Organic Dry Film Lubricant Coated Steel Sheet with Excellent Press Formability

摘要

Kawasaki Steel has developed a new dry film lubricant with friction properties superior to those of conventional dry film lubricants by optimizing the glass transition temperature of a binder resin and adding polyethylene wax and inorganic lubricants. This report describes the effect of the developed dry film on the press formability of hot rolled steel sheets and galvannealed steel sheets. The results of the development suggest that the new dry film lubricant expands the application of high strength steel sheets and galvannealed steel sheets to automotive body panels. Furthermore, these steel sheets with the dry film lubricant showed the same alkaline degreasability, phosphatability and spot weldability as conventional steel sheets coated with rust preventive lubricating oil. These results also suggested that steel sheets with the dry film lubricant have excellent quality to be applied widely to automotive body panels.