ASTM A1048/A1048M-06

    Standard Specification for Pressure Vessel Forgings, Alloy Steel, Higher Strength Chromium-Molybdenum-Tungsten for Elevated Temperature Service

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    1. Scope

    1.1 This specification covers chromium-molybdenum-tungsten alloy steel forgings intended primarily for use in boilers and pressure vessels for elevated temperature service.

    1.1.1 Elevated temperatures are temperatures in the range where creep and stress rupture properties are important for the alloy steels in this specification.

    1.2 Supplementary requirements are provided both in this specification and in the General Requirements Specification A 788/A 788M for use when additional testing or inspection is desired. These shall apply only when specified individually by the purchaser in the purchase order or contract.

    1.3 Unless the order specifies the applicable "M" specification designation, the forgings shall be supplied to the inch-pound units.

    1.4 The values stated in either inch-pound or SI (metric) units are to be regarded separately as standard. Within the text and tables, the SI units are shown in brackets. 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 nonconformance with the specification.

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

    ASTM Standards

    A275/A275M Practice for Magnetic Particle Examination of Steel Forgings

    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

    ICS Code

    ICS Number Code 77.140.30 (Steels for pressure purposes)

    UNSPSC Code

    UNSPSC Code 31132100(Steel forgings)

    DOI: 10.1520/A1048_A1048M-06

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