ASTM A400-69(2000)

    Standard Practice for Steel Bars, Selection Guide, Composition, and Mechanical Properties

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    1. Scope

    1.1 This practice is intended as a guide for the selection of steel bars according to section and to the mechanical properties desired in the part to be produced. This is not a specification for the procurement of steel. Applicable procurement specifications are listed in Section 5.

    1.2 Several steel compositions intended for various sections and mechanical property requirements are presented in Tables 2 to 7. The criteria for placing a steel composition in one of the three general class designations, Classes P, Q, and R (described in Section 3) are as follows:

    1.2.1 Classes P and Q should be capable of developing the mechanical properties shown in Tables 2 to 5 by liquid quenching from a suitable austenitizing temperature, and tempering at 800°F (427°C) or higher. A hardness indicated by tests made at a location shown in Fig. 1, A, B, or C, is taken as evidence that a composition is capable of meeting other equivalent mechanical properties shown in the tables. Normal good shop practices are assumed, with control of austenitizing and tempering temperatures, and mild agitation of the part in the quenching bath.

    1.2.2 Class R should be capable of developing the mechanical properties shown in Tables 6 and 7 as hot rolled, by cold drawing, or by cold drawing with additional thermal treatment. The locations for obtaining tension tests are described in 6.2.

    1.3 It is not implied that the compositions listed in the tables are the only ones satisfactory for a certain class and mechanical property requirement. Steels with lower alloy contents are often satisfactory through the use of special processing techniques.


    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

    A108 Specification for Steel Bar, Carbon and Alloy, Cold-Finished

    A304 Specification for Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements

    A311/A311M Specification for Cold-Drawn, Stress-Relieved Carbon Steel Bars Subject to Mechanical Property Requirements

    A322 Specification for Steel Bars, Alloy, Standard Grades

    A633/A633M Specification for Normalized High-Strength Low-Alloy Structural Steel Plates

    A675/A675M Specification for Steel Bars, Carbon, Hot-Wrought, Special Quality, Mechanical Properties


    ICS Code

    ICS Number Code 77.140.60 (Steel bars and rods)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/A0400-69R00

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