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 FeaturesÂ
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.
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:
ASTM A182 F9
ASTM A182 F22
Alloy Steel A105
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 100 | 285 | 740 | 985 | 1480 | 2220 | 3705 | 6170 |
| 200 | 260 | 680 | 905 | 1360 | 2035 | 3395 | 5655 |
| 300 | 230 | 655 | 870 | 1310 | 1965 | 3270 | 5450 |
| 400 | 200 | 635 | 845 | 1265 | 1900 | 3170 | 5280 |
| 500 | 170 | 605 | 805 | 1205 | 1810 | 3015 | 5025 |
| 600 | 140 | 570 | 755 | 1135 | 1705 | 2840 | 4730 |
| 650 | 125 | 550 | 730 | 1100 | 1650 | 2745 | 4575 |
| 700 | 110 | 530 | 710 | 1060 | 1590 | 2655 | 4425 |
| 750 | 95 | 505 | 675 | 1015 | 1520 | 2535 | 4230 |
| 800 | 80 | 410 | 550 | 825 | 1235 | 2055 | 3430 |
| 850 | 65 | 320 | 425 | 640 | 955 | 1595 | 2655 |
| 900 | 50 | 230 | 305 | 460 | 690 | 1150 | 1915 |
| 950 | 35 | 135 | 185 | 275 | 410 | 685 | 1145 |
| 1000 | 20 | 85 | 115 | 170 | 255 | 430 | 715 |
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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