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Inconel 625 Flanges Manufacturer & Supplier | ASTM B564, UNS N06625 | India

Inconel 625 Flanges

Table of Content

Kalpataru Piping manufactures Inconel 625 flanges (UNS N06625 / DIN 2.4856 / ASTM B564) across pressure classes 150 through 2500 and PN 6 through PN 64. Alloy 625 combines ≥58 % nickel, 20–23 % chromium, and 8–10 % molybdenum to deliver outstanding corrosion resistance in chloride, acid, and high-temperature service — making it the default specification for offshore, chemical, and FGD piping systems. All flanges are supplied with EN 10204 3.1 Mill Test Certificates and full material traceability.

In-house modern production division produces both custom and standard-designed, size, shape, thickness, and pressure rated flanges to match up to all project requirements. Alloy 625 flanges undergo both destructive and non-destructive examination as mandated by standards of international standards and all the test reports and certificates are provided on delivery. We have high ex-stock stores where we keep urgent projects and shutdown orders.

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Chemical Composition of Inconel 625 Flanges (UNS N06625)

All Inconel 625 flanges supplied by Kalpataru Piping are manufactured from certified UNS N06625 material. The chemical composition per ASTM B564 is as follows:

Element Symbol Content (% by weight) Role in Alloy
Nickel Ni 58.0% min Base element — corrosion and oxidation resistance
Chromium Cr 20.0 – 23.0% High-temperature oxidation and corrosion resistance
Molybdenum Mo 8.0 – 10.0% Pitting and crevice corrosion resistance; solid solution hardening
Niobium + Tantalum Nb + Ta 3.15 – 4.15% Weld stabilisation; prevents sensitisation; matrix strengthening
Iron Fe 5.0% max Residual — kept low for corrosion performance
Cobalt Co 1.0% max Residual
Manganese Mn 0.50% max Residual
Silicon Si 0.50% max Residual
Carbon C 0.10% max Low carbon — minimises carbide precipitation
Titanium Ti 0.40% max Residual
Aluminum Al 0.40% max Residual

Mechanical Properties of Inconel 625 Flanges

Inconel 625 flanges supplied by Kalpataru Piping consistently exceed ASTM B564 minimum requirements — tensile strength typically reaches 930 MPa against the 827 MPa code minimum, and elongation averages 42.5 % against a 30 % requirement.

Property Value Unit
Tensile Strength (min) 930 MPa (135,000 psi) ASTM B564 requirement: 827 MPa (120 ksi) min
Yield Strength 0.2% offset (min) 517 MPa (75,000 psi) ASTM B564 requirement: 414 MPa (60 ksi) min
Elongation (min) 42.5% In 50mm gauge length (ASTM B564 min: 30%)
Hardness (max) 241 HB / 100 HRB As-forged and heat-treated condition
Density 8.44 g/cm³ (0.305 lb/in³) —
Melting Range 1290 – 1350°C (2350 – 2460°F) —
Elastic Modulus 207 GPa (30.1 × 10³ ksi) At room temperature
Poisson’s Ratio 0.278 —
Max. Continuous Service Temperature 982°C (1800°F) Oxidising atmosphere
Min. Service Temperature (Cryogenic) -196°C (-320°F) No ductile-to-brittle transition

Physical Properties of Inconel 625 Flanges

Property Value at 21°C (70°F) Value at 204°C (400°F) Value at 538°C (1000°F)
Density (lb/in³ / g/cm³) 0.305 / 8.44 0.305 / 8.44 0.305 / 8.44
Thermal Conductivity (Btu·in/h·ft²·°F) 68 87 139
Specific Heat (Btu/lb·°F) 0.098 0.109 0.118
Thermal Expansion (×10⁻⁶/°F) — 7.3 7.7
Elastic Modulus (×10³ ksi) 30.1 28.7 25.7
Magnetic Permeability at 200 Oe (15.9 kA/m) 1.0006 — —

Alloy 625 Flange Face Types

Face type selection depends on service pressure, temperature, and sealing requirement. Raised Face (RF) is standard for most ASME B16.5 applications; Ring Type Joint (RTJ) is mandatory above Class 600 and in subsea/HPHT service; Flat Face (FF) is used where the mating flange is cast iron or a fragile material.

