SMS Siemag AG

Hilden, Germany

SMS Siemag AG

Hilden, Germany
SEARCH FILTERS
Time filter
Source Type

With 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 with a smelt which, in addition to iron (Fe) and unavoidable impurities, contains Si: 2.00-4.00 wt %, C: 0.025-0.100 wt %, Mn: 0.060-0.500 wt %, Cu: 0.200-0.550 wt %, Al_(sl): 0.010-0.030 wt %, S: <100 ppm, N: 80-120 ppm, and one or more elements from the group comprising Cr, V, Ni and Mo, each <0.100 wt %, b) continuously casting the smelt by thin slab continuous casting to form a strand having a thickness of 50-120 mm, and dividing the strand into thin slabs, c) heating up the thin slabs, preferably in a linear furnace, to a temperature above 1050 C. and subjecting the slabs to homogenization annealing at a maximum temperature of 1250 C., d) immediately prior to the first hot rolling pass of a subsequent hot rolling process, passing the slabs through an induction heating device, in particular, a high frequency induction heating device, and heating the thin slabs to a maximum temperature of 1350 C., which is above the respective homogenization temperature of process step c), e) continuously hot rolling the thin slabs to form a hot strip having a thickness of 1.8 mm-3.0 mm, f) cooling and reeling the hot-rolled strip at a reeling temperature of less than 650 C. to form a coil, g) pickling the hot-rolled strip after reeling and prior to a subsequent cold rolling step, h) cold rolling the hot strip in a first cold rolling stage to an (intermediate) thickness of 0.50 mm-0.80 mm, i) subjecting the resulting cold-rolled strip to recrystallization and decarburization annealing at a strip temperature ranging from 820 C.-890 C. for a period of 300-600 seconds in a gaseous annealing atmosphere which acts on the cold-rolled strip and contains nitrogen (N_(2)) and hydrogen (H_(2)), and which has a water vapor/hydrogen partial pressure ratio pH_(2)O/pH_(2 )of 0.30 to 0.60, j) in a second cold rolling stage, cold rolling the cold strip which has been subjected to recrystallization and decarburization annealing to its (final) thickness or its nominal usable thickness of 0.15 mm-0.40 mm, k) applying an annealing separator (non-stick layer) containing MgO to the strip surface of the cold-rolled strip which has been rolled to its final thickness or usable thickness, l) subjecting the cold-rolled strip which has been coated with the annealing separator to secondary recrystallization annealing by high-temperature annealing in a bell-type furnace at a temperature of >1150 C., forming a finished steel strip having a pronounced Goss texture, and m) coating the finished steel strip which has undergone secondary recrystallization annealing with an electrically insulating layer and then stress-free annealing or stress-relief annealing the coated finished steel strip, an improved process for producing grain-oriented electrical steel strip by means of thin slab continuous casting is provided, by which it is possible to introduce an inhibitor into the steel strip, which controls secondary grain growth during secondary recrystallization annealing in a high-temperature bell-type annealing furnace.


