Forged Stainless Steel Blind Flange ASME B16.47 Series B Class 300 RF for Industrial Piping

Our stainless steel blind flanges are manufactured to ASME B16.47 Series B Class 300 specifications, designed for large-diameter piping system terminations in industrial applications. Forged from ASTM A182 stainless steel grades including F304, F304L, F316, F316L, F321, and Duplex F51/F53, these blind flanges provide outstanding pressure containment and corrosion resistance. The raised face (RF) sealing surface ensures reliable gasket seating for leak-free operation at rated pressure levels.

• ASME B16.47 Series B Compliant: Specifically designed for large-diameter applications (NPS 26 through NPS 60), meeting the dimensional requirements of ASME B16.47 Series B standards with precise bolt circle and flange thickness specifications
• Multi-Grade Material Availability: Available in ASTM A182 F304/F304L (standard 18-8 stainless), F316/F316L (molybdenum-bearing for enhanced pitting resistance), F321 (titanium-stabilized for high-temperature service), and Duplex F51/F53 for extreme corrosion environments
• Forged Construction: Hot-forged manufacturing ensures dense grain structure with no internal voids, providing mechanical properties far exceeding cast or plate-cut alternatives
• Class 300 Pressure Rating: Engineered for medium to high-pressure service with full compliance to pressure-temperature ratings per ASME B16.5 and B16.47 standards
• Full Documentation Package: Each shipment accompanied by material test certificates (EN 10204 3.1), dimensional inspection reports, and Certificates of Origin for customs clearance

With decades of combined global export expertise, we have established reliable logistics channels to over 50 countries worldwide. Our export capabilities include comprehensive documentation management covering commercial invoices, packing lists, bills of lading, Certificates of Origin (Form A, Form E, or Form F depending on destination), and fumigation certificates.

We package all large-diameter blind flanges in ISPM 15 certified fumigated plywood cases with VCI (Volatile Corrosion Inhibitor) anti-corrosion paper to protect machined surfaces during long-distance ocean transit. Our freight forwarding partnerships with major carriers ensure competitive shipping rates and on-time delivery to major ports globally.

Our manufacturing flexibility enables comprehensive OEM and brand customization services. We accommodate non-standard sizes, custom bolt-hole drilling patterns, and specialized face finishes beyond standard specifications.

Brand customization options include permanent laser marking or stamping of your company logo, heat number, material grade, and part number directly onto the flange body. Custom packaging solutions with your brand artwork on plywood cases and pallet labels are fully supported. Our engineering team is available to consult on custom flange designs for unique piping system requirements and non-catalog specifications.

• Petrochemical refinery piping manifold closures
• Offshore oil and gas platform high-pressure isolation
• Power generation plant boiler feedwater system ends
• LNG terminal cryogenic piping blind-off points
• Large-diameter water treatment and desalination piping
• Chemical processing reactor pressure vessel closures
• Pulp and paper mill high-pressure steam line terminations

Every blind flange undergoes rigorous quality inspection in our ISO 9001:2015 certified facility. Our inspection protocol includes: positive material identification (PMI) using XRF spectroscopy on each heat of raw material, dimensional verification with calibrated instruments per ASME tolerance tables, visual inspection for surface defects per MSS SP-55, and hydrostatic pressure testing when specified.

Third-party inspection agencies including SGS, Bureau Veritas, TUV Rheinland, and Lloyd's Register are welcome to witness testing at any stage of production.