Stainless Steel 347 Flanges Stockist & Supplier Worldwide
Do you need a highly efficient SS 347 Flanges, that can meet all your high temperature and corrosive service requirement needs? Being one of the foremost Stainless steel 347 flanges manufacturers, suppliers and exporters from India, we serve you as the most appropriate solution to cater to all your requirement needs. We deal with a comprehensive of ASTM certified flanges for all the high-temperature and corrosive service applications like the Oil & Gas industry, Chemical process industry, Refineries, Power Generation, Heat Exchanger and offshore jobs.
We produce SS 347 Flange, Weld neck flanges, blind flanges, slip on flanges, socket weld flanges, threaded flanges, lap joint flanges, custom designed flange solutions that comply with the varied international standards such as the ASTM A182, ASME B16.5, ASME B16.47, EN 1092-1 and DIN standards.
Every Stainless Steel 347 flanges and 347 H are made from the best quality and stabilised grade 347 and 347 H stainless steel which helps the alloy withstand corrosion due to carbide precipitation and intergranular attack, in case of high temperature and continuous service conditions.
What are Stainless Steel 347 Flanges?
Niobium-stabilized austenitic stainless steel pipe flanges for high-temperature service where resistance to intergranular corrosion and carbide precipitation is required. ASTM A182 F347 flanges provide excellent oxidation resistance, strength in creep applications, improved strength of performance and durability for applications within refinery, power plant, chemical processing and heat exchanger systems.
Why Choose SS 347 Flanges?
Stainless Steel 347 is used because the addition of columbium (niobium) stabilizes the material, avoiding chromium carbide precipitation on welding and on prolonged exposure to higher temperatures. The benefit of this is enhanced corrosion resistance and use up to 870C on long service times.
Key Benefits of SS 347 Flanges
Excellent resistance to intergranular corrosion
Superior oxidation resistance at elevated temperatures
Good creep and stress rupture properties
Excellent weldability without post-weld annealing
High mechanical strength
Suitable for cyclic heating and cooling applications
Long service life in aggressive industrial environments
347 Stainless Steel Flanges Properties
The properties of 347 stainless steel flanges make them suitable for a wide range of industrial applications. Below are some of the key properties:
- Corrosion Resistance: 347 stainless steel flanges offer excellent resistance to corrosion, particularly against intergranular corrosion. This makes them ideal for applications where the material is exposed to harsh environments or corrosive substances.
- High-Temperature Resistance: The columbium stabilization in 347 SS flanges allows them to maintain their strength and corrosion resistance even at elevated temperatures. They can withstand continuous service at temperatures up to 1500°F (816°C).
- Weldability: 347 stainless steel flanges exhibit good weldability, making them easy to fabricate and install in various piping systems. The alloy is less prone to sensitization, reducing the risk of weld decay.
- Mechanical Strength: These flanges possess high mechanical strength, making them capable of withstanding high pressures and stress in demanding applications.
- Oxidation Resistance: Stainless steel flanges have excellent oxidation resistance, preventing the formation of scales on the surface at high temperatures, which is crucial in applications involving thermal cycling.
347 Stainless Steel Flanges Advantages
When it comes to choosing the right flange material, 347 grade stainless steel flanges offer several advantages that make them a preferred choice in various industries:
- Long-Lasting Performance: Due to their exceptional corrosion resistance and high-temperature capabilities, 347 SS flanges provide long-lasting performance even in harsh environments, reducing the need for frequent replacements.
- Versatility: These flanges are versatile and can be used in a wide range of applications, including chemical processing, petrochemical, power generation, and aerospace industries.
- Cost-Effective: Although 347 SS flanges may have a higher initial cost compared to some other materials, their durability and low maintenance requirements make them a cost-effective solution in the long run.
- Reliable in High-Temperature Applications: The ability of 347 SS flanges to maintain their properties at elevated temperatures makes them reliable in high-temperature applications, such as heat exchangers, boilers, and furnace components.
- Resistance to Carbide Precipitation: The columbium stabilization in 347 stainless steel prevents carbide precipitation, which can lead to intergranular corrosion. This makes these flanges ideal for applications involving welding or prolonged exposure to high temperatures.
ASTM A182 F347 Flanges Supplier in India
As a proficient ASTM A182 F347 Flanges Supplier, we deal with a full spectrum ofForged Flanges as per ASTM A182, which are ideally used in piping systems with high temperature fluids, steam, chemical fluids and corrosive media.
Every flange is subjected to thorough quality check, dimensional verification, PMI checks, mechanical checks and corrosion test to satisfy all international standards.
