Stainless Steel 304 Flange Supplier in Mumbai
The Metallurgy and Surface Finish Engineering
The industrial operational lifespan of a heavy-duty SS 304 flange is determined by its specific metallurgical composition and the precision of its sealing face machining.
Chemical Composition and Corrosion Resistance
Stainless Steel Grade 304 (UNS S30400) relies on a precise, balanced ratio of Chromium (minimum 18%) and Nickel (minimum 8%). This specific composition allows the flange to instantaneously form an inert, self-healing chromium oxide passive layer upon exposure to the atmosphere. This layer renders it highly resistant to atmospheric corrosion, oxidizing environments, and organic chemical compounds. For configurations requiring extensive field welding, we utilize the 304L variant (UNS S30403). The low carbon content (maximum 0.03%) prevents harmful chromium carbide precipitation along the heat-affected zone (HAZ) during welding, eliminating intergranular cracking risks.
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 Flange Configurations
Depending on the system's velocity, internal pressure spikes, and general pipeline routing, we manufacture a complete selection of body styles:
- Weld Neck (WNRF): Engineered with a long, tapered hub that mirrors the pipe's wall thickness. It shifts stress directly into the line, making it suitable for high-pressure, high-vibration, and extreme-temperature piping systems.
- Slip-On (SORF): Slides over the outside diameter of the pipe and is secured with internal and external fillet welds. This style provides easier alignment and is ideal for moderate or low-pressure utility networks.
- Blind (BLRF): A solid forged disc used to close off a pipeline section or isolate equipment. It is designed to handle the highest internal pressure loads across the network.
- Lap Joint: Paired directly with a machined stub end. It allows for quick rotational alignment, which simplifies routine maintenance, line cleaning, and inspection schedules.
- Socket Weld & Threaded: Ideal for small-bore piping where internal space limits welding options or where 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 Grades |
ASTM A182 F304, F304L, F304H; ASTM A240 Grade 304, 304L |
| Pressure Classes |
Class 150, 300, 600, 900, 1500, 2500 / PN6 to PN100 |
| Facing Types |
Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Tongue & Groove (T&G) |
| Size Range |
1/2” NB to 60” NB (Custom large-diameter forgings available) |
| Testing Regimens |
Ultrasonic Flaw Detection, PMI Testing, LPT, IGC Corrosion Testing, Hydrostatic Testing |
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 304 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 SS 304 flanges to food and beverage processing plants in Europe, HVAC infrastructure developments in the Middle East, and municipal utility setups across Southeast Asia.
Every export order passes through a strict final quality checkpoint, including full dimensional analysis, 100% PMI validation, and ultrasonic testing. 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
| SS 304 Flanges – Technical Specifications |
Details |
| Size Range |
1/2" to 60" (DN 15 to DN 1500) |
| Pressure Class |
150 / 300 / 600 / 900 / 1500 / 2500 LBS, PN 6 to PN 100 |
| Type |
Weld Neck, Slip On, Socket Weld, Blind, Lap Joint, Threaded, Reducing, Orifice, Spectacle Blind |
| Face Type |
RF, FF, RTJ, T&G, Male & Female |
| Manufacturing Process |
Hot Forged / Precision Machine Finished |
| Testing Protocols |
Hydrostatic, PMI, Hardness, IGC, Ultrasonic, Liquid Penetrant |
| Certification |
EN 10204 3.1 / 3.2 Mill Test Certificate, Compliance with Global Standards |
