公开(公告)号：EP2770073A4

公开(公告)日：2015-04-29

申请号：EP12842076

申请日：2012-10-15

申请人： JFE STEEL CORP

发明人： ICHINO KENJI ,  MOCHIDA TETSUO ,  SHIBATA HIROMITSU

IPC分类号： C22C37/00 ,  B21B27/00 ,  B21B27/03 ,  B22D13/02 ,  B32B15/01 ,  C21D1/25 ,  C21D9/38 ,  C22C37/06 ,  C22C37/10

CPC分类号： B21B27/00 ,  B21B27/032 ,  B22D13/02 ,  B32B15/011 ,  C21D1/25 ,  C21D9/38 ,  C22C37/00 ,  C22C37/06 ,  C22C37/10

摘要： There is provided a roll surface layer material made by centrifugal casting for a hot rolling mill, the roll surface layer material including a roll surface layer with excellent fatigue resistance. A roll surface layer material made by centrifugal casting has a composition including, on a mass% basis, C: 2.3% to 2.9%, Si: 0.2% to 0.8%, Mn: 0.2% to 1.0%, Cr: 5.0% to 7.5%, Mo: 4.4% to 6.5%, V: 5.3% to 7.0%, Nb: 0.6% to 1.5%, and Co: 0.1% to 4.0% so as to satisfy 14.0 ‰¤ (Mo + 1.7V) ‰¤ 17.0 (where Mo represents a content (mass%) of Mo and V represents a content (mass%) of V) and further including Al: 0.001% to 0.03% and/or REM: 0.001% to 0.03%, wherein a carbide is contained at an area fraction of 13% to 40%. Thus, the fatigue resistance of a surface layer is considerably improved. A composite roll obtained by integrally welding a shaft member to the roll surface layer member is treated as a centrifugal cast roll that includes a surface layer with excellent fatigue resistance and is suitable for hot finish rolling mill rolls.

公开(公告)号：EP2962776A4

公开(公告)日：2016-04-13

申请号：EP14756297

申请日：2014-02-25

申请人： JFE STEEL CORP

发明人： ICHINO KENJI ,  MOCHIDA TETSUO ,  SHIBATA HIROMITSU

IPC分类号： B21B27/00 ,  C22C37/00

CPC分类号： C22C37/06 ,  B21B27/00 ,  B21B27/03 ,  C22C37/00 ,  C22C37/10

公开(公告)号：EP2786813A4

公开(公告)日：2015-05-27

申请号：EP12853205

申请日：2012-11-28

申请人： JFE STEEL CORP

发明人： ICHINO KENJI ,  OZAKI SEIJI ,  MOCHIDA TETSUO

IPC分类号： B21B25/04 ,  B21B25/00 ,  C21D9/00 ,  C22C38/00 ,  C22C38/52 ,  C22C38/60

CPC分类号： C22C38/52 ,  B21B25/00 ,  B21B25/04 ,  C21D1/84 ,  C21D9/00 ,  C21D9/22 ,  C21D2211/005 ,  C22C38/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/44 ,  C22C38/48 ,  C22C38/60 ,  Y10T428/24967

公开(公告)号：EP3135392A4

公开(公告)日：2017-05-24

申请号：EP15810994

申请日：2015-06-26

申请人： JFE STEEL CORP

发明人： ITOH YOICHI ,  ICHINO KENJI ,  MOCHIDA TETSUO

IPC分类号： B21B27/00 ,  B21B27/02 ,  B22D13/02 ,  C21D5/00 ,  C22C37/00

CPC分类号： B21B27/02 ,  B21B27/024 ,  B21B2267/26 ,  B22D13/02 ,  B22D25/02 ,  C21D5/00 ,  C22C37/00 ,  C22C37/04 ,  C22C37/06 ,  C22C37/10 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/32 ,  C22C38/36

