304 Stainless Steel Flange

The 304 Stainless Steel Flange is a pipe fitting made of ASTM A182 F304/F304L stainless steel forgings, used to achieve a reliable sealing connection between pipes, valves, pumps, and pressure equipment. 

Corrosion Resistance
304 stainless steel contains a high proportion of chromium and nickel, which forms a stable passivation film on the surface, providing excellent corrosion resistance in humid environments, water treatment systems, and general chemical media.

Integral Forging Structure
The product is manufactured using an integral forging process, resulting in a denser metal structure and continuous fiber flow lines, effectively improving pressure resistance and impact resistance.

Precision CNC Machining
Flange sealing surfaces, bolt holes, and key dimensions are all machined using CNC equipment, strictly controlling dimensional tolerances and surface roughness, improving installation accuracy and sealing reliability, and reducing the risk of media leakage.

Good Weldability
304 and 304L stainless steels have good weldability. The low-carbon 304L version reduces the risk of intergranular corrosion during welding, making it suitable for on-site installation and welding.

International Standards Compatibility
Products can be manufactured according to ASME, EN, DIN, JIS, and GOST standards to meet the procurement needs of engineering projects in different countries and regions.

Chemical and Fine Chemical Plants
Water Treatment and Wastewater Treatment Systems
Food and Beverage Processing Equipment
Pharmaceutical Cleanroom Piping Systems
HVAC Systems
Marine and Marine Engineering
Power and Energy Projects
General Industrial Fluid Transport Systems 

Raw Material Inspection
All raw materials are sourced from vetted and qualified suppliers. Upon arrival at the factory, material certificates are verified, and PMI material verification is performed according to order requirements.

Forging and Shaping
Manufacturing is carried out using die forging or free forging processes to ensure uniform internal structure and dense composition, improving mechanical properties and reliability.

Heat Treatment
Solution heat treatment is performed according to ASTM standards and customer technical specifications to restore the material's corrosion resistance and optimize its microstructure.

Precision Machining
CNC lathes, machining centers, and drilling equipment are used to machine key parts of the flange, ensuring product dimensions meet relevant standards.

Surface Treatment
Pickling and passivation, sandblasting, mechanical polishing, or electropolishing are selected based on application conditions to improve surface quality and corrosion resistance.

Finished Product Inspection
After machining, products undergo dimensional inspection, visual inspection, material verification, and relevant non-destructive testing. Once confirmed to meet order requirements, packaging and shipment are arranged.

Raw Material Traceability: All raw materials are sourced from qualified suppliers and managed by heat number, enabling full traceability from raw material procurement to finished product delivery.

Key Process Control: Process quality control is implemented for key processes such as forging, heat treatment, machining, and surface treatment to ensure consistent product quality.

Finished Product Inspection and Verification: Each batch of products undergoes dimensional inspection, PMI material verification, and visual inspection. UT and PT non-destructive testing services are available upon request.

Third-Party Inspection Support: Factory audits and outgoing inspections by third-party organizations such as SGS, BV, TÜV, DNV, LR, and ABS are supported.

Complete Quality Documentation: EN 10204 3.1/3.2 certificates, MTC material certificates, PMI reports, dimensional inspection reports, and third-party inspection certificates are available.

Material Customization: Supports customization of various stainless steel materials including ASTM A182 F304, F304L, F316/F316L, F321, F347, and duplex stainless steel F51/F53/F55.

Standard Customization: Can be manufactured according to international standards such as ASME B16.5, ASME B16.47, EN1092-1, DIN, JIS, and GOST.

Size Customization: Supports standard sizes, non-standard sizes, and large-diameter flange customization; can be processed and produced according to customer drawings or technical requirements.

Pressure Rating Customization: Supports Class 150–2500 and PN series pressure ratings to meet the needs of different operating conditions.

Flange Type Customization: Can produce various flange structures such as WN, SO, BL, TH, SW, and LJ to achieve project-specific procurement.

Customized Sealing Surfaces: Supports processing of various sealing surfaces including RF, FF, RTJ, TG, and M/F to meet diverse sealing requirements.

Customized Surface Treatments: Provides surface treatment solutions such as pickling and passivation, sandblasting, mechanical polishing, electropolishing, and mirror finishing.

Customized Markings: Supports laser marking of customer logos, material grades, standards, pressure ratings, furnace numbers, and project numbers.

Customized Packaging: Supports fumigation-free plywood crates, pallet packaging, barcode labels, and OEM brand packaging for convenient overseas warehousing and logistics management.

Sealing Surface Protection
All flange sealing surfaces are equipped with plastic protective covers to prevent damage or scratches during transportation.

Moisture-Proof Packaging
Products are packaged in plastic film or bubble wrap, with moisture-proof measures configured according to the transportation cycle.

Export Packaging
Fumigation-free plywood crates or export pallets are used for packaging, meeting international transportation requirements.

International Logistics Support
FOB, CIF, CFR, DDP and other trade terms are supported. Sea freight, air freight and rail transport solutions can be arranged according to the customer's destination port.