Solitaire Overseas is an ISO 9001 & NACE MR0175 certified manufacturer, supplier and global exporter of Inconel 625 Flanges (ASTM B564 UNS N06625). We stock sizes from ½″ to 48″ across all pressure classes and flange types, with rapid dispatch available to 45+ countries.
What Are Inconel 625 Flanges?
Inconel 625 flanges are precision-forged materials that are made of a nickel-chromium-molybdenum-niobium superalloy. Alloy 625 flanges weigh in at a minimum nickel content of 58 percent and considerable amounts of chromium (20–23 percent), molybdenum (8–10 percent) and niobium (3.15–4.15 percent) to provide an unprecedented blend of corrosion resistance, mechanical strength and thermal stability that is not possible in any standard stainless steel.
The molybdenum addition has a synergistic effect with the niobium addition — niobium hardens alloy matrix against creep and fatigue, whilst molybdenum gives chloride-rich seawater and reducing acid performance. The end product is a flange that is structurally sound from cryogenic temperatures up to 982 °C (1800 °F).
These flanges are manufactured to ASTM B564 / ASME SB564 and dimensioned in accordance with ANSI B16.5, B16.47, DIN, BS 4504, and EN 1092-1 and are the standard selection in offshore oil and gas, chemical processing, marine engineering, power generation, and aerospace uses where failure can never be considered an option.
Primary forging standard for nickel-based alloy flanges including Inconel 625
ANSI / ASME
ANSI / ASME B16.5
Dimensional standard for pipe flanges ½″ to 24″, Class 150 to 2500
ANSI / ASME
ASME B16.47 Series A & B
Large-diameter flanges 26″ to 60″, Class 75 to 900
MSS
MSS SP-44
Steel pipeline flanges, 12″ to 60″, Class 150 to 900
EN / BS
EN 1092-1 / BS 4504
European standard PN 6 to PN 160, DN 15 to DN 2000
NACE
NACE MR0175 / ISO 15156
Sour gas service compliance for H₂S-containing environments
API
API 6A / API 605
Wellhead and Christmas-tree equipment pressure ratings
AMS
AMS 5599 / AMS 5869
Aerospace material specification for Inconel 625 sheet and bar
HS Code for Alloy 625 Flanges Import / Export
Product
HS Code
Notes
Inconel 625 Flanges
75072000
Used on all commercial invoices and customs documentation
Equivalent Grade of Inconel 625 Flanges
Standard Body
Designation
Description
UNS
N06625
Unified Numbering System (USA)
Werkstoff Nr.
2.4856
European / DIN designation
EN
NiCr22Mo9Nb
European Norm chemical designation
JIS
NCF 625
Japanese Industrial Standard
BS
NA 21
British Standard
AFNOR
NC22DNB4M / NC23FeA
French Standard
Trade name
Nicrofer® 6020
ThyssenKrupp / VDM trade name
Chemical Composition of ASTM B564 Inconel 625 (% by Weight)
Element
Min (%)
Max (%)
Nickel (Ni)
58.0
Balance
Chromium (Cr)
20.0
23.0
Molybdenum (Mo)
8.0
10.0
Niobium (Nb) + Tantalum (Ta)
3.15
4.15
Iron (Fe)
—
5.0
Cobalt (Co)
—
1.0
Carbon (C)
—
0.10
Manganese (Mn)
—
0.50
Silicon (Si)
—
0.50
Phosphorus (P)
—
0.015
Sulfur (S)
—
0.015
Aluminum (Al)
—
0.40
Titanium (Ti)
—
0.40
Why this composition matters: Mo + Nb provide solid-solution strengthening and prevent sensitization during welding. The high Ni base ensures non-magnetic behaviour (permeability: 1.0002) and exceptional aqueous corrosion immunity — including resistance to pitting in acidified 6% FeCl₃ at 40°C (104°F).
Pitting Resistance Benchmark: Inconel 625 resists pitting corrosion in acidified 6% FeCl₃ at 40°C (104°F) and passes the ASTM G48 standard — the key qualification benchmark for seawater service components. This performance is not achievable with 316L stainless steel.
