High-Performance, High-Strength Steel Sheets for Exposed Auto Body Panels

JFE Steel has developed two types of high performance high-strength steel sheets for automobile body exposed panels. The SFG (super fine grain) HITEN, 'SFGHITEN,' which is strengthened by fine grains, gives excellent press formability with low yield strength and a large r-value. It is observed that the formation of PFZs (precipitate free zones) results in a mechanism in which yielding begins at low stress at an initial deformation stage. The UNI (uniform unique universal) HITEN, 'UNI HITEN' gives excellent press formability and superior dent resistance which are obtained by increasing yield strength after paint baking.