Hot-dip Galvanized Steel Sheets
440MPa grade paint-bake-hardenable galvannealed steel sheets for outer panels (UNI HITEN™)
Features
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Soft ferrite matrix with small volume fraction of hard martensite lead to high performances as follows;
Low yield strength(YS) equals to 340BH ? Excellent surface-accuracy of pressed-parts (Suppressed surface distortion)
High work and bake-hardenability(WH and BH) ? Superior dent resistance (equals to 440W) - Thickness reduction of outer panels by 0.05mm is possible compared with 340BH by applying UNI HITEN.
- Excellent anti-aging property ? Possible to be used in the worm area.
Examples of product characteristics
Excellent surface-accuracy and superior dent resistance of outer panel after press-forming and baking
440MPa grade bake-hardenable steel sheets (UNI HITEN) exhibit low YS at the level of 340BH, and show excellent surface-accuracy after press-forming.
Furthermore, UNI HITHEN is possible to thickness reduction of outer panels by the improved dent resistance through increasing work and bake hardenability.
Anti-aging property
440MPa grade bake-hardenable steel sheets (UNI HITEN) exhibit excellent anti-aging property and are possible to used in the worm area.
Examples of applicable Automotive Parts
- Suitable for body outer panels demanded the following characteristics;
?Stretch formability
?Dent resistance
Contribute to thickness reduction of automotive outer panels
Steel sheets for outer panels are used in designation of parts with press-forming. If steel sheets has high yield strength (YS), the surface distortion of outer panels after press-forming is not suppressed. On the other hand, if the outer panels after press-forming has low YS, its dent-resistance is not sufficient, so that thickness reduction of outer panels is difficult. UNI HITHEN contributes to the thickness reduction of outer panels, which has been difficult previously, by achieving low YS of its steel sheet and high YS of outer panel after press-forming at the same time because of its high work-hardenability and bake-hardenability by controlling a micro structure of steel sheets.