CN102145349B - Method for stably controlling finishing rolling temperature of oriented silicon steel - Google Patents
Method for stably controlling finishing rolling temperature of oriented silicon steel Download PDFInfo
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- CN102145349B CN102145349B CN 201019000012 CN201019000012A CN102145349B CN 102145349 B CN102145349 B CN 102145349B CN 201019000012 CN201019000012 CN 201019000012 CN 201019000012 A CN201019000012 A CN 201019000012A CN 102145349 B CN102145349 B CN 102145349B
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- finish rolling
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Abstract
The invention provides a method for stably controlling the finishing rolling temperature of an oriented silicon steel, comprising the following steps: increasing the thickness of an intermediate slab and increasing the thickness of the oriented silicon steel by 5-10% relative to the thicknesses of other intermediate slabs of finished steels with same specification; carrying out one-row scale removal on the head and tail of the intermediate slab before finish rolling, and watering by using cooling water between finish rolling racks by adopting a sequentially opened way; and carrying out finish rolling at raising speed and tailing-out speed to reduce the fluctuation of the finishing rolling temperature, ensure the stability for the control of the finishing rolling temperature of the oriented silicon steel and enable the fluctuation range of the finishing rolling temperature of the oriented silicon steel to be stably controlled within 20 DEG C, thereby greatly improving the magnetic property of the oriented silicon steel. The method provided by the invention is simple, easy to master and convenient to operate, can rapidly take effects without investments, and has important popularizing and using values.
Description
Technical field
The invention belongs to the steel rolling process technical field, relate in particular to a kind of control method that can guarantee that the orientation silicon steel finishing temperature is stable.
Background technology
At present, the hot rolling line of domestic production orientation silicon steel adopts the arrangement form of roughing mill-finishing mill mostly, and slab becomes intermediate blank through anterior two roughing mill roughing, and then many finishing mill tandem rollings become the required roll coil of strip through the rear portion with intermediate blank.Because roll line and rolling time in whole course of hot rolling are long; Make the band steel after the roughing bigger at the temperature drop that gets into finish rolling front, tail; Give in the finish rolling process temperature control of being with steel is brought very big difficulty, thereby cause the orientation silicon steel finishing temperature unstable, not only fluctuation is bigger; And band steel toe tail temperature phenomenon on the low side appears, directly have influence on the magnetic property of finished product orientation silicon steel.
In order to eliminate oriented silicon steel band steel toe tail temperature problem of lower, the method that generally adopts at present is before finish rolling, to strengthen the cutting head cutting tail amount of intermediate blank, and finish rolling is reduced one get rid of squama water.But, see from the actual production effect, although increased intermediate blank cutting head cutting tail amount, can not low-temperature space end to end be cut away fully, still keep a part more or less.And the method that reduces by an eliminating squama water equally also can't guarantee the uniformity with the steel bulk temperature, and head and tail temperature is still on the low side.The orientation silicon steel finishing temperature is unstable, the head and tail temperature problem of lower fails effectively to be solved always thereby make.
Summary of the invention
The object of the invention aims to provide a kind of simple, is convenient to operation, need not investment and just can stablize control orientation silicon steel finishing temperature, improves the method for orientation silicon steel magnetic property.
For this reason, the solution that the present invention taked is:
A kind of method of stable control orientation silicon steel finishing temperature, its concrete steps and method are:
1, increase orientation silicon steel intermediate blank thickness relatively: for the heavy slab of thickness at 200～300mm, orientation silicon steel intermediate blank thickness increases by 5%～10% than the intermediate blank thickness of other identical trimmed size steel grades; For the medium thin slab of thickness at 100～200mm, orientation silicon steel intermediate blank thickness increases by 5%～8% than the intermediate blank thickness of other identical trimmed size steel grades;
2, intermediate blank head, tail adopt single de-scaling before the finish rolling, and the length of head, the single de-scaling of tail is 3～10m, and cooling water is taked the mode of watering opened successively to the adjacent downstream frame by upper reaches frame between each frame of finish rolling;
3, in the finish rolling process, take the method for increasing speed rolling, acceleration is set in 0.18～0.23m/s
2Between, the highest mill speed is 16～17m/s;
4, take big throwing steel speed, throw steel speed and be set between 11.5～12.5m/s.
Beneficial effect of the present invention is:
Embodiment of the present invention can effectively reduce the finishing temperature fluctuation, and the stability of assurance orientation silicon steel finishing temperature control is stablized orientation silicon steel finishing temperature fluctuation range and is controlled in 20 ℃, thereby has greatly improved the magnetic property of orientation silicon steel.The inventive method is simple, is easy to grasp, and is convenient to operation, need not investment and just can take effect rapidly, has important popularizing value.
The specific embodiment
Below, in conjunction with embodiment the present invention is further specified.
Embodiment 1:
The strand dimensions is 230 * 1150mm, the trade mark 140, and the rolled band steel specification is 2.3 * 1060mm.
Equipment and process configurations are: strand heats through heating furnace, and two roughing mill R1, R2 are rolled into intermediate blank, becomes the band steel through 7 finishing mill F1～F7 tandem rolling again, is rolled into the roll coil of strip through coiling machine.
