Stainless Steel 347 Flanges Supplier In India
Comprehensive Technical Supply Guide to UNS S34700 / W.Nr. 1.4550 Stainless Steel 347 Weld Neck, Slip-On, Blind, Socket Weld, Threaded & Lap Joint Flanges Supplied by Arrow Piping India
Complete Metallurgical & Specification Guide for Stainless Steel 347 Flanges (UNS S34700 SS Flanges) Supplied Worldwide by Arrow Piping
Sourcing high-performance, precision-forged stainless steel flange components requires partnering with a certified and experienced Stainless Steel 347 Flanges Supplier In India. In critical processing environments—ranging from chemical processing plants and high-temperature refinery operations to power generation and boiler installations—standard unstabilized steel flanges frequently suffer from intergranular corrosion or sensitization in post-weld and thermal cycling conditions. Stainless Steel 347 (UNS S34700 / W.Nr. 1.4550 / ASTM A182 F347) represents columbium-stabilized 18/10 austenitic stainless steel metallurgy. Engineered with intentional additions of Columbium (Niobium) and Tantalum, Stainless Steel 347 offers exceptional resistance to intergranular attack post-welding and high-temperature creep resistance.
As a trusted stockist, exporter, and Stainless Steel 347 Flanges Supplier In India, Arrow Piping specializes in supplying high-precision metric and imperial flanges designed to handle various operational pressures and aggressive media. Operating from Mumbai, Maharashtra, we stock and supply complete piping flange solutions—including weld neck, slip-on, blind, socket weld, threaded, lap joint, orifice, and custom CNC-machined forged flanges—to EPC contractors, stockists, and industrial clients across the GCC, Europe, Americas, and Asia-Pacific regions.
1. What Are Stainless Steel 347 Flanges & Why Are They Essential?
Stainless Steel 347 Flanges are critical mechanical connection components forged or machined from high-purity SS 347 forged stock or plate material. Unlike standard non-stabilized stainless grades, SS 347 is stabilized with Columbium to prevent chromium carbide precipitation in the sensitization temperature range (800°F to 1500°F / 427°C to 816°C), maintaining exceptional mechanical integrity and corrosion resistance in elevated-temperature environments.
The alloy contains nominal 17–19% Chromium and 9–13% Nickel along with Columbium (at least 10 times the carbon content). These intentional alloying elements impart extraordinary immunity to intergranular carbide precipitation during welding and high-temperature service, as well as resistance to strong oxidizing acids and organic media. When specified as Austenitic Stainless Steel 347 Flanges, these components deliver outstanding structural stability, preventing catastrophic leaks in high-risk thermal piping networks.
2. International Manufacturing Specifications & Equivalent Standards
When procuring from a Stainless Steel 347 Flanges Supplier In India, cross-verifying material specifications ensures complete alignment with project requirements, offshore standards, and international pressure vessel codes:
| Specification Standard | Applicable Product Category & Details |
|---|---|
| ASTM A182 / ASME SA182 | Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges (Weld Neck, Slip-On, Blind Flanges) - Grade F347 |
| ASTM A240 / ASME SA240 | Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and General Applications |
| ASME B16.5 | Pipe Flanges and Flanged Fittings (NPS 1/2 through NPS 24 - Class 150 to 2500) |
| ASME B16.47 Series A & B | Large Diameter Steel Flanges (NPS 26 through NPS 60) |
| UNS Designation | UNS S34700 |