  • Flat Face (FF)
  • Raised Face (RF)
  • Ring Type Joint (RTJ)
  • Lap Joint Face
  • Small Male–Female / Large Male–Female
  • Small Tongue / Large Tongue
  • Groove

Inconel 625 vs Inconel 718 Flanges — Key Differences

Parameter Inconel 625 Flanges Inconel 718 Flanges
Strength Type Solid-solution strengthened Precipitation hardened
Temperature Performance Excellent corrosion resistance at high temperatures up to 982°C Superior mechanical strength up to 649°C
Weldability Excellent — no post-weld heat treatment required Moderate — requires controlled heat treatment after welding
Corrosion Resistance Outstanding in aggressive environments (chloride, seawater, acids) Good, but less than 625 in aqueous environments
Typical Applications Chemical processing, marine, oil & gas, offshore, FGD Aerospace turbines, high-stress structural components

Inconel 625 Flanges Standards & Specifications — ASTM B564 / ASME SB564

Standard Flange Types Covered
ASME/ANSI B16.5 Weld Neck, Slip On, Blind, High Hub Blind, Socket Weld, Lap Joint, Threaded, Ring Type Joint
ASME/ANSI B16.47 Series A & B Weld Neck, Blind (large diameter — above 24″ NB)
ASME/ANSI B16.36 Weld Neck, Slip On, Threaded (orifice flanges)
BS 4504 Sec 3.1 Weld Neck, Hubbed Slip On, Hubbed Threaded, Lapped Pipe End, Plate, Loose Plate, Blank
BS 4504 Part 1 Weld Neck, Plate, Hubbed Slip-On, Hubbed Threaded, Blank, Loose Plate with Weld On Plate Collar
BS 1560 BOSS Weld Neck, Socket Welding, Blind, Slip-On, Lapped, Screwed Boss
BS10 Tables D, E, F, H Plate Slip-On, Weld Neck, Screwed Boss, Slip-On Boss, Blind
DIN DIN 2527, 2566, 2573, 2576, 2627–2638, 2641, 2642, 2655, 2656, 2673

 

Specification Parameter Details
Material Standard ASTM B564 / ASME SB564
Dimensional Standards ANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS10, EN-1092, DIN
Size Range 1/2″ (15 NB) to 60″ (1500 NB)
Pressure Classes Class 150, 300, 400, 600, 900, 1500, 2500 | PN6, PN10, PN16, PN25, PN40, PN64, PN100
Face Types Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ), Tongue & Groove, Male-Female
UNS Number N06625
DIN / Werkstoff Nr. 2.4856
EN Designation NiCr22Mo9Nb
Certification EN 10204 3.1 standard; 3.2 Third Party Inspection available on request

Inconel 625 Flange Equivalent Grades

Standard UNS Werkstoff Nr. GOST AFNOR JIS BS EN Other
Inconel 625 N06625 2.4856 ХН75МБТЮ NC22DNB4M NCF 625 NA 21 NiCr22Mo9Nb ЭИ602

Inconel 625 Weld Neck Flanges (WNRF / WNFF / WNRTJ)

Inconel 625 Weld Neck flanges are distinguished by a long tapered hub that provides reinforcement and distributes stress away from the flange-pipe junction. The bore is matched precisely to the pipe’s inner diameter, ensuring smooth, turbulence-free flow. These flanges are the standard specification for high-pressure and high-temperature critical service in offshore and chemical process piping.

  • Manufactured to ASTM B564 / ASME SB564; dimensions per ASME B16.5 (up to 24″ NB) and ASME B16.47 (above 24″ NB).
  • Available in Class 150 to Class 2500; PN 6 to PN 100.
  • Bore matched to pipe schedule: SCH 5S, 10S, 40S, 80S, 160S, XXS.
  • Face options: Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ).
  • Size range: 1/2″ NB to 60″ NB.
  • Preferred specification for subsea wellheads, offshore risers, and high-pressure chemical reactors.

Inconel 625 Blind Flanges (BLRF / BLFF / BLRTJ)

Inconel 625 Blind flanges are solid-face flanges without a bore, used to close or blank off the end of a pipeline, nozzle, or pressure vessel. They are available in all pressure classes from Class 150 to Class 2500 and in all standard face types.

