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Friction can be reduced by thin film coatings or additives, but also by metallurgy under slip-rolling. Uncoated molybdenum or silicon alloyed steels have significant lower coefficients of friction under mixed-boundary conditions and slip-rolling. They are slip-rolling resistant and offer the same load carrying capacity as reference alloys, like 100Cr6 (SAE 52100 ) or 20MnCr5.
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This page is a summary of: Slip-Rolling Resistance of Alternative Steels Under High Contact Pressures in Engine Oils, September 2014, ASTM International,
DOI: 10.1520/stp158020140018.
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