Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint, Long Weld Neck, Reducing, Orifice, Spectacle Blinds • B16.11 elbows, tees, crosses, couplings, unions, nipples, reducers, caps, plugs, bushings, inserts, outlets • Sizes 1/2″–48″ • PN6–PN40 • Class 150–900 • OEM machining & protective coatings available.
Dipti Metal Industries manufactures and exports ASTM A694 F52 high-yield carbon steel flanges and forged fittings under the trusted Dipti® brand. Based in Mumbai, India, we supply EPCs, OEMs, distributors and stockists in 60+ countries, serving sectors like oil & gas pipelines, refineries, petrochemicals, LNG, power, shipbuilding, and water projects.
ASTM A694 F52 is a high-yield carbon steel forging grade developed for pipeline flanges and forged fittings operating at higher pressures than F42. Its strength class is approximately equivalent to API 5L X52 / ISO 3183 L360. Dipti supplies flanges and fittings in compliance with ASME B16.5, ASME B16.47 Series A/B, MSS SP-44, EN 1092-1, and ASME B16.11 standards.
| Yield Strength | ≥ 360 MPa |
|---|---|
| Tensile Strength | ~ 455–625 MPa |
| Elongation | ≥ 20% |
| Hardness | 120–190 HB |
| C | ≤ 0.26 | Mn | 0.90–1.35 |
|---|---|---|---|
| Si | 0.15–0.30 | P | ≤ 0.035 |
| S | ≤ 0.040 | Ni | ≤ 0.50 |
| Cr | ≤ 0.30 | Mo | ≤ 0.20 |
Values are indicative/typical only. Confirm against latest ASTM A694, ASME, EN, and project specifications.
Facing: RF • FF • RTJ (where applicable) • Pressure: PN6–PN40 • Class: 150–900 • Sizes: 1/2″–48″ • Serration per MSS SP-6 • Bolt drilling per EN/ASME.
| Flange Type | Common Identifiers | Typical Use | Notes |
|---|---|---|---|
| Weld Neck (WN) | EN Type 11 • ASME WN | High-pressure, cyclic, pipelines | Butt-weld neck, stress distribution, RTJ/RF |
| Slip-On (SO) | EN Type 01/12 • ASME SO | General service, alignment ease | SORF/SOFF; fillet welds both sides |
| Blind (BL) | EN Type 05 • ASME BL | Line termination / maintenance | Available RF/RTJ; drilling for tap on request |
| Socket Weld (SW) | ASME SWRF | Small-bore, medium pressure | Gap allowed for expansion at root |
| Threaded (THD) | NPT/BSPT/BSPP | When welding is undesired | Sealant dope/PTFE as per site practice |
| Lap Joint (LJ) | Backing flange | Lined systems, frequent dismantling | Used with stub ends |
| Long Weld Neck (LWN) | Integral neck | Vessels, towers, special facings | Custom lengths and bores |
| Reducing / Orifice | ASME B16.36, custom reducing | Flow measurement / size transitions | Tapped jack screws / RTJ grooves on request |
| Spectacle Blinds | ASME B16.48 • Spade & Spacer | Positive isolation | Paddle blank sets, bleed rings optional |
Classes: 2000# • 3000# • 6000# • 9000# (select items) • Threads: NPT, BSPT, BSPP • Sizes: 1/8″–4″ (DN 6–100) • Material: ASTM A694 F52.
Manufacturing in closed-die forging / upset forging; heat treatment as required by service; shot blasting; machining per drawing; gauging of threads; 100% visual; NDT as ordered; protective oil / VCI wrap; palletized export packing.
Cross-references are indicative; verify mechanicals/chemistry per purchase order.
Pipeline transmission lines, gas and oil flowlines, gathering systems, compressor stations, metering skids, refinery units, petrochemical plants, LNG regasification and liquefaction, LPG terminals, cross-country pipelines, city gas distribution networks, water treatment plants, desalination plants, firewater mains, district heating and cooling, offshore platforms and FPSO modules, onshore terminals and manifolds, storage tank farms, power plant balance of plant piping, utility lines, general mechanical and construction services.
