Weld Neck Flanges Manufacturer

AstroForge Fitting Industries

AstroForge Fitting Industries is a globally recognized manufacturer, supplier, and exporter of premium Weld Neck Flanges that meet the most rigorous international standards including ASME, ANSI, DIN, EN, JIS, and ISO. Our products are available in a wide range of pressure classes—from Class 150 to Class 900 (and up to Class 1500/2500)—designed specifically for high-pressure and high-temperature applications in industries such as oil & gas, petrochemicals, power generation, refineries, and more.

Our Key Resources & Quality Commitment

We believe that exceptional quality starts with stringent standards and comprehensive resources. Our product pages and technical datasheets provide access to:

• Weld Neck Flange Tolerances & Weight Charts
• ANSI B16.5 Weld Neck Flange Specifications
• Detailed Technical Datasheets
• Manufacturing Standards & ISO Certifications
• Industry-Specific Applications & Case Studies
• Inspection, Packing, & Global Export Information

We serve industries worldwide with a strong focus on quality control and adherence to manufacturing standards. Our in-house quality management system is ISO 9001 certified, and we continuously maintain compliance with additional standards such as ISO 14001 for environmental management and ISO 45001 for occupational health and safety.

Product Overview

AstroForge Fitting Industries proudly supplies Weld Neck Flanges in a broad spectrum of materials—such as Duplex, Super Duplex, Stainless Steel, Nickel Alloys, Carbon Steel, and Alloy Steel—to meet the diverse demands of global industries. Our products are used by leading companies in South Africa, Malaysia, Singapore, the United Kingdom, the Philippines, Australia, the Middle East, and many other regions.

Why Our Weld Neck Flanges Stand Out

• Superior Engineering:
  Our weld neck design transfers stress effectively away from the weld joint, ensuring a robust and leak-free connection. This precision machining and optimal design reduce stress concentration at the flange hub, making our products ideal for extreme conditions.
• Uncompromising Quality:
  Every Weld Neck Flange is produced using advanced forging techniques, followed by heat treatment and precision machining. We enforce rigorous quality controls—including 100% radiography testing, dimensional inspections, and mechanical and non-destructive tests—to ensure compliance with ASME, ANSI, DIN, EN, JIS, and ISO standards.
• Global Manufacturing Standards:
  We adhere to international manufacturing standards and hold certifications such as ISO 9001 (Quality Management), ISO 14001 (Environmental Management), and ISO 45001 (Occupational Health and Safety). These certifications demonstrate our commitment to delivering high-quality products that meet the demands of today’s global industries.
• Comprehensive Range:
  Our extensive product range covers Weld Neck Flanges from Class 150 through Class 900, with precise dimensions and material specifications tailored for a variety of industrial applications.

Detailed Technical Specifications

ANSI / ASME B16.5 Weld Neck Flange Specifications

Our Weld Neck Flanges are produced according to stringent industry standards:

• Flange Size: From ½” (15 NB) up to 48″ (1200NB)
• Flange Classes: 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, and DIN Standard ND-6, 10, 16, 25, 40
• Material Standards: In compliance with DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, and DIN2673
• Surface Treatments: Options include Anti-rust Paint, Oil Black Paint, Yellow Transparent coatings, Zinc Plating, and Cold/Hot Dip Galvanizing
• Connection & Face Types: Available in Ring Type Joint, Lap-Joint Face, Raised Face, Flat Face, and various male-female and Tongue & Groove configurations
• Production: All flanges are forged, heat treated, and machined with precision
• Quality Documentation: Every flange comes with EN 10204/3.1B certificates, raw material certificates, 100% radiography test reports, and third-party inspection reports

In-Depth Dimensional Overview

While you can download our full technical datasheet for exact numbers, here is an overview of our dimensional ranges by pressure class:

Class 150 Weld Neck Flanges

• Nominal Pipe Sizes: 26 to 60
• Outer Diameters: Approximately 870 mm for a size 26 up to around 1854 mm for size 60
• Flange Thickness: From about 68.3 mm to over 130 mm
• Hub Dimensions: Optimized for secure load distribution, with hub base diameters from around 676.1 mm up to over 1559.1 mm
• Bolt Circles & Weight: Bolt circle diameters increase accordingly; weight ranges from about 150 kg to nearly 960 kg

Higher Pressure Classes (300, 600, 900)

• Class 300: Enhanced dimensions for higher pressure—weight ranging from roughly 280 kg to over 1000 kg
• Class 600: Engineered for even higher pressures with weights between approximately 440 kg and 2300 kg
• Class 900: The most robust design with weights from around 680 kg up to about 2400 kg or more

For detailed dimensions of every size and class, please refer to our downloadable datasheet.

Advanced Manufacturing & Quality Control

Manufacturing Process

Our state-of-the-art production facilities employ:

• Advanced Forging Techniques: Ensuring structural integrity and uniform wall thickness
• Precision Heat Treatment: Enhancing mechanical properties and durability
• Modern Machining Equipment: Achieving exact dimensions and a flawless finish
• Surface Finishing Processes: Including sand blasting, galvanizing, and specialized coatings for maximum corrosion resistance

Inspection & Quality Assurance

Our quality management system, certified under ISO 9001, ensures that every Weld Neck Flange undergoes:

• Visual and Dimensional Inspections: To detect surface defects and confirm design accuracy
• Mechanical Testing: Including tensile, hardness, and elongation tests
• Non-Destructive Testing: Radiography and magnetic particle testing to identify internal flaws
• Environmental and Safety Audits: In compliance with ISO 14001 and ISO 45001 standards

Materials & Value-Added Services

Material Options

We manufacture Weld Neck Flanges using a variety of materials:

