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A New Type of High Strength
Steel for Exposed Panels
—High-Strength Steel with Excellent Formability,
Superior Surface Precision after Press Forming,
and Uniform Surface Appearance— |
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| TANAKA Yasushi URABE Toshiaki NAGATAKI Yasunobu |
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| Abstract |
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| SFGHITEN®
(super fine grain, high strength steel sheet),
which was developed recently by JFE Steel,
is strengthened by fine Nb(C, N) precipitates
and grain refinement, giving it excellent
press formability suitable for automotive
exposed panels. The Nb(C, N) precipitate shows
a unique distribution which had not been observed
previously and tends to form precipitate-depleted
zones, called precipitate free zones (PFZ),
in the vicinity of grain boundaries. These
PFZs lower yield strength in spite of the
small size of the grains. In comparison with
conventional deep-drawing sheets, SFGHITEN
has a high r-value, combined with excellent
resistance to secondary embrittlement imparted
by B addition. Try-out pressing for an automotive
front-fender model was successfully conducted
and demonstrated that the new material has
excellent formability, displaying a wider
formable range than the conventional steel.
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| Full
Pages |
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 A
New Type of High Strength Steel for Exposed
Panels —High-Strength Steel with Excellent
Formability, Superior Surface Precision after
Press Forming, and Uniform Surface Appearance—  [
PDF 8P / 718KB ] |
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