Low alloy third generation advanced high strength steel
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United States of America Patent
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Apr 28, 2020
Grant Date -
Nov 24, 2016
app pub date -
May 20, 2016
filing date -
May 20, 2015
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Abstract
A high strength steel comprises, during intercritical annealing, about 20-80% volume ferrite and 20-80% austenite, and wherein the Ms temperature calculated for the austenite phase during intercritical anneal ≤100° C. The high strength steel exhibits a tensile elongation of at least 20% and an ultimate tensile strength of at least 880 MPa. The high strength steel may comprise 0.20-0.30 wt % C, 3.0-5.0 wt % Mn, with Al and Si additions such that the optimum intercritical temperature is above 700° C.
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