ASTM A691 Pipes are welded ferritic alloy steel pipes manufactured by fusion welding followed by heat treatment. These pipes are designed for high-temperature and high-pressure service, primarily in refineries, petrochemical plants, and power generation systems where superior strength, corrosion resistance, and long-term durability are essential.
The standard covers a wide range of chrome-moly steel grades (such as 1Cr-½Mo, 2¼Cr-1Mo, 9Cr-1Mo) and allows for custom configurations in terms of wall thickness, diameter, and grade combinations. Unlike seamless pipes, it uses welded construction with filler metal of matching chemical composition, offering both flexibility and cost-efficiency for large-diameter pipe applications.
Pipes under ASTM A691 are typically manufactured from plate (A387) using electric fusion welding (EFW), and are post-weld heat treated (PWHT) to ensure uniformity and mechanical integrity. They are particularly suitable for steam pipelines, heaters, and critical service piping that experiences elevated temperatures and aggressive media. click here for P11 Pipes
At Middle East Piping, we supply ASTM A691 alloy steel pipes with full EN 10204 3.1 / 3.2 certification and TPI inspection as required. Our stock and sourcing capability allows us to deliver to EPC contractors and industrial clients across Saudi Arabia, UAE, Qatar, Bahrain, and Oman with short lead times. click here for valves
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