ASTM A694 is the specialized standard for high-yield carbon and alloy steel flanges, designed for high-pressure transmission in oil and gas pipelines. Grades from F42 to F80 provide superior strength-to-weight ratios compared to standard grades. When specified for cryogenic service, these flanges undergo precise heat treatments and impact testing to maintain ductility in sub-zero environments. The Slip-On design facilitates easy alignment and is secured via double fillet welding for reliable, high-pressure sealing.
technical attributes
Material Grade: ASTM A694 F42 to F80
Standard: ASME B16.5 / MSS SP-44
Flange Type: Slip-On SO
Material Class: High-Yield Carbon Steel
Pressure Class: 150 to 2500 LBS
Size Range: NPS 1/2 to NPS 60
Min Yield Strength: 290 to 550 MPa
Tensile Strength: 415 to 655 MPa
Impact Test Temp: -46C for Low Temp
Impact Energy: Min 27 Joules Average
Heat Treatment: Normalized or Quenched
Carbon Content: Max 0.26 percent
Manganese Content: Max 1.60 percent
Hardness: Max 197 HBW
Facing Type: Raised Face RF or RTJ
Manufacturing: Forged and Machined
Connection: Double Fillet Weld
Certification: EN 10204 3.1
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