Metal treatment – Process of modifying or maintaining internal physical... – Producing or treating layered – bonded – welded – or...
Patent
1996-09-11
1997-11-25
Ip, Sikyin
Metal treatment
Process of modifying or maintaining internal physical...
Producing or treating layered, bonded, welded, or...
148603, 148320, 148333, 420 87, 420 88, 428659, B32B 1518, C21D 702
Patent
active
056907559
ABSTRACT:
The present invention provides a cold-rolled steel sheet and a hot-dip galvanized steel sheet having good bake hardenability, non-aging properties at room temperature and good formability and a process for producing the same. An extra low carbon steel or an extra low carbon steel containing at least one element selected from Ti and Nb is annealed at a temperature of not lower than the AC.sub.3 transformation point to bring the structure after annealing to a structure of low-temperature transformation products. This makes it possible to provide a steel sheet that has a combination of high paint-bake hardenability and non-aging properties at room temperature and is excellent also in formability in respect of average r value (deep drawability) and elongation (punch stretchability). In particular, with respect to paint-bake hardenability, a BH property on a high level up to about 10 kgf/mm.sup.2 can be imparted according to need, and it is possible to provide a cold-rolled steel sheet and a hot-dip galvanized cold-rolled steel sheet that also have a non-aging property at room temperature.
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patent: 5384206 (1995-01-01), Ushioda et al.
Abstract of Janpan No. 4-214820 published Aug. 5, 1992.
Abstract of Japan No. 5-078783 published Mar. 30, 1993.
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Akisue Osamu
Matsumura Yoshikazu
Nishimura Kunio
Ushioda Kohsaku
Yoshinaga Naoki
Ip Sikyin
Nippon Steel Corporation
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