The centerpieces of NKK's new series of environmentally friendly steel sheets, a new chromium-free coated steel sheet "GEO-FRONTIER COAT" and a new chromium-free prepainted steel sheet "GEO-FRONTIER EXCEL COAT", have been developed. The major advantage of "GEO-FRONTIER COAT" is that it has excellent corrosion resistance comparable to conventional chromate coated steel sheets even after alkaline degreasing. This property is due to a proprietary organic composite coating. It is a new product with a good balance of corrosion resistance, electrical grounding properties, and is easy to weld. While developing "GEO-FRONTIER EXCEL COAT", a new type of primer coating was designed in order to achieve excellent corrosion resistance comparable to that provided by the conventional chromate-based prepainted steel sheet.

Galvanized steel sheet, Chromate, Cr-free coated steel sheet, Thin organic coated steel sheet, Prepainted steel sheet