JIS B2220 20K Blind flanges in F51, F53, and F55 represent the high-pressure Japanese standard for duplex and super duplex sealing. These solid "BL" discs are engineered for aggressive marine and chemical environments where 10K ratings are insufficient. Utilizing F53 or F55 Super Duplex ensures maximum resistance to pitting and stress corrosion in chloride-rich media. They provide a high-strength, pressure-tight termination point for offshore platforms and desalination plants requiring extreme durability.
Technical attributes
Standard: JIS B2220
Pressure Rating: 20K
Material Grade: F51 / F53 / F55
Alloy Type: Duplex / Super Duplex
Flange Type: BL (Blind)
Size Range: 10A to 600A
Manufacturing: Forged and Machined
Facing Type: RF (Raised Face)
Yield Strength: Min 450 to 550 MPa
Tensile Strength: 620 to 800 MPa
PREN Value: 34 (F51) to 40+ (F55)
Chromium Content: 21.0 to 26.0 percent
Nickel Content: 4.50 to 8.00 percent
Molybdenum Content: 2.50 to 5.00 percent
Hardness: Max 290 HBW
Microstructure: 50 percent Ferrite / 50 percent Austenite
Certification: EN 10204 3.1
Service Environment: High-Pressure Seawater / Acids
Contact: Jorge Yang
Phone: +86-13588258503
E-mail: sales@fluvalve.com
Whatsapp:+86-13588258503
Add: Room 331, South Building,Building 1, No.3 Jinpeng Street, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province
