Incoloy 825 Flanges

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Incoloy 825 Flanges Manufacturer & Supplier in India

Incoloy 825 Flanges

Incoloy 825 flanges are made of nickel-iron-chromium alloy that is enriched with molybdenum, copper, and titanium, hence having a high resistance to corrosive environments. These flanges are designed to perform reliably in aggressive industrial conditions where resistance to oxidation, reducing acids, and chloride-induced corrosion is essential. The alloy is commonly identified as UNS N08825 (Werkstoff 2.4858) and is widely used for piping systems exposed to harsh chemical and marine environments.

ASTM B564 Incoloy 825 flanges are available in a variety of types such as weld neck, slip-on, blind, socket weld, threaded, and lap joint flanges to suit different piping configurations. Manufactured in accordance with international standards like ASME B16.5, ANSI, DIN, and EN, these flanges provide secure and leak-proof connections in high-pressure and high-temperature systems. The balanced chemical composition of Alloy 825 flanges offers excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, ensuring long service life even in demanding applications such as chemical processing plants, seawater systems, and acid production units.

Kalpataru Piping Solutions is a trusted manufacturer and supplier of Incoloy 825 flanges in India with over 15 years of industry experience, offering high-quality flanges in sizes ranging from ½″ to 48″. Our ASTM B564 UNS N08825 flanges are manufactured using premium raw materials and are tested according to strict quality standards, including mill test certification and third-party inspection. These flanges are widely preferred for their durability, dimensional accuracy, and reliable performance in critical industrial piping systems.

ASTM B564 Incoloy 825 Slip On Flanges | UNS N08825 Paddle Spacer Flanges | Incoloy 825 Spectacle Blind Flanges | Incoloy 825 Weld Neck Flanges | Incoloy 825 AWWA Flanges | Incoloy 825 Body Flanges | ASTM B564 N08825 | Flange Alloy 825 |

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Table of Contents

Incoloy 825 Flanges Specifications

Incoloy 825 Flanges are manufactured to meet a variety of international standards and specifications, ensuring compatibility and performance across multiple industries. Below are the key specifications and standards for Incoloy 825 Flanges:

Specification

Details

Standards

ASTM B564 / ASTM SB564

Dimensions

ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings

Size Range

½” to 36″

Pressure Ratings

150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64

Flange Face Type

Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ)

Standards Covered

ASTM, ASME, ANSI, DIN, EN, BS, JIS

Types of Incoloy 825 Flanges Available

Incoloy Alloy 825 Flanges are available in a variety of types, each designed to meet specific application requirements.

We manufacture Incoloy 825 flanges in various configurations to meet diverse piping requirements:

  • Weld Neck Flanges: Designed for high-pressure applications with a long tapered hub that provides reinforcement and smooth flow transition. Ideal for critical services in chemical plants and refineries.
  • Slip-On Flanges: Cost-effective option that slides over the pipe end before welding. Suitable for low-pressure applications and systems requiring easy assembly.
  • Blind Flanges: Used to close off pipe ends, valves, or pressure vessel openings. Essential for system testing, inspection access, and future expansion points.
  • Socket Weld Flanges: Provide smooth bore and high structural strength for small-diameter, high-pressure piping systems. Common in hydraulic and instrumentation lines.
  • Threaded Flanges: Feature internal threads for pipe connection without welding. Used in low-pressure applications or where welding is restricted.
  • Lap Joint Flanges: Used with stub ends for systems requiring frequent dismantling or where flange rotation is needed for bolt hole alignment.
  • Orifice Flanges: Specialized flanges with pressure taps for flow measurement using orifice plates. Critical for process control and monitoring applications.

Equivalent Material Grades of Incoloy 825 Flanges

This table helps to cross verify Incoloy 825 Flanges across major international standards.

STANDARD

WERKSTOFF NR.

UNS

AFNOR

GOST

JIS

BS

EN

OR

Incoloy 825

2.4858

N08825

NC 21 FeDU

XH38BT

NCF 825

NA 16

NiCr21Mo

ЭП703

Chemical Composition of Incoloy 825 Flanges

Grade

Chromium (Cr)

Iron (Fe)

Nickel (Ni)

Carbon (C)

Manganese (Mn)

Copper (Cu)

Silicon (Si)

Sulfur (S)

Incoloy 825

19.5–23.5%

Max 1.0%

38.0–46.0%

Max 0.05%

Max 1.0%

1.5–3.0%

Max 0.5%

Max 0.03%

 

Incoloy 825 Flanges Dimension Table (ASTM B564 / ASME B16.5)

NPS (inches)

No. of Bolts

Bolt Dia (inches)

Bolt Circle Dia (inches)

Flange Dia (inches)

Bolt Hole Dia (inches)