  • Used for pipeline termination, branch isolation, pressure testing, and maintenance access points.
  • Large-diameter blind flanges (above 24″ NB) manufactured to ASME B16.47 Series A or B.
  • Available in standard and custom thicknesses to suit high-pressure applications.
  • Size range: 1/2″ NB to 60″ NB.
  • Heavy-wall custom blinds available for Class 1500 and Class 2500 service.

Inconel 625 Slip On Flanges (SORF / SOFF)

Inconel 625 Slip On flanges have a bore slightly larger than the pipe’s outer diameter, allowing the pipe to be inserted and then welded on both the inside and outside. They are simpler and lower-cost to install than weld neck flanges and are appropriate for low-to-medium pressure service.

  • Double-welded construction — both inside bore fillet weld and outside fillet weld for strength.
  • Easier alignment during installation vs weld neck.
  • Manufactured to ASME B16.5; available Class 150 to Class 600.
  • Size range: 1/2″ NB to 24″ NB.
  • Commonly specified in general chemical process piping, utility lines, and non-critical offshore systems.

Inconel 625 Socket Weld Flanges (SWRF)

Inconel 625 Socket Weld flanges are used for small-diameter, high-pressure piping systems. The pipe is inserted into a recessed socket in the flange and a single fillet weld is applied around the hub. The socket ensures the pipe sits at the correct insertion depth and is held concentric during welding, eliminating bore mismatch that can create turbulence in high-pressure instrumentation and injection lines.

  • Designed for small bore applications: 1/2″ NB to 4″ NB.
  • Suitable for high-pressure service: Class 600, 900, 1500, 2500.
  • No bore mismatch — socket ensures automatic pipe-to-flange alignment.
  • Used in hydraulic systems, instrumentation lines, and high-pressure chemical injection systems.

Inconel 625 Blind Flanges — Ring Type Joint (RTJ)

Inconel 625 RTJ flanges use a ring-shaped metal gasket seated in a precision-machined groove in the flange face. The ring deforms under bolt load to create a leak-proof metal-to-metal seal, the most reliable sealing arrangement for extreme pressure and temperature service.

  • Specified for Class 600, 900, 1500, and 2500 pressure classes.
  • Ring gasket materials: Soft iron, low-carbon steel, 316L SS, Inconel 625 (self-sealing in extreme service).
  • Groove dimensions and ring profiles per ASME B16.20.
  • Mandatory specification in subsea wellhead, Christmas tree, and HPHT (high-pressure high-temperature) piping systems.
  • Manufactured to ASME B16.5 and API 6A where applicable.

Inconel 625 Lap Joint Flanges

Inconel 625 Lap Joint flanges are used in conjunction with a stub end (lap joint stub end), allowing the flange to rotate freely around the pipe. This makes them ideal for systems requiring frequent dismantling for inspection, cleaning, or component replacement.

  • Flange rotates 360° — bolt holes can be aligned without rotating the pipe.
  • Only the stub end (pipe-connected component) needs to be in Inconel 625; the backing flange can be carbon steel, reducing cost in non-corrosive applications.
  • Size range: 1/2″ NB to 24″ NB.
  • Used in pharmaceutical, food processing, and chemical plants where regular maintenance access is required.

Inconel 625 Threaded Flanges

Inconel 625 Threaded flanges connect to the pipe via a threaded bore, no welding required. This makes them suitable for applications where welding is not feasible due to fire hazard, material restrictions, or access limitations.

  • Thread types: NPT, MPT, MNPT, FPT, BSPT, BSP, FNPT per ASME B1.20.1, BSPP.
  • Suitable for low-pressure systems: Class 150 to Class 600.
  • Size range: 1/2″ NB to 4″ NB.
  • Used in hazardous environments where welding is restricted (explosive atmospheres, classified areas).

Inconel 625 Flange Pressure Rating by Temperature (ASME B16.5)

The table below gives the maximum allowable working pressure (bar) for Inconel 625 flanges per ASME B16.5 Group 2.3 — the applicable material group for UNS N06625. Note the significant pressure de-rating above 500°C; select the appropriate pressure class for your operating window.

