DIPTI METAL INDUSTRIES
ASTM A182 F51 Duplex Stainless Steel Flanges: Largest Global F51 Manufacturer in Mumbai, India, F51 Supplier & F51 Exporter
Dipti Metal Industries is your premier worldwide ASTM A182 F51 Flange Manufacturer in Mumbai, India, Global A182 F51 Supplier, Dealer, and Top A182 F51 Stockist and Exporter from India. ASTM A182 F51 is a dual-phase (austenitic-ferritic) Duplex stainless steel, specifically engineered to provide extreme structural strength and superior resistance to Stress Corrosion Cracking (SCC) in chloride environments. It is the material of choice for desalination plants, offshore oil platforms, and chemical processing. We manufacture a comprehensive range of F51 Slip On Flanges, F51 Weld Neck Flanges, F51 Blind Flanges, and F51 Ring Type Joint (RTJ) Flanges. Available in sizes 1/2″ to 48″, Classes 150 to 2500. As a leading F51 Flange Manufacturer in Mumbai, we ensure high durability and 100% material traceability for severe corrosive service.
Dipti Metal Industries: Expertise in High-Strength ASTM A182 F51 Duplex Flanges
Dipti Metal Industries stands as the largest global ASTM A182 F51 Manufacturer in Mumbai, India. ASTM A182 F51 (commonly known as Duplex 2205 / UNS S31803) is a metallurgical marvel, combining the best properties of both austenitic and ferritic stainless steels. This dual-phase structure provides our ASTM A182 F51 Forged Flanges with nearly double the yield strength of standard 316L, while simultaneously offering significantly higher resistance to localized corrosion, especially pitting and crevice attack in seawater and high-salinity solutions.
We supply a massive inventory as the top F51 Flange Stockist in India, catering to high-integrity piping systems globally. Our forging process ensures a precise 50/50 phase balance between austenite and ferrite, which is critical for maximizing mechanical toughness. Whether your project requires F51 Slip On (SORF) flanges for structural lightness or high-pressure F51 Weld Neck (WNRF) flanges for offshore subsea manifolds, our Mumbai facility ensures manufacturing as per ASME B16.5 and B16.47 standards. As a leading F51 Exporter from India, we provide full EN 10204 3.1 certification, confirming the 22% Chromium and 3% Molybdenum chemistry required for elite performance.
Need even higher corrosion resistance for extreme deep-sea or high-acid service? Explore our Super Duplex F53 Flanges or for general marine grade, see F316L Flanges.
ASTM A182 F51 Flange Standards & Design Codes
| Specification | Material Grade | Types Available | Pressure Ratings |
|---|---|---|---|
| ASME B16.5 | F51 / UNS S31803 | SORF, WNRF, BLRF, SWRF | Class 150 to 2500 |
| ASME B16.47 | F51 / UNS S31803 | Series A (MSS SP-44) & B | Class 75 to 900 |
| EN 1092-1 | 1.4462 | Type 01, 05, 11, 12, 13 | PN 10 to PN 400 |
| API 6A | F51 Duplex | Wellhead & Christmas Tree | 2000 PSI to 15000 PSI |
| JIS B2220 | SUS 318L | SOP, SOH, BL | 10K to 30K |
F51 Technical Specifications & Material Characteristics
Chemical Composition (F51)
- Chromium (Cr): 21.0 - 23.0%
- Nickel (Ni): 4.5 - 6.5%
- Molybdenum (Mo): 2.5 - 3.5%
- Nitrogen (N): 0.08 - 0.20%
- Carbon (C): 0.030% Max
Mechanical Properties
- Tensile Strength: 620 MPa (Min)
- Yield Strength: 450 MPa (Min)
- Elongation: 25% (Min)
- Hardness (Brinell): 290 Max
- PREN Value: 33 - 35
Industrial Applications of ASTM A182 F51 Duplex Flanges
High yield strength and seawater resistance make Dipti Metal's F51 flanges mandatory for:
- Offshore Oil & Gas Platforms
- Seawater Desalination Plants
- Subsea Piping Systems
- Chemical & Petrochemical Tanks
- Marine Engine Piping Components
- Pulp & Paper Bleaching Equipment
- Waste Heat Recovery Systems
- Nuclear Power Desalination Units
Our Global Reach: Serving Countries Worldwide
DIPTI Metal Industries is a truly global exporter, proudly supplying certified industrial piping materials, fasteners, gaskets, and valves to a vast network of clients across every continent. Our extensive logistics capabilities ensure reliable and on-time delivery to major industrial hubs and ports around the world.
