Inconel 625 Flanges, Inconel 625 SO flanges, Inconel 625 Weld Neck Flanges, Inconel 625 Blind Flanges & Inconel 625 Flat Face Flanges Manufacturer and Supplier
Inconel 625 flanges are made from a nickel-chromium alloy that contains about 58% nickel and 20% chromium, along with small amounts of carbon, manganese, silicon, sulfur, copper, and iron. This composition provides good strength and resistance to corrosion and high temperatures. Solitaire Overseas manufactures and supplies Inconel 625 flanges in different types, sizes, and specifications for various industrial uses.
These flanges have a tensile strength of 930 MPa, a minimum yield strength of 517 MPa, and a melting point of 1350°C. They are used in applications where high pressure, high temperature, and resistance to corrosion are important, such as in aerospace, marine, chemical, and power industries.
Inconel 625 flanges are made from a nickel-chromium alloy that contains about 58% nickel and 20% chromium, along with small amounts of carbon, manganese, silicon, sulfur, copper, and iron. This composition provides good strength and resistance to corrosion and high temperatures. Solitaire Overseas manufactures and supplies Inconel 625 flanges in different types, sizes, and specifications for various industrial uses. These flanges have a tensile strength of 930 MPa, a minimum yield strength of 517 MPa, and a melting point of 1350°C. They are used in applications where high pressure, high temperature, and resistance to corrosion are important, such as in aerospace, marine, chemical, and power industries.
Standard Specifications & Equivalent Grades
Inconel 625 flanges are made according to strict international standards to make sure they are reliable, the right size, and compatible with other parts of high-performance piping systems. For these parts, ASTM B564—which controls the forging and machining of nickel-based alloys like Inconel—is the most often used material standard. These flanges also follow ASME SB564, guaranteeing consistency across pressure and temperature ratings needed in industrial uses.
Dimensional standards for Inconel flanges vary depending on the application and regional codes. ANSI B16.5 covers flange sizes from ½″ to 24″ across pressure classes ranging from Class 150 to 2500, while ANSI B16.47 addresses larger diameters up to 60″. European and international buyers may specify dimensions per BS 4504, EN 1092-1, or DIN standards to meet project-specific tolerances and norms.
Here is a quick reference for equivalent grades of Inconel alloys used in flange manufacturing:
Inconel Grade
UNS Number
Werkstoff Number
Inconel 600
N06600
2.4816
Inconel 625
N06625
2.4856
Inconel 718
N07718
2.4668
Inconel 825
N08825
2.4858
Inconel 601
N06601
2.4851
These grades are chosen based on things like the type of corrosion, the temperature range, and the amount of mechanical stress. ASTM B564 Inconel flanges provide consistent, code-compliant solutions worldwide whether your engineering high-pressure systems or corrosive fluid handling lines.
Types of ASTM B564 Inconel Flanges
There are different kinds of Inconel flanges made according to ASTM B564 to meet the needs of applications with a lot of stress, corrosion, and high temperatures. With remarkable mechanical strength and oxidation resistance among the several Inconel grades, Inconel 625 (UNS N06625 / Werkstoff Nr. 2.4856) is most preferred. Each flange type used in ASTM B564 Inconel 625 is thoroughly broken out below, each appropriate for particular installation and operational requirements.
Inconel 625 Flanges
These flanges are designed in accordance with ANSI B16.5/B16.47 standards, available in sizes ranging from ½″ to 48″ (custom sizes available up to 60″) and pressure ratings from Class 150 to 2500 or PN 6 to PN 100.
Slip-On (SO) Flanges
Material: Inconel 625
Standard: ASTM B564 / ANSI B16.5
Application: Used in low-pressure pipelines requiring frequent inspection
Key Industries: Marine cooling lines, desalination, and low-pressure chemical systems
Slip-On flanges offer easy alignment and installation, making them suitable for systems that don’t face extreme thermal or mechanical stress.
Weld-Neck (WN) Flanges
Material: Inconel 625
Standard: ASTM B564 / ANSI B16.5
Application: Ideal for high-pressure and high-temperature pipelines
Key Industries: Power plants, offshore oil rigs, and aerospace propulsion systems
Weld-neck flanges feature a long tapered hub that ensures smooth flow transition, minimizing erosion and turbulence at the joint.
Blind (BL) Flanges
Material: Inconel 625
Standard: ASTM B564 / ANSI B16.5
Application: Used to close off piping ends or pressure vessel openings
Key Industries: Chemical reactors, marine vessels, high-pressure test setups
Blind flanges are critical for system isolation and maintenance, offering high sealing integrity.
