Dipti Metal Industries offers robust, durable, low-temperature ASTM A350LF3 Class1 forged steel flanges and pipe fittings for severe service and critical applications. We provide a comprehensive range including Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint, Long Weld Neck, Reducing, Orifice, and Spectacle Blinds. Our B16.11 forged pipe fittings encompass elbows, tees, crosses, couplings, unions, nipples, reducers, caps, plugs, bushings, inserts, and outlets. Available in sizes from 1/2″–48″, with pressure ratings from PN6–PN40 and ASME Class 150–900 (Class 1500+ on request). We specialize in OEM machining, precision fabrication, custom dimensions, and various protective coatings to ensure leak-proof, long-life, and maintenance-free connections, meeting the highest standards of structural integrity and engineering excellence.
Dipti Metal Industries is a leading manufacturer, reliable supplier, and global exporter of ASTM A350LF3 Class1 low temperature carbon steel forged flanges and high-quality forged pipe fittings under our trusted Dipti® brand. Strategically based in Mumbai, India, we are committed to supporting EPC contractors, OEMs, project distributors, and stockists across 60+ countries worldwide. Our extensive inventory and made-to-order (MTO) production capabilities ensure rapid delivery and competitive pricing for critical infrastructure projects within the pipeline, oil and gas, refinery, petrochemical, LNG, power generation, water treatment, and marine segments. We pride ourselves on delivering certified, traceable products with superior customer support, technical assistance, and professional project management, upholding our reputation as a reputable Indian manufacturer and global steel product supplier.
ASTM A350LF3 Class1 is a specialized low temperature carbon steel forging grade essential for robust pipeline flanges and forged fittings, specifically designed for applications demanding excellent notch toughness and uncompromising reliability in extremely cold environments. This material, with higher nickel content, is ideal for severe service and critical infrastructure where resistance to brittle fracture at very low temperatures is paramount. Dipti Metal Industries ensures that all A350LF3 Class1 forged steel products are manufactured in strict compliance with international standards, including ASME B16.5, ASME B16.47 Series A/B, MSS SP-44, and EN 1092-1 for flanges, and ASME B16.11 for socket weld and threaded forged pipe fittings. Our commitment to metallurgy and quality control guarantees excellent weldability, fatigue resistance, and overall structural integrity for upstream, midstream, and downstream oil & gas sectors, gas transmission, and fluid conveyance systems operating in extreme sub-zero conditions.
Our ASTM A350LF3 Class1 forgings adhere to stringent material specifications and metallurgy. The material exhibits a fine-grained structure, providing superior mechanical properties crucial for pipeline integrity in low-temperature environments. Each batch undergoes rigorous chemical analysis and mechanical testing, including Charpy impact tests, to ensure conformity to international standards and project-specific requirements, including raw material sourcing and heat treatment processes.
| Property 1 (KSI) | 70-95 |
|---|---|
| Property 1 (MPa) | 485-655 |
| Property 2 (KSI) | 38 |
| Property 2 (MPa) | 260 |
| Hardness (HB) | 137-197 |
| Min Impact Temp (°C) | -101 |
| Min Impact Energy (J) | 20 |
| Heat Treatment | N |
Our A350LF3 Class1 carbon steel is carefully alloyed to achieve the desired properties for low-temperature service. Values are indicative and may vary slightly within specified ASTM A350 ranges, ensuring optimal elemental composition for critical service applications. We provide full chemical analysis reports with our Material Test Certificates (MTC).
| Carbon (C) | 0,20 | Manganese (Mn) | 0,90 |
|---|---|---|---|
| Silicon (Si) | 0,20-0,35 | Phosphorus (P) | 0,035 |
| Sulfur (S) | 0,040 | Nickel (Ni) | 3,3-3,7 |
| Chromium (Cr) | 0,12 | Molybdenum (Mo) | 0,02 |
| Other Element 1 (V) | 0,03 | Other Element 2 (Nb) | 0,40 |
| Other Element 3 (Cu) | (empty) | Other Element 4 (N) | (empty) |
Note: Values are indicative; customers should verify against the latest ASTM A350/ASME/EN codes and specific purchase specifications. Additional elements may be present in trace amounts, confirming the steel composition and raw material quality.