1/4

4

1/2

2-1/4

3-3/8

0.62

1/2

4

1/2

2-5/8

3-3/4

0.62

3/4

4

5/8

3-1/4

4-5/8

0.75

1

4

5/8

3-1/2

4-7/8

0.75

1-1/4

4

5/8

3-7/8

5-1/4

0.75

1-1/2

4

3/4

4-1/2

6-1/8

0.88

2

8

5/8

5

6-1/2

0.75

2-1/2

8

3/4

5-7/8

7-1/2

0.88

3

8

3/4

6-5/8

8-1/4

0.88

3-1/2

8

3/4

7-1/4

9

0.88

4

8

3/4

7-7/8

10

0.88

5

8

3/4

9-1/4

11

0.88

6

12

3/4

10-5/8

12-1/2

0.88

8

12

7/8

13

15

1.00

10

16

1

15-1/4

17-1/2

1.12

12

16

1-1/8

17-3/4

20-1/2

1.25

14

20

1-1/8

20-1/4

23

1.25

16

20

1-1/4

22-1/2

25-1/2

1.38

18

24

1-1/4

24-3/4

28

1.38

20

24

1-1/4

27

30-1/2

1.38

24

24

1-1/2

32

36

1.62

 

Incoloy 825 Flanges Size & Stock Availability

Standard

Size Range

Pressure Class

Flange Types

ASME B16.5

1/2” – 24”

150 – 2500 Lbs

Weld Neck, Socket Weld, Slip-On, Blind, Lap Joint, Orifice, Tongue & Groove, Spectacle, Plate

ASME B16.47 / API 605

26” – 60”

300 – 2500 Lbs

Weld Neck, Slip-On, Blind, RTJ

ASME / ANSI B16.36

1” – 24”

150 – 2500 Lbs

Weld Neck, Socket Weld, Blind

ASME B16.48 / API 590

1/2” – 24”

150 – 900 Lbs

Spectacle, Plate, Lap Joint

MSS SP-44

12” – 60”

150 – 600 Lbs

Weld Neck, Slip-On

BS 3293

26” – 48”

2000 – 20000 Psi

Weld Neck, Blind

API 6A

2 1/16” – 30”

PN6 – PN160

Weld Neck, Blind

DIN

DN10 – DN3600

PN6 – PN40

Slip-On, Weld Neck, Blind

 

Difference Between Incoloy 825 RF, FF & RTJ Flange Face Types

The different types of flange faces are designed for specific pressure, temperature and sealing requirements. Below is a comparison highlighting the key differences between these types of flanges. 

Description

FF – Flat Face

RF – Raised Face

RTJ – Ring Type Joint

Pressure Range

Low pressures

Broad

Used for higher pressures.

Gasket Type

Soft, Non-metallic

Non-metallic, Semi-metallic

Hard, Metal

Sealing Face

ID to OD

ID to raised face OD

Groove in flange face

Sealing Area

Large

Medium

Small

Class

125lbs, 250lbs

All

All, Generally ≥ 900 lbs

Temperature Range

Low temperatures

Broad

Broad

UNS N08825 Flanges ASTM & ASME Standard Classes

The standard chart of classes provides the specifications for various sizes and classes of UNS N04400 Blind Flanges. 

Standard

Diameter

Class

Number of Bolts

Bolt Size

Bolt Circle Diameter

Diameter of Bolt Hole

ANSI B16.5 Flanges

121

ANSI 900 Flanges

4

19

83

22

 

95

ANSI 300 Flanges

4

13

67

16

 

121

ANSI 1500 Flanges

4

19

83

22

 

89

ANSI 150 Flanges

4

13

60

16

 

95

ANSI 600 Flanges

4

13

67

16

AS 2129 Flange

95

Table F Flanges

4

13

67

14

 

95

Table D Flanges

4

13

67

14

 

95

Table C Flanges

4

13

67

14

 

114

Table H Flanges

4

16

83

17

 

95

Table E Flanges

4

13

67

14

 

114

Table J Flanges

4

16

83

17

AS4087 Flanges

95

PN14 Flanges

4

M12

67

14

ISO 7005 (DIN) Flange

90

PN20 Flanges

4

M14

60.5

16

 

95

PN10 Flanges

4

M12

65

14

 

80

PN6 Flanges

4

M10

55

11

 

95

PN16 Flanges

4

M12

65

14

 

95

PN40 Flanges

4

M12

65

14

 

95

PN25 Flanges

4

M12

65

14

HS Code of WNR 2.4858 Incoloy 825 Flanges

The Harmonized System (HS) Code is an internationally standardized system for classifying traded products. Below is the HS Code for Incoloy 825 Flanges, which is used for customs and international shipping.

