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.
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机译：JFE Steel已开发出两种用于汽车车身外露板的高性能高强度钢板。 SFG（超细晶粒）HITEN，“ SFGHITEN〜®”，由细晶粒增强，具有出色的压制成形性，屈服强度低，r值大。观察到，PFZs（无沉淀区）的形成导致了一种机制，其中在初始变形阶段，屈服从低应力开始。 UNI（统一独特通用）HITEN，“ UNI HITEN〜®”具有出色的压制成型性和优异的抗凹痕性，这是通过提高涂料烘烤后的屈服强度而获得的。
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