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Weld Neck Flange (WNF) – Forged for High-Pressure Integrity custom

Weld Neck Flange (WNF) – Forged for High-Pressure Integrity Manufacturers

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Material & Process Introduction

Jiangyin Gaoxin Process: Stabilizing WP321/321H for Superior Performance Our Weld Neck Flanges (WNF) are manufactured using a seamless forging process, ensuring maximum grain structure refinement and strength. Jiangyin Gaoxin utilizes premium forging materials, including carbon steel (such as ASTM A105), stainless steel (ASTM A182 F304/F316), and advanced stabilization alloys like WP321/321H (UNS S32100/S32109) for extreme sensitization resistance. The process begins with near-net shape forging under stringent temperature controls. The defining tapered high-hub is forged as an integral part, facilitating smooth stress transition. This is followed by critical solution annealing or stabilization heat treatment to optimize corrosion resistance and mechanical properties. Finally, precision CNC machining achieves exact dimensions for the tapered hub, raised face, and weld end preparation, ensuring a perfect match for high-pressure butt-welding connections.

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Weld Neck Flange (WNF) Technical Specifications

ParameterSpecification Detail
Material GradeCarbon steel ASTM A105, stainless steel A182 F304/F316, WP321/321H
Design StandardASME B16.5, ASME B16.47, EN 1092-1, DIN, GB/T, SH, HG
Pressure ClassASME Class 150 - 2500; European PN6 - PN320
Size RangeDN15 - DN1500 (1/2" - 60"), larger for bespoke designs
Bore/ScheduleSTD, XS, SCH40, SCH80 and other scheduled bores
Facing OptionsRaised Face (RF), Flat Face (FF), RTJ

Specification Range

Comprehensive Sizing, Customized Solutions: Meeting International Standards and Bespoke Demands Backed by 35 years of specialized expertise, Jiangyin Gaoxin Pipe Fittings Co., Ltd offers a vast specification range for Weld Neck Flanges, designed to meet the full spectrum of global engineering project demands. We produce a complete series from (Nominal Diameter) DN15 to DN1500 (1/2" - 60") and above for bespoke designs. Our manufacturing pressure ratings cover ASME Class 150 to Class 2500, and European PN6 to PN320. These are available in various scheduled bore sizes (STD, XS, SCH40, SCH80, etc.). With our advanced in-house capabilities, including heavy-duty (hydraulic presses) and (CNC machine tools), we supply finished WNFs certified to rigorous standards such as ASME B16.5, B16.47, EN 1092-1, DIN, GB/T, and specific industry norms like SH and HG. Our engineering team can also provide precise finish-machining for custom WNF with(special dimensions) or tighter tolerances based on bespoke drawings.

High-Pressure Safety Barrier: Four Core Commitments of Jiangyin Gaoxin WNF

Choosing Jiangyin Gaoxin’s Weld Neck Flanges is an investment in a robust safety barrier for critical high-pressure and extreme-temperature systems, ensuring long-term stable operation. Our WNFs offer four core commitments.

  • Superior Stress Distribution: the long, tapered hub design facilitates exceptional stress distribution and transition, significantly reducing stress concentration at the flange base.
  • Leak-Proof Structural Integrity: the butt-weld connection offers maximum structural integrity and leak-proof security, outperforming other flange types under severe operating conditions.
  • High-Temperature Stability: through our solution annealing and stabilization heat treatment (especially for WP321/321H alloys), we guarantee high-temperature stability, resisting fatigue and creep.
  • Traceability & Quality Consistency: our rigorous manufacturing traceability mechanism and robust Non-Destructive Testing (NDT) ensure unwavering quality consistency for every single Weld Neck Flange. This minimizing unplanned shutdown risks and upholds our commitment to delivering an "Unwavering high-pressure security barrier."

Application Scenarios

Connecting Energy and Power: Serving the industrial heart in the Most Rigorous Operating Conditions Jiangyin Gaoxin's Weld Neck Flanges are widely deployed in connecting the vital industrial heart of national energy and power systems worldwide. In the refinery and petrochemical sectors, they are the definitive choice for critical connections within hydrogen cracking, catalytic cracking, and delayed coking units, particularly in high-temperature reactor systems and pipelines carrying severe high-pressure, corrosive media where structural integrity is paramount. In the power generation industry, our WNFs serve critical systems in supercritical and ultra-supercritical thermal power plants, connecting boiler superheaters, reheaters, and main superheated steam piping systems that must withstand extreme creep and fatigue. Furthermore, in high-pressure oil and gas transmission pipelines, severe industrial process piping, pharmaceutical high-temperature cleaning lines, and auxiliary systems for nuclear power, Jiangyin Gaoxin WNF provide indispensable reliability. Their superior strength and leak-proof property ensure structural reliability and security, consistently connecting the heart of energy worldwide.

  • Q: What is the maximum pressure class available for Weld Neck Flanges?
  • A: Our Weld Neck Flanges are available up to ASME Class 2500 and European PN320, suitable for the most demanding high-pressure and high-temperature applications.
  • Q: Can WNF flanges be supplied in WP321/321H material for high-temperature service?
  • A: Yes, we manufacture Weld Neck Flanges in WP321/321H (UNS S32100/S32109) stabilization alloys for applications requiring extreme sensitization resistance and high-temperature stability.
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Jiangyin Gaoxin Pipe Fittings Co., Ltd.
About Us
JIANGYIN GAOXIN PIPE FITTINGS CO.,LTD.
Our company is a professional manufacturer of pressure piping components. As Weld Neck Flange (WNF) – Forged for High-Pressure Integrity Manufacturers，Our product range covers butt-weld, socket-weld, and threaded pipe fittings, including flanges and customized non-standard parts. These products are widely used in industries such as oil & gas, chemical processing, power generation, shipbuilding, papermaking, metallurgy, pharmaceuticals, and food processing. We manufacture according to standards such as ASME, EN,JIS,DIN,ANSI,GOST, MSS, GB/T,HG, DL, SH, SY,and have a complete range of inspection equipment, a strict quality control system, and various certifications（PED,AD2000,EAC, ABS,BV, DNV,NORSOK M650, ISO9001,ISO14001,ISO45001,etc.）, making us a leader in the industry.

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