Other steel grades of identical trimmed size, intermediate blank thickness setting are 38mm.In order to reduce the temperature drop that gets into before the finishing mill, the intermediate blank thickness setting of orientation silicon steel of the present invention is 41mm.
Strengthen intermediate blank excision amount end to end, will respectively excise 400mm end to end.Low-temperature space adopts single de-scaling to the influence of finishing temperature before intermediate blank head, the tail finish rolling in order to reduce end to end, and the length of head, the single de-scaling of tail is 5m; Simultaneously, for guaranteeing stable temperature control, according to finishing mill outlet temperature feedback, cooling water drops into cooling water between F1 and F2, F2 and F3, F3 and F4, F4 and F5 frame successively between finishing stand.
Because therefore band steel afterbody temperature drop takes the method for increasing speed rolling to improve mill speed in the finish rolling process greater than head, degree of will speed up is set in 0.22m/s
2, the highest mill speed is controlled at and is 16.8m/s.
Consider that orientation silicon steel steel under the condition of high temperature is softer, be difficult for taking place the whipping accident, therefore take big throwing steel speed, will throw steel speed and be set in 12.2m/s.
Embodiment 2:
The strand dimensions is 180 * 1150mm, the trade mark 140, and the rolled band steel specification is 2.0 * 1060mm.
Strand heats through heating furnace, and two roughing mill R1, R2 are rolled into intermediate blank, becomes the band steel through 7 finishing mill F1～F7 tandem rolling again, is rolled into the roll coil of strip through coiling machine.
Other steel grades of identical trimmed size, intermediate blank thickness setting are 35mm.In order to reduce the temperature drop that gets into before the finishing mill, the intermediate blank thickness setting of orientation silicon steel of the present invention is 37mm.
Strengthen intermediate blank excision amount end to end, will respectively excise 450mm end to end.Adopt single de-scaling before intermediate blank head, the tail finish rolling, the length of head, the single de-scaling of tail is 7m; According to finishing mill outlet temperature feedback, cooling water drops into cooling water between F1 and F2, F2 and F3, F3 and F4 frame successively between finishing stand.
Take the method for increasing speed rolling to improve mill speed in the finish rolling process, degree of will speed up is set in 0.19m/s
2, the highest mill speed is controlled at and is 16m/s, throws steel speed and is set in 11.8m/s.
Claims (1)
1. stablize the method for controlling the orientation silicon steel finishing temperature for one kind, it is characterized in that:
1) increase orientation silicon steel intermediate blank thickness, relatively: for the heavy slab of thickness at 200～300mm, orientation silicon steel intermediate blank thickness increases by 5%～10% than the intermediate blank thickness of other identical trimmed size steel grades; For the medium thin slab of thickness at 100～200mm, orientation silicon steel intermediate blank thickness increases by 5%～8% than the intermediate blank thickness of other identical trimmed size steel grades;
2), intermediate blank head, tail adopt single de-scaling before the finish rolling, the length of head, the single de-scaling of tail is 3～10m, and cooling water is taked the mode of watering opened successively to the adjacent downstream frame by upper reaches frame between each frame of finish rolling;
3), in the finish rolling process, take the method for increasing speed rolling, acceleration is set in 0.18～0.23m/s
2Between, the highest mill speed is 16～17m/s;
4), take big throwing steel speed, throw steel speed and be set between 11.5～12.5m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201019000012 CN102145349B (en) | 2010-02-08 | 2010-02-08 | Method for stably controlling finishing rolling temperature of oriented silicon steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201019000012 CN102145349B (en) | 2010-02-08 | 2010-02-08 | Method for stably controlling finishing rolling temperature of oriented silicon steel |
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| CN102145349A CN102145349A (en) | 2011-08-10 |
| CN102145349B true CN102145349B (en) | 2012-12-19 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103341489B (en) * | 2013-06-06 | 2015-06-24 | 首钢总公司 | Method for overcoming defect of forming pits in hot rolling process of high-strength IF steel containing P |
| CN104226698B (en) * | 2013-06-20 | 2016-04-27 | 宝山钢铁股份有限公司 | A kind of strip finishing temperature feed forward control method |
| CN107088585A (en) * | 2017-06-09 | 2017-08-25 | 首钢京唐钢铁联合有限责任公司 | A kind of milling method of strip |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101164720A (en) * | 2006-10-19 | 2008-04-23 | 鞍钢股份有限公司 | Continuous casting method for increasing equal thickness continuous casting plate billet equal axial crystal rate in non-oriented silicon steel |
| CN101210297A (en) * | 2006-12-27 | 2008-07-02 | 鞍钢股份有限公司 | Method for preparing tropism silicon steel |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101164720A (en) * | 2006-10-19 | 2008-04-23 | 鞍钢股份有限公司 | Continuous casting method for increasing equal thickness continuous casting plate billet equal axial crystal rate in non-oriented silicon steel |
| CN101210297A (en) * | 2006-12-27 | 2008-07-02 | 鞍钢股份有限公司 | Method for preparing tropism silicon steel |
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