ASTM A508/A508M-23a

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Anotácia textu normy ASTM A508/A508M-23a :

This specification covers quenched and tempered vacuum-treated carbon and alloy steel forgings for pressure vessels, such as those used in reactor systems, specifically, vessel closures, shells, flanges, tube sheets, rings, heads, and similar parts. Steels shall be manufactured by basic electric-furnace process except when secondary ladle refining or remelting process is employed, and shall be vacuum treated prior to or during the pouring of the ingot. Materials shall also go through preliminary heat treatment and quenching for mechanical properties. Heat and product analyses shall be executed to evaluate the conformance of the forgings with specified chemical requirements. Tension and Charpy impact tests shall also be performed to examine the conformance of steel specimens with the following mechanical properties: tensile strength, yield strength, elongation, and reduction of area. Nondestructive inspection procedures, such as magnetic particle examination, and longitudinal wave and angle beam ultrasonic examination, shall also be carried out. Repair welding may be permitted at the option of the purchaser.

Keywords:

chromium-molybdenum steel, nickel-chromium-molybdenum alloy steels, pressure vessel service, quenched and tempered steels, steel forgings—alloy, steel forgings—carbon, vacuum-treated steels ,, ICS Number Code 77.140.30 (Steels for pressure purposes)