Carbon Steel Weld Neck Flanges manufactured to ASME B16.5 are forged pipe fittings specially engineered for high-pressure and high-temperature piping systems.
With a long tapered hub and smooth butt-weld end design, these flanges ensure superior stress distribution, reduced fatigue failure, and long-term leak-proof performance in critical industrial service.
Built primarily from ASTM A105 carbon steel, this flange type is the most widely specified for general and heavy-duty process piping around the world.
Key Features
- Material: Forged ASTM A105 carbon steel for consistent mechanical strength and toughness
- Connection Type: Butt-weld end for permanent, high-integrity pipeline joints
- Long Tapered Hub: Minimizes stress concentration at the pipe-flange junction
- Pressure Ratings: Class 150, 300, 600, 900, 1500, 2500
- Standard: Strictly manufactured to ASME B16.5 dimensions
- Face Types: RF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint) available
- Smooth Bore: Improves flow efficiency and lowers pressure turbulence
- Temperature Resistance: Suitable for high-temperature and high-pressure operating conditions
Materials & Grades
- Main Material: ASTM A105 Carbon Steel
- Optional Low-Temp Carbon Steel: A350 LF2
- Surface Treatment: Anti-rust oil coating (standard)
Size & Pressure Range
- Nominal Sizes: 1/2″ – 80″ (DN15 – DN2000)
- Pressure Class: Class 150 – Class 2500
- Manufacturing Process: Forged & machined
- Custom sizes available upon drawing approval
Typical Applications
Our ASME B16.5 A105 Weld Neck Flanges are commonly used in:
- Oil & gas upstream and pipeline systems
- Refineries and petrochemical plants
- Power generation facilities and boiler piping
- Chemical processing units
- Pressure vessels and heat exchangers
- Industrial process piping requiring high structural integrity
Quality & Certification
- Full raw material chemical & mechanical test reports
- PMI (Positive Material Identification) inspection
- 100% dimensional and visual inspection
- Optional NDT: UT, MT, PT available on request
- EN 10204 3.1 / MTC available with every shipment
Why Choose Our A105 WN Flanges ASME B16.5
- Full compliance with ASME B16.5 dimensional standards
- Forged construction ensures reliable performance under pressure
- Consistent quality for repeat B2B bulk orders
- Custom machining and project-based solutions supported
- Fast lead times for standard inventory sizes
- Competitive factory-direct pricing
Packaging & Shipping
- Seaworthy wooden crates or plywood pallets
- Plastic face protectors to prevent scratching
- Permanent marking: size, class, material, standard, heat no.
- Flexible delivery terms based on order quantity
Request A Quote
To get an accurate quotation, please provide:
- Required size (NPS/DN)
- Pressure class
- Face type (RF/FF/RTJ)
- Order quantity
- Application or project requirement
Our sales team will respond quickly with a formal offer.