Method of press-hardening a hot-shapable plate
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United States of America Patent
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Feb 6, 2024
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N/A
app pub date -
Jun 9, 2021
filing date -
Jun 18, 2020
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Abstract
A hot-shapable uncoated steel-plate workpiece is press hardened by first transporting the plate through a heating zone continuously or discontinuously and there heating the plate to an austenitizing temperature while blocking entry of oxygen into the heating zone. Then the heated plate is cooled in a cooling zone to a martensitizing temperature below the austenitizing temperature without contacting the heated plate with oxygen. Finally, immediately and without cooling of the cooled workpiece to a martensite start temperature, the cooled workpiece is deformed at least partially in a finishing press into a desired shape.
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