Duplex Steel Flanges Supplier in Mumbai
The Metallurgy and Surface Finish Engineering
The operational lifespan and anti-corrosive performance of a duplex steel flange depend heavily on its precise chemical formulation and the quality of its machined face.
Chemical Composition and Structural Grade Performance
Our manufacturing catalog covers standard Duplex steels alongside advanced Super Duplex alloys. Standard Duplex Grade F51 / F60 (UNS S31803 / S32205) features a precise blend of roughly 22% chromium, 5% nickel, 3% molybdenum, and 0.18% nitrogen. This composition offers twice the mechanical yield strength of standard austenitic stainless steel (like 316L) along with significantly higher resistance to localized pitting. For extremely aggressive environments involving hot hyper-saline brines or strong organic acids, we manufacture Super Duplex flanges from grades like F53 (UNS S32750) and F55 (UNS S32760). These alloys feature higher levels of chromium (25%), molybdenum (4%), and nitrogen, achieving a Pitting Resistance Equivalent Number (PREN) greater than 40.
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 1500# and 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): Features a tapered, high-strength hub that mirrors the pipe's internal wall thickness, moving stress directly into the line. It is ideal for high-pressure, cryogenic, or high-vibration piping networks.
- Slip-On (SORF): Slides easily over the outside diameter of the pipe and is secured with internal and external fillet welds. This style provides straightforward alignment and is widely used in moderate-pressure chemical lines.
- Blind (BLRF): A solid forged disc used to terminate a pipeline path or isolate a system loop, designed to absorb the maximum internal fluid pressure forces.
- Lap Joint / Stub Ends: Paired directly with an independent backing flange. It allows for quick rotational alignment, which simplifies routine maintenance, line cleaning, and inspection schedules in complex chemical manifolds.
- Socket Weld & Threaded: Engineered for small-bore, high-pressure piping networks where internal welding is restricted or impractical.
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 |
| Material Grades |
Duplex F51 (UNS S31803), F60 (UNS S32205) / Super Duplex F53 (UNS S32750), F55 (UNS S32760) |
| Pressure Classes |
Class 150, 300, 600, 900, 1500, 2500 / PN6 to PN250 |
| Facing Types |
Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Tongue & Groove (T&G) |
| Size Range |
1/2” NB to 48” NB (Custom large-diameter and heavy-wall configurations available) |
| Testing Regimens |
Ultrasonic Flaw Detection, PMI Testing, LPT, Ferrite Content Measurement, ASTM G48 Corrosion Test |
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.
Duplex Steel Flanges 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 duplex and super duplex steel flanges to upstream oil and gas projects in the Middle East, chemical manufacturing infrastructure in Europe, and specialized desalination facilities 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
| Duplex Steel 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 250 |
| 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 / Solution Annealed & Precision Machined |
| Testing Protocols |
Hydrostatic, PMI, Ferrite Count, ASTM G48 Pitting, Hardness, Ultrasonic, Liquid Penetrant |
| Certification |
EN 10204 3.1 / 3.2 Mill Test Certificate, NACE MR0175 / ISO 15156 Compliance |