GradeHS Code
Inconel 825 Flanges73079190

Class 150–900 Incoloy 825 Pipe Flange Dimensions

Incoloy 825 Flanges

Testing & Inspection of Alloy 825 Flanges

The testing and inspection of Alloy 825 Flanges are crucial to ensure their integrity, reliability, and performance in various industrial applications.

  • Flaring Test: The flaring test assesses the structural integrity of the flange under extreme stress. It creates an axial increment at a designated angle in the way of deformation
  • Intergranular Corrosion Test: The intergranular corrosion test assesses the intergranular integrity of Alloy 825 to facilitate its adoption into context where intergranular corrosion exists.
  • Hardness Test: The hardness test assesses how resistant the material is to indention. This is an important indication of material strength/durability.
  • Positive Material Identification: This test uses newer techniques such as X-ray fluorescence (XRF) to ensure the alloy composition and meet situational specifications.
  • Mechanical Testing: This refers to tensile test, impact test, and fatigue tests, just to name a few, and used to assess the mechanical properties of Alloy 825 to meet the applicable standard.
  • Dye Penetrant Testing: A non-destructive test uses dye to identify surface cracks and defects as an indicator of leakage.
  • Flattening Test: A test assesses material to retain its effectiveness if rolled flat and ensure there will not be crackage.
  • Eddy Current Testing: A non-destructive test to identify surface and near surface defects through induced electrical current and measuring the response.

DIN 2.4858 Incoloy 825 Flange Type Codes

The list below maps DIN 2.4858 (Incoloy 825 flanges) type codes to their standard descriptions used in procurement and drawings. Use these codes to quickly identify the required flange form during specification, RFQs and documentation.

Type CodeFlange Type / Description
101Nickel Alloy 825 Plate flange for welding
102Incoloy 825 Loose plate flange with weld on plate collar
104Alloy 825 Loose plate flange with weld-nut collar
105Incoloy Alloy 825 Blank flange
111Nickel Alloy 825 Weld neck flange
112Incoloy 825 Hubbed slip-on flange for welding
113Alloy 825 Hubbed threaded flange
121Incoloy Alloy 825 Integral flange

Dimensional Chart of ASTM B564 Alloy 825 Flanges

Below are standard flange dimensions for ASTM B564 Alloy 825, covering nominal pipe sizes with corresponding bolt counts and key diameters. This chart helps to verify compatibility during design, procurement, and QA checks. 

NPS (inches)

No. Of Bolts

Bolts Dia (inches)

Bolt Circle (inches)

Dia Of Flange (inches)

Dia Of Bolt Holes (inches)

2

8

5/8

5

6-1/2

0.75

20

24

1-1/4

27

30-1/2

1.38

1/2

4

1/2

2-5/8

3-3/4

0.62

14

20

1-1/8

20-1/4

23

1.25

3

8

3/4

6-5/8

8-1/4

0.88

1-1/4

4

5/8

3-7/8

5-1/4

0.75

18

24

1-1/4

24-3/4

28

1.38

8

12

7/8

13

15

1

1-1/2

4

3/4

4-1/2

6-1/8

0.88

16

20

1-1/4

22-1/2

25-1/2

1.38

2-1/2

8

3/4

5-7/8

7-1/2

0.88

10

16

1

15-1/4

17-1/2

1.12

4

8

3/4

7-7/8

10

0.88

24

24

1-1/2

32

36

1.62

1

4

5/8

3-1/2

4-7/8

0.75

3-1/2

8

3/4

7-1/4

9

0.88

5

8

3/4

9-1/4

11

0.88

12

16

1-1/8

17-3/4

20-1/2

1.25

3/4

4

5/8

3-1/4

4-5/8

0.75

6

12

3/4

10-5/8

12-1/2

0.88

1/4

4

1/2

2-1/4

3-3/8

0.62

Weight Chart for Incoloy 825 Slip On & Blind Flanges

Below are standard flange dimensions for ASTM B564 Alloy 825, covering nominal pipe sizes with corresponding bolt counts and key diameters. This chart helps to verify compatibility during design, procurement, and QA checks.

NPS (inches)No. Of BoltsBolts Dia (inches)Bolt Circle (inches)Dia Of Flange (inches)Dia Of Bolt Holes (inches)
285/856-1/20.75
20241-1/42730-1/21.38
1/241/22-5/83-3/40.62
14201-1/820-1/4231.25
383/46-5/88-1/40.88
1-1/445/83-7/85-1/40.75
18241-1/424-3/4281.38
8127/813151
1-1/243/44-1/26-1/80.88
16201-1/422-1/225-1/21.38
2-1/283/45-7/87-1/20.88
1016115-1/417-1/21.12
483/47-7/8100.88
24241-1/232361.62
145/83-1/24-7/80.75
3-1/283/47-1/490.88
583/49-1/4110.88
12161-1/817-3/420-1/21.25
3/445/83-1/44-5/80.75
6123/410-5/812-1/20.88
1/441/22-1/43-3/80.62

Temperature & Pressure Rating of Incoloy 825 Flanges (Class 150/300)

Values shown reflect standard Class 150 ratings; include alongside your design factors and gasket/bolting selections when finalizing specs.