• Carbon Steel:
  • High Temperature Grades (ASTM A105, A53, A106, API 5L)
  • Low Temperature Grades (ASTM A350 LF1, LF2, LF3)
  • High Yield Grades (ASTM A694 F42, F52, F60, F65)
• Alloy Steel: Conforming to ASTM A182 (F5, F9, F11, F22, F1, F5/F5a, F91)
• Stainless Steel: Available in multiple grades per ASTM A182 (F304, F304H, F304L, F304N, F304LN, F309H, F310, F310H, F310MoLN, F316, F316H, F316L, F316N, F316LN, F316Ti, etc.)
• Duplex & Super Duplex: ASTM A182 Duplex 2205 and UNS S32750/S32760 for superior corrosion resistance
• Nickel Alloys: Including Inconel 600/625, Incoloy 800/825, Monel, and Hastelloy, meeting ASTM standards B160, B166, B564, and B425

Value-Added Services

To further enhance our product offering, we provide:

• Specialized Coatings: Epoxy & FBE, Hot Dipped Galvanizing
• Surface Finishing: Sand Blasting, Electro Polishing, and custom finishes
• Custom Fabrication: Tailor-made cutting, threading, soldering, and welding services to suit unique project requirements

Industries We Serve

AstroForge Fitting Industries is proud to serve a vast array of industries worldwide. Our Weld Neck Flanges are an essential component in sectors including:

• Oil & Gas: For pipelines, offshore platforms, and refining processes
• Petrochemicals & Refineries: Withstand extreme conditions and corrosive environments
• Power Generation: Used in high-pressure boilers, turbines, and critical piping systems
• Chemical Processing: Ensuring safe and efficient chemical transport and processing
• Food & Dairy: Hygienic stainless steel flanges for safe food processing
• Pharmaceuticals: Meeting stringent regulatory standards for purity and safety
• Pulp & Paper: Durable flanges that handle high pressure and corrosive materials
• Specialty Chemicals: Custom-engineered solutions for aggressive chemical environments
• Marine & Offshore: Robust designs that perform reliably in saltwater and harsh weather conditions
• Construction & Infrastructure: Supporting heavy-duty piping networks in large-scale industrial projects

Export & Global Distribution

Our International Reach

AstroForge Fitting Industries serves a truly global market. We export our Weld Neck Flanges to countries across:

• North America: USA, Canada, Mexico, Panama, Costa Rica, Puerto Rico, Trinidad & Tobago, Jamaica, Bahamas, Denmark
• Europe: United Kingdom, Netherlands, Germany, France, Italy, Spain, Russia, Norway, Belgium, Greece, Hungary, Albania, Austria, Finland, Ireland, Croatia, Slovenia, Malta, Switzerland, Slovakia, Czech Republic, Portugal
• Asia: India, Malaysia, Singapore, Indonesia, Thailand, Vietnam, South Korea, Japan, Taiwan, Cambodia, Sri Lanka, Maldives, Bangladesh, Myanmar
• Middle East: Saudi Arabia (KSA), United Arab Emirates (UAE), Qatar, Bahrain, Oman, Kuwait, Turkey, Yemen, Syria, Cyprus, Iran, Iraq, Jordan
• Africa: South Africa, Nigeria, Algeria, Angola, Libya, Egypt, Gabon, Sudan, Equatorial Guinea, The Republic Of Congo
• South America: Venezuela, Argentina, Bolivia, Colombia, Ecuador, Guyana, Paraguay, Uruguay, Brazil, Chile
• Oceania: Australia

Cities & Industrial Hubs

We ensure timely delivery and excellent service to major cities and industrial centers worldwide. Our key export destinations include: Mumbai, Thane, Navi Mumbai, Pune, New Delhi, Secunderabad, Gimhae-si, Haryana, Colombo, Lahore, Thiruvananthapuram, Milan, Moscow, Dallas, Coimbatore, Jakarta, Istanbul, Bangkok, Kuwait City, Sharjah, Petaling Jaya, Ernakulam, Abu Dhabi, Tehran, Calgary, Noida, Riyadh, Vung Tau, Al Khobar, Atyrau, Lagos, Ulsan, Faridabad, Houston, Hanoi, Toronto, Hong Kong, Rajkot, Bengaluru, Chennai, Surat, New York, Caracas, Howrah, Sydney, Ahvaz, Karachi, Algiers, Pimpri-Chinchwad, Vadodara, Kolkata, Gurgaon, Ahmedabad, Chiyoda, Dubai, Seoul, Hyderabad, Singapore, Doha, Jeddah, Manama, Montreal, Brisbane, Los Angeles, Ankara, Ho Chi Minh City, Bhopal, Mexico City, Ludhiana, Aberdeen, Cairo, Geoje-si, Perth, Santiago, Chandigarh, Indore, Kuala Lumpur, Rio de Janeiro, Dammam, London, Muscat, Edmonton, Busan, Visakhapatnam, Bogota, Melbourne, Madrid, La Victoria, Granada, Courbevoie, Al Jubail, and Port-of-Spain.

Our robust logistics and global partnerships ensure that every order is delivered safely, on time, and in compliance with local regulations.

Conclusion

AstroForge Fitting Industries is dedicated to delivering world-class Weld Neck Flanges designed to meet the demanding requirements of high-pressure and high-temperature applications. With a commitment to advanced manufacturing, strict quality control, comprehensive ISO and international certifications, and an expansive global distribution network, we are your trusted partner for reliable industrial piping solutions.

Whether you are upgrading your refinery, designing a new offshore platform, or implementing high-pressure systems in power generation, our products and services are tailored to provide exceptional performance and long-term durability.

For further technical details, international export information, or to request a custom quote, please contact our expert team today or download our complete technical datasheet.