Dipti Metal Industries supplies ASTM A694 F52 forged flanges and forged fittings to customers in India (Mumbai, Delhi, Chennai, Bengaluru, Hyderabad, Ahmedabad, Pune, Kolkata, Surat), United Arab Emirates (Dubai, Abu Dhabi, Sharjah), Saudi Arabia (Riyadh, Jeddah, Dammam, Jubail, Yanbu), Qatar (Doha), Oman (Muscat, Sohar, Duqm), Bahrain (Manama), Kuwait (Kuwait City, Ahmadi), Iraq (Basra, Baghdad, Erbil), Turkey (Istanbul, Ankara, Izmir), Israel (Haifa, Ashdod), Jordan (Amman, Aqaba), Egypt (Cairo, Alexandria, Suez), South Africa (Johannesburg, Durban, Cape Town), Kenya (Nairobi, Mombasa), Nigeria (Lagos, Port Harcourt, Abuja), Ghana (Accra, Tema, Takoradi), Ethiopia (Addis Ababa), Tanzania (Dar es Salaam), Uganda (Kampala), Morocco (Casablanca, Tangier), Tunisia (Tunis), Algeria (Algiers, Oran), Libya (Tripoli), United States (Houston, Dallas, Chicago, Los Angeles, New York), Canada (Toronto, Calgary, Edmonton, Vancouver, Montreal), Mexico (Monterrey, Mexico City), Brazil (Rio de Janeiro, São Paulo), Argentina (Buenos Aires), Chile (Santiago), Peru (Lima), Colombia (Bogotá, Cartagena), Ecuador (Guayaquil), Uruguay (Montevideo), Paraguay (Asunción), Bolivia (Santa Cruz), United Kingdom (London, Aberdeen), Ireland (Dublin), Germany (Hamburg, Essen, Frankfurt), France (Paris, Marseille), Spain (Madrid, Barcelona, Bilbao), Portugal (Lisbon, Porto), Italy (Milan, Genoa), Netherlands (Rotterdam, Amsterdam), Belgium (Antwerp, Brussels), Luxembourg (Luxembourg City), Switzerland (Zurich, Geneva), Austria (Vienna), Poland (Gdańsk, Warsaw), Czechia (Prague), Slovakia (Bratislava), Hungary (Budapest), Slovenia (Ljubljana), Croatia (Rijeka, Split), Serbia (Belgrade), Romania (Constanța, Bucharest), Bulgaria (Varna, Sofia), Greece (Athens, Thessaloniki), Norway (Stavanger, Bergen), Sweden (Stockholm, Gothenburg), Finland (Helsinki), Denmark (Copenhagen, Esbjerg), Iceland (Reykjavík), Ukraine (Odesa), Moldova (Chișinău), Russia (Moscow, St. Petersburg), Kazakhstan (Atyrau, Almaty), Uzbekistan (Tashkent), Azerbaijan (Baku), Armenia (Yerevan), Georgia (Batumi, Tbilisi), China (Shanghai, Tianjin, Shenzhen), Hong Kong, Taiwan (Kaohsiung), Japan (Tokyo, Yokohama), South Korea (Ulsan, Busan), Singapore, Malaysia (Kuala Lumpur, Johor Bahru), Thailand (Bangkok, Map Ta Phut), Vietnam (Ho Chi Minh City, Haiphong), Indonesia (Jakarta, Surabaya, Batam), Philippines (Manila, Cebu), Myanmar (Yangon), Cambodia (Phnom Penh), Laos (Vientiane), Sri Lanka (Colombo), Bangladesh (Chattogram, Dhaka), Nepal (Birgunj), Bhutan (Phuentsholing), Maldives (Malé), Australia (Perth, Melbourne, Sydney), New Zealand (Auckland), and more industrial hubs worldwide.
ASTM A694 F52 forged flanges and forged fittings by Dipti Metal Industries are produced from quality-controlled billets for high-yield performance and reliable pressure-retaining joints. The range includes F52 weld neck flanges, F52 slip-on flanges, F52 blind flanges, F52 socket weld flanges, F52 threaded flanges with NPT and BSPT threads, F52 lap joint flanges with stub ends, F52 long weld neck flanges for vessels and columns, F52 reducing flanges for dissimilar pipe sizes, F52 orifice flanges per ASME B16.36 with tapping, and F52 spectacle blinds, spades and spacers per ASME B16.48. Surface finish options include black oxide, rust preventive oil, shop primer, phosphating, zinc spray and paint systems. Machining tolerances follow ASME and EN rules; bolt drilling is per standard tables; raised face, flat face and ring type joint grooves are machined to specification; serrations follow MSS SP-6 or EN to promote gasket seating and sealing integrity under cyclic loads.