Working pressures in bar for Alloy 625 flanges across all pressure classes and operating temperatures:

Temp. (°C) Class 150 Class 300 Class 400 Class 600 Class 900 Class 1500 Class 2500
-29 to 38 20.0 51.7 68.9 103.4 155.1 258.6 430.9
50 19.5 51.7 68.9 103.4 155.1 258.6 430.9
100 17.7 51.5 68.7 103.0 154.6 257.6 429.4
150 15.8 50.3 66.8 100.3 150.6 250.8 418.2
200 13.8 48.6 64.8 97.2 145.8 243.4 405.4
250 12.1 46.3 61.7 92.7 139.0 231.8 386.2
300 10.2 42.9 57.0 85.7 128.6 214.4 357.1
350 8.4 40.3 53.6 80.4 120.7 201.1 335.3
400 6.5 36.5 48.9 73.3 109.8 183.1 304.9
450 4.6 33.7 45.1 67.7 101.4 169.0 281.8
500 2.8 28.2 37.6 56.5 84.7 140.9 235.0
538 1.4 16.5 22.1 33.1 49.6 82.7 137.9
600 — 6.6 8.9 13.3 19.9 33.2 55.3
650 — 4.7 6.3 9.5 14.2 23.6 39.4

Gasket Size of Inconel 625 Flanges (ASME B16.5)

NPS Gasket I.D. 150 LB O.D. 300 LB O.D. 600 LB O.D. 900 LB O.D.
1/2 0.84 1.875 2.125 2.125 2.50
3/4 1.06 2.25 2.625 2.625 2.75
1″ 1.31 2.625 2.875 2.875 3.125
1-1/4 1.66 3.00 3.25 3.25 3.50
1-1/2 1.91 3.375 3.75 3.75 3.875
2″ 2.38 4.125 4.375 4.375 5.625
2-1/2 2.88 4.875 5.125 5.125 6.50
3″ 3.50 5.375 5.875 5.875 6.625
4″ 4.50 6.875 7.125 7.625 8.125
6″ 6.62 8.75 9.875 10.50 11.375
8″ 8.62 11.00 12.125 12.625 14.125
10″ 10.75 13.375 14.25 15.75 17.125
12″ 12.75 16.125 16.625 18.00 19.625

Class 400 Inconel 625 DIN 2.4856 Pipe Flange Dimensions (inches)

NPS OD RF Dia. Hole Dia. No. Holes Min. Thk. Bolt Circle Hub Base SO Bore SO Len. Hub Top WN Len.
1/2 3.75 1.38 0.63 4 0.56 2.62 1.50 0.88 0.88 0.84 2.06
3/4 4.62 1.69 0.75 4 0.62 3.25 1.88 1.09 1.00 1.05 2.25
1″ 4.88 2.00 0.75 4 0.69 3.50 2.12 1.36 1.06 1.32 2.44
1-1/4 5.25 2.50 0.75 4 0.81 3.88 2.50 1.70 1.12 1.66 2.62
1-1/2 6.12 2.88 0.88 4 0.88 4.50 2.75 1.95 1.25 1.90 2.75
2″ 6.50 3.62 0.75 8 1.00 5.00 3.31 2.44 1.44 2.38 2.88
3″ 8.25 5.00 0.88 8 1.25 6.62 4.62 3.57 1.81 3.50 3.25
4″ 10.00 6.19 1.00 8 1.38 7.88 5.75 4.57 2.00 4.50 3.50
6″ 12.50 8.50 1.00 12 1.62 10.62 8.12 6.72 2.25 6.63 4.06
8″ 15.00 10.62 1.12 12 1.88 13.00 10.25 8.72 2.69 8.63 4.62
10″ 17.50 12.75 1.25 16 2.12 15.25 12.62 10.88 2.88 10.75 4.88
12″ 20.50 15.00 1.38 16 2.25 17.75 14.75 12.88 3.12 12.75 5.38
16″ 25.50 18.50 1.50 20 2.50 22.50 19.00 16.16 3.69 16.00 6.00
20″ 30.50 23.12 1.62 24 2.75 27.00 23.12 20.20 4.00 20.00 6.62
24″ 36.00 27.25 1.88 24 3.00 32.00 27.62 24.25 4.50 24.00 6.88

Inconel 625 Slip On Flange Dimensions — ASME B16.5 Class 150 (inches)

