Galvannealed steel sheet having improved spot-weldability
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United States of America Patent
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May 28, 1991
Grant Date -
N/A
app pub date -
Dec 21, 1989
filing date -
Jun 29, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A galvannealed steel sheet having a superior spot weldability characteristic in which the steel sheet has a base steel sheet cold-rolled from a material containing 0.005 wt % or less of C, 0.005 to 0.05 wt % of Ti, 0.01 to 0.1 wt % of Al, 0.005 to 0.015 wt % of Nb and 0.0002 to 0.002 wt % of B. In the process for making, the hot-dip plating layer applied after the alloying heat treatment has an Fe content of from 9 wt % to 12 wt %.
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