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Steel Pipe Flange

Flange Type: Welding Neck/Blind/Socket Weld/Lapped Joint/Slip-on/Plate Flange
Standard: ANSI/ASME B 16.5, DIN, JIS, AWWA, API, ISO etc.
Carbon Steel --- ASTM A105,ASTM A350 LF1,LF2,LF3,A36,ASTM A234 WPB
                  Stainless Steel --- ASTM A403 F304/304L, 316/316L,316Ti,321,317L,310S
                  Alloy Steel --- ASTM A234 WP1/5/9/11/12/22/91
Specification: NPS from 1/2'' to 24'', CLASS from 150 to 2500
Surface: Light Oiling/Black Painting
Packing: Packed in Wood Cabins/ Wood Tray

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Steel Pipe Flange Standard and Specification
Flange standard includes ASA / ANSI / ASME (USA), PN / DIN (European), BS10 (British / Australian), and JIS / KS (Japanese/Korean). In most cases, different flange standards are not interchangeable. For example, an ANSI/ASME flange can not be mate against a JIS flange. However, in real worldworld application, the flange standards are designed to have standardised dimensions so as to allow easy functionality and interchangeability. Flange Specification are determined by the size of the connecting pipes and the pressure class required for the application situation.
JIS Flange Specification Chart Download
DIN Flange Specification Chart Download
ANSI/ASME Flange Specification Chart Download

Pipe Flange Standard and Technical Data
- ASTM A105 is the standard specification for carbon steel forgings for piping applications. This specification covers forged carbon steel piping components for ambient and higher temperature service in pressure systems. Included are flanges, fittings, valves, and similar parts ordered either to dimensions specified by purchaser or to dimensional standards. 
- ASTM A182 is the standard specification for forged or rolled alloy and stainless steel pipe flanges, forged fittings, and valves and parts for high temperature services. This specification covers forged low alloy and stainless steel piping components for use in poressure systems. Include are flanges, fittings, valves, and similar parts to specified dimensions or to dimensional standards. 
- ASTM A234 WPB is the standard specification for piping fittings of wrought carbon steel and alloy steel for moderate and high temperature service.

Pipe Flange Surface Processing
- For Carbon Steel Flange, the surface can be electro galvanized, light oiled and black painted. 
- For Stainless Steel Flange, the surface can apply color bleaching treatment, mirror-bright surface treatment and surface shading. 

cs pipe flange black painted  cs pipe flange black painted ss pipe flange mirror bright treatment ss pipe flange mirror bright treatment

Pipe Flange Pakaging Standard
- Each flange should be stored and packed separately based on material types to avoid electrochemical effects. 
- Use wood, straw or plastics to reduce unexpected damage from transportation.
- The wood cabin or wood tray should be dry to prevent rusting.

pipe flange package pipe flange package 2 pipe flange package 3 pipe flange package 4

Steel Pipe Flange Using Advantages
Pipe Flange is one kind of pipe fittings interconnected between the tube, pipe ends and pipe parts. Also, it is used for connecting devices, such as reducer flange. Flange connection is a detachable connection seal structure combined by flange, gaskets and bolts. Flanges are used in pairs. Low pressure pipe can use threaded flanges. Welding flanges are used when pressure higher than four kilograms. Different flange thickness has different pressures, and need to use different bolts. Flange has a good overall performance, so it is widely used in chemical, construction, water supply, drainage, oil, light and heavy industrial, refrigeration, sanitation, plumbing, fire, electricity, aerospace, shipbuilding and ohter infrastructure projects. 

carbon steel pipe flanges

Flange Type

Flange Application

Flange Photos

Welding Neck Flange

Widely used for high pressure or temeprature flucturations pipeline or high/low temperature piping with 
a nominal pressure less than 2.5 MPa. Also used for pipeline transporting with expensive, flammable, and 
explosive media by a nominal PN 16 MPa. The Thickness of WN Flange: 12mm~58mm. The Outerside 
Diametr of Bore Hole: 11mm~30mm. The Number of Bore Hole: 4~48. Threading: M10~M27.

ss welding neck flange

Blind Flange

Blind Flange also called flange cover which is a type of flange without holes in the middle. It is used for 
pipes sealed as plug. The production process can be divided into forging, casting, and cutting. The 
types of sealing surface including flat, convex, concave convex, tongue, groove, and ring joint.

ss blind flange

Socket Weld Flange

Type of flange connect with welded steel pipe with bolts. It is commonly used in PN less than 10.0 
MPa and DN less than 40 pipeline. The sealing surface type including raised face, uneven surface, 
tongue and groove, ring joint face. The conection type including flange nuts and bolts. Socket Weld 
Flange is widely used for boiler, pressure vessel, petroleu, chemical, shipbuilding etc.

ss socket weld flange

Lapped Joint Flange

Lap Joint Flange also named Loose Flange. The flange is fastened at the pipe end by steel ring, so 
the active flange is not in contact with the medium within the pipeline. 

ss lap joint flange

Slip-on Flange

Slip-on Flange is applied for relatively low pressure flucturaltion, vibration and shock pipeline.The flange 
welding assembly is easy. Only need to insert the pipe into the flange hole to the appropriate location, 
and then take welding. Since it is widely applied, the price for slip on flange is relatively cheap.

ss slip on flange

Threaded Flange

Threaded Flange is processed the flange hole with pipe threading, so the flange and pipe can be 
conect matching without welding. It is a type of non-welded flange. The installation and maintenance 
is simple and easy. It is widely used in the non-welding situation. However, threaded flange is not allowed 
to use when the pipeline temperature is unstable, lower than 45 degree, or higher than 260 degree.

ss threaded flange

Plate Flange


ss plate flange