Long Neck Flanges -  Carbon Steel & Stainless Steel 

Long neck flanges are engineered to provide superior reinforcement and alignment in high-pressure and high-temperature piping systems. These flanges feature an extended hub that gradually transitions into the pipe wall, reducing stress concentration and ensuring smooth flow transition. Manufactured from high-grade carbon steel (A105, C21, C22.8, EN 10222-2) and stainless steel (A182 F304/F316 and variants with UNS and WSt. numbers conforming to EN 10222-5), these flanges comply with international quality and dimensional standards. They are ideally suited for demanding applications across petrochemical, power generation, refinery, and process industries. Designed for butt-weld connections, these flanges provide excellent structural integrity, corrosion resistance, and compatibility with ANSI and DIN-based piping systems.

Specification:

– Product Type: Long Neck Flange (Weld Neck Extended Hub)
– Connection Type: Butt-weld
– Design Standards: ANSI / ASME B16.5, EN 1092-1 (as applicable)
– Pressure Classes: 150#, 300#, 600#, and higher (as specified)
– Carbon Steel Grades:
 • ASTM A105
 • C21, C22.8
 • EN 10222-2
– Stainless Steel Grades:
 • ASTM A182 F304 (L/H) – UNS S30400 – WSt. 1.4301 – EN 10222-5
 • ASTM A182 F316 (L/H/Ti) – UNS S31600 – WSt. 1.4401 – EN 10222-5
– Surface Finish: Serrated / Smooth / Spiral (as required)
– Temperature Range: Material-dependent (generally up to 538°C for stainless steel)
– Manufacturing Type: Forged
– Applications: Oil & gas, petrochemical, chemical processing, power plants, water treatment
– Testing & Certification: Hydrostatic tested, PMI, EN 10204 3.1 or 3.2 certificates (as required)
– End Prep: Beveled ends for welding
For further specifications or to inquire about this equipment and ReflowX's logistics services, Please contact ReflowX at info@reflowx.com