Incoloy 825 Flanges
Incoloy 825 Flanges are made from UNS N08825, a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. The high alloy content provides Alloy 825 with resistance to oxidising and reducing acid environments. It performs reliably against sulphuric acid, phosphoric acid, seawater, and chloride-containing media. The titanium addition stabilises the alloy against sensitisation in welded joints. These flanges are used in chemical processing, oil and gas sour service, flue gas desulphurisation, fertiliser production, and marine applications where 316L Stainless Steel is insufficient, but full nickel alloys exceed the project budget.
Price of Incoloy 825 Flanges
The estimated price per kg and per unit of Incoloy 825 flanges, and the factors affecting their rates, are explained below.
Approx Price Range
Incoloy 825 flanges are priced at approximately 25% above bar rates per kg. The ASTM B564 UNS N08825 flanges are priced at around ₹1,500 – ₹3,125 per kg, depending on the market conditions.
Price Per Unit / Kg
The rough price per unit of Incoloy 825 flanges is ₹465 to ₹85,000, depending on specifications such as flange type (e.g., slip-on, blind) and dimensions. For larger-bore or high-pressure class flanges, per-piece pricing is standard. Ask your supplier for both rate options before confirming an order.
Factors Affecting Price
Nickel and molybdenum market rates, flange type, NPS size, pressure class, surface finish, certification requirements, and order volume all affect the final cost of UNS N08825 flanges.
Types of Alloy 825 Flanges
Incoloy 825 flanges are available in a full range of types to suit different piping configurations, pressure ratings, and installation methods.
- 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)
UNS N08825 Flanges Specifications
The table below covers the key specification parameters for Incoloy 825 flanges as per international standards.
|
Parameter |
Details |
|
Standard |
ASTM B564 / ASME SB564 |
|
Dimensions |
ASME B16.5, B16.47 Series A & B, B16.48, DIN, BS4504, EN-1092, JIS B2220 |
|
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 |
|
Manufacture |
Forged, Hot rolled, CNC machined |
|
Finish |
Plain, Pickled & Passivated, Electro-polished |
Chemical Composition of Incoloy 825 Flanges
The composition below shows the molybdenum and copper additions that extend corrosion resistance of UNS N08825 beyond standard austenitic Stainless Steel grades.
|
Element |
Composition (%) |
|
Nickel (Ni) |
38.0 – 46.0 |
|
Iron (Fe) |
Balance |
|
Chromium (Cr) |
19.5 – 23.5 |
|
Molybdenum (Mo) |
2.5 – 3.5 |
|
Copper (Cu) |
1.5 – 3.0 |
|
Titanium (Ti) |
0.6 – 1.2 |
|
Carbon (C) |
0.05 max |
|
Manganese (Mn) |
1.0 max |
|
Silicon (Si) |
0.5 max |
|
Aluminium (Al) |
0.2 max |
|
Sulphur (S) |
0.03 max |
Mechanical Properties of ASTM B564 Incoloy 825 Flanges
The mechanical values below apply to ASTM B564 UNS N08825 forged flange material in the annealed condition.
|
Property |
Value |
|
Tensile Strength |
586 MPa (85,000 psi) min |
|
Yield Strength (0.2% offset) |
241 MPa (35,000 psi) min |
|
Elongation |
30% min |
|
Hardness |
Max 100 HRB |
Physical Properties of DIN 2.4858 Flanges
The physical properties below help engineers assess thermal behaviour and confirm material suitability for service temperature requirements.
|
Property |
Value |
|
Density |
8.14 g/cm³ |
|
Melting Range |
1370 – 1400°C (2500 – 2550°F) |
|
Specific Heat |
440 J/kg·°C |
|
Thermal Conductivity |
11.1 W/m·K (at 100°C) |
|
Electrical Resistivity |
1.13 µΩ·m |
|
Modulus of Elasticity |
196 GPa |
|
Coefficient of Thermal Expansion |
14.0 µm/m°C (20–100°C) |
Dimension Chart of Alloy 825 Flanges
The table below lists standard weld neck raised face (WNRF) flange dimensions for Incoloy 825 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 N08825 Flanges
Incoloy 825 flanges are available across a wide size range to cover both standard and large-bore piping systems under international specifications.
