HIGH STRENGTH STEEL SHEET AND METHOD FOR PRODUCING THE SAME
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United States of America Patent
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Issued Date -
Jul 31, 2008
app pub date -
Oct 16, 2007
filing date -
Oct 18, 2006
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Abandoned
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Abstract
The present invention relates to A high strength steel sheet having a structure which is mainly composed of MD structure (Micro Duplex structure) comprising a ferrite matrix, and as a secondary phase, martensite or martensite and retained austenite, finely dispersed in said matrix, wherein the proportion that the MD structure occupies in the whole structure is 90% or more, wherein the proportion that the secondary phase present in the whole structure occupies in the whole structure is from 10 to 60%, wherein the secondary phase in the MD structure is present in ferrite grains and at grain boundary, in which the proportion of the secondary phase present in the ferrite grains is 50% or more, and wherein the average grain size of the secondary phase in the whole structure is 3 .mu.m or less. The secondary phase is constituted of martensite, or martensite and retained austenite.
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