Forged fittings cover F52 socket weld elbows 90° and 45°, F52 threaded elbows 90° and 45°, F52 street elbows M-F, F52 reducing elbows, F52 equal tees and reducing tees, F52 equal crosses and reducing crosses, F52 full couplings, half couplings and reducing couplings, F52 unions ground joint, F52 caps, F52 hex plugs and square plugs, F52 hex bushings, F52 close nipples, barrel nipples and hex nipples, F52 threaded swage nipples, F52 reducing inserts, F52 boss, and F52 branch outlets such as sockolet, threadolet, elbolet, latrolet and nipolet manufactured to MSS SP-97. Thread forms include ASME B1.20.1 NPT, ISO 7-1 BSPT and ISO 228 BSPP. Pressure designations cover 2000#, 3000#, 6000# and selected 9000# items depending on geometry. Each fitting is gauged and visually examined; ends are protected by caps; clean packaging ensures corrosion protection; palletized boxes are strapped for export.
Quality control includes MTC EN 10204 3.1 with heat number traceability, chemical analysis and mechanical test reporting, Charpy impact testing when ordered, hardness checks, UT, MT and PT non-destructive examinations as specified, positive material identification (PMI) on request, and third-party inspections by BV, TUV, LR or SGS. Dimensional inspection verifies OD, ID, thickness, raised face height, bolt circle diameter and hole diameter, pitch circle concentricity, and thread gauge compliance. Compatible gasket types include spiral wound gaskets, kammprofile gaskets, RTJ metal rings (for RTJ), sheet fiber and PTFE gaskets, metallic gaskets for high-pressure sealing, and specialty gaskets as per service medium.
Use cases span crude oil and gas transmission lines, gathering systems, compressor and metering stations, refinery and petrochemical units, LNG regasification terminals, LPG facilities, cross-country pipelines, CGD/city gas networks, water and desalination plants, firewater mains, district cooling and heating networks, offshore platforms and FPSO topsides, onshore terminal manifolds, storage tank farms, power plant balance-of-plant piping, utilities, mechanical services and general engineering. The F52 grade offers yield strength aligned with API 5L X52 / ISO L360, enabling flanged pipeline joints and forged fittings to meet the demanded strength and toughness in transmission service.
SEO descriptors and purchase terms embedded herein include ASTM A694 F52 forged flanges, ASTM A694 F52 weld neck flange RF and RTJ, ASTM A694 F52 slip-on flange SORF and SOFF, ASTM A694 F52 blind flange BLRF and BLRTJ, ASTM A694 F52 threaded flange NPT and BSPT, ASTM A694 F52 socket weld flange SWRF, ASTM A694 F52 lap joint flange with stub end, ASTM A694 F52 long weld neck flange, ASTM A694 F52 reducing flange, ASTM A694 F52 orifice flange B16.36, ASTM A694 F52 spectacle blind B16.48, ASTM A694 F52 spade and spacer, ASTM A694 F52 paddle blank, ASTM A694 F52 ring type joint groove, raised face and flat face, MSS SP-44 pipeline flanges, EN 1092-1 PN16 PN25 PN40 flanges, ASME Class 150 Class 300 Class 600 Class 900 flanges, forged fittings ASME B16.11, F52 socket weld elbow, F52 threaded elbow, F52 tee, F52 cross, F52 coupling, F52 union, F52 cap, F52 plug, F52 bushing, F52 nipple, F52 swage nipple, F52 reducing insert, F52 boss, F52 sockolet, F52 threadolet, F52 elbolet, F52 latrolet, F52 nipolet, pipeline fittings, transmission flanges, hydrotested spools, zinc-plated bolting sets, PTFE coated studs on request, serration finish per MSS SP-6, machining per drawing, QC plan, ITP, WPS/PQR, packaging & marking with heat number, grade, size, pressure class and Dipti brand for traceability and compliance in global exports from Mumbai India.
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