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Understanding ASTM A860 WPHY65 and ASTM A694 F65 Pipe Fittings with -46°C Impact Testing
In a recent order from our Singaporean client, Haihao Group received a request for pipe fittings made from ASTM A860 WPHY65 and ASTM A694 F65 materials, with the requirement to perform impact testing at -46°C. This article provides an in-depth look at the chemical composition, mechanical properties, and the significance of low-temperature impact testing for these materials.
Barred Tees SCH80 Bevel Ends ASTM A860 WPHY65
1.Overview of ASTM A860 WPHY65 and ASTM A694 F65
Both ASTM A860 WPHY65 and ASTM A694 F65 are high-strength low-alloy steels commonly used in high-pressure piping systems, particularly in oil and gas, petrochemical, and offshore applications. These materials are well-known for their excellent strength, toughness, and weldability.
Chemical Composition (% by weight, typical values)
| Element | ASTM A860 WPHY65 | ASTM A694 F65 |
| Carbon (C) | ≤ 0.20 | ≤ 0.23 |
| Manganese (Mn) | 1.00 – 1.45 | 1.60 max |
| Phosphorus (P) | ≤ 0.025 | ≤ 0.025 |
| Sulfur (S) | ≤ 0.015 | ≤ 0.015 |
| Silicon (Si) | 0.15 – 0.40 | 0.10 – 0.35 |
| Nickel (Ni) | ≤ 0.50 | ≤ 0.50 |
| Chromium (Cr) | ≤ 0.30 | ≤ 0.30 |
| Molybdenum (Mo) | ≤ 0.25 | ≤ 0.12 |
| Vanadium (V) | ≤ 0.10 | ≤ 0.08 |
These compositions ensure that the materials have enhanced strength, impact resistance, and corrosion resistance.
2.Mechanical Properties
| Property | ASTM A860 WPHY65 | ASTM A694 F65 |
| Tensile Strength (MPa) | ≥ 515 | ≥ 515 |
| Yield Strength (MPa) | ≥ 450 | ≥ 450 |
| Elongation (%) | ≥ 21 | ≥ 21 |
| Hardness (HB) | ≤ 235 | ≤ 235 |
These properties make the materials suitable for high-pressure applications where both strength and ductility are required.
ASME B16.5 ASTM A694 GR.F65 weld neck flange
3.Importance of Low-Temperature Impact Testing (-46°C)
Since these pipe fittings will be used in low-temperature environments, the customer requires Charpy V-Notch Impact Testing at -46°C to ensure that the material retains its toughness and resistance to brittle fracture under extreme cold conditions.
Why is impact testing at -46°C important?
Prevents brittle fracture: Low temperatures can make steel more susceptible to brittle failure. Testing ensures the material can withstand mechanical loads without cracking.
Ensures safety in extreme environments: Applications in offshore, cryogenic, and Arctic conditions demand materials that can maintain ductility and toughness.
Compliance with industry standards: Standards such as API, ASME, and NACE MR0175 require low-temperature impact testing for materials used in critical piping systems.
Haihao Group ensures that all pipe fittings meet or exceed industry standards, including ASTM A860 WPHY65 and ASTM A694 F65 impact-tested at -46°C. By maintaining strict quality control and rigorous testing procedures, we guarantee that our products are safe, reliable, and suitable for extreme environments.
For more information on our high-strength pipe fittings and testing capabilities, feel free to contact us! Email:sales@haihaogroup.com