Niobium-containing hot-rolled steel sheet with high strength and high drawability and its manufacturing processes
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United States of America Patent
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Oct 6, 1998
Grant Date -
N/A
app pub date -
May 15, 1996
filing date -
Jun 8, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The subject of the invention is a hot-rolled steel sheet with high strength and high drawability, whose composition, expressed in percentages by weight, is: C.ltoreq.0.12%; 0.5.ltoreq.Mn.ltoreq.1.5%; 0.ltoreq.Si.ltoreq.0.3%; 0.ltoreq.P.ltoreq.0.1%; 0.ltoreq.S.ltoreq.0.05%; 0.01.ltoreq.Al.ltoreq.0.1%; 0.ltoreq.Cr.ltoreq.1%; 0.01.ltoreq.Nb.ltoreq.0.1%; 0.ltoreq.Ti.sub.eff .ltoreq.0.05%, Ti.sub.eff being the content of titanium not in the form of nitrides, sulfides or oxides; and whose structure comprises at least 75% of ferrite hardened by precipitation of niobium or niobium and titanium carbides or carbonitrides, the remainder of the structure comprising at least 10% of martensite and possibly bainite and residual austenite. The subject of the invention is also processes for manufacturing such sheets.
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