All our forged steel flanges are manufactured to exact dimensional accuracy for optimal performance. Facing options include RF, FF, and RTJ for various gasket types like spiral wound gaskets, kammprofile gaskets, and RTJ metal rings. Pressure ratings range from PN6–PN40 and ASME Class 150–900, covering sizes from 1/2″–48″. Serration finish per MSS SP-6 ensures proper gasket seating, with precise bolt drilling patterns adhering to EN/ASME standards for reliable flange integrity.
| Flange Type | Aliases & Standards | Application & Benefits | Technical Notes & Use Cases |
|---|---|---|---|
| Weld Neck (WN) Flange | EN Type 11; ASME WN; Long Hub Flange | Ideal for high-pressure, high-temperature, and cyclic applications in critical process piping and transmission pipelines, ensuring structural integrity and butt-weld connections. | Provides uniform stress distribution; suitable for X-ray inspection; available in RF/RTJ facing for superior leak prevention in heavy-duty service. |
| Slip-On (SO) Flange | SORF / SOFF; EN Type 01/12; Slip-Over Flange | A cost-effective solution for general service, offering ease of alignment and installation. Used in low-to-medium pressure applications where a double fillet weld is sufficient. | Common with stock bores; provides good sealing in moderate service conditions; popular for quick assembly in less critical systems. |
| Blind (BL) Flange | BLRF / BLRTJ; EN Type 05; Blanking Flange | Used for terminating pipe ends, pressure vessel openings, or for inspection purposes. Essential for positive isolation and system closure during maintenance or future expansion. | Can be supplied with tapped holes or bleed rings on request; critical for safety isolation and line blanking operations. |
| Socket Weld (SW) Flange | ASME SWRF; Socket Type Flange | Preferred for small-bore piping systems with medium pressure and temperature, where high strength and permanent connections are required, minimizing leak potential. | Requires a thermal gap per industry practice; offers excellent internal sealing; often used in chemical processing and hydraulic systems. |
| Threaded (THD) Flange | NPT/BSPT/BSPP Flange; Screwed Flange | Utilized in applications where welding is impractical or prohibited, such as highly explosive areas or for instrument connections. Provides a quick, non-welded connection. | Sealing often enhanced with sealant/PTFE tape; suitable for low-pressure, small-diameter lines and temporary setups; easy assembly and disassembly. |
| Lap Joint (LJ) Flange | Backing Flange; Van Stone Flange | Designed for use with lap joint stub ends, especially in lined piping systems or applications requiring frequent dismantling. Allows for easy alignment of bolt holes. | The flange itself doesn't contact the process fluid; offers flexibility in bolt-hole alignment, reducing installation time. |
| Long Weld Neck (LWN) Flange | Integral Neck Flange; Vessel Flange | Primarily used for vessel nozzles, columns, or applications requiring integral reinforcement and custom extensions. Provides a long, smooth transition to the pipe or vessel. | Available with custom length and bore dimensions; often used with special facings for specific sealing requirements. |
| Reducing / Orifice Flange | ASME B16.36 Orifice Flange; Reducing WN/SO/THD | Essential for flow metering applications, differential pressure measurement, and managing flow control. Also used for changing pipe sizes within a system. | Orifice flanges are supplied with jack screws and instrument tapping points; concentric and eccentric reducers are common. RTJ grooves optional for enhanced sealing. |
| Spectacle Blinds | ASME B16.48; Spade & Spacer Set; Paddle Blank | Provides positive isolation for maintenance, repair operations, or process changeovers. Ensures maximum safety by completely blocking fluid flow. | Supplied as full bore paddle spacers and blank paddle blanks; often used in critical process lines for absolute shut-off; bleed rings available. |
Our comprehensive range of ASTM A350LF3 Class1 forged pipe fittings are engineered for durability and leak prevention in high-pressure and critical systems, especially in extremely low-temperature service. Available in Classes 2000#, 3000#, 6000#, and selected 9000# items, these fittings offer robust connections. We provide various threading options including ASME B1.20.1 NPT, ISO 7-1 BSPT, and ISO 228 BSPP, covering sizes from 1/8″–4″ (DN 6–100). All fittings are manufactured from ASTM A350LF3 Class1 low temperature carbon steel, ensuring material traceability and superior mechanical properties for reliable fluid conveyance and structural integrity.