- India: Mumbai, Delhi, Chennai, Kolkata, Bangalore, Hyderabad
- UAE: Dubai, Abu Dhabi, Sharjah, Jebel Ali
- Saudi Arabia: Riyadh, Jeddah, Dammam, Jubail
- Qatar: Doha, Ras Laffan
- Oman: Muscat, Sohar, Salalah
- Kuwait: Kuwait City, Ahmadi
- Bahrain: Manama, Sitra
- Iraq: Baghdad, Basra, Erbil
- Iran: Tehran, Bandar Abbas, Isfahan
- Singapore: Singapore City
- Malaysia: Kuala Lumpur, Port Klang, Johor Bahru
- Indonesia: Jakarta, Surabaya, Balikpapan
- Thailand: Bangkok, Rayong, Laem Chabang
- Vietnam: Ho Chi Minh City, Hanoi, Haiphong
- Philippines: Manila, Cebu, Davao
- China: Shanghai, Beijing, Guangzhou, Tianjin, Qingdao
- Japan: Tokyo, Osaka, Nagoya, Yokohama
- South Korea: Seoul, Busan, Ulsan, Incheon
- Bangladesh: Dhaka, Chittagong
- Sri Lanka: Colombo, Kandy
- Myanmar: Yangon, Mandalay
- Kazakhstan: Nur-Sultan, Almaty, Atyrau
- Uzbekistan: Tashkent, Samarkand
- Turkmenistan: Ashgabat, Turkmenbashi
- Azerbaijan: Baku, Ganja
- Jordan: Amman, Aqaba
- Lebanon: Beirut, Tripoli
- Syria: Damascus, Aleppo (subject to trade regulations)
- Yemen: Sana'a, Aden (subject to trade regulations)
- Mongolia: Ulaanbaatar
- Nepal: Kathmandu
- Cambodia: Phnom Penh
- Laos: Vientiane
- Brunei: Bandar Seri Begawan
- Taiwan: Taipei, Kaohsiung
- Germany: Frankfurt, Hamburg, Munich, Düsseldorf, Berlin
- United Kingdom: London, Aberdeen, Manchester, Glasgow, Liverpool
- Netherlands: Rotterdam, Amsterdam, The Hague
- France: Paris, Marseille, Lyon, Le Havre, Bordeaux
- Italy: Milan, Rome, Genoa, Venice, Naples
- Spain: Madrid, Barcelona, Valencia, Bilbao
- Russia: Moscow, Saint Petersburg, Kazan, Novorossiysk
- Poland: Warsaw, Krakow, Gdansk
- Belgium: Antwerp, Brussels, Ghent
- Sweden: Stockholm, Gothenburg, Malmö
- Norway: Oslo, Bergen, Stavanger, Trondheim
- Finland: Helsinki, Tampere, Turku
- Denmark: Copenhagen, Aarhus, Odense
- Portugal: Lisbon, Porto, Sines
- Greece: Athens, Thessaloniki, Patras
- Turkey: Istanbul, Ankara, Izmir
- Switzerland: Zurich, Geneva, Basel
- Austria: Vienna, Salzburg, Linz
- Ireland: Dublin, Cork
- Czech Republic: Prague, Brno
- Romania: Bucharest, Constanta
- Ukraine: Kyiv, Odesa (subject to current events)
- Hungary: Budapest, Debrecen
- Croatia: Zagreb, Split
- Serbia: Belgrade, Novi Sad
- Bulgaria: Sofia, Varna
- Slovakia: Bratislava, Kosice
- Lithuania: Vilnius, Kaunas
- Latvia: Riga, Liepāja
- Estonia: Tallinn, Tartu
- Slovenia: Ljubljana, Maribor
- Cyprus: Nicosia, Limassol
- Malta: Valletta, Birkirkara
- Iceland: Reykjavik
- Luxembourg: Luxembourg City
- Belarus: Minsk, Gomel (subject to trade regulations)
- Bosnia and Herzegovina: Sarajevo
- North Macedonia: Skopje
- Albania: Tirana, Durres
- Moldova: Chisinau
- Montenegro: Podgorica
- Kosovo: Pristina
- USA: Houston, Los Angeles, New York, Chicago, New Orleans, Philadelphia
- Canada: Calgary, Edmonton, Vancouver, Toronto, Montreal, Halifax
- Mexico: Mexico City, Monterrey, Guadalajara, Veracruz, Ciudad del Carmen
- Panama: Panama City, Colón
- Trinidad & Tobago: Port of Spain, San Fernando
- Costa Rica: San José, Puerto Limón
- Guatemala: Guatemala City, Puerto Quetzal
- Honduras: Tegucigalpa, Puerto Cortés
- Nicaragua: Managua, Corinto
- El Salvador: San Salvador, Acajutla
- Jamaica: Kingston, Montego Bay
- Dominican Republic: Santo Domingo, Santiago
- Cuba: Havana, Santiago de Cuba (subject to trade regulations)
- Bahamas: Nassau, Freeport
- Barbados: Bridgetown
- Puerto Rico: San Juan
- Belize: Belize City
- Brazil: São Paulo, Rio de Janeiro, Salvador, Curitiba, Santos
- Argentina: Buenos Aires, Cordoba, Rosario, Bahia Blanca
- Chile: Santiago, Valparaíso, Concepción, Antofagasta
- Colombia: Bogotá, Medellín, Cartagena, Barranquilla
- Peru: Lima, Callao, Arequipa, Trujillo
- Venezuela: Caracas, Maracaibo, Puerto La Cruz (subject to trade regulations)
- Ecuador: Quito, Guayaquil, Manta
- Bolivia: La Paz, Santa Cruz, Cochabamba
- Uruguay: Montevideo, Salto
