Carbon Steel Weld Neck Flanges are forged piping components designed for high-pressure and high-temperature systems.
They provide a reliable butt weld connection with long tapered hub, ensuring excellent stress distribution and leak-proof performance in critical piping applications.
These flanges are widely used in oil & gas pipelines, chemical processing plants, pressure vessels, refineries, and power generation facilities, meeting the demands of industrial projects worldwide.
🔹 Key Features
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Forged Carbon Steel: ASTM A105 / A350 LF2 / A694 F52, excellent mechanical strength
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Butt Weld Connection: Long hub design distributes stress and minimizes fatigue
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Pressure Rating: Class 150 – Class 2500, suitable for various industrial pressure requirements
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Standard Compliance: ASME B16.5, ASME B16.47, EN 1092-1, DIN, JIS, GOST 12821 / 33259
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Facing Options: RF (Raised Face), RTJ (Ring Type Joint), FF (Flat Face)
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Flow Efficiency: Smooth bore design reduces turbulence and pressure drop
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Durability: High impact and temperature resistance for demanding applications
🔹 Materials & Grades
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Carbon Steel: ASTM A105, ASTM A350 LF2, ASTM A694 F52
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Optional: Low Alloy Steel for high-temperature applications
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Surface finish: Anti-rust oil, pickling, or passivation
🔹 Size & Dimensions
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Size range: DN15 – DN2000 (1/2” – 80”)
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Pressure Class: Class 150 – 2500
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Facing: RF / RTJ / FF
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Manufacturing: Forged or machined
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Custom sizes available per drawings
🔹 Applications
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Oil & Gas pipelines
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Petrochemical & Chemical plants
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Power plants & Boilers
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Refineries & Offshore projects
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Pressure vessels & Heat exchangers
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Water treatment systems
🔹 Quality Control & Certification
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Raw material chemical and mechanical testing
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Positive Material Identification (PMI)
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NDT (UT, RT, MT, PT) available on request
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100% visual inspection
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EN 10204 3.1 / 3.2 / Mill Test Certificates available
🔹 Why Choose Our Carbon Steel Weld Neck Flanges
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Strict compliance with international standards (ASME, EN, DIN, GOST)
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Stable experience supplying B2B clients globally
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Custom fabrication per drawings or project specifications
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Fast delivery for standard and special orders
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Competitive pricing with guaranteed quality
🔹 Packaging & Delivery
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Seaworthy wooden crates or pallets
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Protective plastic caps on flange faces
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Marking: size, material, standard, heat number
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Delivery time: per order quantity and specification
🔹 Request a Quote
Please provide:
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Size & pressure class
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Material grade
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Standard (ASME / EN / DIN / GOST)
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Quantity
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Application or project details
Our technical sales team will provide a fast, accurate quotation.