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    ASTM D6549 - 06(2021)

    Standard Test Method for Determination of Cooling Characteristics of Quenchants by Cooling Curve Analysis with Agitation (Drayton Unit)

    Active Standard ASTM D6549 | Developed by Subcommittee: D02.L0.06

    Book of Standards Volume: 05.03


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    Significance and Use

    5.1 This test method provides a cooling time versus temperature curve (profile) that can be related to physical properties, such as the hardness obtainable upon quenching of a metal. The results obtained by this test method may be used as a guide in quenchant selection or as a comparison of quench severities of different quenchants, new or used.

    1. Scope

    1.1 This test method covers the equipment and the procedure for evaluation of quenching characteristics of a quenching fluid by cooling rate determination.

    1.2 This test method is designed to evaluate quenching fluids with agitation, using the Drayton Agitation Unit.

    1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.

    1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

    1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


    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

    E220 Test Method for Calibration of Thermocouples By Comparison Techniques

    E230 Specification for Temperature-Electromotive Force (emf) Tables for Standardized Thermocouples

    SAE Standards

    AMS 5665 Nickel Alloy Corrosion and Heat Resistant Bars, Forgings and Rings


    ICS Code

    ICS Number Code 75.120 (Hydraulic fluids)

    UNSPSC Code

    UNSPSC Code 15121525(Quenching oils)


    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/D6549-06R21

    Citation Format

    ASTM D6549-06(2021), Standard Test Method for Determination of Cooling Characteristics of Quenchants by Cooling Curve Analysis with Agitation (Drayton Unit), ASTM International, West Conshohocken, PA, 2021, www.astm.org

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