+86-13771005953 
Inquiry@sunindustry.com
Sunwen, a trusted supplier of carbon steel flanges, specializes in manufacturing forged welding neck flanges with raised face for high-performance industrial applications. In particular, forged welding neck flanges with raised face are essential in LNG (Liquefied Natural Gas) systems where strength, sealing reliability, and durability under cryogenic conditions are vital.
This article will provide a complete overview of forged welding neck flanges with raised face, from their structure and advantages to manufacturing processes and applications in the LNG industry.
What Is a Forged Welding Neck Flange with Raised Face?
A forged welding neck flange with raised face is a high-integrity flange type designed to connect pipes and equipment in demanding environments. It has two defining features:
Welding neck: A long tapered hub that smoothly transitions stress from the flange to the pipe.
Raised face: A slightly elevated sealing surface, improving gasket compression and leak protection.
Due to its superior performance, the forged welding neck flange with raised face is commonly used in pressure vessels, LNG terminals, pipelines, offshore platforms, and petrochemical facilities.
Advantages of Forged Welding Neck Flange with Raised Face
Exceptional Leak Prevention: The raised face enhances gasket compression, creating a reliable seal in LNG systems.
High Pressure and Temperature Resistance: Forged structure and tapered neck withstand intense working conditions.
Stress Reduction: The neck reduces stress concentration at the joint.
Durability in Cryogenic Applications: Ideal for LNG systems operating at -162°C.
Standard Compatibility: Available in ASME B16.5, B16.47, EN1092-1, and other global standards.
Sunwen’s forged welding neck flange with raised face products are engineered to meet these exacting requirements.
Manufacturing Process of Forged Welding Neck Flange with Raised Face
Sunwen employs strict production controls to ensure each forged welding neck flange with raised face meets technical and industry expectations.
1. Raw Material
We use high-quality carbon steel billets such as ASTM A105 and A350 LF2 for strength and low-temperature resilience.
2. Forging
Steel billets are heated to 1100–1250°C.
The shape of the forged welding neck flange with raised face is formed using open-die or closed-die forging methods.
Grain structure is refined for fatigue resistance.
3. Heat Treatment
Every forged welding neck flange with raised face undergoes:
Normalizing for structure uniformity
Tempering and quenching for strength and ductility
Annealing if low hardness is required
4. Machining
CNC machining ensures precise geometry:
Tapered neck and raised face turning
Bolt hole drilling
Surface finishing to sealing standards (e.g., 125–250 AARH)
5. Inspection & Testing
Sunwen conducts:
Dimensional checks
Ultrasonic and magnetic particle testing
Material certification
Hydro and pneumatic testing (on request)
6. Surface Treatment & Packaging
Each forged welding neck flange with raised face is:
Coated with anti-corrosion oil or painted
Sealed and packed in wooden boxes
Labeled and documented for export
Application in LNG Industry
In LNG infrastructure, a forged welding neck flange with raised face is indispensable for safe, efficient transport and processing of cryogenic gas.
Why It’s Critical:
Leak-Proof Connections: LNG systems demand zero leakage; raised face designs provide better sealing.
Cryogenic Durability: The forged carbon steel maintains integrity at extreme cold temperatures.
Pressure Handling: Withstands both internal pressure and pressure surges.
Mechanical Stress Resistance: Flanges handle vibrations, pipe movement, and thermal cycling in LNG plants.
LNG-Specific Uses:
LNG liquefaction lines
Storage tank outlet flanges
Vaporizer unit connections
Re-gasification plant pipe systems
Compressor and booster unit pipelines
Sunwen’s forged welding neck flanges with raised face are a trusted choice in these applications.
Why Choose Sunwen for Forged Welding Neck Flange with Raised Face?
Dedicated Production Facilities: Full in-house forging, heat treatment, and CNC machining.
International Compliance: All forged welding neck flange with raised face products meet ASME, API, and ISO requirements.
Global Export Experience: We deliver to LNG projects in Southeast Asia, the Middle East, and Europe.
Custom Sizes & Coatings: Fast turnaround and engineering flexibility.
Quality Certification: MTC 3.1/3.2, NDT, PMI, and third-party inspection.
Whether you need 150# or 2500# class forged welding neck flange with raised face, Sunwen provides tailored solutions with a strong reputation for reliability and precision.
The forged welding neck flange with raised face is a critical part of safe and high-performance LNG systems. It ensures leak-proof, structurally sound connections in some of the most extreme operating environments on Earth. With Sunwen’s commitment to quality, advanced forging technology, and LNG-focused experience, we help clients achieve long-lasting performance and system reliability.
For premium forged welding neck flanges with raised face, contact Sunwen – your dependable partner in carbon steel flange manufacturing.