Our manufacturing process involves closed-die forging and upset forging for optimal grain structure and strength. Fittings undergo precise heat treatment as per service conditions, followed by meticulous CNC machining, thread gauging, and 100% visual inspection. Non-destructive testing (NDT) is performed as ordered, and products receive rust preventative oil (RPO) or VCI protection before palletized export packing for worldwide shipping and supply chain efficiency.
Our forged flanges conform to global dimensional and pressure-temperature standards, ensuring compatibility across various international projects. We also adhere to specific gasket surface requirements and bolt patterns.
Dipti Metal Industries' forged pipe fittings meet rigorous dimensional and threading standards for secure and leak-free connections in process piping.
Our ASTM A350LF3 Class1 material is a low temperature carbon steel forging grade known for its enhanced toughness at very low temperatures, suitable for pipeline and high-pressure service in extremely cold climates. We ensure full raw material certifications and material traceability.
Note: Equivalents are indicative; it is crucial to match specific mechanical properties and chemical compositions per the definitive order requirements and project specifications.
Our extensive supply capabilities cater to both large diameter pipeline flanges and small bore industrial fittings, meeting diverse project demands.
To ensure longevity and corrosion control, our products are offered with various surface protection and anti-corrosion coating options suitable for diverse environmental conditions.
We provide a comprehensive documentation package and conduct thorough quality control inspections to ensure product integrity and traceability for every shipment.
Dipti Metal Industries' ASTM A350LF3 Class1 forged flanges and fittings are crucial components for a wide array of demanding industrial applications, ensuring reliable performance in critical fluid conveyance and pressure containment systems operating in extremely low temperatures.
Dipti Metal Industries proudly supplies ASTM A350LF3 Class1 forged flanges and forged fittings to a vast global network, catering to industrial hubs and project sites worldwide. Our reliable logistics and supply chain management ensure timely delivery to: India (Mumbai, Delhi, Chennai, Bengaluru, Hyderabad, Ahmedabad, Pune, Kolkata, Surat, Vadodara, Nashik, Visakhapatnam, Kochi, Bhubaneswar, Chandigarh, Jaipur, Lucknow, Bhopal, Patna, Ranchi, Raipur, Guwahati, Nagpur, Coimbatore, Madurai, Tiruchirappalli, Vijayawada, Guntur), United Arab Emirates (Dubai, Abu Dhabi, Sharjah, Fujairah, Ras Al Khaimah), Saudi Arabia (Riyadh, Jeddah, Dammam, Jubail, Yanbu, Khobar), Qatar (Doha, Mesaieed, Ras Laffan), Oman (Muscat, Sohar, Duqm, Salalah), Bahrain (Manama, Sitra), Kuwait (Kuwait City, Ahmadi, Mina Abdullah), Iraq (Basra, Baghdad, Erbil, Kirkuk), Turkey (Istanbul, Ankara, Izmir, Adana, Bursa, Gaziantep), Israel (Haifa, Ashdod, Tel Aviv), Jordan (Amman, Aqaba, Zarqa), Egypt (Cairo, Alexandria, Suez, Port Said, Damietta), South Africa (Johannesburg, Durban, Cape Town, Richards Bay, Port Elizabeth), Kenya (Nairobi, Mombasa, Kisumu), Nigeria (Lagos, Port Harcourt, Abuja, Warri), Ghana (Accra, Tema, Takoradi), Ethiopia (Addis Ababa), Tanzania (Dar es Salaam, Mwanza), Uganda (Kampala), Morocco (Casablanca, Tangier, Rabat), Tunisia (Tunis, Sfax), Algeria (Algiers, Oran, Hassi Messaoud), Libya (Tripoli, Benghazi), United States (Houston, Dallas, Chicago, Los Angeles, New York, New Orleans, Philadelphia, Atlanta, Seattle, San Francisco, Miami, Denver, Boston, Detroit, Phoenix), Canada (Toronto, Calgary, Edmonton, Vancouver, Montreal, Ottawa, Quebec City, Winnipeg, Halifax), Mexico (Monterrey, Mexico City, Guadalajara, Veracruz), Brazil (Rio de Janeiro, São Paulo, Salvador, Recife, Fortaleza, Belo Horizonte, Curitiba, Manaus), Argentina (Buenos Aires, Rosario, Córdoba), Chile (Santiago, Valparaíso), Peru (Lima, Callao), Colombia (Bogotá, Cartagena, Barranquilla, Medellín), Ecuador (Guayaquil, Quito), Uruguay (Montevideo), Paraguay (Asunción), Bolivia (Santa Cruz), United Kingdom (London, Aberdeen, Manchester, Glasgow, Birmingham, Liverpool, Bristol, Newcastle), Ireland (Dublin, Cork), Germany (Hamburg, Essen, Frankfurt, Munich, Berlin, Cologne, Stuttgart, Düsseldorf), France (Paris, Marseille, Lyon, Toulouse, Nice, Nantes, Bordeaux), Spain (Madrid, Barcelona, Bilbao, Valencia, Seville), Portugal (Lisbon, Porto), Italy (Milan, Genoa, Rome, Naples, Turin, Bologna, Florence), Netherlands (Rotterdam, Amsterdam, The Hague), Belgium (Antwerp, Brussels, Ghent), Luxembourg (Luxembourg City), Switzerland (Zurich, Geneva, Bern), Austria (Vienna, Graz), Poland (Gdańsk, Warsaw, Krakow, Wrocław), Czechia (Prague, Brno), Slovakia (Bratislava, Košice), Hungary (Budapest), Slovenia (Ljubljana), Croatia (Rijeka, Split, Zagreb), Serbia (Belgrade, Novi Sad), Romania (Constanța, Bucharest, Timișoara), Bulgaria (Varna, Sofia, Burgas), Greece (Athens, Thessaloniki, Piraeus), Norway (Stavanger, Bergen, Oslo, Trondheim), Sweden (Stockholm, Gothenburg, Malmö), Finland (Helsinki, Tampere), Denmark (Copenhagen, Esbjerg, Aarhus), Iceland (Reykjavík), Ukraine (Odesa, Kyiv), Moldova (Chișinău), Russia (Moscow, St. Petersburg, Kazan, Sochi, Vladivostok, Rostov-on-Don), Kazakhstan (Atyrau, Almaty, Astana), Uzbekistan (Tashkent), Azerbaijan (Baku), Armenia (Yerevan), Georgia (Batumi, Tbilisi), China (Shanghai, Tianjin, Shenzhen, Guangzhou, Beijing, Chongqing, Chengdu, Wuhan, Dalian), Hong Kong, Taiwan (Kaohsiung, Taipei), Japan (Tokyo, Yokohama, Osaka, Nagoya, Kobe), South Korea (Ulsan, Busan, Seoul, Incheon), Singapore, Malaysia (Kuala Lumpur, Johor Bahru, Port Klang), Thailand (Bangkok, Map Ta Phut, Laem Chabang), Vietnam (Ho Chi Minh City, Haiphong, Hanoi), Indonesia (Jakarta, Surabaya, Batam, Medan), Philippines (Manila, Cebu, Davao), Myanmar (Yangon, Mandalay), Cambodia (Phnom Penh), Laos (Vientiane), Sri Lanka (Colombo, Kandy), Bangladesh (Chattogram, Dhaka, Khulna), Nepal (Birgunj, Kathmandu), Bhutan (Phuentsholing), Maldives (Malé), Australia (Perth, Melbourne, Sydney, Brisbane, Adelaide), New Zealand (Auckland, Wellington), and numerous other industrial hubs, ports, and project sites globally, ensuring expedited manufacturing and critical delivery schedules for our clients.