NPS OD (O) RF Dia. (R) Flange Thk. (Q) Hub Base (X) Hub Bevel (H) Socket Depth (Z) Length Thru Hub (Y) Bore (B)
1/2 3-1/2 1-3/8 7/16 1-3/16 0.84 3/8 1-7/8 0.90
3/4 3-7/8 1-11/16 1/2 1-1/2 1.05 7/16 2-1/16 1.11
1″ 4-1/4 2 9/16 1-15/16 1.32 1/2 2-3/16 1.38
1-1/2 5 2-7/8 11/16 2-9/16 1.90 5/8 2-7/16 1.97
2″ 6 3-5/8 3/4 3-1/16 2.38 11/16 2-1/2 2.46
3″ 7-1/2 5 15/16 4-1/4 3.50 13/16 2-3/4 3.60
4″ 9 6-3/16 15/16 5-5/16 4.50 15/16 3 4.60
6″ 11 8-1/2 1 7-9/16 6.63 1-1/16 3-1/2 6.75
8″ 13-1/2 10-5/8 1-1/8 9-11/16 8.63 1-1/4 4 8.75
10″ 16 12-3/4 1-3/16 12 10.75 1-5/16 4 10.92
12″ 19 15 1-1/4 14-3/8 12.75 1-9/16 4-1/2 12.92
16″ 23-1/2 18-1/2 1-7/16 18 16.00 1-3/4 5 16.19
20″ 27-1/2 23 1-11/16 22 20.00 2-1/8 5-11/16 20.25
24″ 32 27-1/4 1-7/8 26-1/8 24.00 2-1/2 6 —

Inconel 625 Flange Weight Chart (Class 150 — ASME B16.5)

NPS DN OD Flange (mm) Flange Thk. (mm) Hub Dia. (mm) RF Dia. (mm) Bolt Circle (mm) No. Bolts Bolt Size Weight (kg) Weight (lb)
1/2″ 15 89.0 11.2 30.2 35.1 60.5 4 1/2″ 0.4 0.9
3/4″ 20 98.5 12.7 38.1 42.9 69.9 4 1/2″ 0.7 1.5
1″ 25 108.0 14.2 49.3 50.8 79.3 4 1/2″ 0.8 1.8
1-1/4″ 32 117.5 15.7 58.7 63.5 88.9 4 1/2″ 1.2 2.6
1-1/2″ 40 127.0 17.5 65.0 73.2 98.6 4 1/2″ 1.5 3.3
2″ 50 152.5 19.1 77.7 91.9 120.7 4 5/8″ 2.3 5.1
2-1/2″ 65 178.0 22.4 90.4 104.6 139.7 4 5/8″ 3.7 8.1
3″ 80 190.5 23.9 108.0 127.0 152.4 4 5/8″ 4.1 9.0
4″ 100 228.5 23.9 134.9 157.2 190.5 8 5/8″ 5.9 13.0
6″ 150 279.5 25.4 192.0 215.9 241.3 8 3/4″ 8.4 18.5
8″ 200 343.0 28.4 246.1 269.7 298.5 8 3/4″ 13.0 28.6
10″ 250 406.5 30.2 304.8 323.9 362.0 12 7/8″ 18.0 39.5
12″ 300 482.5 31.8 365.3 381.0 431.8 12 7/8″ 29.0 64.0
16″ 400 597.0 36.6 457.2 469.9 539.8 16 1″ 47.0 103.0
20″ 500 698.5 42.9 558.8 584.2 635.0 20 1-1/8″ 76.0 167.0
24″ 600 813.0 47.8 663.4 692.2 749.3 20 1-1/4″ 97.0 214.0

Inconel 625 Flange Dimensional Tolerances (ASME B16.5)

