Current approaches to Laboratory Evaluation of Lubricant for hot and cold rolling

In cold and hot rolling of steel significant energy consumption is involved. Use of lubricants for cold rolling has been. common while use of lubricants for hot rolling is more recent. ResideB energy saving lubricants can significantly improve roll life and quality of product. One of the problems involved in developing the lubricants is prediction of lubricant performance by simpler equioment ~n the laboratory. This brief discussion note focu$es attention on the major approaches available today for lahoratory evaluation. It is considered that thoug~ the information is not exhaustive it can bring the attention of the industry the methods available. Tt is hODed that this information will stimulate discussion of the methods repDrted here

COLD ROLLING OIL PERFORMANCE-A COMPARISON BETWEEN LABORATORY ROLLING MILL AND DISK MACHINE

Five commercialoils have been evaluated in a laboratoJ:y rolling mill with multi -oasS experiments. '!he s1rips obtained have been eXCJ!\inedby SEM. '!he,sane lubricants were studiedby our technique (2) in 1111s18r disc machine and the discs eXCJ!\inedby SEM. A comparison w~ then attempted between these data which showed that the simple disc machine test offers good possibility to evaluate the cold rolling oils

Wear behaviour of nitrogen implanted stainless steel

Samples of 304 stainless steel were implanted with N2+ ions. Wear tests were carried out on a sample implanted with a dose of 5 × 1016 N2+ cm-2 at 130 keV and stored at room temperature for 10 months. Several other samples were tested within a few days after implantation. The former showed remarkable wear resistance whereas the latter failed to exhibit wear resistance. X-ray diffraction revealed the formation of γ'-Fe4 N in the aged sample whereas other samples showed little or no evidence of it. Artificial aging of one of the discs was also tried by heating it at various temperatures in the range 85-135°C but it failed to exhibit wear resistance. The oxide on each sample is found to contain Fe3O4 and/or Cr3O2. The existence of oxide is confirmed by Auger electron spectroscopy