FIELD: chemistry and metal working, particularly, hardening of surfaces of cast-iron tribo conjugations working under conditions of boundary friction in oil-abrasive environments. SUBSTANCE: surface of cast-iron workpiece was allowed to heat in high-speed sliding friction and then cooled by lubricating-cooling liquid containing 4.4 to 6.0 % colloid graphite and admitted into treatment zone. EFFECT: disclosed method permits building up wear- and heat-resistant layer on surfaces of cast-iron workpieces. 5 dwg
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