Stainless Steel 347/347H Flanges are niobium-stabilized austenitic stainless steel flanges developed for superior resistance to intergranular corrosion and oxidation at elevated temperatures. These flanges are extensively used in petrochemical plants, refineries, power generation units, heat exchangers, and industrial piping systems where high-temperature strength and durability are critical. Gopal Forge Industries™ manufactures premium-quality SS 347/347H Flanges that comply with international standards and demanding industrial requirements.
Stainless Steel 347/347H Flanges, Stainless Steel 347/347H Flanges Manufacturers, Stainless Steel 347/347H Flanges Suppliers, Stainless Steel 347/347H Flanges Stockists, Stainless Steel 347/347H Flanges Exporters
As experienced manufacturers, Gopal Forge Industries™ produces Stainless Steel 347/347H Flanges using advanced forging and machining technologies. Our manufacturing process ensures dimensional accuracy, exceptional mechanical strength, and long service life. The stabilization provided by niobium helps these flanges maintain structural integrity in high-temperature environments, making them a preferred choice for critical process industries.
Recognized among leading exporters, Gopal Forge Industries™ supplies Stainless Steel 347/347H Flanges to customers across international markets. Our export-quality flanges are available in multiple pressure classes, dimensions, and flange configurations to meet diverse project requirements. Their excellent resistance to oxidation and carbide precipitation makes them suitable for demanding applications in energy, chemical, and offshore sectors.
As reliable suppliers, we maintain a comprehensive inventory of Stainless Steel 347/347H Flanges to support urgent industrial requirements. Available in weld neck, slip-on, blind, socket weld, threaded, and lap joint configurations, these flanges integrate seamlessly into modern piping systems. We also supply pipe fittings, buttweld fittings, carbon steel elbow, stainless steel elbow, and complete industrial piping solutions for turnkey projects.
Being trusted stockists, Gopal Forge Industries™ ensures prompt availability of Stainless Steel 347/347H Flanges in various sizes and pressure ratings. Our extensive stock enables faster deliveries and reduced procurement lead times for contractors, fabricators, and EPC companies. Each flange undergoes strict quality inspections to ensure reliable performance in critical service conditions.
Our reputation as specialized manufacturers is built on delivering products that meet ASME, ASTM, ANSI, DIN, and EN specifications. Stainless Steel 347 Flanges provide outstanding resistance to sensitization, while 347H Flanges offer enhanced creep strength and improved performance at elevated temperatures. These characteristics make them ideal for thermal processing and heavy industrial applications.
As dedicated suppliers, we work closely with customers to provide technically suitable flange solutions based on operating pressure, temperature, and application requirements. Our team offers expert support for material selection and project planning, helping industries achieve reliable and efficient piping performance with minimal maintenance concerns.
Stainless Steel 347/347H Flanges Manufacturers in India, Stainless Steel 347/347H Flanges Suppliers in India, Stainless Steel 347/347H Flanges Stockists in India, Stainless Steel 347/347H Flanges Exporters in India
Stainless Steel 347/347H Flanges Specification
| Property |
Details |
| Product Name |
Stainless Steel 347 / 347H Flanges |
| Technical Description |
Stainless Steel 347/347H Flanges are forged stainless steel pipe flanges manufactured from ASTM A182 F347 and F347H materials. They offer excellent resistance to intergranular corrosion, oxidation, and high-temperature service, making them suitable for demanding industrial piping and process applications. |
| Material Grades |
ASTM A182 F347, ASTM A182 F347H |
| Available Sizes |
1/2" NB to 48" NB; larger sizes available on request |
| Standards |
ASME B16.5, ASME B16.47, ANSI, ASTM, DIN, EN, BS, JIS |
