Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent
1997-07-16
1999-04-27
Sheehan, John
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
148320, 148533, 427433, 420126, 420127, B32B 1500
Patent
active
058979670
ABSTRACT:
A galvannealed steel sheet suited for use in automobiles, and a manufacturing method thereof. The steel sheet has tensile strength of 340 MPa or higher and paint bake hardenability of 10 MPa or higher, and excellent resistance to powdering when press formed, and excellent resistance to chipping in cold regions. The base metal of the galvannealed steel sheet consists essentially of C: 0.004-0.008%, Si: 2.5.times.P (%)-0.20%, Mn: 0.10-0.40%, P: 0.017-0.045%, sol. Al: 0.003-0.08%, Ti: 0.002-0.015%, Nb: 0.010-0.030 %, wherein Ti (%)+Nb (%): 0.012-0.035%. A steel sheet of the chemical composition described above is hot-dip galvanized, heated up to a Fe--Zn alloying temperature at a heating velocity of 20.degree. C./sec or higher, and upon completion of the Fe--Zn alloying process, cooled down from the Fe--Zn alloying temperature at a cooling velocity of 10.degree. C./sec or higher.
REFERENCES:
patent: 5356493 (1994-10-01), Tsuyama et al.
patent: 5690755 (1997-11-01), Yoshinaga et al.
Laboratory Investigations on the Morphology of the Coating and the Forming Behavior of Galvannealed Steel Sheet, by R. Brisberger et al., Galvatech '95 Conference Proceedings, Sep. 17-21, 1995, pp. 753-759.
"Coating Microstructure Assessment and Control For Advanced Product Properties of Galvannealed IF Steels," by W. van Koesveld, et al., Galvatech '95 Conference Proceedings, Sep. 17-21, 1995, pp. 343-355.
Hori Masahiko
Nakamori Toshio
Nakazawa Yoshiaki
Tanno Yasuyuki
Sheehan John
Sumitomo Metal Industries Ltd.
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