- Paraguay: Asunción, Ciudad del Este
- Guyana: Georgetown
- Suriname: Paramaribo
- French Guiana: Cayenne
- South Africa: Johannesburg, Durban, Cape Town, Sasolburg
- Nigeria: Lagos, Port Harcourt, Abuja, Kano
- Egypt: Cairo, Alexandria, Port Said, Suez
- Algeria: Algiers, Oran, Skikda
- Morocco: Casablanca, Rabat, Tangier
- Angola: Luanda, Lobito
- Kenya: Nairobi, Mombasa
- Tanzania: Dar es Salaam, Mwanza
- Ghana: Accra, Tema, Kumasi
- Mozambique: Maputo, Beira
- Cameroon: Douala, Yaoundé
- Libya: Tripoli, Benghazi (subject to current events)
- Tunisia: Tunis, Sfax
- Ethiopia: Addis Ababa, Dire Dawa
- Côte d'Ivoire: Abidjan
- Senegal: Dakar
- Zambia: Lusaka, Ndola
- Zimbabwe: Harare, Bulawayo
- DR Congo: Kinshasa, Lubumbashi
- Sudan: Khartoum, Port Sudan (subject to current events)
- Uganda: Kampala, Entebbe
- Gabon: Libreville, Port-Gentil
- Mauritius: Port Louis
- Reunion: Saint-Denis
- Djibouti: Djibouti City
- Eritrea: Asmara, Massawa
- Somalia: Mogadishu (subject to current events)
- Australia: Sydney, Melbourne, Perth, Brisbane, Adelaide, Darwin
- New Zealand: Auckland, Wellington, Christchurch
- Papua New Guinea: Port Moresby, Lae
- Fiji: Suva, Nadi
- New Caledonia: Nouméa
- Solomon Islands: Honiara
- Vanuatu: Port Vila
- Samoa: Apia
- Tonga: Nukuʻalofa
- Kiribati: South Tarawa
- Micronesia: Palikir
- Marshall Islands: Majuro
- Palau: Ngerulmud
- Tuvalu: Funafuti
- Nauru: Yaren
ASTM A182 F51 Global Customer Ratings
Based on 165 Verified Global Reviews
Strength Integrity
F51 flanges allowed us to reduce piping weight by 30% compared to 316L in our marine system.
Ferrite Testing
Every F51 batch verified for 45-55% ferrite content to ensure peak SCC resistance.
"Supplied high-integrity F51 Duplex weld neck flanges for our offshore platform in Norway. Exceptional structural safety and corrosion performance."
"Best F51 exporter from Mumbai. The Duplex SORF flanges for our subsea project in UK were delivered with impeccable certification and finish."
Why Choose Dipti Metal Industries for F51 Duplex Flanges?
- Largest Global F51 Manufacturer in Mumbai: Massive production capacity and ready-stock of Duplex 2205.
- Dual-Phase Guarantee: Guaranteed 45% - 55% Ferrite content for maximum stress corrosion cracking resistance.
- High Strength Performance: Forged integrity that provides double the yield strength of austenitic grades.
- Marine Grade Expertise: Guaranteed PREN of 33+ for superior pitting resistance in saline environments.
- Certified Project Partner: Mill Test Reports as per EN 10204 3.1 and Third Party Inspection (TPI) support provided.
Request a Quote for ASTM A182 F51 Duplex Flanges
Contact the expert Duplex Stainless Steel Flange Manufacturer in Mumbai today for competitive project pricing and technical support.
F51 Duplex Flanges — Frequently Asked Questions
ASTM A182 F51 and F60 are both Duplex 2205 grades. However, F60 (UNS S32205) is a restricted chemical composition version of F51 (UNS S31803) with higher Chromium, Molybdenum, and Nitrogen content, providing even better corrosion resistance and a higher PREN.
No, Duplex F51 is not recommended for continuous use at temperatures above 315°C (600°F). Prolonged exposure to heat causes embrittlement (475°C embrittlement), which significantly reduces toughness and corrosion resistance. For high heat, austenitic grades like F316H or F347 are preferred.
Pitting Resistance Equivalent Number (PREN) is a formula: %Cr + 3.3x%Mo + 16x%N. Due to the high levels of Chromium (22%), Molybdenum (3%), and Nitrogen (0.15%), F51 has a PREN of 33-35, compared to ~24 for standard 316L, making it much more resistant to pitting in seawater.
Contact Dipti Metal Industries — Your F51 Duplex Flange Manufacturer
Duplex export specialists: Mill-certified F51 components • Ferrite testing verified • Global export documentation. We are a premier manufacturer in Mumbai, India.