| Werkstoff Designation | W.Nr. 1.4550 |
| EN Standard Name | EN X6CrNiNb18-10 / EN 1092-1 Flanges |
| DIN Standard Equivalent | DIN 2527 (Blind), DIN 2633 (Weld Neck), DIN 2576 (Slip-On) |
| NACE Compliance | NACE MR0175 / ISO 15156 & NACE MR0103 (General Chemical & Refining Service) |
3. Chemical Composition Breakdown of Stainless Steel 347 (UNS S34700)
The outstanding high-temperature corrosion immunity and structural load capabilities of Stainless Steel 347 flanges are governed by its precise chemical formulation:
| Chemical Element | Minimum (%) | Maximum (%) | Metallurgical Role & Engineering Benefit |
|---|---|---|---|
| Chromium (Cr) | 17.00% | 19.00% | Forms a passive surface oxide layer; provides primary resistance to oxidizing environments. |
| Nickel (Ni) | 9.00% | 13.00% | Stabilizes the austenitic crystal structure; enhances ductility and overall corrosion resistance. |
| Columbium + Tantalum (Cb+Ta) | 10 x %C | 1.00% | Binds carbon to prevent chromium carbide precipitation and intergranular corrosion during welding and heat service. |
| Carbon (C) | — | 0.080% | Maintains elevated temperature tensile strength and creep resistance. |
| Manganese (Mn) | — | 2.00% | Improves hot workability and acts as a deoxidizer during steelmaking. |
| Silicon (Si) | — | 0.75% | Enhances oxidation resistance and acts as a deoxidizing agent. |
| Phosphorus (P) | — | 0.045% | Controlled to prevent embrittlement and preserve toughness. |
| Sulfur (S) | — | 0.030% | Strictly limited to maintain hot ductility and optimal weldability. |
4. Mechanical & Physical Property Profile
Engineers specifying flanges for high-temperature pressure vessels and thermal piping systems must verify load-bearing limits. As a trusted Stainless Steel 347 Flanges Supplier In India, Arrow Piping ensures all batches meet or exceed the following mechanical standards:
| Mechanical / Physical Property | Metric Units (SI) | Imperial Units |
|---|---|---|
| Ultimate Tensile Strength (UTS) | 515 MPa (Min) | 75 ksi (Min) |
| 0.2% Proof Yield Strength | 205 MPa (Min) | 30 ksi (Min) |
| Elongation at Break (A5) | 30% (Min) | 30% (Min) |
| Hardness (Brinell / Rockwell B) | 201 HBW Max / 92 HRB Max | 201 HBW Max / 92 HRB Max |
| Charpy V-Notch Impact Energy (Room Temp) | 100 Joules (Avg Min) | 74 ft-lbs (Avg Min) |
| Density | 7.96 g/cm³ | 0.288 lb/in³ |
| Modulus of Elasticity (20°C) | 193 GPa | 28.0 x 10⁶ psi |
| Thermal Conductivity (at 100°C) | 16.3 W/m·K | 113 BTU-in/hr-ft²-°F |
| Electrical Resistivity | 0.72 µΩ·m | 433 ohm·circ mil/ft |
| Melting Point Range | 1400 – 1425 °C | 2550 – 2600 °F |
5. Deep-Dive Comparison: SS 347 vs. SS 304L vs. SS 316L
Selecting the correct flange alloy prevents unexpected high-temperature corrosion failures in process operations. Here is a quick metallurgical evaluation:
1. Stainless Steel 347 (UNS S34700 / 1.4550):
Columbium-stabilized 18/10 austenitic stainless steel. Designed for continuous service in the carbide precipitation temperature range (800°F to 1500°F / 427°C to 816°C) with high creep strength and zero post-weld intergranular corrosion.
2. Stainless Steel 304L (UNS S30403 / 1.4306):
Low-carbon 18/8 austenitic stainless steel with max 0.03% C. Excellent for ambient to moderate temperature post-weld corrosion resistance, but lacks high thermal creep strength compared to SS 347.
3. Stainless Steel 316L (UNS S31603 / 1.4404):
Austenitic stainless steel with 2.0–3.0% Molybdenum. Provides superior resistance to pitting and crevice corrosion in chloride-containing media, but is not specifically optimized for high-temperature stabilization like SS 347.