Annealing / Heat Treatment: Per ASTM B564, Inconel 625 may be supplied annealed (870–980°C / 1600–1800°F). Annealing controls grain size and optimises corrosion resistance. Higher annealing temperatures increase grain growth and improve creep resistance for elevated-temperature service.
Mechanical Properties of ASTM B564 Inconel 625 Flanges
Property
Value (SI)
Value (Imperial)
Tensile Strength (min)
827 – 1034 MPa
120,000 – 150,000 psi
Yield Strength (0.2% offset)
414 – 655 MPa
60,000 – 95,000 psi
Elongation
30 – 42% (in 50 mm gauge)
30–42%
Hardness (Brinell)
145 – 220 HB
—
Modulus of Elasticity
~207 GPa
30 × 10³ ksi
Melting Point
1290 – 1350°C
2350 – 2460°F
Density
8.44 g/cm³
0.305 lb/in³
Inconel 625 achieves its high strength through solid-solution strengthening and precipitation hardening — making it significantly stronger than standard stainless steel, particularly at elevated temperatures where stainless steel softens rapidly. Its creep and stress-rupture resistance make alloy 625 flanges the preferred choice in systems handling high pressure, aggressive media, and fluctuating thermal loads.
Types of ASTM B564 Inconel 625 Flanges
All flange types available in RF, FF, and RTJ face finishes with surface options of spiral, concentric, serrated, mirror, and smooth.
Inconel 625 Slip-On (SORF) Flanges
Inconel 625 Weld Neck (WNRF) Flanges
Inconel 625 Blind (BLRF) Flanges
Inconel 625 Socket Weld (SWRF) Flanges
Inconel 625 Threaded (THRF) Flanges
Inconel 625 Lap Joint (LJRF) Flanges
Inconel 625 Reducing (RG) Flanges
Inconel 625 Ring-Type Joint (RTJ) Flanges
Inconel 625 Orifice Flanges
Inconel 625 Spectacle Blind Flanges
Inconel 625 Spectacle Blind Flanges
Inconel 625 Spectacle Blind Flanges
Available Face Types for Alloy 625 Flanges
Face Code
Face Type
RF
Raised Face
FF
Flat Face
RTJ
Ring-Type Joint
TG
Tongue & Groove
MFM
Male & Female
LMF
Large Male & Female
Supporting Materials for Alloy 625 Flanges
Item
Material / Grade
Standard
Spiral Wound Gaskets
Inconel 625 / PTFE filler
ASME B16.20
Stud Bolts & Nuts
Inconel 625 / Alloy 625
ASTM B446 / ASME B18.2
RTJ Gaskets (Oval)
Inconel 625 Soft Iron / Alloy 625
ASME B16.20
RTJ Gaskets (Octagonal)
Inconel 625
ASME B16.20
Inconel UNS N06625 Flange Sizes & Pressure Ratings
Dimensional Standard
Size Range
Pressure Rating / Class
Applications
ASME / ANSI B16.5
½″ to 24″ (custom to 60″)
Class 150 to 2500 Lbs
High-pressure systems in refineries, chemical plants, offshore
ASME B16.47 Series A & B
26″ to 60″
Class 75 to 900
Large-diameter critical pressure piping
ASME / ANSI B16.36
1″ to 24″
Class 300 to 2500 Lbs
Orifice flanges for flow metering
ASME B16.48 / API 590
½″ to 24″
Class 150 to 2500 Lbs
Line blinds, spectacle blinds
MSS-SP-44
12″ to 60″
Class 150 to 900 Lbs
Steel pipeline flanges
BS 4504 / EN 1092-1
DN 15 to DN 2000
PN 2.5 to PN 40
European industrial and process projects
DIN Flanges
DN 10 to DN 3600
PN 6 to PN 160
European legacy systems, high-pressure DIN applications
API 6A
2-1/16″ to 30″
2000 – 20,000 Psi
Wellhead, Christmas tree equipment
Alloy 625 Flange Pressure Rating Table (bar)
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
100
17.7
51.5
68.7
103.0
154.6
257.6
429.4
200
13.8
48.6
64.8
97.2
145.8
243.4
405.4
300
10.2
42.9
57.0
85.7
128.6
214.4
357.1
400
6.5
36.5
48.9
73.3
109.8
183.1
304.9
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
Inconel 625 Slip-On Raised-Face Flange Dimensions (ANSI B16.5, Class 150)
NPS
O.D.
