welding neck flanges WNF

A182 F22 Steel Forged Flanges

Bangdong Supply A182 F51 Flanges,A182 F304L Flanges,A182 F91 Flanges.Early carbon Steel Flange producers employed a manufacturing method called butt-welding. The butt-welding process was quite elementary in that it merely rolled a piece of  heated steel plate into tubular form and created a longitudinal weld through compression and direct heat. When the mill came to the end of a coil, they could simply weld it to the beginning of the next coil with little interruption to production.

THE BASICS OF Steel Flanges

Steel flanges provide an easy access for cleaning, inspection or modification. They usually come in round shapes but they can also come in square and rectangular forms. The flanges are joined to each other by bolting and joined to the piping system by welding or threading and are designed to the specific pressure ratings; 150lb, 300lb, 400lb, 600lb, 900lb, 1500lb and 2500lb.

A flange can be a plate for covering or closing the end of a pipe. This is called a Blind Flange . Thus, flanges are considered to be internal components which are used to support mechanical parts.

MATERIALS

Each flange material is to be considered for its application prior to ordering, this is due to the structural integrity of the application that the flange will be used on.

Copper Nickel Flanges

Currently, the most common materials for flanges are:

Carbon steel
  • ASTM A105/A266 Gr.2 (high temperature carbon steel flanges)
  • ASTM A350 LF1 to LF3 (low temperature carbon steel flanges)
  • ASTM A694 Gr. F42/F52/F56/F60/F65 (high yield carbon steel flanges to match API 5L linepipes)

Alloy Steel

 ASTM A182 Gr. F1/F2/F5/F9/F11 Cl.2/F12 Cl.2/F22 Cl.3/F91 (alloy steel flanges)

Stainless / Duplex Steel
  • ASTM A182 F304/304L, 316/316L, 321, 347, 348 (stainless steel flanges), 904/904L
  • ASTM A182 F51 (duplex flanges)/F53-F55 (superduplex flanges)

Nickel Alloys / Superalloys
  • ASTM B166 UNS NO6600 (Inconel 600)
  • ASTM B564 UNS N06625 (Inconel 625)
  • ASTM B425 UNS-NO8800 (Incoloy 800)
  • ASTM B564 UNS N08825 (Incoloy 825)
  • ASTM B160 UNS N0200 (Nickel 200)
  • ASTM B564 UNS N04400 (Monel 400)
  • ASTM B564 UNS N10276 (Hastelloy C-276)

Titanium
  • ASTM B381 Gr.2 (Titanium)

MEASUREMENTS

Flanges within the same standard can either be flat (commonly cast iron, ductile iron) or raised face (commonly cast steel and stainless steel). These flange tables cover the critical flange dimensions to help identify what standard you have.

Critical flange dimensions help to identify the standard

Pipe Size – Pipe flanges also have a corresponding pipe size, generally according to accepted standards.

Outside Diameter of Flange (OD) – this is measured from outer edge to opposing outer edge.

Pitch Circle Diameter (PCD) – this is a diameter that measures from the center of bolt hole to opposing bolt hole.

Flange Thickness – this measures only the thickness of the attaching outer rim, and does not include the part of the flange that holds the pipe.

DESIGN

Manufacturers are able to custom design flanges to suit the desired requirement, they can include but are not limited to:

  • Weld neck
  • Slip-on
  • Socket Weld
  • Lap Joint
  • Threaded
  • Blind

Spectacle Blind Flange
Stainless Steel Lap Joint Flange
Stainless Steel Plate Flanges
Stainless Steel Threaded Flange
Raised Face Threaded Flange
Stainless Steel Blind Flange
Raised Face Blind Flange
Slip On Pipe Flange

Product Categories : Steel Flange > Flanged Outlet