公开(公告)号：US08960264B2

公开(公告)日：2015-02-24

申请号：US13826593

申请日：2013-03-14

Applicant: Nucor Corporation

Inventor： Rama Ballav Mahapatra ,  David W. McGaughey ,  Jay Jon Ondrovic ,  Tim Patterson ,  Mike Schueren

IPC: B22D11/06 ,  B22C9/06

CPC classification number: B22D11/0665 ,  B22C9/06 ,  B22D11/06 ,  B22D11/0622 ,  B22D11/0651

Abstract: Apparatus and method for continuously casting metal strip includes a pair of casting rolls having casting surfaces with a center portion, edge portions each having average surface roughness between 3 and 7 Ra, and intermediate portion between each edge portion and the center portion, the center portion average surface roughness between 1.2 and 4.0 times the edge portion surface roughness, and the intermediate portions average surface roughness between that of the edge and center portions. The surface roughness of the center portion is tapered across its width, and may be tapered across its width is in stepped zones. The center portion may have surface roughness varied across the surface to correspond to a desired variation in metal shell thickness across the cast strip. The center portion may be at least 60% of the casting roll width, and each edge portion may be up to 7% of the casting roll width.

Abstract translation: 用于连续铸造金属带的设备和方法包括一对铸造辊，其具有中心部分的铸造表面，平均表面粗糙度在3和7Ra之间的边缘部分以及每个边缘部分和中心部分之间的中间部分， 平均表面粗糙度在边缘部分表面粗糙度的1.2和4.0倍之间，中间部分在边缘和中心部分之间的平均表面粗糙度。 中心部分的表面粗糙度在其宽度上是锥形的，并且其宽度上的锥形可以是阶梯状的。 中心部分可以具有在表面上变化的表面粗糙度，以对应于跨过铸造带材的金属壳厚度的期望变化。 中心部分可以是铸辊宽度的至少60％，并且每个边缘部分可以高达铸辊宽度的7％。

公开(公告)号：US09744589B2

公开(公告)日：2017-08-29

申请号：US14591507

申请日：2015-01-07

Applicant: NUCOR CORPORATION

Inventor： Rama Ballav Mahapatra ,  David W. McGaughey ,  Jay Jon Ondrovic ,  Tim Patterson ,  Mike Schueren

IPC: B22D11/06 ,  B22C9/06

CPC classification number: B22D11/0665 ,  B22C9/06 ,  B22D11/06 ,  B22D11/0622 ,  B22D11/0651

Abstract: Apparatus and method for continuously casting metal strip includes a pair of casting rolls having casting surfaces with a center portion, edge portions each having average surface roughness between 3 and 7 micrometers Ra, and intermediate portion between each edge portion and the center portion, the center portion average surface roughness between 1.2 and 4.0 times the edge portion surface roughness, and the intermediate portions average surface roughness between that of the edge and center portions. The surface roughness of the center portion is tapered across its width, and may be tapered across its width is in stepped zones. The center portion may have surface roughness varied across the surface to correspond to a desired variation in metal shell thickness across the cast strip. The center portion may be at least 60% of the casting roll width, and each edge portion may be up to 7% of the casting roll width.

公开(公告)号：US11655519B2

公开(公告)日：2023-05-23

申请号：US16488437

申请日：2018-02-27

Applicant: NUCOR CORPORATION

Inventor： James W. Watson ,  Paul Kelly ,  Mike Schueren ,  Walter N. Blejde

IPC: C21D9/52 ,  C22C38/48 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  B22D11/00 ,  B22D11/06 ,  B22D11/12 ,  C21D6/00 ,  C21D1/18 ,  C22C38/46

CPC classification number: C21D9/52 ,  B22D11/001 ,  B22D11/0622 ,  B22D11/1213 ,  C21D1/18 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C21D2211/008

Abstract: This application discloses thin metal strips and methods of making thin metal strip. Particular embodiments of such methods include cooling the thin metal strip to a temperature equal to or less than a bainite or a martensite start transformation temperature BS or MS to thereby form bainite and/or martensite, respectively, within the thin metal strip, reheating the thin metal strip to a reheat temperature equal to or greater than transformation temperature Ac3 and holding the thin metal strip at the reheat temperature for at least 2 seconds and thereby forming austenite within the thin metal strip with at least 75% of austenite grains having a grain size equal to or less than 15 μm, and rapidly recooling the thin metal strip to a temperature equal to or less than the martensite start transformation temperature MS and thereby providing finer martensite within the thin metal strip from a finer prior austenite.