R.F. Dia.
Min. Thickness
Hub O.D. Base
Hub O.D. Top
Socket Depth
Hub Length
½
3.50
1.38
0.44
1.19
0.88
0.38
0.62
¾
3.88
1.69
0.50
1.50
1.09
0.44
0.69
1
4.25
2.00
0.56
1.94
1.36
0.50
0.75
1½
5.00
2.88
0.62
2.56
1.90
0.56
0.88
2
6.00
3.62
0.69
3.06
2.38
0.62
1.00
3
7.50
5.00
0.75
4.50
3.57
0.75
1.12
4
9.00
6.19
0.94
5.56
4.57
0.88
1.25
6
11.00
8.50
1.00
7.75
6.63
1.00
1.44
8
13.50
10.62
1.12
9.69
8.63
1.12
1.63
10
16.00
12.75
1.19
11.88
10.75
1.25
1.88
12
19.00
15.00
1.25
14.00
12.75
1.38
2.00
14
21.00
16.25
1.38
15.19
14.00
1.44
2.12
16
23.50
18.50
1.44
17.31
16.00
1.56
2.25
18
25.00
21.00
1.56
19.56
18.00
1.69
2.38
20
27.50
23.00
1.69
21.69
20.00
1.75
2.50
24
32.00
27.25
1.88
25.94
24.00
1.88
2.75
UNS N06625 Blind Flange Thickness by Schedule (mm)
NPS
O.D.
Sch 5
Sch 10
Sch 40
Sch 80
Sch 120
Sch 160
XXS
½
3.50
0.65
0.65
0.65
0.65
0.65
0.65
0.65
¾
3.88
0.65
0.65
0.65
0.65
0.65
0.65
0.65
1
4.25
0.66
0.66
0.66
0.66
0.66
0.66
0.66
1½
5.00
0.75
0.75
0.75
0.75
0.75
0.75
0.75
2
6.00
0.75
0.75
0.75
0.75
0.75
0.75
0.75
3
7.50
0.88
0.88
0.88
0.88
0.94
1.00
1.12
4
9.00
0.94
0.94
0.94
1.00
1.06
1.19
1.31
6
11.00
1.00
1.00
1.00
1.06
1.19
1.31
1.50
8
13.50
1.12
1.12
1.12
1.19
1.31
1.44
1.69
10
16.00
1.19
1.19
1.25
1.38
1.50
1.62
1.88
12
19.00
1.25
1.25
1.38
1.50
1.62
1.75
2.00
14
21.00
1.38
1.38
1.50
1.62
1.75
1.88
2.12
16
23.50
1.44
1.44
1.56
1.69
1.88
2.00
2.25
18
25.00
1.56
1.56
1.69
1.81
2.00
2.12
2.38
20
27.50
1.69
1.69
1.75
1.94
2.12
2.25
2.50
24
32.00
1.88
1.88
1.94
2.12
2.31
2.50
2.75
Gasket Size for Inconel 625 Flanges (inches)
NPS
Gasket I.D.
150 LB O.D.
300 LB O.D.
600 LB O.D.
900 LB O.D.
½
0.84
1.875
2.125
2.125
2.50
¾
1.06
2.25
2.625
2.625
2.75
1
1.31
2.625
2.875
2.875
3.125
1½
1.91
3.375
3.75
3.75
3.875
2
2.38
4.125
4.375
4.375
5.625
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
11.0
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
Applications & Industries Served
Oil & Gas: Inconel 625 flanges for sour gas pipelines, subsea manifolds, offshore drilling, and H₂S-resistant service per NACE MR0175.
