Different parameters are required for the cold rolling mill, where the selection of a robust product will pay for itself in terms of maximizing speeds and strip quality, increasing roll life and extending emulsion life. Emulsions here are more sensitive to a lack of care or mistreatment.
With housekeeping playing such an important role in the overall cost efficiency of a mill, it is critical that good cellar management is in operation. Even the best cold rolling oils will suffer if subjected to excessive contamination, ineffective filtration or contamination by other lubricants and debris. Regular inspection of the mechanical systems, to ensure that leaks are found and fixed as soon as possible, and that filtration and other mechanical equipment is in good operating condition, is essential to efficient operation.
A two month trial on a 5-stand tandem mill in the Far East using Shell Fenella CR grades, resulted in increased rolling speed, improved productivity with less reject material and good oil recovery. Another Indian steelworks has purchased a package of products and services that includes Shell Fenella rolling oils, cellar management and on-site analysis to ensure that the fluid is maintained in tip-top condition and mill output quality and quantity is maximized. When it comes to disposal, simple techniques can be applied to the separation of the fluid phases and appropriate routines employed for final disposal.
After the rolling processes, a variety of coating oils and protectives are available for many different purposes, including temporary protectives, sheet coating oils, tin-plate coatings and pickle rinse inhibitors; some simple, some complex, some solvent containing some not, dual purpose and short through to long term. In some cases the end customer will specify particular technology and local legislation may dictate certain choices.