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    Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process
    1.
    发明申请
    Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process 审中-公开

    公开(公告)号：US20160111190A1

    公开(公告)日：2016-04-21

    申请号：US14638338

    申请日：2015-03-04

    Applicant: SMS Siemag AG

    Inventor： Andreas Boettcher ,  Christian Klinkenberg ,  Ingo Schuster

    IPC: H01F1/147 ,  C21D1/42 ,  C21D9/52 ,  C21D6/00 ,  C23C8/02 ,  H01F41/02 ,  C21D3/04 ,  C22C38/02 ,  C22C38/04 ,  C22C38/00 ,  C22C38/06 ,  C22C38/16 ,  C21D8/12 ,  C23C8/26

    Abstract: A process for producing grain-oriented electrical steel strip by means of thin slab continuous casting, comprising the following process steps: a) smelting a steel, b) continuously casting the smelt by thin slab continuous casting, c′) heating up the thin slabs and subjecting the slabs to homogenization annealing at a maximum temperature of 1250° C., d) heating to a temperature between 1350° C. and 1380° C., e) continuously hot rolling the thin slabs to form a hot-rolled strip, f) cooling and reeling the hot-rolled strip to form a coil, g) annealing the hot-rolled strip after reeling and prior to a subsequent cold rolling step, h) cold rolling the hot-rolled strip to the nominal usable thickness, i) subjecting the cold-rolled strip to recrystallization, decarburization and nitridation annealing, j) applying an annealing separator (non-stick layer) to the strip surface of the cold-rolled strip, k) subjecting the cold-rolled strip to secondary recrystallization annealing, forming a finished steel strip having a pronounced Goss texture, and l) stress-free annealing the finished steel strip, which has been coated with an insulating layer, provides an improved process for producing grain-oriented electrical steel strip by means of thin slab continuous casting. This is achieved in that the recrystallization, decarburization and nitridation annealing of the cold-rolled strip in process step h) comprises a decarburization annealing phase and a subsequent nitridation annealing phase, with an intermediate reduction annealing phase being interposed between the decarburization annealing phase and the nitridation annealing phase, and carried out at a temperature ranging from 820° C.-890° C., for a maximum period of 40 seconds, with a dry, gaseous annealing atmosphere, which contains nitrogen (N2) and hydrogen (H2) and acts on the cold-rolled strip, and which has a water vapor/hydrogen partial pressure ratio pH2O/pH2 of less than 0.10 and wherein a cold-rolled strip is obtained, which primary recrystallized grains have a circle equivalent mean size (diameter) between 22 μm and 25 μm.

    METHOD FOR PRODUCING A METAL STRIP BY CASTING AND ROLLING
    2.
    发明申请
    METHOD FOR PRODUCING A METAL STRIP BY CASTING AND ROLLING 有权
    通过铸造和轧制生产金属条的方法

    公开(公告)号：US20160067753A1

    公开(公告)日：2016-03-10

    申请号：US14772092

    申请日：2014-03-10

    Applicant: SMS SIEMAG AG

    Inventor： Christoph Klein ,  Christian Bilgen ,  Christian Klinkenberg ,  Michael Pander ,  Luc Neumann ,  Dieter Rosenthal ,  Cosimo Andreas Cecere

    IPC: B21B1/26 ,  C21D1/42 ,  B22D11/00 ,  C21D1/00 ,  C21D6/00

    CPC classification number: B21B1/26 ,  B21B45/004 ,  B22D11/00 ,  C21D1/00 ,  C21D1/42 ,  C21D6/00 ,  Y02P10/253

    Abstract: A method for producing a metal strip (1) by casting and rolling, wherein first a slab (3) is cast in a caster (2) by dispensing metal from a mold (4), wherein the slab (3) is deflected from the vertical direction to the horizontal direction in the region of a strand guide (5), wherein the slab (3) is then tempered in a furnace (6), wherein the slab (3) is rolled in a rolling train (7) after the furnace (6) and wherein the slab (3) is processed either in discontinuous batch operation or in continuous or semi-continuous operation in dependence on a specified manner of operation. According to the invention, in order to create optimal process conditions for all desired operating modes, the slab (3) to be rolled or the metal strip (1) being rolled is subjected to heating in the region of the rolling train (7) at least between two roll stands (8, 9, 10, 11, 12, 13, 14) by means of an inductor (15).

    Abstract translation: 一种通过铸造和轧制制造金属带（1）的方法，其中首先通过从模具（4）分配金属将板坯（3）铸造在脚轮（2）中，其中板坯（3）从 在线材引导件（5）的区域中与水平方向垂直的方向，其中，板坯（3）然后在炉子（6）中回火，其中板坯（3）在轧制线（7）之后滚动 炉子（6），并且其中所述板坯（3）以不连续的批量操作或依照指定的操作方式在连续或半连续的操作中进行处理。 根据本发明，为了为所有期望的操作模式创造最佳的工艺条件，将要轧制的板坯（3）或被轧制的金属带材（1）在轧制系（7）的区域中在 通过电感器（15）至少在两个辊架（8,9,10,11,12,13,14）之间。

    Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process
    4.
    发明申请
    Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process 审中-公开

    公开(公告)号：US20160108494A1

    公开(公告)日：2016-04-21

    申请号：US14514620

    申请日：2014-10-15

    Applicant: SMS Siemag AG

    Inventor： Andreas Boettcher ,  Christian Klinkenberg ,  Ingo Schuster

    IPC: C21D9/52 ,  C21D8/00 ,  C21D6/00 ,  C22C38/00 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C21D8/12 ,  C22C38/50

    CPC classification number: C21D9/52 ,  C21D6/008 ,  C21D8/005 ,  C21D8/1255 ,  C21D8/1272 ,  C21D8/1283 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/50

    Abstract: A process for producing grain-oriented electrical steel strip by means of thin slab continuous casting, comprising the following process steps: a) smelting a steel, b) continuously casting the smelt by thin slab continuous casting, c′) heating up the thin slabs and subjecting the slabs to homogenization annealing at a maximum temperature of 1,250° C., d) heating to a temperature between 1.350° C. and 1.380° C., e) continuously hot rolling the thin slabs to form a hot-rolled strip, f) cooling and reeling the hot-rolled strip to form a coil, g) annealing the hot-rolled strip after reeling and prior to a subsequent cold rolling step, h) cold rolling the hot-rolled strip to the nominal usable thickness, i) subjecting the cold-rolled strip to recrystallization, decarburization and nitridation annealing, j) applying an annealing separator (non-stick layer) to the strip surface of the cold-rolled strip, k) subjecting the cold-rolled strip to secondary recrystallization annealing, forming a finished steel strip having a pronounced Goss texture, and l) stress-free annealing the finished steel strip, which has been coated with an insulating layer, provides an improved process for producing grain-oriented electrical steel strip by means of thin slab continuous casting. This is achieved in that the recrystallization, decarburization and nitridation annealing of the cold-rolled strip in process step h) comprises a decarburization annealing phase and a subsequent nitridation annealing phase, with an intermediate reduction annealing phase being interposed between the decarburization annealing phase and the nitridation annealing phase, and carried out at a temperature ranging from 820° C.-890° C., for a maximum period of 40 seconds, with a dry, gaseous annealing atmosphere, which contains nitrogen (N2) and hydrogen (H2) and acts on the cold-rolled strip, and which has a water vapor/hydrogen partial pressure ratio pH2O/pH2 of less than 0.10 and wherein a cold-rolled strip is obtained, which primary recrystallized grains have a circle equivalent mean size (diameter) between 22 μm and 25 μm.

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