With 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 with a smelt which, in addition to iron (Fe) and unavoidable impurities, contains Si: 2.00-4.00 wt %, C: 0.025-0.100 wt %, Mn: 0.060-0.500 wt %, Cu: 0.200-0.550 wt %, Al_(sl): 0.010-0.030 wt %, S: <100 ppm, N: 80-120 ppm, and one or more elements from the group comprising Cr, V, Ni and Mo, each <0.100 wt %, b) continuously casting the smelt by thin slab continuous casting to form a strand having a thickness of 50-120 mm, and dividing the strand into thin slabs, c) heating up the thin slabs, preferably in a linear furnace, to a temperature above 1,050 C. and subjecting the slabs to homogenization annealing at a maximum temperature of 1,250 C., d) immediately prior to the first hot rolling pass of a subsequent hot rolling process, passing the slabs through an induction heating device, in particular, a high frequency induction heating device, and heating the thin slabs to a maximum temperature of 1,350 C., which is above the respective homogenization temperature of process step c), e) continuously hot rolling the thin slabs to form a hot strip having a thickness of 1.8 mm-3.0 mm, f) cooling and reeling the hot-rolled strip at a reeling temperature of less than 650 C. to form a coil, g) annealing the hot-rolled strip after reeling and prior to a subsequent cold rolling step at a temperature of between 910 C. and 1,140 C., h) cold rolling the hot strip in a first cold rolling stage to an (intermediate) thickness of 0.50 mm-0.80 mm, i) subjecting the resulting cold-rolled strip to recrystallization and decarburization annealing at a strip temperature ranging from 820 C.-890 C. for a period of 300-600 seconds in a gaseous annealing atmosphere which acts on the cold-rolled strip and contains nitrogen (N_(2)) and hydrogen (H_(2)), and which has a water vapor/hydrogen partial pressure ratio pH_(2)O/pH_(2 )of 0.30 to 0.60, j) in a second cold rolling stage, cold rolling the cold strip which has been subjected to recrystallization and decarburization annealing to its (final) thickness or its nominal usable thickness of 0.15 mm-0.40 mm, k) applying an annealing separator (non-stick layer) containing MgO to the strip surface of the cold-rolled strip which has been rolled to its final thickness or usable thickness, l) subjecting the cold-rolled strip which has been coated with the annealing separator to secondary recrystallization annealing by high-temperature annealing in a bell-type furnace at a temperature of >1,150 C., forming a finished steel strip having a pronounced Goss texture, and m) coating the finished steel strip which has undergone secondary recrystallization annealing with an electrically insulating layer and then stress-free annealing or stress-relief annealing the coated finished steel strip, an improved process for producing grain-oriented electrical steel strip by means of thin slab continuous casting is provided, by which it is possible to introduce an inhibitor into the steel strip, which controls secondary grain growth during secondary recrystallization annealing in a high-temperature bell-type annealing furnace.


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 (N_(2)) and hydrogen (H_(2)) and acts on the cold-rolled strip, and which has a water vapor/hydrogen partial pressure ratio pH_(2)O/pH_(2 )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 m and 25 m.


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 (N_(2)) and hydrogen (H_(2)) and acts on the cold-rolled strip, and which has a water vapor/hydrogen partial pressure ratio pH_(2)O/pH_(2 )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 m and 25 m.


A toothing, in particular of a drive spindle for driving a roll in rolling mills or continuous casting plants, which has several teeth and meshes with a second toothing in the manner of a spline, wherein a flank line of the teeth has a curvature, and a deflection angle is formed between the rotational axis of the second toothing and the rotational axis of the drive spindle toothing, and wherein the teeth of drive spindle toothing have a twist in form of profile angle deviation over the tooth width in the flank direction.


Briquette for producing a foamed slag on stainless steel melts in an electric arc furnace, made up of mixtures of individual or multiple substances of following basic components:


An ultrasonic nozzle for use in metallurgical installations, in particular for the top blowing of oxygen in a Basic Oxygen Furnace (BOF) or an electric arc furnace (EAF), has a convergent portion and a divergent portion, which are adjacent to each other at a nozzle throat, wherein the ultrasonic nozzle is defined by the following group of nozzle forms in a respective design case:


The invention is directed to a device for straightening a stream of a cooling medium for cooling a roll or a metal strip. This device comprise a hollow body, extending over at least part of the width of the roll or the metal strip, and a tube, arranged in the hollow body and extending in the direction of the width of the roll or the metal strip, wherein the hollow body is divided in the direction of the width of the roll or the metal strip into a number of chambers, and the tube comprises openings for introducing cooling medium into the chambers of the hollow body, and the chambers respectively comprise an opening for the flowing out of cooling medium from the hollow body. Furthermore, according to the invention the chambers, respectively, comprise a channel, formed between the inner wall of the hollow body and the tube, for conducting cooling medium from the openings of the tube to the opening for the outflow of cooling medium from the hollow body, wherein the flow cross-section of the channel narrows art least at its downstream end.


Patent
Sms Siemag Ag | Date: 2013-02-04

The invention relates to a sealing device for installation in a roll arrangement between the roll journals of a roll and chock. The sealing device has an annular main body having sealing rims that extend radially outwards. Furthermore, the sealing device has an annular reinforcement element having a strip-like section which coaxially surrounds the main body on the outer side thereof. In order to ensure the dimensional stability and thus also the function of the sealing device even after the installation thereof in the roll arrangement, that is to say after said sealing device has been pushed onto the frustroconical roll journals, the reinforcement element according to the invention has, in addition to the coaxial strip-like section, at least one flange which is connected thereto and is connected to the sealing rim. Furthermore, the invention relates to said roll arrangement.


Patent
Sms Siemag Ag | Date: 2014-03-10

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).

Loading SMS Siemag AG collaborators
Loading SMS Siemag AG collaborators