ASTM A671 is a specification established by the American Society for Testing and Materials (ASTM), governing the production of electric-fusion-welded (EFW) steel pipes manufactured from carbon and carbon-manganese steels. These pipes are primarily intended for applications involving high temperatures and pressures, serving as conduits for fluids within various industrial processes. The designations CC60, CC65, and CC70 denote distinct strength levels of carbon steel pipes encompassed by this specification. Grade CC60 pertains to carbon steel pipes possessing a minimum tensile strength of 60,000 psi (415 MPa). These pipes are well-suited for applications necessitating moderate to elevated pressures and temperatures. In contrast, Grade CC65 pipes exhibit a minimum tensile strength of 65,000 psi (450 MPa). These pipes are engineered to accommodate heightened temperatures and pressures, finding utility in scenarios demanding increased mechanical robustness. Lastly, Grade CC70 signifies the highest strength category among the three, featuring a minimum tensile strength of 70,000 psi (485 MPa). These pipes are tailored for applications requiring exceptional strength, as well as resistance to both pressure and temperature fluctuations.
Functioning through the Electric-Fusion-Welded (EFW) manufacturing process, these pipes are fabricated using an electric arc to create a weld between the edges of steel strips or plates. This technique guarantees a resilient and enduring bond. Metal Tubular serves as a supplier for ASTM A671 Grade CC60, CC65, and CC70 carbon steel EFW pipes. In this role, they likely offer a range of pipe sizes, lengths, and specifications to accommodate the unique requirements of diverse industries and applications. It is crucial to collaborate with reputable suppliers to ensure the quality, adherence, and performance of the supplied pipes, particularly when applied in critical situations involving elevated pressure and temperature conditions.
When procuring these pipes from Metal Tubular or any comparable supplier, it is advisable to take into account various factors. These include confirming the pipes' compliance with relevant ASTM specifications, obtaining pertinent material test certificates, and verifying their alignment with industry standards and regulations, particularly within sectors such as oil and gas, petrochemicals, or power generation. Additionally, assessing size, specification options, and material traceability is recommended to ensure suitability. Reputable suppliers often provide technical support to aid in the selection of appropriate materials for specific applications. Comparative analysis of pricing and delivery timelines from different suppliers enables an informed decision aligned with budgetary considerations and project schedules. By conscientiously considering these aspects, the ASTM A671 Grade CC60, CC65, and CC70 carbon steel EFW pipes procured from Metal Tubular or similar sources can be relied upon to effectively meet the demands of the project at hand.
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Specification:
| Grade | Minimum Tensile Strength |
| CC60 | 60,000 psi (415 MPa) |
| CC65 | 65,000 psi (450 MPa) |
| CC70 | 70,000 psi (485 MPa) |
Chemical Composition of ASTM A 671 Grade CC60 / CC65 / CC70 Carbon Steel EFW Pipes.
| Element | Grade CC60 | Grade CC65 | Grade CC70 |
| Carbon (C) | 0.21 | 0.24 | 0.27 |
| Silicon (Si) | 0.13 - 0.45 | 0.13 - 0.45 | 0.13 - 0.45 |
| Manganese (Mn) | 0.79 - 1.30 | 0.79 - 1.30 | 0.79 - 1.30 |
| Phosphorus (P) | 0.025 | 0.025 | 0.025 |
| Sulfur (S) | 0.025 | 0.025 | 0.025 |
| Nickel (Ni) | 0.40 | 0.40 | 0.40 |
| Chromium (Cr) | 0.25 | 0.25 | 0.25 |
| Molybdenum (Mo) | 0.08 | 0.08 | 0.08 |
| Vanadium (V) | 0.02 | 0.02 | 0.02 |
| Copper (Cu) | 0.50 | 0.50 | 0.50 |
Mechanical Properties of ASTM A 671 Grade CC60 / CC65 / CC70 Carbon Steel EFW Pipes.
| Property | Grade CC60 | Grade CC65 | Grade CC70 |
| Tensile Strength (ksi) | 60 | 65 | 70 |
| Tensile Strength (MPa) | 415 | 450 | 485 |
| Yield Strength (ksi) | 32 | 35 | 40 |
| Yield Strength (MPa) | 220 | 240 | 275 |
| Elongation (%) | 24 | 22 | 20 |
Advantages of ASTM A 671 Grade CC60 / CC65 / CC70 Carbon Steel EFW Pipes.
- Good general corrosion resistance and high strength
- Good sulfide stress corrosion resistance
- Resistance to chloride pitting and crevice corrosion
- Higher resistance to chloride stress corrosion cracking
- Easy to weld and conform
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