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ASTM A694 F65 Flanges are steel forged parts that are used to assemble pipeline sections for oil, gas and other fluids in high pressure pipelines. Grade F65 is manufactured to the ASTM A694/A694M specification and has a minimum yield of 65 ksi (450 MPa), ideal for pipeline designs that demand greater material strength. The flanges are required to be used in joining of pipe and other associated equipments, whose size, type of facing and pressure class depends on certain criteria. The chemical, mechanical and dimensional tests are performed to check whether the specified criteria are fulfilled or not. Solitaire Overseas is a manufacturer and supplier of ASTM A694 F65 Flanges in India and is able to serve industrial projects and customers from all over the world.
| Feature | Standard Specification |
|---|---|
| Governing Standard | ASTM A694 / SA694 Grade F65 |
| Dimensional Standards | ASME B16.5 (NPS 1/2 to NPS 24), ASME B16.47 Series A & B (NPS 26 to NPS 60), MSS SP-44 |
| Nominal Pipe Size (NPS) | 1/2" to 48" and larger custom sizes |
| Pressure Classes | Class 150, 300, 400, 600, 900, 1500, 2500 |
| Heat Treatment Condition | Normalized, Normalized and Tempered, or Quenched and Tempered |
| Flange Facings | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Testing & Certification | EN 10204 3.1 Material Test Report, NACE MR0175 / ISO 15156, Hydrostatic Tested |
| Element | Composition Limit (%) |
|---|---|
| Carbon (C) | ≤ 0.30 |
| Manganese (Mn) | ≤ 1.60 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Silicon (Si) | 0.15 – 0.35 |
| Grade | Minimum Yield Strength | Minimum Tensile Strength | Minimum Elongation (2 in.) |
|---|---|---|---|
| F65 | 450 MPa / 65 ksi | 530 MPa / 77 ksi | 20% |
| Physical Property | Typical Value |
|---|---|
| Density | 7.85 g/cm³ |
| Elastic Modulus | 190 – 210 GPa |
| Thermal Conductivity | ~45 W/m·K |
| Typical Melting Range | 1425 – 1540 °C |
| Temperature (°F) | Class 150 (psig) | Class 300 (psig) | Class 400 (psig) | Class 600 (psig) | Class 900 (psig) | Class 1500 (psig) | Class 2500 (psig) |
|---|---|---|---|---|---|---|---|
| -20 to 100 | 275 | 720 | 960 | 1440 | 2160 | 3600 | 6000 |
| 200 | 230 | 600 | 800 | 1200 | 1800 | 3000 | 5000 |
| 300 | 205 | 540 | 720 | 1080 | 1620 | 2700 | 4500 |
| 400 | 190 | 495 | 660 | 995 | 1490 | 2485 | 4140 |
| 500 | 170 | 465 | 620 | 930 | 1395 | 2330 | 3880 |
| 750 | 95 | 415 | 555 | 830 | 1245 | 2075 | 3460 |
| 900 | 50 | 390 | 520 | 780 | 1165 | 1945 | 3240 |
| 1000 | 20 | 320 | 430 | 640 | 965 | 1605 | 2675 |
ASTM A694 F65 Flanges are forged steel flanges used to connect pipes in high-pressure oil, gas, and pipeline transmission systems. They have a minimum yield strength of 65 ksi (450 MPa).
ASTM A694/A694M covers the material and mechanical requirements for F65 flanges. Dimensional requirements are generally covered by standards such as ASME B16.5 and ASME B16.47.
The main difference is yield strength. F65 has a minimum yield strength of 65 ksi (450 MPa), while F60 has 60 ksi (415 MPa).
F65 has a minimum yield strength of 65 ksi (450 MPa), whereas F70 has 70 ksi (485 MPa). F70 provides a higher minimum yield strength.
These flanges are used in oil and gas transmission, offshore production, petrochemical plants, refineries, and natural gas processing facilities.
Yes, they are suitable when their material properties, pressure rating, dimensions, and operating conditions meet the pipeline design requirements.