Available Types
- Weld Neck Flanges
- Slip On Flanges
- Blind Flanges
- Socket Weld Flanges
- Threaded Flanges
- Lap Joint Flanges
- Spectacle Blind Flanges
- Orifice Flanges
- Long Weld Neck Flanges
- Ring Type Joint Flanges
H2: Types of Stainless Steel 347 & 347H Flanges
We manufacture and supply a complete range of SS 347 Flanges and SS 347H Flanges in accordance with ASTM A182, ASME B16.5, ASME B16.47, DIN, EN, and JIS standards. Each flange type is designed to meet specific pressure, temperature, and piping requirements across various industries.
Stainless Steel 347 Weld Neck Flange
The 347 stainless steel weld neck flange is designed with a long tapered hub that provides excellent reinforcement and stress distribution. It is widely used in high-pressure and high-temperature piping systems where reliability is critical.
Features:
- Superior strength and fatigue resistance
- Ideal for extreme pressure applications
- Excellent flow characteristics
- Suitable for refinery and power plant piping
ASTM A182 F347 Slip On Flange
As a leading ASTM A182 F347 Slip On Flange Manufacturer in India, we supply precision-machined slip-on flanges that slide over the pipe and are welded from both sides.
Benefits:
- Easy alignment and installation
- Economical compared to weld neck flanges
- Suitable for low and medium-pressure systems
- Reduced fabrication costs
UNS S34700 Blind Flange
The UNS S34700 Blind Flange is used to seal the end of a piping system or pressure vessel opening. It provides complete closure while allowing future expansion and maintenance access.
Applications:
- Pressure vessels
- Storage tanks
- Process piping
- Hydrostatic testing systems
B16.47 F347H Blind Flanges
Our B16.47 F347H Blind Flanges are manufactured for large-diameter pipelines and heavy-duty industrial applications requiring reliable pressure retention and corrosion resistance.
ANSI B16.5 SS 347H Slip On Flange
We stock and supply ANSI B16.5 SS 347H Slip On Flange products suitable for elevated temperature services where improved creep resistance and strength are required.
Stainless Steel 347 Socket Weld Flange
Socket weld flanges are commonly used in small-diameter high-pressure piping systems. The pipe is inserted into a socket and welded around the flange perimeter.
Advantages:
- Strong leak-proof connection
- Ideal for small bore piping
- Smooth internal flow
Stainless Steel 347 Threaded Flange
Threaded flanges are connected to threaded pipes without welding, making them suitable for applications where welding is difficult or undesirable.
Common Uses:
- Hazardous environments
- Low-pressure systems
- Maintenance-friendly installations
Stainless Steel 347 Lap Joint Flange
Lap joint flanges are used with stub ends and are ideal for systems requiring frequent dismantling and inspection.
Benefits:
- Easy bolt hole alignment
- Reduced maintenance time
- Reusable design
Stainless Steel 347 Spectacle Blind Flange
Spectacle blind flanges provide a convenient method of isolating sections of piping for maintenance while ensuring operational safety.
Stainless Steel 347 Orifice Flange
Orifice flanges are specifically designed to facilitate flow measurement and instrumentation in process pipelines.
Stainless Steel 347 Long Weld Neck Flange
Long weld neck flanges are commonly used in pressure vessels, columns, and heat exchanger applications where additional reinforcement is required.
Schedule and Size Chart
| Nominal Pipe Size (NPS) | Outside Diameter (OD) (inches) | Flange Thickness (inches) | Bolt Circle Diameter (inches) | Number of Bolts | Bolt Diameter (inches) | Weight (lbs) |
| 1/2″ | 3.50 | 0.88 | 2.38 | 4 | 0.50 | 3.0 |
| 1″ | 4.25 | 0.94 | 2.75 | 4 | 0.50 | 4.0 |
| 2″ | 6.00 | 1.00 | 5.00 | 4 | 0.63 | 7.5 |
| 4″ | 9.00 | 1.19 | 7.88 | 8 | 0.63 | 18.0 |
| 6″ | 11.00 | 1.31 | 9.75 | 8 | 0.75 | 28.0 |
| 8″ | 13.50 | 1.50 | 11.75 | 8 | 0.75 | 43.0 |
| 10″ | 16.00 | 1.62 | 14.25 | 12 | 0.88 | 61.0 |
| 12″ | 19.00 | 1.75 | 17.00 | 12 | 0.88 | 90.0 |
| 14″ | 21.00 | 1.88 | 18.75 | 12 | 1.00 | 113.0 |
| 16″ | 23.50 | 2.00 | 21.25 | 16 | 1.00 | 155.0 |
Mechanical Properties Chart
| Property | Value |
| Tensile Strength (MPa) | 515 (min) |
| Yield Strength 0.2% Proof (MPa) | 205 (min) |
