HOT-ROLLED STEEL SHEET

专利名称：HOT-ROLLED STEEL SHEET

发明人：SHUTO, Hiroshi,YOKOI, Tatsuo,MAEDA,

Daisuke,SAKURADA, Eisaku,TOYODA,Takeshi

申请号：EP15821845.3申请日：20150713公开号：EP3153598A4公开日：20171129

摘要：[Object] To provide a hot-rolled steel sheet having excellent fatigue

characteristics and workability in the rolling direction. [Solution] A hot-rolled steel sheetaccording to the present invention has a chemical composition consisting of, in mass%, C:0.03 to 0.2%, Mn: 0.1 to 3.0%, P: 0.10% or less, S: 0.03% or less, Al + Si: 0.2 to 3.0%, N: morethan 0% and equal to or less than 0.01%, O: more than 0% and equal to or less than0.01%, and the balance: iron and impurities. A microstructure of the hot-rolled steelsheet contains ferrite as the main constituent, and contains hard phases constituted bymartensite and/or austenite in an amount of, in area fraction, equal to or more than 3%and less than 20%, hard phases with an aspect ratio of 3 or more account for 60% ormore of the hard phases present in a sheet-thickness central portion, a length in a rollingdirection of the hard phases present in the sheet-thickness central portion is less than 20µm, an average aspect ratio of ferrite grains is less than 5, and the sum of X-ray randomintensity ratios of <011> orientation and <111> orientation as viewed from the rollingdirection is 3.5 or more, and an X-ray random intensity ratio of <001> orientation asviewed from the rolling direction is 1.0 or less.

申请人：Nippon Steel & Sumitomo Metal Corporation

地址：6-1, Marunouchi 2-chome Chiyoda-ku Tokyo 100-8071 JP

国籍：JP

代理机构：Vossius & Partner Patentanwälte Rechtsanwälte mbB

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