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Overview of ASTM A268 Steel Pipe Scope: Purpose: ASTM A268 covers seamless and welded ferritic and martensitic stainless steel tubing intended for general corrosion-resisting and high-temperature applications. Applications: These pipes are commonly used in industries where high-temperature and corrosion-resistant properties of stainless steel are required, such as in heat exchangers, boilers, superheaters, condensers, and other high-temperature applications. Materials: Stainless Steel Grades: ASTM A268 specifies grades of ferritic and martensitic stainless steels, including TP410, TP405, TP429, TP430, TP443, TP409, TP439, TP444, and others. These grades are selected based on their ability to withstand high temperatures and corrosive environments. Manufacturing Process: Seamless: ASTM A268 seamless pipes are manufactured by extruding billets through a die and then shaping into a tube by rolling or drawing. Welded: Welded pipes are produced from strip or plate, which is formed into a tubular shape and welded longitudinally or spirally. Specifications: Dimensions: Pipes are available in various sizes with specified outer diameter (OD) and wall thickness (WT). Types: ASTM A268 specifies both seamless and welded pipes. Surface Finish: Pipes may be furnished with various finishes, including annealed pickled, bright annealed, or polished finishes as specified. Mechanical Properties: Tensile Strength: Pipes must meet specified tensile requirements depending on the grade of stainless steel used. Elongation: Requirements for elongation are also specified to ensure adequate ductility of the pipes. Hardness: Ferritic and martensitic stainless steels in ASTM A268 have specific hardness requirements to ensure they meet mechanical property standards. Testing and Inspection: Mechanical Tests: Pipes undergo mechanical tests such as tensile strength test, hardness test, and flattening test. Non-Destructive Testing: ASTM A268 requires non-destructive testing methods like eddy current or ultrasonic testing to ensure the integrity of welds and overall pipe quality. Visual Inspection: Pipes are visually inspected for surface defects, dimensions, and adherence to specifications. Standards and Compliance: ASTM A268: Standard specification for seamless and welded ferritic and martensitic stainless steel tubing for general corrosion-resisting and high-temperature service. Compliance: Pipes manufactured under ASTM A268 conform to rigorous standards ensuring they meet the specified requirements for corrosion resistance, mechanical properties, and dimensional accuracy. Advantages: High Temperature Resistance: Ferritic and martensitic stainless steels specified in ASTM A268 exhibit excellent resistance to high temperatures, making them suitable for applications in heat-intensive environments. Corrosion Resistance: These steels offer good corrosion resistance in various environments, enhancing their longevity and reliability in industrial applications. Versatility: Suitable for a wide range of high-temperature applications, including heat exchangers, boilers, and other industrial equipment where high-temperature strength and corrosion resistance are critical. Conclusion: ASTM A268 steel pipes are essential components in industries requiring reliable, high-temperature-resistant tubing for various industrial applications. Their adherence to ASTM standards ensures they deliver consistent performance and durability in demanding environments where corrosion resistance and high-temperature strength are paramount.
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