Bake-hardenable cold rolled steel sheet and method of producing same
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United States of America Patent
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Nov 7, 2000
Grant Date -
N/A
app pub date -
Sep 29, 1998
filing date -
Sep 29, 1998
priority date (Note) -
Expired
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Abstract
A bake hardenable cold-rolled steel sheet and a method for producing the steel sheet are provided, wherein the steel sheet includes carbon in a range of about 0.003-0.1 wt. %, with the amount of carbon in solution being about 3-30 ppm, and the steel is substantially free of Ti, Nb, and V, which are otherwise commonly employed in producing low-carbon bake hardenable cold-rolled steel. The method includes a two stage batch or box anneal, a first stage of which is an intercritical batch anneal at a temperature between the A.sub.1 and A.sub.3 temperatures, and a second, subcritical batch anneal at a temperature below the A.sub.1 temperature and above 900.degree. F., with a slow controlled cooling from the intercritical temperature to the subcritical temperature, and from the subcritical temperature to ambient temperature.
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