A671 and A672 are EFW (Electric-Fusion Welded) Carbon Steel Pipes used for atmospheric and lower temperatures applications (A671) and high-pressure service at moderate temperatures (A672). As mentioned above, A671 is used for atmospheric and lower temperature application and A672 is used for high-pressure service applications at moderate temperature. However, if we compare the details e.g. A672 Gr.C60 & A671 Gr. CC60; the raw material plate used is same for both pipes & final mechanical properties are same. Heat treatment is same. The only difference between the 2 grades is only in the testing requirements. A672 requires weld sample drawn from a 500ft length of pipe and allows you to double the samples in case, original sample fails. A671 requires weld sample drawn from a 200ft length of pipe with no provision for a rejected weld.
ASTM A671 standard
ASTM A671 specifies standard requirements for electrofusion welded steel pipe at atmospheric and cryogenic temperatures. This standard is typically used for piping systems operating at lower pressures and temperatures where mechanical strength and corrosion resistance requirements are not as stringent as ASTM A672. ASTM A671 covers grades from CC10 to CC80, mainly using carbon steel and low alloy steel.
Key Differences Between ASTM A672 and ASTM A671
Applications: ASTM A672 is primarily used for high pressure applications at moderate and higher temperatures, while ASTM A671 is used for atmospheric and lower temperature applications.
Materials: ASTM A672 covers a wider range of materials, including carbon steel, low alloy steel, and stainless steel, while ASTM A671 primarily covers carbon steel and low alloy steel.
Strength Requirements: ASTM A672 has higher strength requirements due to its use in high pressure and high temperature applications.