摘要： Provided is a centrifugal cast caliber roll for a hot rolling mill having excellent wear resistance, excellent fatigue resistance, and excellent slip resistance. The roll has a chemical composition containing, by mass%, C: 1.8% or more and 3.0% or less, Si: 0.2% or more and 1.0% or less, Mn: 0.2% or more and 1.5% or less, Cr: 5% or more and 9% or less, Mo: 4.0% or more and 7.0% or less, V: 4.0% or more and 7.0% or less, Nb: 0.5% or more and 2.0% or less, and the balance being Fe and inevitable impurities, in which the relationship 0.6 ‰¤ (C - 0.24V - 0.13Nb) ‰¤1.4 (where, C, V, and Nb each denote the content (mass%) of the corresponding chemical element) is satisfied, and has a surface hardness of Hs 67 or higher and Hs 76 or lower in terms of shore hardness. With this, it is possible to obtain a caliber roll with which it is possible not only to inhibit wear and fatigue but also to prevent slip even in a harsh hot rolling environment in which a high rolling load is applied. In addition, there is an effect of improving the productivity of steel materials (such as a steel pipe), significantly improving the quality of products, and improving roll life.

摘要翻译： 本发明提供一种耐磨损性优异，耐疲劳性优异，耐滑性优异的热轧机用离心铸造口径辊。 所述辊具有以质量％计含有C：1.8％以上且3.0％以下，Si：0.2％以上且1.0％以下，Mn：0.2％以上且1.5％以下，Cr： 5％以上且9％以下，Mo：4.0％以上且7.0％以下，V：4.0％以上且7.0％以下，Nb：0.5％以上且2.0％以下，余量为 Fe和不可避免的杂质，其中满足0.6≤（C-0.24V-0.13Nb）≤1.4（其中，C，V和Nb分别表示相应化学元素的含量（质量％）） 以肖氏硬度计，表面硬度Hs 67以上，Hs 76以下。 由此，能够获得即使在施加高轧制负荷的苛刻的热轧环境下也能够抑制磨损和疲劳，并且防止滑动的口径辊。 另外，具有提高钢材（钢管等）的生产率，大幅提高产品品质，提高辊寿命的效果。

公开(公告)号：EP2896709A4

公开(公告)日：2016-05-11

申请号：EP13837702

申请日：2013-09-06

申请人： JFE STEEL CORP

发明人： ICHINO KENJI ,  MOCHIDA TETSUO ,  SHIBATA HIROMITSU

IPC分类号： C22C37/08 ,  B21B27/00 ,  B21B27/03 ,  B22D11/128 ,  B32B15/01 ,  C21D9/38 ,  C22C37/10

CPC分类号： B21B27/03 ,  B21B27/032 ,  B22D11/1287 ,  B32B15/011 ,  C21D9/38 ,  C22C37/08 ,  C22C37/10 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/34 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/52 ,  C22C38/54 ,  C22C38/56

摘要： Provided are a surface layer material of a hot rolling mill roll and a hot rolling mill composite roll having high wear resistance, heat shock resistance, and surface deterioration resistance at the same time. The surface layer material has a chemical composition containing, by mass%, C: 2.4% or more and 3.5% or less, Si: 1.2% or more and 2.4% or less, Mn: 0.2% or more and 2.0% or less, Cr: 0.8% or more and 2.1% or less, Mo: 0.3% or more and 1.1% or less, Ni: 3.0% or more and 6.0% or less, V: 1.0% or more and 2.2% or less, Nb: 0.1% or more and 0.5% or less, REM: 0.0005% or more and 0.1% or less, Al: 0.003% or more and 0.05% or less, and the balance being Fe and inevitable impurities, in which the contents of C, Cr, V, Nb, REM, and Al satisfy the relationships Cr+0.2 ‰¤ C-(0.24×V+0.13×Nb) ‰¤ 3.0 and 0.01 ‰¤ REM/Al ‰¤ 3.2 (where C, Cr, V, Nb, REM, and Al respectively represent the contents (mass%) of corresponding chemical elements).