Local deformability excellent in high strength hot rolled steel sheet and manufacturing method thereof
2012
The present invention relates to a local deformability superior high strength hot rolled steel sheet containing, by mass%, C: 0.07% ~ 0.20%, Si: 0.001% ~ 2.5%, Mn: 0.01% ~ 4.0%, P: 0.001% ~ 0.15%, S: 0.0005% ~ 0.03%, Al: 0.001% ~ 2.0%, N: 0.0005% ~ 0.01%, O: 0.0005% ~ 0.01%, the remainder consisting of iron and unavoidable impurities; metal structure bainite area ratio of 95% or more, the distance steel surface 5/8 to 3/8 thickness range of the thickness of the central portion of {100} <011 & gt; ~ {223} <110 & gt; pole density oriented group the average value of 4.0 or less, and {332} <113 & gt; crystal orientation of the pole density is 5.0 or less, a volume average diameter of the grains of the metal structure is 10μm or less.
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