1. Scope

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 inch-pound units or SI (metric) units are to be regarded separately as standards. Within the text and the tables, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independent of the other. Combining values from the two systems may result in nonconformance with the specification.

1.4 Unless the order specifies the applicable 'M' specification designation, the material shall be furnished to the inch-pound units.

Note 1Grades 1 and 1A are composed of different chemistries but have the same mechanical requirements.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

American Society of Mechanical Engineers Standard

ASTM Standards

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

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; Vacuum treated steel forgings--specifications; Alloy steel forgings--specifications; Carbon steel forgings--specifications; Chromium-molybdenum steel--specifications; Nickel-chromium-molybdenum alloys--specifications; Nuclear applications/materials--steel (specifications); Pressure vessel steel forgings--specifications; Quenched and tempered steels (specifications) ;

ICS Code

ICS Number Code 77.140.30 (Steels for pressure purposes)

DOI: 10.1520/A0508_A0508M-05

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