High-strength hot rolled steel plate and manufacturing method thereof
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United States of America Patent
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Issued Date -
Sep 10, 2009
app pub date -
Apr 7, 2008
filing date -
Apr 17, 2007
priority date (Note) -
Abandoned
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Abstract
The present invention provides a new high-strength and Si—Cr containing hot rolled steel plate provided with higher strength as well as excellent workability and a method for manufacturing the steel plate. The high-strength steel plate can be obtained by controlling the particle size of prior austenite to be 10 μm or less, and properly selecting the coiling temperature. The steel plate obtained includes a retained austenite phase in a volume fraction of 5% to 20%; a martensite phase in a volume fraction equal to or less than 10%; and a bainite phase in the remaining volume fraction. The particle size of the retained austenite particle is 1 μm or less and the retained austenite particles are dispersed uniformly.
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