Application & Performance Analysis of ASTM A671 CC60 CC65 CC70 EFW Pipes in Pressure Vessel Industry

In modern industrial applications, the safety and reliability of pressure vessels are paramount. ASTM A671 CC60 CC65 CC70 EFW pipes, as a high-quality industrial pipe, has gained widespread application in pressure vessel manufacturing due to its superior performance and reliable quality. This article will thoroughly examine the characteristics and applications of ASTM A671 CC60 CC65 CC70 pipes.

Product Introduction of ASTM A671 CC60 CC65 CC70 EFW Pipes

ASTM A671 CC60 CC65 CC70 EFW pipes are manufactured from fine-grain killed steel plates, specifically using ASTM A516 pressure vessel quality steel plates. The series includes three grades: CC60, CC65, and CC70, corresponding to A516 Gr60, Gr65, and Gr70 plates respectively. These pipes typically feature outside diameters of 16 inches (406.4mm) or larger, with wall thicknesses of 1/4 inch (6.35mm) or greater, meeting various pressure vessel requirements.

Performance Advantages of ASTM A671 CC60 CC65 CC70 EFW Pipes

ASTM A671 CC60 CC65 CC70 EFW pipes, manufactured from premium A516 pressure vessel steel plates, offer distinct performance advantages. The material, being fine-grain killed steel, ensures excellent low-temperature toughness. The chemical composition is strictly controlled, with moderate carbon content and optimized manganese-silicon ratio, ensuring an excellent combination of strength and toughness. Additionally, stringent control of sulfur and phosphorus content guarantees superior weldability and formability.

Regarding mechanical properties, the CC60, CC65, and CC70 grades provide different strength levels to meet various pressure requirements. The product demonstrates excellent plastic deformation capability, withstanding various stresses during manufacturing and service. Notably, the material maintains good toughness at low temperatures, attributed to its fine-grain structure and well-designed alloy composition.

Welding performance is another major advantage. The double-sided welding process ensures complete penetration, avoiding common defects such as lack of fusion. The weld metal’s mechanical properties match the base material, resulting in high joint efficiency. Furthermore, various heat treatment options can optimize welded joint performance, ensuring service reliability.

Application Fields of ASTM A671 CC60 CC65 CC70 EFW Pipes

ASTM A671 CC60 CC65 CC70 EFW pipes find extensive applications in pressure vessel manufacturing. In the petrochemical industry, these products are widely used in storage tanks and processing vessels. Their excellent low-temperature performance makes them particularly suitable for liquefied natural gas (LNG) storage equipment. The large specifications and reliable quality make them ideal for large-scale storage facilities.

In the chemical industry, these pipes are utilized in manufacturing various reactors and processing vessels. Their superior corrosion resistance and reliable weld quality ensure safe operation in harsh working environments. Additionally, the high-strength characteristics allow for thinner-walled vessel design, effectively reducing equipment weight and manufacturing costs.

In the refrigeration industry, ASTM A671 CC60 CC65 CC70 pipes play a crucial role in low-temperature medium transport systems. The excellent low-temperature toughness ensures safe operation in cryogenic environments. Moreover, these products are widely used in pressure vessel manufacturing for food and pharmaceutical industries, owing to their stable performance and reliable quality.

Quality Control System

To ensure product quality, ASTM A671 CC60 CC65 CC70 EFW pipes implement a comprehensive quality control system. A complete inspection process is established from raw material receipt to finished product delivery. For raw materials, each batch of steel plates undergoes chemical composition analysis and mechanical property testing to ensure compliance with standard requirements. During manufacturing, key processes have control points to ensure product consistency.

Non-destructive testing is a crucial quality control element. Class X1 and X2 grades require 100% radiographic examination of welds to ensure weld quality. Additional ultrasonic, magnetic particle, or penetrant testing can be performed per customer requirements for comprehensive quality assessment. Hardness testing and bend tests further verify product reliability.

Dimensional control is another important aspect of quality control. Advanced processing equipment and precise control methods ensure outside diameter deviation within ±0.5% and out-of-roundness less than 1%. Stricter dimensional tolerance control can be provided for special requirements. Each batch undergoes rigorous inspection to ensure compliance with standards and customer requirements.

Heat Treatment Options

According to ASTM A671 standard, CC60 CC65 CC70 pipes offer various heat treatment options:
– Class 10,11,12,13: No heat treatment
– Class 20,21,22,23: Stress relieving
– Class 30,31,31,33: Normalizing
– Class 40,41,41,43: Normalizing and tempering
– Class 50,51,52,53: Quenching and tempering

Users can select appropriate heat treatment grades based on service environment and requirements. Heat treatment process control is crucial, with precise temperature control and holding time ensuring treatment effectiveness. All heat treatment processes are fully documented for traceability.

Usage Considerations

1. Proper Specification Selection
– Select appropriate wall thickness based on design pressure
– Choose suitable grade considering service temperature
– Select appropriate inspection class per requirements

2. Installation Recommendations
– Ensure qualified welding procedures
– Perform post-weld heat treatment when necessary
– Conduct pressure testing as required

Reference documents:

ASTM A671/A671M-16a
ASTM A516/A516M-17

ASTM A671 CC60 CC65 CC70 EFW pipes play a vital role in pressure vessel manufacturing through their superior performance and reliable quality control system. Proper selection of product specifications and heat treatment methods ensures safe and reliable pressure vessel operation. Meanwhile, strict quality control systems provide reliable product assurance. As pressure vessels continue to develop toward larger sizes and higher parameters, ASTM A671 CC60 CC65 CC70 pipes will continue to play their irreplaceable role.

These stringent quality control measures ensure the product quality of ASTM A671 CC60 CC65 CC70 pipes, providing reliable product assurance to users. The comprehensive quality control system is also a fundamental basis for market recognition of the product.

LONGMA produce and export ASTM A671 CC60 CL22 S2, ASTM A671 GR CC65 CL12 EFW steel pipes, A671 CC70 CL22 EFW pipes since 2003. As one of China leading steel pipes manufacturers since 2003, certified by API 5L, ISO9001, ISO14001, FPC, LONGMA always supply high quality A671 CC60 CC65  C70 CL22 EFW Steel pipes with full range pipe grades & pipe specifications. Contact by info@ilongma.com to get more information.