ASTM A991/A991M-98(2004)

    Standard Test Method for Conducting Temperature Uniformity Surveys of Furnaces Used to Heat Treat Steel Products


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    1. Scope

    1.1 This test method covers the procedures used to conduct a temperature uniformity survey on a furnace used to heat treat steel products. This method is used to determine the capability of the furnace to meet the permissible temperature variation specified in the applicable product specification, or as agreed to by the purchaser and supplier of heat treat services. Survey documentation requirements, and the procedure used to subsequently establish the furnace working zone, are defined in this test method.

    1.2 This test method covers heat treat furnaces in any of the following categories:

    1.2.1 Continuous or semi-continuous conveyance furnaces,

    1.2.2 Batch furnaces, and

    1.2.3 Salt or liquid baths and fluidized beds.

    1.3 This test method only applies when specified in the product specification or the purchase order.

    1.4 Controlling a heat treatment of steel products using thermocouples attached to the extremities of each load is an alternative to performing a furnace survey.

    1.5 By mutual agreement between the purchaser and the supplier of heat treat services, more stringent and/or additional requirements may be specified. The acceptance of any such additional requirements shall be dependent on negotiations with the supplier and must be included in the order as agreed upon by the purchaser and supplier.

    1.6 The values stated in either inch-pound units or SI units are to be regarded separately 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 is to be used independently of the other, without combining values in any way.

    1.7 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.

    SAE Standard

    AMS2750 Pyrometry

    ASTM Standards

    E207 Test Method for Thermal EMF Test of Single Thermoelement Materials by Comparison with a Reference Thermoelement of Similar EMF-Temperature Properties

    E220 Test Method for Calibration of Thermocouples By Comparison Techniques

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

    E608/E608M Specification for Mineral-Insulated, Metal-Sheathed Base Metal Thermocouples


    ICS Code

    ICS Number Code 25.200 (Heat treatment)

    UNSPSC Code

    UNSPSC Code 23281603(Heat treating age hardening furnace )


    Referencing This Standard

    DOI: 10.1520/A0991_A0991M-98R04

    ASTM International is a member of CrossRef.


    Citation Format

    ASTM A991 / A991M-98(2004), Standard Test Method for Conducting Temperature Uniformity Surveys of Furnaces Used to Heat Treat Steel Products, ASTM International, West Conshohocken, PA, 2004, www.astm.org

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