Batch-annealed dual-phase steel
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United States of America Patent
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Mar 20, 1984
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N/A
app pub date -
Oct 19, 1981
filing date -
Oct 19, 1981
priority date (Note) -
Expired
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Abstract
Dual-phase steel, consisting essentially of a ferrite matrix containing islands of martensite, is produced by batch annealing of hot or cold rolled steel having carbon below 0.2% and manganese below 2% and at least critical contents of copper (0.4%) and nickel (0.6%), with heat to the alpha plus gamma region, followed by slow cooling. This procedure is effective and controllable, and yields a dual-phase steel product that has high tensile strength with excellent elongation properties and that develops good yield strength upon moderate deformation.
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