| Elongation (% in 2 inches) | 35 (min) |
| Hardness (Brinell) | 217 (max) |
| Hardness (Rockwell B) | 95 (max) |
| Modulus of Elasticity (GPa) | 193-200 |
| Poisson’s Ratio | 0.27-0.30 |
| Melting Point (°C) | 1398-1446 |
Specifications Chart
| Standard | Specification |
| ASTM/ASME | A182 / SA182 |
| DIN | 1.4550 |
| BS | 347S31 |
| EN | X6CrNiNb18-10 |
| UNS | S34700 |
| JIS | SUS 347 |
| SAE | 30347 |
Chemical Composition Chart
| Element | Composition (%) |
| Chromium (Cr) | 17.00 – 19.00 |
| Nickel (Ni) | 9.00 – 13.00 |
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Silicon (Si) | 0.75 max |
| Columbium (Nb) | 10 x (C+N) – 1.00 max |
Physical Properties Chart
| Property | Value |
| Density (g/cm³) | 7.98 |
| Thermal Conductivity (W/m·K) | 16.3 @ 100°C |
| Electrical Resistivity (µΩ·cm) | 72 @ 20°C |
| Specific Heat Capacity (J/kg·K) | 500 @ 0-100°C |
| Coefficient of Thermal Expansion (µm/m°C) | 16.6 @ 0-100°C |
| Magnetic Permeability (µ) | 1.02 (approx.) |
Applications of Stainless Steel 347 Flanges
Due to their excellent resistance to corrosion and elevated temperatures, Stainless Steel 347 and 347H flanges are widely used in:
Petrochemical Industry
Used in high-temperature process piping systems.
Oil & Gas Sector
Suitable for offshore platforms and refinery operations.
Power Generation
Ideal for steam pipelines, boilers, and turbines.
Chemical Processing
Resistant to corrosive chemicals and process fluids.
Heat Exchangers
Performs reliably under cyclic thermal conditions.
Aerospace Components
Used in exhaust systems and high-temperature assemblies.
Related Product Grades :
Why Customers Choose Us?
- Extensive inventory availability
- Competitive global pricing
- Fast delivery schedules
- Custom manufacturing capabilities
- Complete material traceability
- International packaging standards
- Export expertise across multiple industries
- Dedicated technical support
Whether you require a single flange or bulk project quantities, we provide dependable solutions backed by industry experience and stringent quality controls.
Frequently Asked Questions
What is the difference between SS 347 and SS 347H flanges?
SS 347H contains a higher carbon content than SS 347, providing improved high-temperature strength and creep resistance for elevated temperature applications.
What are ASTM A182 F347 flanges used for?
ASTM A182 F347 flanges are used in refineries, petrochemical plants, power stations, heat exchangers, and high-temperature piping systems.
Are UNS S34700 weld neck flanges suitable for high pressure?
Yes. UNS S34700 weld neck flanges are specifically designed for high-pressure and high-temperature applications requiring superior structural integrity.
Why choose SS 347 flanges over SS 304 flanges?
SS 347 offers enhanced resistance to carbide precipitation and intergranular corrosion, making it more suitable for welded and elevated-temperature environments.
What standards are available for Stainless Steel 347 flanges?
Common standards include ASTM A182, ASME B16.5, ASME B16.47, EN 1092-1, DIN, BS, and JIS specifications.
Global Reach
ASC LLP boasts a robust global presence, committed to delivering unparalleled service and quality to clients around the world. Our dedication to prompt delivery and exceptional customer care sets us apart in the industry. Major corporations across the USA, Europe, Asia, and other regions place their trust in our high-quality Stainless Steel 347 Flanges. This widespread trust underscores our reputation for reliability and excellence. By consistently meeting and exceeding the expectations of our international clientele, we continue to solidify our position as a leader in the global steel market.
Countries We Export To
UNITED STATES, EUROPE, UK, UAE, SAUDI ARABIA, OMAN, KUWAIT, JORDAN, QATAR, INDONESIA, MALAYSIA, BRAZIL, SPAIN, ITALY, FRANCE, GERMANY, BAHRAIN, SRI LANKA, AZERBAIJAN, AUSTRALIA, AUSTRIA, PHILIPPINES, TURKEY, RUSSIA, IRAN, IRAQ, CANADA, KOREA, JAPAN, YEMEN, FINLAND, ZIMBABWE, HUNGARY, PORTUGAL, VIETNAM, MOROCCO, THAILAND, SOUTH AFRICA, MEXICO, SINGAPORE, GREECE, KUWAIT, POLAND, NEW ZEALAND, SWEDEN, SWITZERLAND, BELGIUM, BHUTAN, BANGLADESH, TAIWAN, ROMANIA, CAMBODIA, KAZAKHSTAN, AFGHANISTAN.
