SS 304L forged flanges

Wenzhou Longan Flange Co., Ltd. is the engineering choice when your project requires high-quality SS 304L forged flanges Made in China. By limiting carbon content to ≤ 0.03%, we provide industrial piping networks with protection against intergranular corrosion in the heat-affected zone, ensuring long-term sealing stability in municipal and industrial fluid lines.

Eliminating Sensitization Failures in Welded Piping Arrays

Sensitization during field welding is a major cause of failure in industrial piping networks. When standard stainless steel is heated, chromium carbides form at the grain boundaries, leaving the steel vulnerable to rapid corrosion.

This SS 304L forged flanges resolves this issue through its low-carbon formulation (≤ 0.03%). This allows field technicians to weld connections directly onto oil pipelines and chemical process vessels without needing expensive, time-consuming post-weld stress relief annealing.

Target Application Environments

• LNG Storage Infrastructure: Low-temperature pressure vessels and cryogenic fluid transport lines.

• Food Processing Lines: Highly sanitary storage vats, pasteurization loops, and clean-in-place fluid systems.

• Urban Energy Projects: Heavy-duty municipal hot water networks and power generation cooling system piping.

Mechanical and Physical Properties

Comparative Performance Metrics

• Vs Standard 304 Stainless Steel: SS 304L forged flanges offers a 30% improvement in intergranular corrosion protection due to its lower carbon content. While there is a minor 6% reduction in tensile strength (485 MPa vs 515 MPa), it is highly preferred for welded processing equipment.

• Vs Mo-Alloyed Grades: Provides a 20% to 30% raw material cost advantage for projects where high chloride pitting protection is not explicitly required.

Paperless Quality Assurance Testing

Our workshop uses a paperless ERP data system to track each component through the production line. We use precise digital calipers and optical comparators to confirm raised face dimensions, bolt hole alignments, and surface roughness parameters, keeping hardness values strictly at or below 187 HB.

Standardized Protective Export Packaging

Each piece is carefully cleaned and wrapped in heavy-duty polyethylene film. Smaller items are packed into thick cardboard boxes with cardboard dividers, while large industrial components are bolted down inside heavy wooden crates to ensure safe transport.

Product Technical FAQ

Why should I choose SS 304L forged flanges over standard 304 for applications requiring extensive welding?

The lower carbon content (≤ 0.03%) prevents chromium carbide precipitation during welding. This allows the heat-affected zone to retain its full corrosion resistance without requiring post-weld heat treatment.

What is the maximum safe operating temperature for this component?

This component can operate in non-scaling industrial applications up to a maximum continuous service temperature of 870°C (1600°F).

How does the forging process improve physical reliability?

Forging realigns the grain flow of the steel to match the shape of the flange. This improves mechanical performance, delivering a tensile strength of ≥ 485 MPa and an elongation rate of ≥ 40%.