also be other specification requirements for aerospace and defence applications, such as AMS 5664 or API 6A. Before manufacture, check flange dimensions against the pressure class tables in ASME B16.5 for your NPS and confirm the type of facing.
Quality and Certification Check
EN 10204 / 3.1 mill test certificates with heat number traceability are the minimum requirement. For aerospace or defence projects, request full material certification to AMS 5664 or equivalent. PMI reports on finished flanges confirm material identity. The minimum requirement is ISO 9001 certification. Confirm PED compliance for nuclear or oil and gas applications and project-specific documentation requirements. Hydrogen embrittlement test records may be required for sour service.
Procurement Tips for Bulk Orders
Alloy 718 prices track nickel and niobium markets. Lock in rates at order placement on long-duration projects. Age-hardened material requires additional heat treatment steps, so lead times are longer than for annealed supply. Ask for samples and mechanical test reports before going into full-scale production. Please confirm delivery times in writing. Add time for NDT and documentation to exceed normal forging lead times for high-criticality applications.
Inconel 718 Flanges Suppliers
Inconel 718 Flanges FAQ's
-1688635827661.webp)
-1696417870062.webp)
Related Products
