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A671 and A672 are both specifications for electric-fusion-welded (EFW) steel pipes used in high-temperature service applications. However, there are some differences between the two specifications.
A671 steel tube: This specification covers electric-fusion-welded steel pipe with filler metal added, used for atmospheric and lower temperatures. It is commonly used in applications such as process piping, refineries, and power plants. A671 steel tube is available in different grades and classes, with varying mechanical properties and chemical compositions.
A672 steel tube: This specification covers electric-fusion-welded steel pipe without filler metal added, used for high-pressure service at moderate temperatures. It is commonly used in applications such as petrochemical plants, gas processing plants, and power generation. A672 steel tube is also available in different grades and classes, with varying mechanical properties and chemical compositions.
Both A671 and A672 are EFW steel pipe specifications, A671 is used for atmospheric and lower temperatures, whereas A672 is used for high-pressure service at moderate temperatures. The choice between the two specifications depends on the specific requirements and operating conditions of the application.