Threaded (TH) Flanges
Material: Inconel 625
Standard: ASTM B564 / ANSI B16.5
Application: Suitable for small-diameter, low-pressure systems
Threaded flanges allow for easy assembly without welding, often used in applications where welding is impractical.
Lap Joint (LJ) Flanges
Material: Inconel 625
Standard: ASTM B564 / ANSI B16.5
Application: Paired with stub ends, ideal for systems requiring frequent disassembly
Key Industries: Process piping, corrosion-resistant chemical transport
Lap joint flanges are preferred for their flexibility and alignment ease, especially in systems subject to frequent inspection or reconfiguration.
Reducing (RG) Flanges
Material: Inconel 625
Standard: ASTM B564 / ANSI B16.5
Application: Connect pipes of different diameters without using separate fittings
Key Industries: Power generation, multi-size pipeline systems
Reducing flanges streamline connections in systems with varying pipe sizes, saving space and improving fluid dynamics.
Ring-Type Joint Flange (RTJ)
Material: Inconel 625
Standard: ASTM B564 / ANSI B16.5
Application: High-pressure and high-temperature sealing systems
Key Industries: Subsea equipment, refineries, gas processing
RTJ flanges feature a precision-machined groove for a metallic ring gasket, ensuring leak-proof performance under extreme pressure.
Each of these ASTM B564 Inconel 625 flange types is engineered for demanding industrial applications, providing unmatched durability, corrosion resistance, and thermal performance—particularly where standard alloys fall short.
Chemical Composition of ASTM B564 Inconel Flanges
According to ASTM B564, Inconel flanges are made from high-performance nickel-based alloys like Inconel 625 and Inconel 600, which are known for being very resistant to high temperatures and harsh environments that corrode metals. These flanges' excellent qualities directly follow from their precisely balanced chemical composition.
The nominal chemical composition for Inconel 625 is broken out below together with a comparison to Inconel 600 as specified in the ASTM B564 standard.
ASTM B564 Inconel 625 – Chemical Composition (% by Weight)
Element
Minimum (%)
Maximum (%)
Nickel (Ni)
58.0
Balance
Chromium (Cr)
20.0
23.0
Molybdenum (Mo)
8.0
10.0
Iron (Fe)
—
5.0
Niobium (Nb) + Tantalum (Ta)
3.15
4.15
Cobalt (Co)
—
1.0
Carbon (C)
—
0.10
Manganese (Mn)
—
0.50
Silicon (Si)
—
0.50
Sulfur (S)
—
0.015
Phosphorus (P)
—
0.015
Aluminum (Al)
—
0.40
Titanium (Ti)
—
0.40
These compositions guarantee consistent performance of Inconel 600 and Inconel 625 flanges in corrosive surroundings including chemical processing systems, offshore oil rigs, and marine applications. Inconel 625 is perfect for important service conditions since the presence of molybdenum, niobium, and chromium clearly improves its mechanical strength and pitting resistance.
Mechanical Properties of ASTM B564 Inconel 625 Flanges
ASTM B564 Inconel 625 flanges exhibit exceptional mechanical performance in environments that demand both strength and corrosion resistance. Engineered from a nickel-chromium-molybdenum-niobium alloy, these flanges maintain structural integrity under high pressures and elevated temperatures, making them suitable for critical applications across marine, aerospace, and chemical industries.
The table below outlines the typical mechanical properties of Inconel 625 flanges as specified in ASTM B564:
Mechanical Properties of ASTM B564 Inconel Flanges
Property
Value
Tensile Strength (min)
827 MPa (120,000 psi)
Yield Strength (0.2% offset)
414 MPa (60,000 psi)
Elongation
30% (minimum in 50 mm gauge length)
Hardness (Brinell)
≤ 220 HB
Modulus of Elasticity
~207 GPa (30 x 10³ ksi)
Melting Point
1290–1350°C (2350–2460°F)
Density
8.44 g/cm³ (0.305 lb/in³)
These properties highlight the alloy's ability to resist creep, stress rupture, and fatigue in extreme service conditions. Inconel 625’s high tensile and yield strength stem from solid solution strengthening and precipitation hardening, making it a preferred material in systems handling high pressure and aggressive media.
When choosing flanges for demanding environments, the mechanical durability of Inconel 625 per ASME SB564 makes it a reliable and long-lasting option.