Chemical Processing: Reactor vessels, acid-handling systems, heat exchangers — resistant to HNO₃, H₃PO₄, H₂SO₄.
Power Generation: Superheated steam lines, turbine exhausts, hot gas conduits up to 982°C.
Petrochemical: Flare stacks, flue gas scrubbers, catalyst recovery systems.
Chloride-Induced SCC Resistance: The stable austenitic microstructure of Alloy 625 — maintained by its high nickel content — prevents stress corrosion cracking even in hot chloride environments where 316L stainless steel rapidly fails. This makes Inconel 625 flanges indispensable in seawater desalination and coastal chemical plants.
Global Supply Destinations: Inconel 625 Flanges supplied to Houston (USA) • Riyadh & Al Jubail (Saudi Arabia) • Dubai (UAE) • Rotterdam (Netherlands) • Singapore • Aberdeen (UK) • Mumbai (India) — and 45+ countries worldwide.
Testing, Inspection & Documentation
Testing Methods
Hydrostatic Testing
Visual Inspection
Hardness Test
PMI (Positive Material ID)
Tensile Testing
X-Ray / Radiography
Non-Destructive Testing (NDT)
Ultrasonic Testing
Magnetic Particle Test
Pressure Testing
Documents Supplied
Material Test Certificates (MTC)
EN 10204 Type 3.1 & 3.2
Quality Assurance Plan (QAP)
Chemical Reports
Mechanical Test Reports
100% Radiography Report
Third Party Inspection
Heat Treatment Charts
Material Traceability Records
Fumigation Certificates
Certificate of Origin
NABL Approved Lab Reports
Key Import Documents for International Buyers
All Inconel 625 Flange exports include: Commercial Invoice with HS Code 75072000, Packing List, Bill of Lading, Mill Test Certificate (EN 10204 3.1), Certificate of Origin, and Fumigation Certificate. Additional CBAM compliance documentation available for European Union buyers on request.
Inconel 625 Slip-On Flange Price List (FOB Mumbai, Indicative)
Prices are indicative and subject to change based on Ni/Mo spot market rates.
Size (NPS)
Indicative Price (USD/kg)
Size (NPS)
Indicative Price (USD/kg)
½″
US$ 1.86
3½″
US$ 76.23
¾″
US$ 24.18
4″
US$ 104.11
1″
US$ 22.61
5″
US$ 123.28
1¼″
US$ 31.22
6″
US$ 130.61
1½″
US$ 34.41
8″
US$ 184.21
2″
US$ 41.52
10″ and above
Contact for quote
2½″
US$ 48.01
3″
US$ 49.90
Prices above are for Class 150 SORF (Slip-On Raised Face) flanges. Prices vary based on pressure class, flange type, quantity, and market conditions.
Prices last updated: Q1 2026. Subject to Ni/Mo spot market fluctuations. Contact us for current purchase order pricing.
Solitaire Overseas ships Inconel 625 flanges to 45+ countries via DAP/DDP Incoterms. Express dispatch available for stocked sizes.
Why Buy Inconel 625 Flanges from Solitaire Overseas?
In-House Forging & CNC Tight dimensional control with faster lead times through our integrated manufacturing facility — no outsourcing of critical processes. Backed by 20+ years of manufacturing and export experience in nickel alloy flanges.
ISO 9001 & NACE Certified Every batch ships with full Material Test Certificates (MTC) per EN 10204 3.1/3.2, ensuring complete traceability.
Extensive Stock ½″ to 48″ available from stock — enabling rapid dispatch for both routine orders and time-sensitive project requirements.
Custom Fabrication 10–30 day turnaround for non-standard specifications including custom sizes, special alloy blends, and unique face configurations.
Global Logistics DAP/DDP shipping to 45+ countries with experienced freight partnerships ensuring compliant documentation and on-time delivery.