| Flange Types |
Weld Neck, Slip On, Blind, Socket Weld, Threaded, Lap Joint, Ring Type Joint (RTJ), Spectacle Blind |
| Facing Types |
Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Pressure Ratings |
Class 150, 300, 400, 600, 900, 1500, 2500 |
| Dimensions |
Manufactured as per ASME B16.5 and ASME B16.47 dimensional requirements, with customized dimensions available according to project specifications |
| Manufacturing Process |
Forged, Heat Treated, CNC Machined |
| Heat Treatment |
Solution Annealed |
| Density |
7.96 g/cm³ |
| Melting Range |
Approximately 1400°C – 1450°C |
| Tensile Strength |
515 MPa Min |
| Yield Strength |
205 MPa Min |
| Elongation |
35% Min |
| Hardness |
95 HRB Max |
| Corrosion Resistance |
Excellent resistance to intergranular corrosion, oxidation, and high-temperature environments |
| Applications |
Petrochemical Plants, Refineries, Power Generation, Heat Exchangers, Chemical Processing, Industrial Piping Systems |
| Features |
Excellent High-Temperature Strength, Superior Oxidation Resistance, Good Weldability, and Long Service Life |
| Testing |
PMI Testing, Ultrasonic Testing (UT), Hydrostatic Testing, Hardness Testing, Dimensional Inspection, Visual Inspection |
| Certification |
EN 10204 3.1 Mill Test Certificate (MTC), NACE MR0175/ISO 15156 compliance on request |
| Surface Finish |
Machined, Pickled, Polished, Natural Finish |
| Country of Origin |
India |
| Manufacturer |
Gopal Forge Industries™ |
Stainless Steel 347/347H Flanges Chemical Composition
| Grade |
C |
Mn |
Si |
P |
S |
Cr |
Ni |
Nb + Ta |
| SS 347 |
0.08 Max |
2.00 Max |
1.00 Max |
0.045 Max |
0.030 Max |
17.0 - 19.0 |
9.0 - 13.0 |
10 x C Min, 1.00 Max |
| SS 347H |
0.04 - 0.10 |
2.00 Max |
1.00 Max |
0.045 Max |
0.030 Max |
17.0 - 19.0 |
9.0 - 13.0 |
10 x C Min, 1.00 Max |
Stainless Steel 347/347H Flanges Mechanical Properties
| Grade |
Tensile Strength (MPa) |
Yield Strength (MPa) |
Elongation (%) |
Hardness (HRB) |
Density (g/cm³) |
| SS 347 |
515 Min |
205 Min |
35 Min |
95 Max |
7.96 |
| SS 347H |
515 Min |
205 Min |
35 Min |
95 Max |
7.96 |
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FAQ's
Stainless Steel 347/347H Flanges are corrosion-resistant piping components
manufactured from stabilized austenitic stainless steel. Grade 347 is stabilized with
columbium (niobium), while 347H is the higher-carbon version designed for improved
high-temperature strength and performance.
Common types of Stainless Steel 347/347H Flanges include:
- Weld Neck Flanges
- Slip-On Flanges
- Blind Flanges
- Socket Weld Flanges
- Threaded Flanges
- Lap Joint Flanges
Stainless Steel 347/347H Flanges offer excellent resistance to intergranular corrosion,
good oxidation resistance, and reliable performance at elevated temperatures. Grade 347H
also provides higher creep and stress-rupture strength, making it suitable for demanding
high-temperature piping applications.
Stainless Steel 347/347H Flanges are commonly used in:
- Petrochemical and chemical processing plants
- Oil & gas industries
- Power generation plants
- Heat exchangers and high-temperature piping systems
- Refineries
- Process and industrial equipment
Stainless Steel 347/347H Flanges can be manufactured according to applicable flange
dimensional and material standards, including ASME B16.5 for pipe flanges
and flanged fittings. Material specifications such as ASTM A182 are also
commonly used for forged stainless steel flanges, depending on the required application
and specification.
Application of Stainless Steel 347/347H Flanges
Latest Price List of Stainless Steel 347/347H Flanges
The market price of Stainless Steel 347/347H Flanges varies according to flange type, size, pressure class, material grade, and order quantity. Standard industrial sizes are generally available at competitive market rates, while customized dimensions and higher pressure classes may carry premium pricing. For current quotations, project pricing, and export inquiries, customers are encouraged to contact Gopal Forge Industries™ directly.
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