Stainless Steel 904L Flange Supplier in Mumbai
The Metallurgy and Sealing Face Engineering
The industrial operational lifespan of a heavy-duty stainless steel 904L flange is determined by its specific metallurgical composition and the precision of its sealing face machining.
Advanced Chemistry and Physical Properties
The addition of 4.5% molybdenum significantly strengthens the material's resistance to localized pitting and crevice corrosion in seawater and chlorinated water systems compared to standard grades. Concurrently, the rich copper content provides superior performance in phosphoric, acetic, and citric acid lines. Mechanically, our 904L forged flanges deliver a minimum yield strength of 220 MPa and a minimum tensile strength of 490 MPa, retaining outstanding mechanical toughness even at cryogenic or high-temperature processing thresholds up to 400°C.
Precision Machining and Gasket Seating
Equally critical is the dimensional machining of the sealing face. When tightening a flanged connection, the mating surfaces must compress the gasket with complete uniformity. Our specialized CNC turning centers machine precise phonographic or concentric serrations into the Raised Face (RF) or Flat Face (FF) profiles, maintaining a strict 125–250 micro-inch AARH (Arithmetic Average Roughness Height) surface finish. This targeted roughness forces the gasket material to cold-flow directly into the micro-grooves, creating an impenetrable, leak-proof barrier capable of containing Class 150# to Class 2500# process streams.
Primary 904L Flange Body Configurations
Depending on the pipeline geometry, velocity requirements, and operational maintenance schedules, we manufacture a complete line of body styles:
- Weld Neck (WNRF): Designed with a long, tapered structural hub that mirrors the pipe's internal schedule, shifting mechanical stress directly into the line. It is ideal for high-pressure, high-vibration, or extreme-temperature processing manifolds.
- Slip-On (SORF): Slides easily over the outside diameter of the pipe and is secured with dual internal and external structural fillet welds, making it highly cost-effective and straightforward to align in moderate-pressure loops.
- Blind Flange (BLRF): A solid forged disc with no center bore used to terminate a pipeline segment or isolate a pressure vessel path, designed to absorb maximum hydrodynamic shock waves.
- Socket Weld & Threaded: Engineered for small-bore, high-pressure piping networks where internal space limits welding options or where field welding poses safety risks.
Dimensional and Material Specifications
Our production engineering strictly follows global dimensional codes to ensure hassle-free integration with global piping infrastructure.
| Parameter |
Specification Details |
| Design Standards |
ASME B16.5, ASME B16.47 (Series A & B), DIN, EN 1092-1, BS 4504, JIS B2220 |
| Material Specification |
ASTM A182 / ASME SA182 F904L, ASTM B649 UNS N08904, WNR 1.4539 |
| Pressure Classes |
Class 150, 300, 600, 900, 1500, 2500 LBS / PN6 to PN64 |
| Facing Types |
Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Size Range |
1/2” NB up to 48” NB (Custom large-diameter and heavy-wall forgings available) |
| Testing Regimens |
Ultrasonic Flaw Detection, PMI Analysis, LPT, Mechanical Yield & Tensile Testing, Hardness |
Driving B2B Procurement via an Authorized Flanges Dealer in Mumbai
For global engineering, procurement, and construction (EPC) firms managing large-scale industrial projects, handling thousands of pipeline connections is a complex logistical task. Partnering with a dedicated distribution channel in Mumbai gives you a distinct operational edge.
We provide volume-based commercial discounts, comprehensive material traceability certifications (MTC EN 10204 3.1/3.2), and durable, sea-worthy packaging designed to prevent edge dents or surface scratches during transport. Additionally, our sales engineers provide direct technical support to procurement teams, verifying bolt-circle dimensions, pressure-temperature ratings, and wall-thickness compatibility to match project isometric data perfectly.
Stainless Steel 904L Flange Exporter in Mumbai
Fulfilling Global Contracts as a Top Flanges Exporter from Mumbai
Our focus on precision machining and zero-defect forging has earned strong international trust. Operating from the export hub of Mumbai, we regularly ship high-reliability super-austenitic 904L flanges to seawater desalination complexes in the Middle East, chemical plant infrastructure developments in Europe, and offshore oil processing manifolds across Southeast Asia.
Every export order passes through a strict final quality checkpoint, including full dimensional analysis, face thickness validation, and 100% PMI validation. We package shipments in heavy-duty, export-grade wooden cases equipped with moisture-resistant barriers and tailored face protectors. This ensures your components arrive at the project site ready for immediate installation.
Technical Specifications Summary
| 904L Flanges – Technical Specifications |
Details |
| Size Range |
1/2" to 48" (DN 15 to DN 1200) |
| Pressure Class |
150 / 300 / 600 / 900 / 1500 / 2500 LBS, PN 6 to PN 64 |
| Type |
Weld Neck, Slip On, Socket Weld, Blind, Lap Joint, Threaded, Reducing, Orifice, Spectacle Blind |
| Face Type |
RF, FF, RTJ |
| Manufacturing Process |
100% Forged / Solution Annealed & Precision CNC Machined |
| Testing Protocols |
Hydrostatic, PMI, Hardness, Volumetric Ultrasonic Check, Liquid Penetrant |
| Certification |
EN 10204 3.1 / 3.2 Mill Test Certificate, Compliance with NACE MR0175 / ISO 15156 Sour Service |