Dipti Metal Industries is dedicated to delivering ASTM A350LF3 Class1 forged flanges and forged fittings with unparalleled quality control and meticulous manufacturing processes. Our approach begins with rigorous billet selection, ensuring raw material integrity and full heat traceability. We employ advanced closed-die forging and upset forging techniques to achieve optimal grain structure and mechanical properties. This is followed by precise normalizing or other specified heat treatment processes, including tempering and stress relieving, to enhance the material’s toughness and dimensional stability for extreme low-temperature service. Each product undergoes state-of-the-art CNC machining, guaranteeing precise dimensions for RF, FF, and RTJ faces, along with adherence to MSS SP-6 serration finish requirements. Bolt-hole drilling is executed to exacting ASME/EN tables, and comprehensive dimensional inspection verifies OD, thickness, PCD, H-Dia, and RF height for absolute accuracy.
Our A350LF3 Class1 pipeline flanges supply includes all types: Weld Neck (WN) for critical butt-weld connections, Slip-On (SO/SORF/SOFF) for ease of installation, Blind (BL/BLRF/BLRTJ) for system closure and blanking, Socket Weld (SW/SWRF) for permanent small-bore connections, Threaded (THD NPT/BSPT/BSPP) for non-welded applications, Lap Joint (LJ) with accompanying stub ends for flexibility, Long Weld Neck (LWN) for vessel integration, Reducing flanges for size transitions, Orifice flanges (ASME B16.36) complete with taps and jack screws for flow measurement, and Spectacle Blinds (ASME B16.48) including spade and spacer sets or paddle blanks for positive isolation and pipeline maintenance. Gasket compatibility is ensured for spiral wound gaskets, kammprofile gaskets, sheet fiber/PTFE gaskets, and RTJ metal rings. Pressure classes include PN6, PN10, PN16, PN25, PN40, ASME Class 150, Class 300, Class 600, Class 900, with Class 1500 and Class 2500 available for severe service applications, depending on geometry and client specifications.
Our ASME B16.11 forged fittings range covers elbows, tees, crosses, couplings, unions, nipples, reducers, caps, plugs, bushings, inserts, boss, and a full spectrum of MSS SP-97 outlets such as sockolet, threadolet, elbolet, latrolet, and nipolet for various branch connection requirements. These are available in Classes 2000#, 3000#, 6000#, and selected 9000# items. We offer precision thread forms: ASME B1.20.1 NPT, ISO 7-1 BSPT, and ISO 228 BSPP. Standard finishes include black oxide, rust preventive oil (RPO), varnish, phosphating, zinc spray, shop primer, or custom paint to specification. Each product is marked with its grade, size, rating, heat number, and Dipti branding for full material traceability and compliance.
Dipti Metal Industries provides comprehensive documentation, including MTC EN 10204 3.1 with detailed chemistry, mechanical properties, hardness, and impact tests (when ordered), NDT reports (UT/MT/PT/RT) as per Inspection Test Plan (ITP), Positive Material Identification (PMI) on request, hydrostatic pressure testing where applicable, and third-party inspection (TPI) by globally recognized agencies like BV, TUV, LR, SGS, DNV, and ABS as per the purchase order. Our packaging includes end caps/face protectors, VCI wrap, moisture barriers, and robust crates/pallets with export-worthy strapping and labels, ensuring product integrity during worldwide shipping and global project supply. Typical applications span oil & gas transmission lines, gathering networks, compressor and metering stations, refinery and petrochemical units, LNG regasification/liquefaction plants, LPG terminals, cross-country pipelines, CGD/city gas distribution, water treatment and desalination plants, firewater mains, district energy systems, offshore platforms and FPSO modules, onshore terminals and manifolds, storage tank farms, power plant balance-of-plant piping and utilities, marine engineering, and general industrial infrastructure projects operating in extremely low temperatures. We specialize in expedited manufacturing, urgent requirements, critical delivery schedules, project specific documentation, and client specific requirements, ensuring seamless supply chain management from Mumbai, India, to refineries, petrochemical complexes, LNG plants, pipelines, EPC projects, and city gas networks globally. Our engineering support and technical data sheets further aid in process optimization and asset integrity management for long-term contracts and stock replenishment strategies.
Head Office (India)
No.9, Shreepati Castle, D-1, 10–11th Khetwadi Back Road, Mumbai – 400004, Maharashtra, INDIA
☎️ Tel.: +91-22-66381301 • 📱 Mob./WhatsApp: +91-9975266499 • ✉️ Email: info@diptimetal.com / diptimetal@gmail.com