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ASTM A182 F5 Alloy Steel Weld Neck Flange Forged WNRF Black Coated

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ASTM A182 F5 Alloy Steel Weld Neck Flange Forged WNRF Black Coated

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Brand Name : YUHONG

Model Number : ASTM A182 F5 Alloy Steel WNRF Flange

Certification : ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008

Place of Origin : CHINA

MOQ : 1PC

Payment Terms : L/C,T/T

Delivery Time : 7 DAYS

Packaging Details : Ply-wooden Case / pallet

Product Name : Alloy Steel Flange

Dimensions : ANSI Flange, ASME Flange, BS Flange, DIN Flanges, EN Flange

Standard : ASTM A182 / ASME SA182

Material : F5, F9, F11, F12, F22, F91

OD : 1/2" to 48"

Class : 150# 300# 600# 900# 1500#

WT : Sch 5S to Sch XXS

Surface : FF, RF, RTJ

Type : Orifice Flange, Slip-on, Blind, Weldneck, Long Weldneck, SW Flange

High Light : ASTM A182 F5 Alloy Steel Flange, ASME B16.5 Forged WNRF Flange

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ASTM A182 F5 Alloy Steel Forged Flange B16.5 WNRF Flange for Industries

ASTM A182 F5 WNRF Flange refers to the Weld Neck Raised Face flange, a design where the flange neck is welded to the pipe, and the sealing surface is slightly elevated (raised face) to enhance gasket compression and leak prevention. It is a specialized component used in high-temperature and high-pressure piping systems. Manufacturing Process--Produced via forging, ensuring superior structural integrity compared to cast alternatives. Conforms to ASME B16.5 for dimensions and pressure ratings (Class 150–2500).

Comparison with Similar Grades

  • ASTM A182 F5 vs. F9/F11:

    • F9: Higher chromium (8–10%) for better oxidation resistance at extreme temperatures.

    • F11: Similar to F5 but with added vanadium for enhanced creep strength .

  • ASTM A105 vs. A182 F5: A105 (carbon steel) is cheaper but unsuitable for high-temperature applications above 425°C (800°F) .


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

  • Forging: Heated to ~1200°C (2192°F), shaped via closed-die forging for grain refinement.

  • Heat Treatment:

    • Normalizing: Heated to 900–950°C (1652–1742°F), air-cooled to refine microstructure.

    • Tempering: Reheated to 650–700°C (1202–1292°F), then air-cooled to relieve stresses and enhance toughness.

  • Machining: CNC-machined to ASME B16.5 tolerances (e.g., bore diameter ±0.8 mm, face flatness <0.2 mm).

  • Surface Finish: Raised face (RF) serrations (125–250 µin RMS) for optimal gasket sealing.


Installation and Maintenance

  • Alignment: Weld neck flanges require precise alignment during welding to avoid stress concentration.

  • Bolt Tightening: Use ASME PCC-1 guidelines for bolt torque sequences to ensure even gasket compression .

  • In-Service Monitoring: Regular inspections for signs of creep, cracking, or pitting in high-temperature/pressure systems .


Industry-Specific Applications

  • Oil & Gas: Metering crude oil in high-pressure pipelines (e.g., API 14.3/AGA-3 standards).

  • Power Generation: Steam flow measurement in turbines (ASME PTC 6 compliant).

  • Petrochemical: Ethylene/cracker unit feed lines (resists hydrogen embrittlement).

  • Nuclear: Auxiliary cooling systems (ASTM A182 F5 is not for primary loops but used in secondary circuits).



ASTM A182 F5 Alloy Steel Weld Neck Flange Forged WNRF Black Coated


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