STP987: Quantitative Inclusion Ratings and Continuous Casting: User Experience and Relationships with Rolling Contact Fatigue Life

    Hampshire, JM
    Materials research manager and senior development metallurgist, RHP Bearings, Ltd., Newark, Notts, NG

    King, E
    Materials research manager and senior development metallurgist, RHP Bearings, Ltd., Newark, Notts, NG

    Pages: 20    Published: Jan 1988


    Abstract

    The limitations of the Jernkontoret (JK) method of assessing inclusions as described in ASTM E 45 are pointed out and two alternative quantitative methods of inclusion assessment presented in detail. Close relationships are demonstrated between the rolling contact fatigue life and the quantitative inclusion assessments for 25 different casts of Society of Automotive Engineers SAE 52100 type steel. From this, the SAM B-type count shows the closest relationship with fatigue life. Inclusion of the SAM count in steel specifications has improved the monitoring of steel quality from suppliers. The quality of continuous-cast bearing steel from four European suppliers is described and rules are drawn up defining the optimum method of steel manufacture and mechanical working.

    Keywords:

    bearings, fatigue life, SAE 52100 steel, SAE 4720 steel, inclusions, SAM counts, continuous casting, bearing steels


    Paper ID: STP26227S

    Committee/Subcommittee: A01.28

    DOI: 10.1520/STP26227S


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