Inconel UNS N06625 Pipe Flanges Size and Pressure Rating
Inconel flanges manufactured under ASTM B564 are available in a broad range of sizes, pressure ratings, and dimensional standards to suit global industrial requirements. These flanges conform to international norms including ANSI B16.5, ANSI B16.47 Series A/B, BS 4504, EN 1092-1, and DIN specifications.
Below is an overview of the standard dimensioning and pressure class ranges:
Standard
Pressure Ratings
Size Range
Key Applications
ANSI B16.5
Class 150 to 2500
½″ to 24″ (custom up to 60″)
High-pressure systems in refineries, chemical plants, and offshore platforms.
ANSI B16.47 Series A & B
Class 75 to 900
26″ to 60″
Large-diameter piping systems for critical pressure services.
BS 4504 / EN 1092-1
PN 2.5 to PN 40
DN 15 to DN 2000
Widely used in European and international projects requiring metric standards.
DIN Standard
PN 6 to PN 100
DN 15 to DN 2000
Known for applications across European industries and legacy systems.
Applications & Industries Served
Inconel 625 flanges are engineered for extreme conditions—making them indispensable in industries where corrosion, heat, and pressure pose serious challenges. Known for their performance in aggressive environments, these flanges are widely adopted across a range of high-stakes sectors:
Oil & Gas: Ideal for sour gas pipelines, subsea manifolds, and offshore drilling systems where exposure to hydrogen sulfide, high pressure, and chloride-rich seawater demands unmatched material reliability.
Chemical Processing Plants: Frequently used in reactor vessels, acid-handling systems, and heat exchangers where resistance to nitric, phosphoric, and sulfuric acids is critical to operational safety and durability.
Power Generation: Inconel 625 flanges excel in superheated steam lines, turbine exhaust systems, and hot gas conduits operating at temperatures up to 982 °C, thanks to their exceptional creep and oxidation resistance.
Marine & Offshore Structures: The alloy’s resilience against pitting, crevice corrosion, and chloride-induced stress cracking makes it a top choice for seawater handling systems, desalination units, and naval equipment.
Aerospace & Defense: Trusted in aircraft engines, thermal shielding, and exhaust ducting, these flanges provide strength and structural stability under rapid thermal cycling and high mechanical stress.
Pharmaceutical & Food Industries: Preferred in high-purity fluid transfer systems, Inconel 625 flanges offer smooth internal finishes, cleanability, and corrosion resistance—essential for sanitary-grade applications.
Each application benefits from the alloy’s unique combination of mechanical durability and corrosion resistance, making ASTM B564 Inconel flanges a trusted choice in mission-critical environments.
Why Choose Solitaire Overseas for Inconel Flanges?
When it comes to precision engineering, global reach, and reliable performance, Solitaire Overseas emerges as a trusted manufacturer and supplier of Inconel flanges, with a strong emphasis on Inconel 625. Backed by in-house forging and CNC machining, we ensure tight dimensional control, faster lead times, and superior quality. As an ISO 9001 and NACE MR0175 certified company, we provide Material Test Certificates (MTCs) with every batch, ensuring full traceability. Our extensive stock—ranging from ½″ to 48″—enables rapid dispatch for both routine and time-sensitive requirements. We also offer custom fabrication solutions with a 10–30 day turnaround for unique specifications. With a logistics network spanning 45+ countries, we support DAP/DDP shipping globally. Additionally, clients benefit from free metallurgical consulting, expert guidance, and competitive pricing on bulk orders. Whether for complex industrial applications or rapid project needs, Solitaire Overseas delivers Inconel flanges that align with the highest international standards.
Frequently Asked Questions (FAQ)
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. It’s ideal for heat exchangers, exhaust ducts, offshore platforms, and reactor vessels.
Inconel 625 offers excellent weldability and corrosion resistance, making it ideal for high-temperature environments. Inconel 725, while similar in composition, is age-hardened for significantly higher strength and is used in applications requiring superior mechanical properties.
Yes, Inconel 625 is highly weldable and is known for maintaining its mechanical strength and corrosion resistance after welding. It supports various welding methods including TIG and MIG, making it a preferred material for complex assemblies and structural fabrications.
Yes, Inconel alloys, particularly Inconel 625, are generally stronger than stainless steel, especially at elevated temperatures. While stainless steel is cost-effective and corrosion-resistant, Inconel offers superior mechanical strength and thermal stability in extreme environments.
Among Inconel grades, Inconel 718 is considered the strongest due to its age-hardening capabilities and excellent tensile, fatigue, and creep-rupture strength. It’s extensively used in aerospace engines and nuclear reactors where high mechanical performance is critical.
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Table of Content
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