Stainless Steel SS304 WN Flange

The SS304 weld neck flange is a high-strength industrial pipeline connection component that conforms to international standards such as ASME/ANSI B16.5, ASME B16.47 and EN 1092-1. It forms a permanent integrated connection with the pipeline through a long neck weld structure and is used for sealing and structural support of pipeline systems under high pressure, high temperature and critical operating conditions. 

Long Neck Welded Joint Structure: Utilizing a long-neck tapered structure design, the weld area experiences a gradual and uniform stress transition, effectively reducing stress concentration in pipelines. Suitable for long-term operation in Class 150–Class 2500 pressure systems.

ASTM A182 F304 Material: Manufactured using SS304 stainless steel forgings conforming to ASTM A182 standards, containing ≥18% Cr and ≥8% Ni. It forms a stable passivation film in aqueous media, industrial atmospheres, and mildly corrosive environments, improving resistance to pitting and intergranular corrosion.

Precision Sealing Surface Machining: The sealing surface is precision-machined using CNC technology, with strict control over flatness and surface roughness (Ra conforming to ASME standards). This ensures stable compression sealing with standard gaskets, meeting the low-leakage design requirements of API/ASME systems.

International Standard Compatibility Design: Products are manufactured strictly according to ASME, EN, and DIN standards, ensuring complete interchangeability with mainstream global piping systems, valves, and equipment, reducing engineering installation errors and adaptation costs.

Stability for Engineering Applications: SS304 material maintains good mechanical properties and oxidation resistance in medium and high temperature environments, making it suitable for continuous-operation industrial pipeline systems, especially for energy, chemical and public works systems.

Raw Material Control: All SS304 forgings are sourced from compliant steel mills, with EN 10204 3.1 material certificates provided (3.2 optional), ensuring chemical composition and mechanical properties comply with ASTM standards and enabling furnace-level traceability.

Production Process Control: Standardized process control is implemented throughout the forging, heat treatment, and machining processes. Key parameters (temperature, pressure, deformation rate) are recorded and traceable, ensuring batch consistency and dimensional stability.

Finished Product Inspection System:
PMI spectral analysis: Ensures 100% material composition compliance with standards.
Dimensional Inspection: Utilizes calipers and CMM coordinate measuring machines.
Non-destructive Testing: UT/MT performed according to project requirements.
Pressure Testing: Sampling or full inspection according to ASME standards.

Certification and Quality System: The production system complies with ISO 9001:2015 quality management system requirements, and third-party inspection (SGS/BV/TÜV) support can be provided upon project request.

Traceability System: Each product can be traced back to the raw material furnace number, production batch, and testing records, ensuring clear, verifiable, and auditable quality responsibilities.

Stable Production and Delivery Capacity: The factory possesses independent forging and machining capabilities, capable of meeting the supply needs of bulk orders and long-term engineering projects. Standard products support rapid delivery from inventory, while non-standard products are produced on a project-by-project basis.

Lead Time Range: Standard Specifications: 7–15 days; Customized Products: 15–30 days (depending on quantity and process complexity)

Export Packaging: Anti-rust protection; Plastic protective covers for flange sealing surfaces; Fumigation-free plywood case; Moisture-proof and impact-resistant sea transport packaging design. Ensuring products are suitable for long-distance sea transport and warehousing environments.

Sample Support: Standard specification samples are provided for long-term cooperative clients and engineering projects for material verification, dimensional matching, and engineering testing.