A carbon steel flange is one of the most commonly used pipe fitting, Carbon steel flanges are utilized when pipe joints need disassembling for maintenance or other purposes. In a way, use of flange offers more adaptability to a piping system. Carbon steel flanges are used to connect the pipe with different types of fittings, pipes and valves. A flange is generally used along with related gaskets and nut bolts. Special attention needs to be placed, for selection of type of flange and the materials, to ensure 100% leak proof piping framework.

flange is an external or internal ridge, or rim (lip), for strength, as the flange of an iron beam such as an I-beam or a T-beam; or for attachment to another object, as the flange on the end of a pipe, steam cylinder, etc., or for a flange of a rail car or tram wheel. Thus flanged wheels are wheels with a flange on one side to keep the wheels from running off the rails. The term “flange” is also used for a kind of tool used to form flanges.  The type of flange to be used for a piping application depends, mainly, on the required strength for the flanged joint. Flanges are used, alternatively to welded connections, to facilitate maintenance operations – Pipes with flanges can be assembled and disassembled easily. The flange is the second most used joining method after welding. A flanged joint is composed of three separate and independent although interrelated components; the flanges, the gaskets, and the bolting; which are assembled by yet another influence, the fitter.

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Alloy Steel Flanges ASTM/ASME SA/A182 F1, F5, F9, F11, F22, F91
Stainless Steel Flanges ASTM/ASME A182 F304, A182 F304L, A182 F304H, A182 F316, A182 F316L, A182 F316H, A182 F317, A182 F317L, A182 F321, A182 F321H, A182 F347, A182 F51, A182 F53
Duplex and Super Duplex Flanges ASTM A 182 F51/ UNS S31803, F53/UNS S32750, F55/UNS S32760
Most Common Grade Carbon Steel Flange ASTM/ASME SA/A105, 105N
Low Temperature Carbon Steel Flanges ASTM/ASME SA/A350 LF1, LF2, LF3
High Yield Carbon Steel Flanges ASTM/ASME SA/A694 F42, F52, F60, F65, F70
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Types of Carbon Steel Flanges

  • ASTM A 105, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, ASTM A 694 F42, F46, F52, F56, F60, F65, F70
  • Carbon steel welding neck flanges, Carbon steel slip on flanges, Carbon steel socket weld flanges, Carbon steel lap joint flanges, Carbon steel threaded flanges and Carbon steel blind flanges, etc.

International Standards

Design According to EN Type According to DIN
Weld Neck Flange Type 11 DIN 2627 – DIN 2638
Blind Flange Type 05 DIN 2527
Threaded Flange Type 12 DIN 2558, DIN 2565 – DIN 2569
Flat Flange Type 01 DIN 2573, DIN 2576
Lapped Flange Type 02 & Type 04 DIN 2641, DIN 2642, DIN 2655, DIN 2656

Similar to ASME flanges, EN1092-1 steel and stainless flanges, have several different versions of raised or none raised faces. According to the European form the seals are indicated by different form:

Form: types of Contact Faces DIN EN 1092-1
Without Raised Face Form A
Raised Face (Rz = 160 Mechanical Turned) Form B1
Raised Face ( Rz = 40 Mechanical Turned) Form B1
Raised Face (Rz = 16 Mechanical Turned) Form B2
Tongue According to DIN2512 Form C
Groove According to DIN 2512 Form D
Male According to DIN 2513 Form E
Female According to DIN 2513 Form F
Female According to DIN 2514 Form G
Male According to DIN 2514 Form H

Types of Flanges

A flange can be characterized and classified in various ways such as:

-Types of Connection
-Flange facing Types
-Pressure Temperature Ratings
-Material Types

Anchor Flanges Long Weld Neck Flanges
Blind Flanges Orifice Flanges
Expander Flanges Welding Neck Flanges
High Hub Flanges Ring Type Joint Flanges (RTJ)
Lap Joint Flanges Plate Flanges
Spades & Ring Spacers Threaded Flanges
Reducing Flanges Slip On Flanges
Socket Weld Flanges Spectacle Blind Flanges
Square Flanges Nipoflanges