Temp (°C)

Class 150

Temp (°F)

Class 150

300

10.2

500

170

400

6.5

750

95

500

2.8

950

35

100

17.7

-20~100

290

425

5.5

800

80

538

1.4

1000

20

150

15.8

200

260

325

9.3

600

140

475

3.7

900

50

200

13.8

300

230

375

7.4

700

110

250

12.1

400

200

350

8.4

650

125

450

4.6

850

65

Nickel 825 Flanges Welding Consumables & Procedures

Use the table below to pick commonly used consumables for fabricating or repairing Nickel 825 plate flanges.

Category

Consumable

WELDING ELECTRODES

Welding Electrode 112

WELDING ELECTRODES

Welding Electrode 686CPT

FILLERS

Filler Metal 625

FILLERS

Filler Metal 686CP

Pressure Ratings of Alloy 825 Flanges by Class

Use the table below to compare general pressure limits for Nickel Alloy 825 flanges across common temperatures, expressed in both psi and MPa. Apply these values with your design factors, gasket/bolting choices, and code requirements before finalizing a rating.

Class

100°F (37.8°C)

200°F (93.3°C)

400°F (204.4°C)

600°F (315.6°C)

800°F (426.7°C)

150

285 psi (2.0 MPa)

270 psi (1.9 MPa)

240 psi (1.7 MPa)

210 psi (1.4 MPa)

185 psi (1.3 MPa)

300

740 psi (5.1 MPa)

700 psi (4.8 MPa)

620 psi (4.3 MPa)

540 psi (3.7 MPa)

480 psi (3.3 MPa)

600

1480 psi (10.2 MPa)

1370 psi (9.4 MPa)

1240 psi (8.6 MPa)

1080 psi (7.5 MPa)

960 psi (6.6 MPa)

900

2220 psi (15.3 MPa)

2050 psi (14.1 MPa)

1840 psi (12.7 MPa)

1620 psi (11.1 MPa)

1440 psi (9.9 MPa)

Common Applications of Incoloy 825 Flanges

Incoloy 825 flanges are engineered for severe corrosive environments where standard materials fail:

Chemical Processing: Sulfuric acid production, phosphoric acid processing, pickling operations, and chloride-containing solutions where resistance to pitting and stress corrosion cracking is critical.

Oil & Gas: Sour gas piping systems, wellhead equipment, and offshore platforms where hydrogen sulfide and chloride exposure demand exceptional material performance.

Marine & Seawater Systems: Desalination plants, seawater cooling systems, offshore installations, and marine heat exchangers requiring resistance to chloride-induced corrosion.

Power Generation: Nuclear fuel processing, flue gas desulfurization systems, and high-temperature steam condensate lines.

Pollution Control: Scrubber systems, acid gas cleaning equipment, and wastewater treatment facilities handling aggressive chemical environments.

Mechanical Properties of ASTM B564 Incoloy 825 Flanges

Use the table below to reference typical room-temperature mechanical properties for Alloy 825 flanges as supplied to ASTM B564.

Grade

Tensile Strength

Yield Strength (0.2% Offset)

Elongation

825

80,000 psi / 550 MPa

32,000 psi / 220 MPa

30%

Physical Properties of Alloy 825 Orifice & Reducing Flanges

The table shows basic mechanical properties typical physical reference for Alloy 825 orifice and reducing flanges at room temperature. 

Property

Value

Yield Strength

310 MPa (45 ksi)

Density

8.1 g/cm³ (8100 kg/m³)

Poisson’s Ratio

0.3

Elongation

40–50%

Melting Point

1375°C (2507°F)

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  • Incoloy® 825 Forged Flanges Wholesaler
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  • Incoloy 825 DIN Flanges in India
  • Nickel Alloy 825 Flanges in Supplier

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FAQ’s About Incoloy 825 Flanges

INCOLOY 825 is a nickel-iron-chromium alloy designed for excellent resistance to acids, corrosion, and high-temperature environments, widely used in chemical processing and marine applications.
INCOLOY 825 offers superior resistance to acidic and corrosive environments due to its added molybdenum and copper, while INCOLOY 800 is designed mainly for high-temperature stability and oxidation resistance.
INCOLOY 825 can typically withstand temperatures up to 540°C (1000°F) while maintaining mechanical strength and corrosion resistance.
INCOLOY 825 is heat treated through stabilizing annealing, where the alloy is heated and rapidly cooled to enhance corrosion resistance, stabilize its microstructure, and improve overall performance.

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