|
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 825 Flanges
The pressure-temperature ratings below apply to Incoloy 825 flanges per ASME B16.5 Group 2.5. 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 |
19.6 |
51.1 |
102.1 |
153.2 |
255.3 |
425.5 |
|
50 |
19.2 |
50.1 |
100.1 |
150.1 |
250.1 |
416.8 |
|
100 |
17.7 |
46.6 |
93.2 |
139.8 |
233.0 |
388.3 |
|
150 |
16.1 |
42.6 |
85.3 |
127.9 |
213.2 |
355.3 |
|
200 |
14.8 |
38.6 |
77.3 |
115.9 |
193.2 |
322.0 |
|
250 |
13.4 |
35.4 |
70.8 |
106.2 |
177.0 |
295.0 |
|
300 |
12.1 |
32.4 |
64.8 |
97.2 |
162.0 |
270.0 |
|
375 |
10.2 |
27.4 |
54.8 |
82.2 |
137.0 |
228.3 |
|
425 |
8.6 |
22.8 |
45.6 |
68.3 |
113.8 |
189.7 |
|
450 |
7.4 |
19.3 |
38.6 |
57.9 |
96.5 |
160.8 |
Key Features of Incoloy 825 Flanges
Alloy 825 flanges offer a balanced combination of corrosion resistance and mechanical strength that positions them between 316L Stainless Steel and full nickel alloys.
- Resistance to sulphuric and phosphoric acids across a wide concentration range
- Molybdenum and copper additions extend pitting and crevice corrosion resistance beyond 316L Stainless Steel
- Resistance to stress corrosion cracking in chloride environments
- Titanium stabilisation prevents sensitisation in heat-affected zones after welding
- Suitable for sour gas service per NACE MR0175
- Good performance in seawater and brine environments
- Wide temperature service range from cryogenic to 450°C
- Cost-effective alternative to full nickel alloys such as Hastelloy C276 for combined acid service
Applications of UNS N08825 Flanges
Incoloy 825 is a strong alternative in applications where regular Stainless Steel grades are not suitable due to their extensive corrosion resistance.
- Chemical Processing
- Oil and Gas (Sour Service)
- Flue Gas Desulphurisation
- Nuclear Fuel Reprocessing
- Marine and Offshore
- Fertiliser Manufacturing
- Pickling and Acid Cleaning
- Pharmaceutical Manufacturing
How to Choose the Right Incoloy 825 Flanges Supplier?
Consider the following things when choosing the right Incoloy 825 flange supplier.
Supplier Selection Criteria
Stock availability in multiple flange types, sizes, and pressure classes is the first check. Incoloy 825 is a speciality alloy and is not as readily available as standard Stainless grades. Confirm the supplier holds WNRF and blind flanges in Class 150 and Class 300 as ready inventory for standard NPS sizes. Sourcing from a supplier experienced in nickel alloys rather than general flange distributors reduces the risk of lead time.
Technical Considerations
Request mill test reports certifying composition and mechanical properties to ASTM B564 and ASME SB564. NACE MR0175 limits check for hardness against sour service. Compare flange dimensions to ASME B16.5 pressure class tables for your NPS. For welded assemblies, ensure MTC states titanium content 0.6 to 1.2% to provide stabilisation against sensitisation.
Quality and Certification Check
EN 10204 / 3.1 mill test certificates with heat number traceability are the baseline. Request IGC test records for corrosion critical service as per ASTM A262. Material identity is confirmed by PMI reports on finished flanges. ISO 9001 certification is a minimum. For offshore or petrochemical projects, check the NACE and PED compliance documentation before confirming the order.
Procurement Tips for Bulk Orders
Incoloy 825 prices track nickel and molybdenum markets. Lock in rates at order placement on long projects. The blanket purchase order reduces the per-unit cost of a repeated procurement. Request samples and test reports before accepting a full production batch. Get delivery timelines in writing. If you have an emergency need, check to see if the supplier has flange stock rather than forging and machining lead times.