Dimension Parameter Tolerance
A — OD Outside Diameter ≤ 24″ ± 1/16″ (1.6 mm)
A — OD Outside Diameter > 24″ ± 1/8″ (3.2 mm)
D — ID 10″ and smaller ± 1/32″ (0.8 mm)
D — ID 12″ to 18″ + 1/8″ (3.2 mm)
D — ID 20″ and larger – 1/16″ (1.6 mm)
B — Contact Face 1/16″ Raised Face ± 1/32″ (0.8 mm)
B — Contact Face 1/4″ RF, T&G, M&F ± 1/64″ (0.4 mm)
C — Thickness 18″ and smaller ± 1/8″ (3.2 mm), –0″
C — Thickness 20″ and larger ± 3/16″ (4.8 mm), –0″
J — Hub at Base 24″ or smaller ± 1/16″ (1.6 mm)
J — Hub at Base Over 24″ ± 1/8″ (3.2 mm)
H — Hub at Weld 5″ and smaller +3/32″ (2.4 mm), –1/32″ (0.8 mm)
H — Hub at Weld 6″ and larger +5/32″ (4.0 mm), –1/32″ (0.8 mm)
P — Drilling Bolt Circle ± 1/16″ (1.6 mm)
P — Drilling Bolt Hole Spacing ± 1/32″ (0.8 mm)
K — Hub Length 10″ and smaller ± 1/16″ (1.6 mm)
K — Hub Length 12″ and larger ± 1/8″ (3.2 mm)

Manufacturing Process of Inconel 625 Flanges

  • Raw Material Inspection: Certified Inconel 625 (UNS N06625) billets verified for chemical composition and mechanical properties per ASTM B564 before any processing begins.
  • Billet Cutting: Precision cutting to required blank sizes — minimises material wastage and ensures dimensional consistency.
  • Heating: Billets heated in temperature-controlled furnaces to optimal forging temperature, maintaining metallurgical integrity throughout.
  • Forging: Hot forging under hydraulic presses or forging hammers forms the flange shape. The forging process refines grain structure, improving strength and fatigue resistance compared to cast alternatives.
  • Heat Treatment: Solution annealing followed by controlled cooling removes internal stresses, restores ductility, and ensures corrosion resistance is fully maintained.
  • CNC Machining: Computer-controlled machining produces precise bore sizes, bolt hole patterns, flange thicknesses, and facing types to ASME B16.5 / B16.47 tolerances.
  • Surface Finishing: Grinding, polishing, or shot blasting removes scale and achieves the specified surface finish for the face type required.
  • Final Inspection: 100% dimensional inspection, PMI verification, hydrostatic testing where specified, and full documentation preparation before despatch.

Applications of Inconel 625 Flanges by Industry

Industry Application Why Inconel 625 is Specified
Oil & Gas Sour gas pipelines, subsea manifolds, offshore drilling systems, FPSO piping Resistance to H₂S, seawater chloride, high pressure; NACE MR0175 compliant
Chemical Processing Reactor vessels, acid-handling systems, heat exchangers Withstands nitric, phosphoric, and sulfuric acids; excellent crevice corrosion resistance
Power Generation Superheated steam lines, turbine exhaust, hot gas ducting up to 982°C High strength + oxidation resistance at extreme temperatures
Marine & Offshore Seawater handling, desalination plants, naval equipment Pitting and crevice corrosion resistance in chloride-saturated seawater
Aerospace & Defence Aircraft engines, thermal shielding, exhaust ducting High strength-to-weight; thermal cycling resistance; fatigue strength
Pharmaceutical & Food High-purity fluid transfer, sanitary-grade pipelines Smooth, corrosion-resistant internal surfaces; electropolishable
Pollution Control FGD scrubbers, stack liners, dampers in coal power plants Resists sulfurous acid and chloride-laden flue gas at high temperature
Petrochemical Refinery heat exchangers, distillation overhead systems Chloride stress-corrosion cracking resistance in overhead condensate systems
Nuclear ADDED Radioactive waste handling, primary coolant systems, reactor internals ASME Section III compliant; radiation-stable; corrosion resistance in boric acid coolant

Export Destinations — Inconel 625 Flanges Supply

Kalpataru Piping exports Inconel 625 flanges to over 40 countries worldwide. All export shipments include EN 10204 3.1 Mill Test Certificates, PMI reports, ISPM-15 fumigated wooden packaging, seaworthy packing, Certificate of Origin, and Commercial Invoice with HS Code 73079300 (nickel alloy flanges) for smooth customs clearance.

