Dual-phase steels
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United States of America Patent
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Oct 4, 1983
Issued Date -
N/A
app pub date -
Mar 25, 1982
filing date -
Jan 18, 1980
priority date (Note) -
Expired
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Abstract
A process for producing a dual-phase steel in which strip is hot-rolled and cooled to exhibit a substantially bainite structure throughout its cross-section and in which it is subsequently continuously annealed in the two phase ferrite/austenite field and cooled to transform the austenite to martensite. By inter-critically annealing a bainite as opposed to a ferrite/pearlite starting structure in accordance with this invention a very much finer and more uniform distribution of martensite is obtained--this gives rise to superior combinations of ductility and tensile strength.
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