Nickel Alloy Raised Face Flange

Raised face flanges (RF flanges) are the most widely used flange type in industrial piping systems, with a raised sealing surface that achieves sealing through gasket compression. The nickel alloy raised face flanges supplied by us are manufactured from high-quality nickel-based alloy forgings through multiple processes including forging, solution heat treatment, precision machining, drilling, and pickling/passivation. Featuring high sealing surface flatness, uniform gasket compression, excellent corrosion resistance, and suitability for various pressure classes, they are the ideal choice for pipe connections in demanding applications such as petrochemical, offshore engineering, nuclear power energy, and pharmaceutical food industries.

Flange Types:

1. Welding Neck Flange: Butt-welded to pipe, optimal stress distribution
2. Slip-On Flange: Slides onto pipe end for welding, easy installation
3. Socket Weld Flange: Pipe inserted into socket for welding, suitable for small diameter high pressure
4. Threaded Flange: Threaded connection, no welding required
5. Lap Joint Flange: Used with stub end, easy disassembly
6. Blind Flange: Closing pipe ends or equipment openings

Supply Range

Nominal Diameter (DN/NPS): DN15 – DN600 (1/2 inch – 24 inches); Larger sizes up to DN1500 negotiable

Pressure Class: Class 150, 300, 600, 900, 1500, 2500 (ASME)

Raised Face Height: Class 150-300: 1.6mm; Class 400-2500: 6.4mm

Surface Roughness: Sealing surface Ra 3.2μm – 6.3μm (Ra 1.6μm available upon request)

Surface Condition: Machined, Pickled optional

Marking: Steel stamp marking on flange outer edge, conforming to MSS SP-25 or customer requirements

Dimensional Inspection

1. Overall Dimensions: Measuring all critical dimensions using calipers, micrometers, tape measures
2. Sealing Surface: Inspecting raised face diameter, height, flatness, roughness
3. Hub Transition: Inspecting taper and radius
4. Bolt Holes: Inspecting hole diameter, bolt circle, hole position
5. Bevel: Inspecting bevel angle, root face dimensions

Appearance Inspection

1. Sealing Surface: No scratches, no pits, no rust

Surface Quality: Visual inspection, no cracks, folds, laps, or other