Incoloy 825 Flanges are made from UNS N08825, a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. The high alloy content provides Alloy 825 with resistance to oxidising and reducing acid environments. It performs reliably against sulphuric acid, phosphoric acid, seawater, and chloride-containing media. The titanium addition stabilises the alloy against sensitisation in welded joints. These flanges are used in chemical processing, oil and gas sour service, flue gas desulphurisation, fertiliser production, and marine applications where 316L Stainless Steel is insufficient, but full nickel alloys exceed the project budget.
Price of Incoloy 825 Flanges
The estimated price per kg and per unit of Incoloy 825 flanges, and the factors affecting their rates, are explained below.
Approx Price Range
Incoloy 825 flanges are priced at approximately 25% above bar rates per kg. The ASTM B564 UNS N08825 flanges are priced at around ₹1,500 – ₹3,125 per kg, depending on the market conditions.
Price Per Unit / Kg
The rough price per unit of Incoloy 825 flanges is ₹465 to ₹85,000, depending on specifications such as flange type (e.g., slip-on, blind) and dimensions. For larger-bore or high-pressure class flanges, per-piece pricing is standard. Ask your supplier for both rate options before confirming an order.
Factors Affecting Price
Nickel and molybdenum market rates, flange type, NPS size, pressure class, surface finish, certification requirements, and order volume all affect the final cost of UNS N08825 flanges.
Types of Alloy 825 Flanges
Incoloy 825 flanges are available in a full range of types to suit different piping configurations, pressure ratings, and installation methods.
- 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)
UNS N08825 Flanges Specifications
The table below covers the key specification parameters for Incoloy 825 flanges as per international standards.
|
Parameter |
Details |
|
Standard |
ASTM B564 / ASME SB564 |
|
Dimensions |
ASME B16.5, B16.47 Series A & B, B16.48, DIN, BS4504, EN-1092, JIS B2220 |
|
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 |
|
Manufacture |
Forged, Hot rolled, CNC machined |
|
Finish |
Plain, Pickled & Passivated, Electro-polished |
Chemical Composition of Incoloy 825 Flanges
The composition below shows the molybdenum and copper additions that extend corrosion resistance of UNS N08825 beyond standard austenitic Stainless Steel grades.
|
Element |
Composition (%) |
|
Nickel (Ni) |
38.0 – 46.0 |
|
Iron (Fe) |
Balance |
|
Chromium (Cr) |
19.5 – 23.5 |
|
Molybdenum (Mo) |
2.5 – 3.5 |
|
Copper (Cu) |
1.5 – 3.0 |
|
Titanium (Ti) |
0.6 – 1.2 |
|
Carbon (C) |
0.05 max |
|
Manganese (Mn) |
1.0 max |
|
Silicon (Si) |
0.5 max |
|
Aluminium (Al) |
0.2 max |
|
Sulphur (S) |
0.03 max |
Mechanical Properties of ASTM B564 Incoloy 825 Flanges
The mechanical values below apply to ASTM B564 UNS N08825 forged flange material in the annealed condition.
|
Property |
Value |
|
Tensile Strength |
586 MPa (85,000 psi) min |
|
Yield Strength (0.2% offset) |
241 MPa (35,000 psi) min |
|
Elongation |
30% min |
|
Hardness |
Max 100 HRB |
Physical Properties of DIN 2.4858 Flanges
The physical properties below help engineers assess thermal behaviour and confirm material suitability for service temperature requirements.
|
Property |
Value |
|
Density |
8.14 g/cm³ |
|
Melting Range |
1370 – 1400°C (2500 – 2550°F) |
|
Specific Heat |
440 J/kg·°C |
|
Thermal Conductivity |
11.1 W/m·K (at 100°C) |
|
Electrical Resistivity |
1.13 µΩ·m |
|
Modulus of Elasticity |
196 GPa |
|
Coefficient of Thermal Expansion |
14.0 µm/m°C (20–100°C) |
Dimension Chart of Alloy 825 Flanges
The table below lists standard weld neck raised face (WNRF) flange dimensions for Incoloy 825 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 N08825 Flanges
Incoloy 825 flanges are available across a wide size range to cover both standard and large-bore piping systems under international specifications.
