ASTM A182 F5 Alloy Steel Orifice Flange Forged WNRF Flange for Industries
An orifice flange is commonly used to measure the flow of fluids. The flange features a couple of bolt holes for attachment to a pipe or another flange. It is also machined to accept an orifice plate, which is used to restrict flow and create a pressure drop that can be measured. This type of flange facilitates flow measurement via an orifice plate, which creates a pressure differential for flow rate calculation. Includes pressure tapings (upstream/downstream) and jack screws for plate installation. Weld neck means the flange has a long tapered hub that can be welded to a pipe, which is good for high-pressure/temperature applications.
ASTM A182 F5 Alloy Steel Flange Chemical Composition
| Grade | C | Mn | Si | S | P | Cr | Mo |
| A182 F5 | 0.15 | 0.3 – 0.6 | 0.5 | 0.03 | 0.03 | 4 – 6 | 0.044 – 0.65 |
ASTM A182 F5 Alloy Steel Flange Mechanical Properties
| Grade | Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation % |
| A182 F5 | 275 | 485 | 20 |
Detailed Manufacturing Process
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Forging: Heated to ~1200°C (2192°F), shaped via closed-die forging for grain refinement.
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Heat Treatment:
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Normalizing: Heated to 900–950°C (1652–1742°F), air-cooled to refine microstructure.
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Tempering: Reheated to 650–700°C (1202–1292°F), then air-cooled to relieve stresses and enhance toughness.
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Machining: CNC-machined to ASME B16.5 tolerances (e.g., bore diameter ±0.8 mm, face flatness <0.2 mm).
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Surface Finish: Raised face (RF) serrations (125–250 µin RMS) for optimal gasket sealing.
Flanges Grades
Stainless Steel Flange: F304, F304L, F304H, F316, F316L, F316Ti, F310, F310S, F321, F321H, F317, F317L, F347, F347H, F904L etc
Duplex Steel Flange: UNS S31803, 2205, S31254 (254SMO)
Super Duplex Steel Flange : UNS S32750, UNS S32760, UNS S32304, S31500
Carbon Steel Flange: ASTM A105, A105N etc.
Alloy Steel Flange: F1, F11, F22, F5, F9, F91 etc.
Nickel Alloy Flange as below
Monel 400 & K500,
Inconel 600, 601, 617, 625, 690, 718, X-750.
Incolloy 800, 800H, 800HT, 825, 925.
Hastelloy C22, C4, C276, S, C2000, G-30, G-35, X, N, B, B-2, B-3.
Copper Alloys Flanges: Copper, Brass & Gunmetal
Industry-Specific Applications
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Oil & Gas: Metering crude oil in high-pressure pipelines (e.g., API 14.3/AGA-3 standards).
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Power Generation: Steam flow measurement in turbines (ASME PTC 6 compliant).
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Petrochemical: Ethylene/cracker unit feed lines (resists hydrogen embrittlement).
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Nuclear: Auxiliary cooling systems (ASTM A182 F5 is not for primary loops but used in secondary circuits).
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ASTM A182 F5 Alloy Steel Flange ASME B16.5 Forged Orifice Weld Neck Flange Images
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