ASTM B598 - 09

    Standard Practice for Determining Offset Yield Strength in Tension for Copper Alloys

    Active Standard ASTM B598 | Developed by Subcommittee: B05.06

    Book of Standards Volume: 02.01


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    ASTM B598

    Significance and Use

    This practice may be used for approximating a limiting design stress at room temperature and, in some cases, for approximating the range of elastic behavior. Elastic limit, or the greatest stress that a material is capable of sustaining without any permanent strain remaining upon complete release of the stress, is a more technically accurate design parameter; however, the elastic limit is extremely difficult to measure in routine testing. Caution should be used in applying such values to predict the behavior of flat or wire springs in bending, torsion or other stress modes, or at temperatures other than that at which the determination is made.

    1. Scope

    1.1 This practice establishes the requirements for determining offset yield strength (0.01 %, 0.02 %, and 0.05 % offset) at room temperature. It is intended for copper alloys in tempers commonly used for spring applications, and materials thicker than 0.010 in. (0.25 mm).

    1.1.1 The primary application of this practice is intended for flat strip materials that are used for springs; however, this practice can be used for other product forms, such as wire, rod, and bar.

    1.2 UnitsThe values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

    1.3 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.

    ASTM Standards

    B950 Guide for Editorial Procedures and Form of Product Specifications for Copper and Copper Alloys

    E4 Practices for Force Verification of Testing Machines

    E6 Terminology Relating to Methods of Mechanical Testing

    E8/E8M Test Methods for Tension Testing of Metallic Materials

    E74 Practice of Calibration of Force-Measuring Instruments for Verifying the Force Indication of Testing Machines

    E83 Practice for Verification and Classification of Extensometer Systems


    ICS Code

    ICS Number Code 77.120.30 (Copper and copper alloys)

    UNSPSC Code

    UNSPSC Code 31161900(Springs)


    DOI: 10.1520/B0598-09

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