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ASTM A694 F42 flanges are forged high-strength carbon steel pipe components, which are used for high pressure transmission in petroleum, natural gas or process pipelines. Grade F42 is the minimum entry grade in the ASTM A694 standard family of grades, as specified by governing material properties with a minimum yield strength of 42 ksi (290 MPa). The forged parts provide consistent mechanical properties, high-pressure integrity and high weldability in challenging field applications. A694 F42 is used by pipeline engineers when designs demand greater mechanical properties than those of ASTM A105 carbon steel and excellent ductility and economy. Solitaire Overseas produces and delivers ASTM A694 F42 certified precision dimensional and metallurgical flanges.
| Feature / Parameter | Standard Specification Details |
|---|---|
| Material Specification | ASTM A694 / ASME SA694 Grade F42 |
| Dimensional Standards | ASME B16.5 (1/2" to 24"), ASME B16.47 Series A & B (26" to 48"+), MSS SP-44 |
| Pressure Classes | Class 150, Class 300, Class 400, Class 600, Class 900, Class 1500, Class 2500 |
| Manufacturing Process | Forged, Normalized, 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 (MTR), NACE MR0175 / ISO 15156 compliant upon request |
| Element | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) |
|---|---|---|---|---|---|
| Composition Limit (%) | ≤ 0.30 | ≤ 1.60 | ≤ 0.025 | ≤ 0.025 | 0.15 – 0.35 |
| Grade | Yield Strength, min | Tensile Strength, min | Elongation, min (in 2 inches / 50 mm) |
|---|---|---|---|
| F42 | 290 MPa / 42 ksi | 415 MPa / 60 ksi | 20% |
| Physical Property | Typical Value |
|---|---|
| Density | 7.85 g/cm³ (0.284 lb/in³) |
| Modulus of Elasticity | 190 – 210 GPa (27.5 – 30.5 × 10⁶ psi) |
| Thermal Conductivity | ~45 W/m·K at room temperature |
| Melting Range | 1425 – 1540 °C (2600 – 2800 °F) |
| Service Temp (°F) | Class 150 (psi) | Class 300 (psi) | Class 400 (psi) | Class 600 (psi) | Class 900 (psi) | Class 1500 (psi) | Class 2500 (psi) |
|---|---|---|---|---|---|---|---|
| -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 |
| 600 | 140 | 435 | 580 | 875 | 1310 | 2185 | 3640 |
| 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 F42 Flanges are forged steel flanges used to connect pipes in high-pressure oil and gas transmission systems. Grade F42 has a minimum yield strength of 42 ksi (290 MPa).
The main difference is yield strength. F42 has a minimum yield strength of 42 ksi (290 MPa), while F52 has 52 ksi (360 MPa).
Yes, ASTM A694 F42 Flanges are used in oil and gas pipeline systems where their material strength and specified pressure rating meet the project requirements.
Testing may include chemical analysis, tensile testing, dimensional inspection, and other tests required by the purchase specification. Inspection certificates and third-party inspection may also be available.
Yes, mill test certificates can be supplied when specified in the order. They typically document chemical composition and mechanical test results.
Select the pressure class based on design pressure, operating temperature, flange size, material requirements, and the applicable dimensional standard, such as ASME B16.5 or ASME B16.47.