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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.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1.1 This specification covers quenched and tempered vacuum-treated carbon and alloy steel forgings for pressure vessels such as those used in reactor systems. Specifically, it covers forgings for vessel closures, shells, flanges, tube sheets, rings, heads, and similar parts.
1.2 All grades are considered weldable under proper conditions. Welding technique is of fundamental importance, and it is presupposed that welding procedure and inspection will be in accordance with approved methods for the grade of material used.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.4 Unless the order specifies the applicable “M” specification designation, the material shall be furnished to the inch-pound units.
Note 1: Grades 1 and 1A are composed of different chemistries but have the same mechanical requirements.
Note 2: Designations have been changed as follows: Current Formerly Grade 1 Class 1 Grade 1A Class 1A Grade 2 Class 1 Class 2 Grade 2 Class 2 Class 2A Grade 3 Class 1 Class 3 Grade 3 Class 2 Class 3A Grade 4N Class 1 Class 4 Grade 4N Class 2 Class 4A Grade 4N Class 3 Class 4B Grade 5 Class 1 Class 5 Grade 5 Class 2 Class 5A Grade 22 Class 3 Class 22B Grade 22 Classes 4, 5, 6, and 7 Grade 3V Class 3V
Grade 2 Class 1
Grade 2 Class 2
Grade 3 Class 1
Grade 3 Class 2
Grade 4N Class 1
Grade 4N Class 2
Grade 4N Class 3
Grade 5 Class 1
Grade 5 Class 2
Grade 22 Class 3
Grade 22 Classes 4, 5, 6, and 7
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A275/A275M Practice for Magnetic Particle Examination of Steel Forgings
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A388/A388M Practice for Ultrasonic Examination of Steel Forgings
A788/A788M Specification for Steel Forgings, General Requirements
A966/A966M Practice for Magnetic Particle Examination of Steel Forgings Using Alternating Current
E208 Test Method for Conducting Drop-Weight Test to Determine Nil-Ductility Transition Temperature of Ferritic Steels
E428 Practice for Fabrication and Control of Metal, Other than Aluminum, Reference Blocks Used in Ultrasonic Testing
American Society of Mechanical Engineers StandardBoiler and Pressure Vessel Code—Section III, NC 2300, ND 2300, NE 2300, NF 2300, NG 2300 Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Two Park Ave., New York, NY 10016-5990, http://www.asme.org.
ICS Number Code 77.140.30 (Steels for pressure purposes)
UNSPSC Code 31132100(Steel forgings)
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ASTM A508 / A508M-16, Standard Specification for Quenched and Tempered Vacuum-Treated Carbon and Alloy Steel Forgings for Pressure Vessels, ASTM International, West Conshohocken, PA, 2016, www.astm.orgBack to Top