|
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 825 Flanges
The pressure-temperature ratings below apply to Incoloy 825 flanges per ASME B16.5 Group 2.5. 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 |
19.6 |
51.1 |
102.1 |
153.2 |
255.3 |
425.5 |
|
50 |
19.2 |
50.1 |
100.1 |
150.1 |
250.1 |
416.8 |
|
100 |
17.7 |
46.6 |
93.2 |
139.8 |
233.0 |
388.3 |
|
150 |
16.1 |
42.6 |
85.3 |
127.9 |
213.2 |
355.3 |
|
200 |
14.8 |
38.6 |
77.3 |
115.9 |
193.2 |
322.0 |
|
250 |
13.4 |
35.4 |
70.8 |
106.2 |
177.0 |
295.0 |
|
300 |
12.1 |
32.4 |
64.8 |
97.2 |
162.0 |
270.0 |
|
375 |
10.2 |
27.4 |
54.8 |
82.2 |
137.0 |
228.3 |
|
425 |
8.6 |
22.8 |
45.6 |
68.3 |
113.8 |
189.7 |
|
450 |
7.4 |
19.3 |
38.6 |
57.9 |
96.5 |
160.8 |
Key Features of Incoloy 825 Flanges
Alloy 825 flanges offer a balanced combination of corrosion resistance and mechanical strength that positions them between 316L Stainless Steel and full nickel alloys.
- Resistance to sulphuric and phosphoric acids across a wide concentration range
- Molybdenum and copper additions extend pitting and crevice corrosion resistance beyond 316L Stainless Steel
- Resistance to stress corrosion cracking in chloride environments
- Titanium stabilisation prevents sensitisation in heat-affected zones after welding
- Suitable for sour gas service per NACE MR0175
- Good performance in seawater and brine environments
- Wide temperature service range from cryogenic to 450°C
- Cost-effective alternative to full nickel alloys such as Hastelloy C276 for combined acid service
Applications of UNS N08825 Flanges
Incoloy 825 is a strong alternative in applications where regular Stainless Steel grades are not suitable due to their extensive corrosion resistance.
- Chemical Processing
- Oil and Gas (Sour Service)
- Flue Gas Desulphurisation
- Nuclear Fuel Reprocessing
- Marine and Offshore
- Fertiliser Manufacturing
- Pickling and Acid Cleaning
- Pharmaceutical Manufacturing
How to Choose the Right Incoloy 825 Flanges Supplier?
Consider the following things when choosing the right Incoloy 825 flange supplier.
Supplier Selection Criteria
Stock availability in multiple flange types, sizes, and pressure classes is the first check. Incoloy 825 is a speciality alloy and is not as readily available as standard Stainless grades. Confirm the supplier holds WNRF and blind flanges in Class 150 and Class 300 as ready inventory for standard NPS sizes. Sourcing from a supplier experienced in nickel alloys rather than general flange distributors reduces the risk of lead time.
Technical Considerations
Request mill test reports certifying composition and mechanical properties to ASTM B564 and ASME SB564. NACE MR0175 limits check for hardness against sour service. Compare flange dimensions to ASME B16.5 pressure class tables for your NPS. For welded assemblies, ensure MTC states titanium content 0.6 to 1.2% to provide stabilisation against sensitisation.
Quality and Certification Check
EN 10204 / 3.1 mill test certificates with heat number traceability are the baseline. Request IGC test records for corrosion critical service as per ASTM A262. Material identity is confirmed by PMI reports on finished flanges. ISO 9001 certification is a minimum. For offshore or petrochemical projects, check the NACE and PED compliance documentation before confirming the order.
Procurement Tips for Bulk Orders
Incoloy 825 prices track nickel and molybdenum markets. Lock in rates at order placement on long projects. The blanket purchase order reduces the per-unit cost of a repeated procurement. Request samples and test reports before accepting a full production batch. Get delivery timelines in writing. If you have an emergency need, check to see if the supplier has flange stock rather than forging and machining lead times.
Incoloy 825 Flanges Suppliers
Incoloy 825 Flanges FAQ's
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