公开(公告)号：EP2096186A1

公开(公告)日：2009-09-02

申请号：EP07849980.3

申请日：2007-11-27

申请人： Nippon Steel Engineering Corporation

发明人： HASHIMURA, Masayuki ,  MIZUNO, Atsushi ,  MIYAMOTO, Kenichiro ,  AOKI, Jun ,  ITO, Seiji

IPC分类号： C22C38/00 ,  C22C38/60

CPC分类号： C22C38/02 ,  C21D6/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/008 ,  C22C38/04 ,  C22C38/06 ,  C22C38/60

摘要： The present invention provides machining steel superior in machinability, accompanied with little melt loss of plate refractories of continuous casting sliding nozzles, and superior in ductility in hot rolling and able to prevent deterioration of the surface properties due to hot rolling, containing, by mass%, C: 0.005 to 0.2%, Si: 0.001 to 0.5%, Mn: 0.3 to 3.0%, P: 0.001 to 0.2%, S: 0.30 to 0.60%, B: 0.0003 to 0.015%, O: 0.005 to 0.012%, Ca: 0.0001 to 0.0010%, and Al≤0.01%, having an N content satisfying N≥0.0020% and 1.3×B-0.0100≤N≤1.3×B+0.003, and having a balance of Fe and unavoidable impurities, wherein, regarding the MnO in the steel, in a cross-section of the steel material perpendicular to the rolling direction, the area of MnO of a circle equivalent diameter of 0.5 µm or more being 15% or less of the area of the total Mn-based inclusions.

摘要翻译： 本发明提供了一种机械加工性优良的连续铸造滑动喷嘴板耐火材料的熔融损失少，热轧延性优良的加工钢，能够防止热轧时的表面性能的劣化，以质量％计， ，C：0.005〜0.2％，Si：0.001〜0.5％，Mn：0.3〜3.0％，P：0.001〜0.2％，S：0.30〜0.60％，B：0.0003〜0.015％，O：0.005〜0.012％ Ca：0.0001〜0.0010％，Al≤0.01％，N含量满足N‰¥0.0020％，1.3×B-0.0100‰¤N‰¤1.3×B + 0.003，余量为Fe和不可避免的杂质 其中，对于钢中的MnO，在垂直于轧制方向的钢材的截面中，当量圆直径为0.5μm以上的MnO面积为总面积的15％以下 基于Mn的夹杂物。