ASTM A671 is a standard specification for electric-fusion-welded steel pipe for atmospheric and lower temperatures. This specification covers various grades of pipe used in applications where the operating conditions require higher notch toughness properties. The grades available for ASTM A671 pipe are determined by the chemical composition and mechanical properties of the steel used in their manufacture. Longma will explore the different grades available for ASTM A671 pipe, focusing on CC60, CC65, and CC70, and discuss their characteristics and applications.
CC60
CC60 is one of the most commonly used grades for ASTM A671 pipe. This grade is known for its excellent balance of strength and ductility, making it suitable for a wide range of applications in various industries. The "CC" in CC60 stands for "Carbon Steel," indicating that this grade is made from carbon steel material.
Key characteristics of CC60 grade ASTM A671 pipe include:
1. Chemical Composition: CC60 has a controlled chemical composition, typically with carbon content ranging from 0.18% to 0.23%. Other alloying elements such as manganese, silicon, phosphorus, and sulfur are also present in specified amounts to achieve the desired properties.
2. Mechanical Properties: CC60 grade pipes offer a minimum tensile strength of 60,000 psi (415 MPa) and a minimum yield strength of 35,000 psi (240 MPa). These properties make CC60 suitable for applications requiring moderate strength and good formability.
3. Notch Toughness: CC60 grade pipes are designed to provide improved notch toughness compared to standard carbon steel pipes. This characteristic is particularly important in applications where the pipe may be subject to impact loads or low-temperature service.
4. Weldability: Due to its controlled carbon content and overall chemical composition, CC60 grade pipes generally exhibit good weldability, making them suitable for fabrication and on-site installation.
5. Applications: CC60 grade ASTM A671 pipes are commonly used in various industries, including oil and gas, petrochemical, and power generation. They are suitable for applications such as process piping, transmission lines, and general-purpose structural applications.
CC65
CC65 is another important grade available for ASTM A671 pipe. This grade offers higher strength compared to CC60 while maintaining good ductility and toughness. The "65" in CC65 indicates the minimum tensile strength of 65,000 psi (450 MPa).
Key characteristics of CC65 grade:
1. Chemical Composition: CC65 has a carefully controlled chemical composition, typically with slightly higher carbon content compared to CC60, usually ranging from 0.20% to 0.25%. The amounts of other alloying elements are also adjusted to achieve the desired mechanical properties.
2. Mechanical Properties: CC65 grade pipes offer a minimum tensile strength of 65,000 psi (450 MPa) and a minimum yield strength of 35,000 psi (240 MPa). These properties make CC65 suitable for applications requiring higher strength than CC60, while still maintaining good formability.
3. Notch Toughness: Like CC60, CC65 grade pipes are designed to provide improved notch toughness. This characteristic is crucial for applications where the pipe may be subjected to impact loads or low-temperature service conditions.
4. Weldability: Despite its higher strength, CC65 grade pipes generally maintain good weldability due to their controlled chemical composition. However, welding procedures may need to be adjusted to account for the higher strength of the material.
5. Applications: CC65 grade ASTM A671 pipes are often used in applications requiring higher strength than CC60. They are commonly found in the oil and gas industry, petrochemical plants, and power generation facilities. Typical applications include high-pressure piping systems, transmission lines, and structural components in demanding environments.
CC70
CC70 is the highest strength grade among the three discussed in this article for ASTM A671 pipe. This grade offers superior strength while still maintaining adequate ductility and toughness. The "70" in CC70 indicates the minimum tensile strength of 70,000 psi (485 MPa).
Key characteristics of CC70 grade ASTM A671 pipe include:
1. Chemical Composition: CC70 has a carefully controlled chemical composition with higher carbon content compared to CC60 and CC65, typically ranging from 0.22% to 0.28%. The amounts of other alloying elements are also adjusted to achieve the desired mechanical properties and maintain weldability.
2. Mechanical Properties: CC70 grade pipes offer a minimum tensile strength of 70,000 psi (485 MPa) and a minimum yield strength of 40,000 psi (275 MPa). These properties make CC70 suitable for applications requiring high strength and good resistance to deformation under load.
3. Notch Toughness: Despite its higher strength, CC70 grade pipes are designed to maintain good notch toughness. This characteristic is crucial for applications where the pipe may be subjected to impact loads or low-temperature service conditions, especially in critical infrastructure projects.
4. Weldability: CC70 grade pipes can be welded, but due to their higher strength and carbon content, more careful attention must be paid to welding procedures and parameters. Preheating and post-weld heat treatment may be required in some cases to ensure proper weld quality and maintain the material's properties in the heat-affected zone.
5. Applications: CC70 grade ASTM A671 pipes are used in applications requiring the highest strength among the CC grades. They are commonly found in high-pressure systems in the oil and gas industry, critical components in petrochemical plants, and demanding structural applications in various industries. Typical uses include high-pressure transmission lines, offshore platforms, and heavy-duty structural components.
LONGMA GROUP—ASTM A671 Pipe Manufacturer
When it comes to sourcing high-quality ASTM A671 pipes, LONGMA GROUP stands out as a reputable manufacturer. With a strong commitment to quality and customer satisfaction, LONGMA GROUP offers a comprehensive range of A671 pipes in various grades, including CC60, CC65, and CC70.
LONGMA GROUP's expertise in manufacturing pipes ensures that customers receive products that meet or exceed industry standards. Their state-of-the-art production facilities and rigorous quality control processes guarantee the consistency and reliability of their pipes across all grades.
Key Advantages
1. Extensive inventory: LONGMA GROUP maintains a substantial stock of ASTM A671 pipes, with quantities ranging from 50 to 100 tons. This ensures quick availability and reduced lead times for customers.
2. Customization options: In addition to standard offerings, LONGMA GROUP can provide customized solutions to meet specific project requirements, including special dimensions, surface treatments, or end preparations.
3. Technical support: LONGMA GROUP's team of experts can provide valuable guidance in selecting the most appropriate grade of A671 pipe for your application, ensuring optimal performance and cost-effectiveness.
4. Quality assurance: All ASTM A671 pipes manufactured by LONGMA GROUP undergo rigorous testing and inspection to ensure compliance with industry standards and customer specifications.
5. Global reach: With a strong presence in the international market, LONGMA GROUP can efficiently serve customers worldwide, providing reliable logistics and delivery solutions.
For those in the market for ASTM A671 pipes, LONGMA GROUP offers a compelling combination of product quality, availability, and customer service. Their extensive stock quantity of 50-100 tons ensures that they can meet the demands of various project scales and timelines.
If you are in the process of selecting an ASTM A671 pipe manufacturer for your next project, LONGMA GROUP invites you to reach out and discuss your requirements. Their team of experts is ready to assist you in finding the perfect solution for your specific needs.
To get in touch with LONGMA GROUP and explore their ASTM A671 pipe offerings, you can contact them at info@longma-group.com. Their knowledgeable staff will be happy to provide you with detailed information about their products, discuss your project requirements, and offer tailored solutions to meet your needs.
References
1. ASTM International. (2021). ASTM A671 / A671M - 21 Standard Specification for Electric-Fusion-Welded Steel Pipe for Atmospheric and Lower Temperatures. ASTM International.
2. American Petroleum Institute. (2018). API Specification 5L: Specification for Line Pipe. American Petroleum Institute.
3. Nayyar, M. L. (2000). Piping Handbook (7th ed.). McGraw-Hill Education.
