Alloy Steel Flanges

Alloy Steel Flanges

Manufacturer, Supplier & Exporter

Emirerri Steel is a leading manufacturer and supplier of high-quality Alloy Steel flanges, engineered for strength, durability, and reliability in demanding industrial applications. Alloy steel flanges offer superior mechanical properties compared to carbon steel, including excellent toughness, wear resistance, and the ability to withstand high-pressure and high-temperature environments.

These flanges are widely used in oil & gas, petrochemical, chemical, power generation, and water treatment industries, where performance, safety, and longevity are critical.

Key Features 

  • High mechanical strength for use in high-pressure and high-temperature systems.

  • Excellent toughness and wear resistance under extreme operating conditions.

  • Good corrosion resistance, suitable for moderately corrosive environments.

  • Precise dimensional accuracy ensuring proper fit and leak-proof connections.

  • Available in various pressure classes and sizes to suit industrial piping requirements.

  • Easy to weld, fabricate, and maintain for long-term reliability.

Alloy Steel Flange

Types of Alloy Steel Flanges

Emirerri Steel provides a wide range of alloy steel flanges to meet different piping and industrial needs:

  • Weld Neck Flanges (WN): Designed for high-pressure systems, welded directly to the pipe.

  • Slip-On Flanges (SO): Easy to align and install; suitable for moderate-pressure pipelines.

  • Blind Flanges (BL): Used to seal the end of pipes or vessels.

  • Socket Weld Flanges (SW): For small-diameter, high-pressure piping systems.

  • Threaded (Screwed) Flanges (TH): Non-welded connection suitable for moderate-pressure systems.

  • Lap Joint Flanges (LJ): Used with stub ends for systems requiring frequent dismantling.

  • Ring Type Joint (RTJ) Flanges: Metal-to-metal seal for critical high-pressure applications.

  • Spectacle Blind Flanges: Combine a blind and spacer flange for pipeline isolation and maintenance.

Alloy Steel Grades & Standards

Common Alloy Steel Grades:
Standards Compliance:
  • ASTM A182 / ASME SA182

  • ASME B16.5

  • ASME B16.47

  • EN 1092-1 & DIN Standards

Flange Ratings / Pressure Classes

ASME/ANSI B16.5 Formula
PT = (Pr x SI) / 8750
  • PT = rated working pressure in psig for specified material at temperature T.
  • Pr = Pressure rating as per Class in Psig.
  • SI = Selected stress in Psig for specified material at Temperature T.
  • Refer to ASME B16.5 Annex B for the detailed calculation of Pressure Ratings.
Flanges pressure rating in psig for common carbon steel ASME flanges
( A105 / A350 LF2 / A350 LF3 / A350 LF6)
Temperature (F°)150#300#400#600#900#1500#2500#
-20 to 1002857409851480222037056170
2002606809051360203533955655
3002306558701310196532705450
4002006358451265190031705280
5001706058051205181030155025
6001405707551135170528404730
6501255507301100165027454575
7001105307101060159026554425
750955056751015152025354230
80080410550825123520553430
8506532042564095515952655
9005023030546069011501915
950351351852754106851145
10002085115170255430715

 

Face Types

  • Flat Face (FF)
  • Raised Face (RF)
  • Ring Type Joint (RTJ)

Sizes and Pressure Classes

  • Nominal Pipe Size (NPS): ½” to 48”

  • DN Range: DN15 to DN1200

  • Flange Ratings: Class 150, 300, 400, 600, 900

  • DIN/EN Ratings: PN6, PN10, PN16, PN25, PN40

Applications

  • Oil & Gas Industry

  • Chemical & Petrochemical Plants

  • Power Generation

  • Water & Wastewater Treatment Plants

  • Shipbuilding & Marine Applications

  • General Industrial Applications

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