6. Complete Range of Stainless Steel 347 Flanges Supplied by Arrow Piping
As a full-spectrum Stainless Steel 347 Flanges Supplier In India, we supply and export an extensive catalog of standard, non-standard, and custom flanges strictly per ANSI, ASME, DIN, ISO, BS, and EN standards:
| Flange Category | Available Types & Configurations | Dimensional Standards |
|---|---|---|
| SS 347 Weld Neck Flanges (WNF) | Standard Bore, Extra Heavy Bore, Schedule 10S to SCH 160/XXS, Long Weld Neck (LWN) | ASME B16.5, ASME B16.47, DIN 2633, EN 1092-1 Type 11 |
| SS 347 Slip-On Flanges (SOF) | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Hubbed Slip-On | ASME B16.5, DIN 2576, EN 1092-1 Type 12 |
| SS 347 Blind Flanges (BLRF) | Raised Face Blind, Flat Face Blind, Ring Type Joint Blind (RTJ), Spectacle Blind, Spacers & Paddle Blinds | ASME B16.5, ASME B16.48, DIN 2527, EN 1092-1 Type 05 |
| SS 347 Socket Weld Flanges (SWF) | Raised Face Socket Weld, Flat Face Socket Weld, High-Pressure SW Flanges | ASME B16.5, EN 1092-1 Type 14 |
| SS 347 Threaded Flanges (THDF) | NPT Threaded, BSPT Threaded, Male/Female Threaded Flanges | ASME B16.5, DIN 2566, EN 1092-1 Type 13 |
| SS 347 Lap Joint & Special Flanges | Lap Joint Flanges with Stub Ends, Orifice Flanges, Reducing Flanges, Custom CNC Machined Forged Rings | ASME B16.5, ASME B16.36, Custom Blueprints |
7. Pressure Class Ratings & Flange Facing Types for SS 347 Flanges
Because Stainless Steel 347 retains excellent strength and structural performance across temperature ranges, flanges are supplied across comprehensive ASME pressure classes:
| ASME Pressure Class | DIN / EN Pressure Rating | Primary Flange Facing Types Available | Typical Application Environment |
|---|---|---|---|
| Class 150 | PN 6 / PN 10 / PN 16 | Raised Face (RF), Flat Face (FF) | Exhaust manifolds and low-pressure high-temp gas lines |
| Class 300 | PN 25 / PN 40 | Raised Face (RF), Tongue & Groove (T&G) | Medium-pressure process heater lines, heat exchangers |
| Class 600 | PN 63 / PN 100 | Raised Face (RF), Ring Type Joint (RTJ) | High-pressure chemical processing & superheated steam lines |
| Class 900 | PN 160 | Ring Type Joint (RTJ), Male & Female (M&F) | High-pressure catalytic cracking units |
| Class 1500 | PN 250 | Ring Type Joint (RTJ) | Severe pressure thermal power generation and gas processing |
| Class 2500 | PN 400 | Ring Type Joint (RTJ) Heavy Duty | Ultra-high-pressure specialized power and chemical lines |
*Assembly Note: When installing Stainless Steel 347 flanges in elevated thermal service, ensure appropriate high-temperature gasket selection (such as SS347 spiral wound gaskets with flexible graphite filler and compatible anti-seize bolting) to prevent relaxation and localized leakage.
8. Critical Industrial Applications Worldwide
As a leading Stainless Steel 347 Flanges Supplier In India, Arrow Piping supplies UNS S34700 flanges to high-stress industrial applications across the globe:
a) Petroleum Refining & Petrochemical Plants
Stainless Steel 347 weld neck and slip-on flanges are extensively deployed in fluid catalytic cracking (FCC) units, thermal cracking lines, and high-temperature hydrocarbon processing where sensitization resistance is essential.
b) Power Generation & Radiant Superheaters
Boiler systems, steam power plants, and radiant superheater headers require materials that resist creep and scaling. SS 347 blind and weld neck flanges maintain high structural strength in extreme heat conditions.
c) Aerospace & Aircraft Exhaust Systems
Due to its resistance to cyclic high temperatures and exhaust gas corrosion, SS 347 flanges and forged components are widely specified in aircraft collector rings, exhaust manifolds, and turbine assemblies.
d) Chemical Processing & Heavy Industrial Systems
SS 347 maintains high oxidation and intergranular corrosion resistance in severe chemical service, making these flanges ideal for nitric acid processing and high-temperature chemical reactor piping.
9. Comprehensive Quality Assurance, Testing & Traceability
At Arrow Piping, quality control is central to our supply and export operations. Every batch of Stainless Steel 347 flanges undergoes rigorous testing before dispatch to ensure zero site defects.
Our Rigorous QA/QC Testing Protocol Includes:
- PMI Testing (Positive Material Identification): 100% XRF spectro-analysis on all flange lots to verify chemical elements per ASTM A182 F347.
- Dimensional & Facing Verification: Machining tolerance and flange face serration checks (125-250 AARH finish) per ASME B16.5 / B16.47.
- Non-Destructive Testing (NDT): Ultrasonic Testing (UT) for internal forging defects and Dye Penetrant Inspection (DP) for surface integrity.
- Corrosion Performance Testing: Intergranular corrosion test per ASTM A262 Practice E to verify stabilization post-welding.
