ASTM A945/A945M-05

    Standard Specification for High-Strength Low-Alloy Structural Steel Plate with Low Carbon and Restricted Sulfur for Improved Weldability, Formability, and Toughness


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    1. Scope

    1.1 This specification covers high-strength low-alloy structural steel plate intended for use in welded construction of naval ships where a savings in weight is important. Steels that conform to this specification offer improved weldability, formability, and toughness resulting from the specified alloying elements with limitations on carbon, sulfur, and residual element contents. Two grades, 50 and 65, may be provided as-rolled, control-rolled, thermo-mechanical control processed (including accelerated cooling), normalized, or quenched and tempered as required to meet the specified mechanical requirements.

    1.2 The maximum thickness or weight [mass] of plates shall be as follows:

    Grade Plate thickness, max, in. [mm] Plate weight [mass], max, lb/ft2 [kg/m2]
    50 2 [50] 81.7 [393]
    65 11/4 [32]51.0 [251]

    1.3 When the steel is to be welded, it is presupposed that a welding procedure suitable for the grade of steel and intended use or service will be utilized.

    1.4 The values stated in either inch-pound units or SI units are to be regarded as standard. Within the text the SI units are shown in brackets. The values stated in each system are not exact equivalents, therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with this 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

    A6/A6M Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling

    A370 Test Methods and Definitions for Mechanical Testing of Steel Products

    A673/A673M Specification for Sampling Procedure for Impact Testing of Structural Steel

    A700 Practices for Packaging, Marking, and Loading Methods for Steel Products for Shipment

    E208 Test Method for Conducting Drop-Weight Test to Determine Nil-Ductility Transition Temperature of Ferritic Steels


    ICS Code

    ICS Number Code 47.020.05 (Materials and components for shipbuilding)

    UNSPSC Code

    UNSPSC Code 30102204(Steel plate)


    Referencing This Standard

    DOI: 10.1520/A0945_A0945M-05

    ASTM International is a member of CrossRef.


    Citation Format

    ASTM A945 / A945M-05, Standard Specification for High-Strength Low-Alloy Structural Steel Plate with Low Carbon and Restricted Sulfur for Improved Weldability, Formability, and Toughness, ASTM International, West Conshohocken, PA, 2005, www.astm.org

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