Stainless Steel Plate Flange Large Bore DN350-DN2000 ASTM A182 F316 ASME B16.47 Series A/B Heavy Duty

Our large bore stainless steel plate flanges covering the DN350 through DN2000 range are engineered for the most demanding large-diameter industrial piping applications. Forged from ASTM A182 F316 and available in multiple stainless and duplex grades, these ASME B16.47 Series A and B compliant flanges provide robust, maintenance-friendly connections for plant-scale piping systems.

From water transmission mains to cooling water headers, large-diameter chemical transfer lines to power plant circulating water systems, our extensive large bore capability ensures single-source supply for your entire project flange requirement.

• DN350-DN2000 Extensive Range: Fifteen standard sizes from 14 inch through 80 inch, providing one of the most comprehensive large bore plate flange ranges available from a single manufacturer
• ASME B16.47 Dual-Series Compliance: Available in both Series A (larger, heavier, higher bolt count) and Series B (more compact, economical) configurations, enabling optimization between strength requirements and cost/weight constraints
• Multi-Grade Material Flexibility: F304, F316, F316L, F321, and Duplex F51/F53 grades available, with each heat of material fully traceable through forging, machining, and final inspection
• Heavy-Duty Forging Capability: In-house large-scale forging presses capable of producing flange blanks up to 2,000mm OD, ensuring material integrity and grain flow optimization for critical large-diameter service
• Complete Documentation Package: Each large bore flange shipment includes MTRs, dimensional reports, PMI certificates, and Certificates of Origin for hassle-free customs clearance

• Municipal water transmission and distribution mains
• Power plant circulating water and cooling tower headers
• Desalination plant brine and product water piping
• LNG terminal large-diameter transfer and loading lines
• Petrochemical plant cooling water supply and return
• Mining and minerals processing tailings and slurry lines
• Wastewater treatment plant influent and effluent headers
• Offshore platform firewater ring main systems
• Hydroelectric plant penstock and draft tube connections

ISO 9001:2015 certified facility. Every large bore flange undergoes PMI, comprehensive dimensional verification per ASME B16.47, visual examination, and NDE as specified (UT of forging, PT of machined surfaces). EN 10204 3.1/3.2 certificates, hydrostatic testing, and third-party witness inspection by SGS, BV, TUV, or Lloyds Register available.