ASTM A182 chrome-moly alloy steel Weld Neck (WN) flanges are engineered for high-temperature and high-pressure applications. Grades F5, F9, F11, and F22 offer varying levels of chromium and molybdenum for creep resistance and strength in refineries. F91 is a creep-strength-enhanced ferritic (CSEF) alloy for ultra-critical power plants. The tapered hub design ensures uniform stress distribution, preventing fatigue at the weld joint during thermal cycling in harsh steam or hydrocarbon service.
Technical Attributes: ASTM A182 Alloy WN
Material Standard,ASTM A182 / ASME SA182
Flange Type,Weld Neck (WN)
Alloy F5,"5% Cr, 0.5% Mo (Refinery use)"
Alloy F11,"1.25% Cr, 0.5% Mo (Power/Steam)"
Alloy F22,"2.25% Cr, 1% Mo (High Pressure)"
Alloy F91,"9% Cr, 1% Mo, V, Nb (Supercritical)"
Pressure Class,150# to 2500#
Size Range,NPS 1/2" to 60"
Heat Treatment,Normalized & Tempered (NT) / Quenched
Weld Prep,37.5° Bevel (Butt-weld)
Bore,Must match pipe Schedule (SCH)
Facing,RF (Raised Face) or RTJ (Ring Joint)
Tensile (F22),Min. 485 MPa
Yield (F22),Min. 310 MPa
Temp Range,Up to 650°C (Material dependent)
Corrosion Res.,Oxidation & Creep resistant
Hardness (F91),190 to 248 HBW
Certification,EN 10204 3.1 with NDT reports
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