Region Key Countries / Cities Delivery Time (Air / Sea)
Middle East Saudi Arabia (Jubail, Dammam, Riyadh), UAE (Dubai, Abu Dhabi, Sharjah), Qatar (Doha), Kuwait, Oman (Muscat) Air: 3–5 days | Sea: 15–20 days
Southeast Asia Singapore, Malaysia, Indonesia, Thailand, Vietnam, Philippines Air: 2–3 days | Sea: 10–15 days
Europe Germany, UK (London, Aberdeen), France, Italy, Netherlands, Norway, Spain, Sweden Air: 5–7 days | Sea: 30–35 days
North America USA (Houston, Los Angeles, New York, Chicago), Canada (Calgary, Toronto), Mexico Air: 7–10 days | Sea: 45–55 days
South America Brazil, Argentina, Chile, Colombia, Venezuela, Peru Air: 10–12 days | Sea: 50–60 days
Africa Nigeria (Lagos), South Africa (Durban), Egypt, Algeria, Kenya, Ghana Air: 5–8 days | Sea: 25–35 days
East Asia Japan, South Korea, Taiwan, China Air: 3–5 days | Sea: 12–18 days
South Asia India (domestic), Bangladesh, Sri Lanka, Pakistan Air: 1–2 days | Road/Rail: 3–7 days

Saudi ARAMCO Approved Vendor: Inconel 625 flanges are regularly supplied to oil and gas EPC projects under ARAMCO Materials System Specification SAES-L-009. A complete ARAMCO documentation package — including vendor qualification records, material certifications, and ITPs — is available on request.

Inconel 625 Flange Price List — Indicative Pricing

Inconel 625 flange pricing depends on flange type, size, pressure class, quantity, and current LME nickel prices. The indicative price ranges below are based on standard stock sizes in Class 150. Prices for Class 600, 900, 1500, and 2500 are higher due to increased material weight and machining complexity. Contact us for a formal quotation with current pricing.

Flange Type Size Range Approx. Price Range (₹ / piece) Notes
Slip On Flange (SORF) 1/2″ – 24″ ₹18,000 – ₹1,20,000 Class 150; larger sizes and higher classes priced on request
Weld Neck Flange (WNRF) 1/2″ – 48″ ₹25,000 – ₹3,50,000 Class 150–2500; bore schedule affects price
Blind Flange (BLRF) 1/2″ – 60″ ₹22,000 – ₹4,50,000 Heavy-wall large-bore blinds quoted individually
Socket Weld Flange (SWRF) 1/2″ – 4″ ₹15,000 – ₹65,000 Class 600–2500
Threaded Flange 1/2″ – 4″ ₹16,000 – ₹75,000 Class 150–600; thread type affects price
Lap Joint Flange 1/2″ – 24″ ₹20,000 – ₹1,80,000 Priced without stub end
RTJ Flange 1/2″ – 24″ ₹30,000 – ₹2,50,000 Ring gasket priced separately
Spectacle Blind / Orifice / T&G Per drawing ₹40,000 – ₹6,00,000+ Custom fabrication — request quotation with drawing

For bulk project orders, framework agreements, and urgent shutdown supply, contact our sales team for best-price quotations: export@kalpatarupiping.com | +91 022-66337137

Testing and Documentation Certificates

Every Inconel 625 flange from Kalpataru Piping passes a rigorous multi-stage quality inspection programme. All flanges are tested to ASTM B564, ASME B16.5, and ASME B16.47 requirements.

Test Type Method / Standard Purpose
Chemical Composition Spectro / OES per ASTM E415 Confirms UNS N06625 alloy chemistry — Ni, Cr, Mo, Nb within specification
Tensile & Yield Testing ASTM A370 Verifies min. tensile 827 MPa (Grade 1) and yield 414 MPa
Hardness Testing Brinell / Rockwell Confirms heat treatment state; max 241 HB
PMI Testing Positive Material Identification Elemental verification on every flange by portable XRF analyser
Dimensional Inspection ASME B16.5 / B16.47 tolerance tables 100% dimensional check — OD, ID, bolt circle, bolt holes, thickness, hub
Hydrostatic Testing ASTM A999 / per code Leak-proof pressure test where required by specification
Ultrasonic Testing (UT) ASTM E213 Internal defect detection in forged body
Radiography (RT) ASTM E94 Weld integrity for weld-on components
Dye Penetrant (DPT) ASTM E165 Surface-breaking defect detection on flange faces and bores
Intergranular Corrosion (IGC) ASTM G28 Method A Sensitisation resistance verification for weld-heat-affected zones

The ASTM G28 Method A intergranular corrosion test is particularly critical for welded assemblies — it confirms that the heat-affected zone has not sensitised during welding, ensuring the flange performs to specification even after multi-pass welding operations in the field.

