Method of producing austenitic iron/carbon/manganese steel sheets having a high strength and excellent toughness and being suitable for cold forming, and sheets thus produced
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United States of America Patent
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Jan 23, 2018
Grant Date -
Mar 19, 2015
app pub date -
Nov 25, 2014
filing date -
Jul 22, 2003
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Abstract
A hot-rolled austenitic iron/carbon/manganese steel sheet is provided. The strength of which is greater than 900 MPa, the product (strength (in MPa)×elongation at fracture (in %)) of which is greater than 45000 and the chemical composition of which includes, the contents being expressed by weight 0.5%≦C≦0.7%, 17%≦Mn≦24%, Si≦3%, Al≦0.050%, S≦0.030%, P≦0.080% and N≦0.1%. A remainder of the composition includes iron and inevitable impurities resulting from the smelting. A recrystallized fraction of the structure of the steel is greater than 75%, a surface fraction of precipitated carbides of the steel is less than 1.5% and a mean grain size of the steel is less than 18 microns. A reinforcing element is also provided.
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