Patent ID: 7669447

Claim:
Process for cold rolling strip composed of at least one of stainless steel and nonferrous metal in a multi-stand tandem rolling mill, in which first stand(s) carry out large reductions, and last stand(s) determine surface quality of the strip with low reduction, wherein an emulsion is used as a coolant and lubricant for the first stands for first passes of the strip through the tandem rolling mill with high reduction, adhering coolant and lubricant film is squeezed off the strip after it emerges from a roll gap, and only rolling oil is used as a lubricant for a last pass or passes of the strip through the tandem rolling mill with low reduction, wherein the rolling mill includes two independent coolant and lubricant systems that use emulsions and rolling oil, respectively, wherein the emulsion is squeezed off the strip after emulsion-operated rolling stands of the tandem rolling mill to maximum amounts of residual oil of 150-300 mg/in 2 , wherein the two independent systems are configured to substantially prevent any mixing of the different coolants and lubricants.