- Hydrostatic Pressure Testing: Proof pressure testing of flange bodies to ensure zero leakage under rated pressure limits.
- Mechanical & Tensile Testing: Tensile, yield, and hardness tests carried out per ASTM A182 / ASTM E8 standards.
- Mill Test Certification: Fully compliant EN 10204 3.1 certification accompanied by third-party inspection reports (TUV, DNV, SGS, BV, Lloyds).
10. Weight Estimation & Shipping Weight Formula for SS 347 Flanges
To assist logistics managers and structural piping engineers in estimating freight tonnage, use the accurate mathematical formula below for SS 347 steel flanges:
Formula for Approximate Plate Flange Weight:
Weight (kg) = [ π × (OD² - ID²) × Thickness × Density ] / 4000000
Where:
- OD = Flange Outer Diameter in mm
- ID = Flange Inner Bore Diameter in mm
- Thickness = Flange Total Thickness in mm
- Density = 7.96 g/cm³ (0.00000796 kg/mm³)
Engineering Note: For Weld Neck Flanges, include additional mass allowances for hub taper and raised face height.
11. Factors Influencing Stainless Steel 347 Flanges Price
When requesting quotes from a Stainless Steel 347 Flanges Supplier In India, several key technical factors influence the final unit price:
- Raw Material Market Tonnage: Stainless steel prices fluctuate based on international LME prices of Nickel, Chromium, and Columbium (Niobium).
- Flange Type & Pressure Class: Higher pressure classes (Class 900 to 2500) and complex hub geometries (Weld Neck, Long Weld Neck) require more raw material forging weight and extended machining time.
- Forging vs. Plate Construction: Seamless forged flanges per ASTM A182 vs. cut plate flanges per ASTM A240.
- Inspection & Testing Requirements: Additional third-party witness testing (TUV, DNV, Bureau Veritas) or specialized non-destructive evaluations.
- Export Packaging Standards: Heavy-duty ISPM-15 certified wooden crates with protective end caps.
Why Choose Arrow Piping as Your Stainless Steel 347 Flanges Supplier In India?
Partnering with Arrow Piping as your preferred Stainless Steel 347 Flanges Supplier In India delivers key commercial and engineering advantages:
- Extensive Ready Stock Inventory: Large inventory of standard ASTM A182 F347 weld neck, slip-on, blind, and socket weld flanges for rapid dispatch.
- In-House Precision Machining: Advanced CNC vertical turning lathes (VTL) capable of custom serrations, heavy wall hubs, and special dimensions per customer drawings.
- Complete Export Documentation Support: EN 10204 3.1 MTC, Certificate of Origin (COO), Chamber of Commerce attestation, Bill of Lading, and customized packing lists.
- Seaworthy Protective Packaging: All exported flanges feature plastic flange face protectors, VCI anti-rust wrapping, and are packed securely in wooden cases built for transit.
Looking for a trusted Stainless Steel 347 Flanges Supplier In India? Request an Immediate Quote from Arrow Piping today. Send your detailed bill of materials and technical drawings to our sales desk for competitive pricing and fast delivery.
12. Global Export Destinations & Supply Network
Arrow Piping routinely supplies Stainless Steel 347 flanges from Mumbai, India, to major industrial centers around the world:
- Middle East & GCC Countries: United Arab Emirates (Dubai, Abu Dhabi), Saudi Arabia (Jubail, Yanbu), Qatar (Doha), Kuwait, Oman (Muscat), Bahrain.
- Europe: United Kingdom, Germany, Netherlands (Rotterdam), Italy, Norway (Stavanger), France, Spain.
- Americas: United States (Houston, New Orleans), Canada, Brazil, Mexico, Chile.
- Asia-Pacific & Africa: Singapore, Malaysia, Australia (Perth), South Africa, Nigeria, Vietnam, Indonesia.
Conclusion
Selecting a verified, highly capable Stainless Steel 347 Flanges Supplier In India like Arrow Piping guarantees metallurgical compliance, precise dimensional tolerances, and dependable performance for your most demanding high-temperature projects. With columbium stabilization, high creep strength, and complete international compliance certification, Stainless Steel 347 flanges supplied by Arrow Piping offer ultimate operational reliability.
Contact our engineering sales team today at inquiry@arrowpiping.co.in or explore our complete flanges product line on our Flanges Product Page.