Documentation Supplied with Every Shipment

  • EN 10204 3.1 Mill Test Certificate (MTC) — factory certification with manufacturer’s declaration.
  • EN 10204 3.2 available — Third Party Inspection (TPI) by independent agencies on request.
  • Chemical analysis and mechanical test reports — NABL-approved lab certification.
  • PMI test report — per-piece elemental verification.
  • Dimensional inspection report — per ASME B16.5 / B16.47.
  • Hydrostatic and NDT test records where applicable.
  • Heat traceability records — raw billet to finished flange.
  • Fumigation certificate (ISPM-15) and Certificate of Origin for all export shipments.
  • Commercial Invoice with HS Code 73079300 for customs clearance.

Related Inconel 625 Products

Kalpataru Piping supplies the complete range of Inconel 625 piping components to match your flange specifications. All products share the same UNS N06625 alloy, ASTM/ASME certifications, and EN 10204 3.1 documentation:

Frequently Asked Questions About Inconel 625 Flanges

1. How suitable are Inconel 625 flanges for cryogenic applications?

Inconel 625 flanges are also characterized by high mechanical strength and toughness in cryogenic conditions to -196°C (-320°F). It is not able to fracture at low temperatures in a brittle manner, the high nickel content and solid-solution-strengthened structure makes it impossible to occur like ferritic steels which have a ductile-to-brittle transition. They can thus be used in the LNG pipelines, cryogenic storage tanks, and low-temperature process equipment without low-temperature impact testing.

2. What is the maximum service temperature of Inconel 625 flanges?

Continuous service up to 982°C (1800°F) at oxidising atmospheres is possible using Inconel 625 flanges. Exposure to 1093°C (2000°F) is tolerable in the case of intermittent or short-duration service. The table above (per ASME B16.5) is the pressure-temperature ratings that specifies the way high pressure can be operated at each operating temperature, however, the lower the temperature, the lower the allowable pressure is – above 500°C the allowable pressure drops considerably.

3. What is the coefficient of thermal expansion of Inconel 625 flanges?

The average thermal expansion rate of the Inconel 625 ranges between 21°C and 100°C is about 12.8 × 10⁻⁶/°C and between 21°C and 300°C is 13.5 × 10⁻⁶/°C. This should be taken into consideration in the design of flanged joints where the system undergoes large temperature cycles – the difference in the expansion rate of flange, pipe, and bolting material should be considered in the design of the flange joint.

4. How machinable are Inconel 625 flanges?

Inconel 625 is believed to be moderately machinable. It hardens quickly in cutting, it demands sharp tooling, low cutting speed, high feeding rate and sufficient coolant. Flange machining CNC machining of the flanges is done with carbide tools and with positive rake angles. The machining cost is high when compared to austenitic stainless steel because the alloy is tough and exhibits the work-hardening tendency, whereas the machining process is quite routine with experienced nickel alloy fabrication plants like Kalpataru pipe production.

5. What is the difference between Inconel 625 and Hastelloy C276 flanges?

Both alloys excel in corrosive environments, but they are specified for different threats. Inconel 625 has a higher niobium content for superior weld stability and performs better under cyclic thermal stress. Hastelloy C276 has a higher molybdenum content (15–17%) and is preferred where reducing acids (HCl, H₂SO₄) are the primary corrosive agent. For mixed or oxidising acid environments, Inconel 625 is typically the engineer’s first choice. Our technical team can advise on grade selection for your specific process stream — contact us with your service conditions.

6. Are your Inconel 625 flanges dual-stamped or traceable to a specific heat?

Yes. Every Inconel 625 flange supplied by Kalpataru Piping carries a heat number stamped on the flange body and traceable to the original billet. The EN 10204 3.1 Mill Test Certificate links the heat number to the chemical analysis, mechanical test results, and PMI report for that specific heat. For projects requiring 3.2 certification, third-party inspection by Bureau Veritas, SGS, TÜV, or Intertek can be arranged at the enquiry stage.

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