Metallurgical Consulting Free expert guidance on alloy selection, corrosion scenarios, and pressure-temperature suitability — supporting your engineering decisions.
Competitive Bulk Pricing Volume discounts, reseller pricing for local traders, and transparent quotations with no hidden charges.
NACE Sour Service Flanges comply with NACE MR0175 / ISO 15156 for H₂S-containing environments. Approved supplier for NACE sour service — materials supplied to oil & gas operators in Saudi Arabia, Netherlands, and Norway.
Ready to Order Inconel 625 Flanges?
Contact our sales team at sales@solitaire-overseas.com or call +91-9619103479 for a fast, no-obligation quote on any Inconel 625 flange type, size, or pressure class.
Inconel 625 is widely used in marine, aerospace, chemical processing, and power generation industries due to its exceptional resistance to corrosion, oxidation, and high temperatures. Key applications include heat exchangers, exhaust ducts, offshore platforms, reactor vessels, subsea equipment, and gas turbine components.
Inconel 625 offers excellent weldability and corrosion resistance in aqueous environments — ideal for flanges in marine and chemical processing. Inconel 718 is age-hardened for significantly higher tensile strength (up to 1380 MPa) and is preferred where maximum mechanical performance is the priority, such as aerospace turbine discs and jet engine components.
Yes. Inconel 625 is among the most weldable of all nickel superalloys. It supports TIG (GTAW), MIG (GMAW), and submerged arc welding without post-weld heat treatment in most applications. The alloy maintains its corrosion resistance and mechanical strength across the heat-affected zone, making it ideal for complex fabricated assemblies.
Yes. At room temperature, Inconel 625 has a tensile strength of 827–1034 MPa versus 515–620 MPa for 316L stainless steel. More importantly, at elevated temperatures above 500°C, Inconel 625 retains most of its strength while stainless steel degrades rapidly. It also far outperforms stainless steel in chloride pitting resistance and stress corrosion cracking immunity.
Werkstoff Nr. 2.4856 is the European / DIN designation for Inconel 625 (UNS N06625). It is equivalent to EN NiCr22Mo9Nb, JIS NCF 625, BS NA 21, and AFNOR NC22DNB4M. All refer to the same nickel-chromium-molybdenum-niobium alloy commonly known by the trade name Inconel 625.
Solitaire Overseas provides: Material Test Certificates (MTC) per EN 10204 3.1/3.2, chemical and mechanical test reports, Quality Assurance Plan (QAP), material traceability records, heat treatment charts, fumigation certificates, certificate of origin, third-party inspection reports, and the commercial invoice with HS Code 75072000.\
All standard flange types are available: Slip-On (SORF), Weld Neck (WNRF), Blind (BLRF), Socket Weld (SWRF), Threaded, Lap Joint (LJRF), Reducing, Ring-Type Joint (RTJ), Orifice, Spectacle Blind, Tongue & Groove, and Plate flanges — all to ASTM B564 / ASME SB564 in sizes ½″ to 48″ (custom to 60″).
Every shipment includes an EN 10204 Type 3.1 Mill Test Certificate, heat-treatment record, NACE compliance letter (if applicable), PMI report, and full export documentation (commercial invoice, packing list, certificate of origin, fumigation certificate, BL/AWB).
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vishal@solitaire-overseas.com
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India
Iran
Thailand
South Korea
Turkey
Morocco
Costa Rica
Kazakhstan
Philippines
Canada
Japan
Russia
United States
Saudi Arabia
Kuwait
Singapore
Malaysia
UAE
Germany
Italy
China
UK
Egypt
Vietnam
Oman
Australia
Qatar
Portugal
Nigeria
Iraq
Ukraine
Bangladesh
Poland
Romania
Cyprus
Angola
Colombia
Norway
Chile
Mexico
South Africa
Netherlands
Brazil
France
Jordan
Spain
Hong Kong
Indonesia
Taiwan
Tobago
Greece
Czechia
Belgium
Sri Lanka
Myanmar
Venezuela