STP808

    Hot Ring Compression Tests for Evaluating Friction

    Published: Jan 1983


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    Abstract

    In the hot rolling of sheet and manufacture of seamless tubing, both process efficiency and product quality are importantly affected by frictional forces that develop between the workpiece and tooling. Process lubricants vary in their ability to reduce friction in such processes, and a need for quantiatively characterizing their hot lubrication quality exists. To this end, the hot ring compression test provides a measure of the influence of lubricants on friction at elevated temperatures.

    Ring compression specimens of 0.07% carbon steel were heated to 1015°C with and without oxide coating and compressed in air at a strain rate of 30 s−1 at a temperature of 870°C with anvils at 60°C to evaluate lubricity of four lubricants plus a no-lubricant condition. Significant differences in friction occurred only for the larger reduction of height (55%), with similar rankings for both oxidized and nonoxidized specimens. The ranking of results from least to greatest friction was graphite, lecithin, a semisynthetic oil, 20-20W motor oil, and no lubricant. Test parameters are discussed and a procedure for performing hot ring compression tests for evaluating friction is recommended.

    Keywords:

    ring compression, friction, lubrication, hot-working, lubrication, friction test, hot-friction test


    Author Information:

    Devenpeck, ML
    Associate Research Consultant and Senior Research Engineer, U.S. Steel Corporation, Research Laboratory, Monroeville, Pa.

    Rigo, JH
    Associate Research Consultant and Senior Research Engineer, U.S. Steel Corporation, Research Laboratory, Monroeville, Pa.


    Paper ID: STP36196S

    Committee/Subcommittee: E28.02

    DOI: 10.1520/STP36196S


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