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, branch outlets • Sizes 1/2″–48″ • PN6–PN40 • Class 150–900 (higher on request) • OEM machining & protective coatings available.
Dipti Metal Industries manufactures and exports ASTM A694 F42 high-yield carbon steel products under the trusted Dipti® brand: forged flanges, forged pipe fittings (socket weld & threaded), and project-specific forged components. Based in Mumbai, India, we serve EPCs, OEMs and stockists across energy, oil & gas transmission, midstream pipelines, city gas distribution, refineries, petrochemicals, power, water, shipbuilding, and general engineering.
ASTM A694 F42 is a high-yield carbon steel forging grade developed for high-pressure transmission service. It is widely used for pipeline flanges and forged fittings where elevated strength and notch toughness are required. Interfaces supplied include ASME B16.5, ASME B16.47 Series A/B, MSS SP-44, EN 1092-1 PN-rated faces, and ASME B16.11 for socket weld and threaded fittings. Typical pipeline-equivalent strength class is comparable to API 5L X42 / ISO 3183 L290 (approximate cross-reference for guidance only).
| Yield Strength (min) | ≥ 290 MPa (approx. F42 grade requirement) |
|---|---|
| Tensile Strength | ~ 415–550 MPa (typical range) |
| Elongation (min) | ≥ 20% (typical) |
| Impact Toughness | As per purchase order / service conditions |
| Hardness | Typically 120–180 HB (process dependent) |
| C | ≤ 0.26 | Mn | 0.90–1.35 |
|---|---|---|---|
| Si | 0.15–0.30 | P | ≤ 0.035 |
| S | ≤ 0.040 | Cu | ≤ 0.40 |
| Ni | ≤ 0.50 | Cr | ≤ 0.30 |
| Mo | ≤ 0.20 | V/Nb | microalloyed on request |
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/teflon 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 F42.
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 approximate; mechanical properties and chemistry shall be verified per PO.
Pipeline transmission lines, crude oil and natural gas flowlines, gathering systems, compressor and metering stations, refineries, petrochemicals, fertilizers, power plants, district heating, water injection, firewater, desalination, shipbuilding, marine and offshore topsides, onshore terminals, process skids, storage tank farms, cross-country pipelines, city gas distribution, gas utility networks, chemical handling, general engineering and construction.
Dipti Metal Industries supplies ASTM A694 F42 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 F42 forged flanges and forged fittings by Dipti Metal Industries are produced using quality-controlled steel billets selected for high-yield performance, enabling reliable pipeline flange joints and pressure-retaining connections. The product range includes F42 weld neck flanges, F42 slip-on flanges, F42 blind flanges, F42 socket weld flanges, F42 threaded flanges with NPT and BSPT threads, F42 lap joint flanges with stub ends, F42 long weld neck flanges for towers and columns, F42 reducing flanges for dissimilar pipe sizes, F42 orifice flanges per ASME B16.36 with tapping, and F42 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 for marine or coastal use. 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 stipulations to promote gasket seating.
For forged fittings, the catalog covers F42 socket weld elbows 90° and 45°, F42 threaded elbows 90° and 45°, F42 street elbows M-F, F42 reducing elbows, F42 equal tees and F42 reducing tees, F42 equal crosses and F42 reducing crosses, F42 full couplings, F42 half couplings, F42 reducing couplings, F42 unions ground joint, F42 caps, F42 hex plugs and F42 square plugs, F42 hex bushings, F42 close nipples, F42 barrel nipples, F42 hex nipples, F42 threaded swage nipples, F42 reducing inserts, F42 boss, and F42 branch outlets such as F42 sockolet, F42 threadolet, F42 elbolet, F42 latrolet and F42 nipolet manufactured to MSS SP-97 where applicable. 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, visually examined and supplied free of burrs; end faces are protected by caps; clean packaging ensures corrosion protection during transit; palletized boxes are strapped for export.
Quality control embraces MTC EN 10204 3.1 with heat number traceability, chemical analysis and mechanical test reporting, Charpy impact testing when ordered, hardness checks across representative locations, UT, MT and PT non-destructive examinations as specified, positive material identification on request, and third-party inspections from BV, TUV, LR or SGS as nominated by the client. Dimensional inspection verifies OD, ID, thickness, raised face height, bolt circle diameter and hole diameter, pitch circle concentricity, and thread gauge compliance. Gasket compatibility includes spiral wound gaskets, kammprofile gaskets, ring type joint metal gaskets (for RTJ), sheet fiber gaskets and PTFE gaskets as the fluid service requires.
Typical applications involve crude oil transmission pipelines, natural gas pipelines, gathering systems, compressor stations, metering skids, refinery units, petrochemical crackers, LNG regasification, LPG terminals, cross-country pipelines, city gas networks, water treatment plants, desalination plants, firewater mains, district cooling and heating lines, offshore platforms, FPSO topsides modules, onshore terminal pipe racks, storage tank farms, power plant balance of plant piping, utility lines, and general mechanical services. The F42 class offers yield strength comparable to API 5L X42 / ISO 3183 L290 line pipe steel, making it well-suited for flanged joints in similar service conditions where the flange has to match pipeline strength levels. End users appreciate the consistent serration quality, accurate bolt holes, smooth bore alignment and stringent QA documentation that Dipti Metal Industries provides.
Major specifications and terms associated with this product include ASTM A694 F42 forged flanges, ASTM A694 F42 weld neck flange RF, ASTM A694 F42 weld neck flange RTJ, ASTM A694 F42 slip-on flange SORF, ASTM A694 F42 slip-on flange SOFF, ASTM A694 F42 blind flange BLRF, ASTM A694 F42 blind flange RTJ, ASTM A694 F42 threaded flange NPT, ASTM A694 F42 threaded flange BSPT, ASTM A694 F42 socket weld flange SWRF, ASTM A694 F42 lap joint flange, ASTM A694 F42 long weld neck flange, ASTM A694 F42 reducing flange, ASTM A694 F42 orifice flange B16.36, ASTM A694 F42 spectacle blind B16.48, ASTM A694 F42 paddle blank, ASTM A694 F42 spade and spacer, ASTM A694 F42 ring type joint, ASTM A694 F42 raised face, ASTM A694 F42 flat face, MSS SP-44 pipeline flanges, EN 1092-1 PN16 flange, EN 1092-1 PN25 flange, EN 1092-1 PN40 flange, ASME Class 150 flange, ASME Class 300 flange, ASME Class 600 flange, ASME Class 900 flange, forged fittings B16.11, F42 socket weld elbow, F42 threaded elbow, F42 equal tee, F42 reducing tee, F42 cross, F42 full coupling, F42 half coupling, F42 reducing coupling, F42 union, F42 cap, F42 hex plug, F42 square plug, F42 hex bushing, F42 close nipple, F42 barrel nipple, F42 hex nipple, F42 swage nipple, F42 reducing insert, F42 boss, F42 sockolet, F42 threadolet, F42 elbolet, F42 latrolet, F42 nipolet, pipeline fittings, transmission flanges, hydrotested spools, hot-dip galvanized nuts and bolts, zinc-plated bolting sets, PTFE coating on studs (on request), serration finish per MSS SP-6, machining per drawing, QC plan, ITP, WPS/PQR for welding, packaging lists and marking with heat number, grade, size, pressure class and Dipti brand.
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