Stainless Steel Flanges
Grevinox Overseas is a leading manufacturer, stockist, and domestic supplier of industrial Stainless Steel Flanges in India. Conforming to international standards like ASTM A182 / ASME SA182 and dimensional standards like ASME B16.5 / B16.47, we offer high-precision flanges in forged and plate conditions. Our range includes SORF, WNRF, BLRF, SWRF, Lap Joint, Threaded, and Spectacle flanges in pressure ratings from 150# up to 2500#, engineered for perfect sealing under high-pressure piping assemblies.
SS Flanges Specifications
We supply stainless steel flanges in a wide spectrum of dimensional standards, pressure ratings, and face styles for leak-proof piping networks.
| Parameters | Specifications |
|---|---|
| Standard Specifications | ASTM A182, ASME SA182, EN 1092-1, JIS B2220, DIN specifications |
| Dimensional Standards | ASME/ANSI B16.5, B16.47 Series A & B, B16.48, MSS SP-44, API 605 |
| Size Range | 1/2" NB to 48" NB (Nominal Bore) |
| Pressure Ratings (Class) | 150#, 300#, 400#, 600#, 900#, 1500#, 2500# (PN6, PN10, PN16, PN25, PN40, PN64, PN100) |
| Flange Types | Slip On (SORF), Weld Neck (WNRF), Blind (BLRF), Socket Weld (SWRF), Lap Joint, Threaded (Screwed), Spectacle Blind, Ring Type Joint (RTJ), Custom Forged Flanges |
| Face Types | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Male & Female (M&F), Tongue & Groove (T&G) |
| Value Added Services | CNC Custom Machining, custom drilling, thread tapping (NPT/BSP), heat treatment, stamp engraving |
Stainless Steel Material Grades & Features
We supply forged and plate flanges in standard austenitic, corrosion-resistant duplex, and specialized high-temperature steel alloys.
| Grade Family | Common Grades | Key Features & Applications |
|---|---|---|
| Austenitic (Standard) | SS 304 / 304L, SS 316 / 316L | High tensile strength and durability, exceptional general-purpose chemical resistance. Best for general processing piping. |
| High Temperature | SS 321, SS 347, SS 310S | Resists carbide precipitation during high-temperature exposures. Used extensively in steam lines, flare pipes, and boiler connections. |
| Super Austenitic | SS 904L, UNS S31254 (254 SMO) | Outstanding resistance to localized pitting and crevice corrosion in hot acids and chlorides. Used in marine piping and flue gas systems. |
| Duplex & Super Duplex | Duplex 2205 (S31803/S32205), Super Duplex 2507 (S32750) | Extremely high structural strength with superb stress corrosion cracking resistance. Ideal for offshore drilling and subsea piping. |
ASME B16.5 Class 150 Flanges Dimension Chart
Refer to our rating chart for standard ASME B16.5 Class 150 Flanges (in mm) to plan bolt layouts and overall sizing calculations:
| Nominal Size (NB) | Flange Outer Dia (OD) | Flange Thickness (C) | Bolt Circle Dia (B) | No. of Bolt Holes | Dia of Bolt Holes (mm) |
|---|---|---|---|---|---|
| 1/2" NB | 90 mm | 11.5 mm | 60.3 mm | 4 | 15.9 mm |
| 3/4" NB | 100 mm | 13.0 mm | 69.9 mm | 4 | 15.9 mm |
| 1" NB | 110 mm | 14.5 mm | 79.4 mm | 4 | 15.9 mm |
| 1-1/4" NB | 115 mm | 16.0 mm | 88.9 mm | 4 | 15.9 mm |
| 1-1/2" NB | 125 mm | 17.5 mm | 98.4 mm | 4 | 15.9 mm |
| 2" NB | 150 mm | 19.5 mm | 120.7 mm | 4 | 19.0 mm |
| 2-1/2" NB | 180 mm | 22.5 mm | 139.7 mm | 4 | 19.0 mm |
| 3" NB | 190 mm | 24.0 mm | 152.4 mm | 4 | 19.0 mm |
| 4" NB | 230 mm | 24.0 mm | 190.5 mm | 8 | 19.0 mm |
| 6" NB | 280 mm | 25.5 mm | 241.3 mm | 8 | 22.2 mm |
| 8" NB | 345 mm | 29.0 mm | 298.5 mm | 8 | 22.2 mm |
| 10" NB | 405 mm | 30.5 mm | 362.0 mm | 12 | 25.4 mm |
Quality Assurance & Flange Testing
To guarantee leak-proof performance under severe thermal and pressure variations, all forged flanges undergo precise metallurgical checking. Mill Test Certificates (MTC) according to EN 10204 3.1 are supplied. Testing includes:
- Ultrasonic Testing (UT): Scans the forged raw material to confirm zero internal cracks, voids, or inclusions.
- Positive Material Identification (PMI): Spectro testing to verify the exact chemical percentage of alloying elements.
- Dimensional and Tolerance Checking: Ensures raised face heights, bolt hole circle diameters (PCD), and flange thicknesses match exact standards.
- Hardness & Tensile Testing: Verifies yielding limits, elongation, and structural hardness levels.
- Granular Attack Testing: Intergranular Corrosion Test (IGC) to check resistance to grain boundaries oxidation.
- Third-Party Inspections (TPI): We welcome inspection audits by agencies such as TUV, DNV, SGS, Bureau Veritas, and Lloyds.
Industrial Applications
Our stainless steel flanges are widely used for connecting pipelines, valves, pumps, and other equipment in fluid processing systems:
- Oil, Gas & Refineries: Pipeline connections, offshore platforms, and hydrocarbon processing lines.
- Chemical Processing: Transport pipelines for corrosive acids, aggressive chemicals, and gases.
- Power Generation & Heat Exchangers: High-pressure steam pipe loops and condenser inlet lines.
- Marine & Water Desalination: Piping loops handling brackish water and seawater loop connections.
- Pharmaceuticals & Biotech: High-purity sanitary connections in processing plants.
Domestic Supply Network & Cities Served
Grevinox Overseas is a trusted domestic supplier and distributor of high-quality Stainless Steel Flanges across India. We deliver top-grade piping materials to all major industrial zones, manufacturing hubs, and cities including:
West & South India
- Mumbai, Pune, Nagpur (MH)
- Thane, Nashik, Aurangabad (MH)
- Ahmedabad, Surat, Vadodara (GJ)
- Rajkot, Jamnagar, Vapi (GJ)
- Bengaluru, Mangaluru, Mysuru (KA)
- Chennai, Coimbatore, Madurai (TN)
- Hyderabad, Warangal (TS)
- Visakhapatnam, Vijayawada (AP)
- Kochi, Kozhikode (KL)
- Vasco da Gama, Panaji (GA)
North, East & Central India
- New Delhi, Noida, Gurugram
- Ghaziabad, Faridabad, Sonipat
- Ludhiana, Jalandhar, Amritsar (PB)
- Kanpur, Lucknow, Agra (UP)
- Indore, Bhopal, Jabalpur (MP)
- Raipur, Bhilai, Bilaspur (CG)
- Kolkata, Howrah, Durgapur (WB)
- Jamshedpur, Ranchi, Dhanbad (JH)
- Bhubaneswar, Cuttack, Rourkela (OD)
- Guwahati, Dibrugarh (AS)
Prompt Delivery & Supply Chain
We partner with leading transport and cargo services in India to ensure prompt dispatch, safe transit, and timely delivery of your orders directly to your factory, warehouse, or project site with proper documentation (MTC, GST Invoice, Lorry Receipt).