Stainless Steel Weld Neck Flange
Stainless Steel Weld Neck Flange (SS WN Flange) is designed for high-pressure and high-temperature piping systems where strength, corrosion resistance, and leak-free performance are critical.
With a long tapered hub and butt weld connection to the pipe, the weld neck flange provides excellent stress distribution and strong mechanical integrity.
Our stainless steel weld neck flanges are widely used in oil & gas, chemical processing, power plants, shipbuilding, and offshore projects.
🔹 Key Features
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Butt weld connection ensures high strength and long service life
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Tapered hub reduces stress concentration at the weld joint
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Excellent corrosion and oxidation resistance
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Suitable for high pressure and high temperature applications
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Smooth internal bore improves flow efficiency
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Easy inspection and maintenance
🔹 Standards
Manufactured in accordance with major international standards:
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ASME B16.5 / ASME B16.47
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EN 1092-1
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GOST 12821 / GOST 33259
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DIN, JIS
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Custom standards available upon request
🔹 Materials & Grades
Available stainless steel materials include:
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ASTM A182 F304 / F304L
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ASTM A182 F316 / F316L
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ASTM A182 F321
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ASTM A182 F347
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EN 1.4301 / 1.4401 / 1.4571
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Duplex & Super Duplex (optional)
🔹 Size & Pressure Rating
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Size range: DN15 – DN2000 (1/2” – 80”)
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Pressure class: Class 150 – Class 2500
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Facing types: RF / RTJ / FF
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Manufacturing: Forged or machined
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Surface finish: Anti-rust oil / pickling & passivation
🔹 Applications
Stainless steel weld neck flanges are widely applied in:
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Oil & Gas pipelines
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Chemical & petrochemical plants
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Power generation systems
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Offshore & marine engineering
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Water treatment facilities
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Food & pharmaceutical industries
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Pressure vessels and heat exchangers
🔹 Quality Control & Inspection
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Raw material chemical & mechanical testing
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Dimensional inspection
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PMI (Positive Material Identification)
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NDT (UT, RT, MT, PT upon request)
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100% visual inspection
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EN 10204 3.1 / 3.2 certification available
🔹 Why Choose Our Stainless Steel Weld Neck Flanges
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Full compliance with international standards
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Stable export experience for global markets
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Strict quality management system
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Competitive factory pricing
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Custom sizes and special materials available
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Fast delivery for standard specifications
🔹 Packaging & Delivery
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Seaworthy wooden cases 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: according to order quantity and specification
🔹 Request a Quote
Send us your inquiry with the following details:
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Size & pressure class
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Standard (ASME / EN / DIN / GOST)
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Material grade
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Quantity
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Application or project requirement
Our technical team will provide a fast and professional quotation.