CN107598107A - A kind of decision method of cut deal transition base length - Google Patents
A kind of decision method of cut deal transition base length Download PDFInfo
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- CN107598107A CN107598107A CN201710725898.2A CN201710725898A CN107598107A CN 107598107 A CN107598107 A CN 107598107A CN 201710725898 A CN201710725898 A CN 201710725898A CN 107598107 A CN107598107 A CN 107598107A
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- steel plate
- transition base
- tundish
- base length
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Abstract
A kind of decision method of cut deal transition base length, belongs to cut deal steelmaking technical field.It is included in the progress linear measure longimetry of transition base and constituent analysis of different casting blank section, different casting, wherein nonmetalloid silicon and sulphur has corresponding linear relationship：SSteel plate=STundishX, S refer to the content of nonmetalloid and metallic element；In the production of the continuous casting billet of different section and identical pulling rate, tracking tundish molten steel composition corresponds to finished product element relation, and the relation fitting formula with transition base is brought into by decision element composition：Y=0.3512ln (x n) 2.4951, wherein y be decision element composition difference degree, y=SSteel plate 1‑SSteel plate 2Transition base length is finally determined after the difference between two pieces of steel plate compositions is calculated.Advantage is, realizes steel billet maximization of economic benefit while reduces logistics and inspection cost.
Description
Technical field
The invention belongs to cut deal steelmaking technical field, more particularly to a kind of judgement side of cut deal transition base length
Method.More particularly in a kind of hot rolled steel plate steelmaking process transition base length decision method.
Background technology
With the continuous progress of steel and iron industry technology, continuous casting technology continues to develop, to adapt to market multi items needs, complete
Continuous casting --- on the basis of sequence casting, grade transition is developed, the production capacity of casting machine can be both improved, crop can be reduced again and cut
Tail, transition strip length is set to shorten as far as possible.The product structure of conticaster is substantially to be dominated by the kind of final products sale,
And for Heavy Plate Plant, order is intended to small lot, and specification is accurate to every block of steel plate, for user's request, meets delivery,
, it is necessary to arrange the little small lot of composition transfer even pour, in order to reduce cost it is necessary to keep away in casting cycle is normally smelted
Exempt to scrap or minimize intermediate zone slab, while casting machine production capacity is not fully exerted, ensure steel-making whole process
Direct motion, it is the requisite measure for avoiding producing quality objection, therefore, different steel that accurately division transition base, which reduces transition base length, in addition
The exploitation that kind even pours technology is just particularly urgent.The method of division transition base has demarcation strip, adjustable end stop and when the side such as slag ball at present
Method, but it is inapplicable from cost consideration in the more steel grade productions of cut deal.The decision method of the base of cut deal transition at present is mostly
Computational methods are weighed for Con casting ladle, the method causes transition base due to not accounting for molten steel mixing, hence in so that transition base
Length is inaccurate, causes the waste of very big detection, logistics and cost.Therefore it is badly in need of a kind of judgement of transition base in steelmaking process
Method, it is the technology guarantee that the judgement of transition base provides.
The content of the invention
It is an object of the invention to provide a kind of decision method of cut deal transition base length, solves mistake in steelmaking process
Cross the problem of base accurately judges.Transition base length when tundish especially suitable for 30~80t capacity produces hot rolled steel plate
It is accurate to judge.
A kind of decision method of cut deal transition base length, specific steps and parameter are as follows：
1st, for the tundish of 30~80t capacity, by being to width 1mm~4000mm, thickness 1mm~500mm, pulling rate
0~2m/min different casting blank section, the transition base linear measure longimetry of different casting and constituent analysis, due to element segregation, strengthen
The result of mechanism and Control and Inclusion Removal, cause corresponding relation be present between tundish composition in actual steel plate and steel-making, wherein non-gold
Corresponding linear relationship be present in category elemental silicon and sulphur：SSteel plate=STundish- x, S refer to the content of nonmetalloid and metallic element；
Sample position is that, for steel plate sulfur content, x is 0.0002~0.0008wt%, for steel plate at steel plate width direction 1/4
Silicon content, x are 0.005~0.02wt%；Metallic element Ni, Ti, Cr, Nb etc. equally exist corresponding linear relationship：SSteel plate
=STundish- x, S refer to the content of nonmetalloid and metallic element；Nb and Ni constituent contents x is 0.001~0.02wt%,
Ti constituent contents x is 0.002~0.01wt%, and Cr constituent contents x is 0.002~0.01wt%.
2nd, the continuous casting billet of different section and identical pulling rate production in, under the conditions of molding casting, by during grade transition into
The maximum element of phase-splitting difference is used as decision element, and nonmetalloid is silicon, sulphur etc., metallic element Ni, Ti, Cr etc., by with
Track tundish molten steel composition corresponds to finished product element relation, and the relation fitting formula with transition base is brought into by the composition of decision element：y
=0.3512ln (x-n) -2.4951, wherein y are the degree of decision element composition difference, by y=SSteel plate 1-SSteel plate 2Calculate
Draw, i.e. difference between two pieces of steel plate compositions, x is transition base length, and unit cm, n unit are m, when pulling rate is 1m/min
When, n 0m；When pulling rate is not 1m/min, n is equal to pulling rate and 8.5 times of absolute value of 1 difference；It is final true by calculating
Determine transition base length.
It is an advantage of the current invention that in steelmaking process transition base accurate judgement, in particular with 30~80t capacity
Between bag production hot rolled steel plate when transition base accurate judgement.The maximized quantity for reducing transition base, realize steel billet warp
Ji maximizing the benefits, while reduce logistics cost and inspection cost.
Embodiment
Embodiment 1
Smelt steel grade Q420qD-1 and S355-B, two steel grades require Nb content for 0.022~0.026wt% and
0.008~0.012wt%, larger difference be present, using Nb as tracking decision element.Middle inclusion quantity 50t, pulling rate 0.8m/
Min, section are width 1800mm, thickness 250mm.Smelting process is converter smelting → LF stoves refining → RH refinings → continuous casting, right
The decision method of transition base length is：
(1) metallic element Nb corresponding linear relationship is：SSteel plate=STundish- x, S refer to nonmetalloid and metallic element
Content.Tundish composition Nb elements are 0.0265wt% and 0.015wt%, Nb constituent content x are 0.005wt%, therefore
It is 0.026wt% and 0.01wt% to go out steel plate actual constituent Nb.
(2) under the premise of molding casting, by decision element Nb composition difference 0.016, bring into and intend with the relation of transition base
Close formula：Y=0.3512ln (x-n) -2.4951, it is 12.74m that can obtain transition base length x-n, while also has shadow during different casting
Ring, n is equal to pulling rate and 8.5 times of absolute value of 1 difference, i.e. 1.7m, finally determines that transition base length is by such relation
14.45 meters, transition base is 14.4m after actual constituent detection, and the goodness of fit is preferable.
Embodiment 2
Smelt steel grade D32H and Q345ZNb, in two steel grades requirements the content of sulphur be respectively 0.003~
, there is larger difference in 0.005wt% and 0.010~0.015wt%, using sulphur as tracking decision element.Middle inclusion quantity 40t,
Pulling rate is 0.75m/min, and section is width 2400mm, thickness 300mm.Smelting process is converter smelting → LF stoves refining → RH essences
Refining → continuous casting, the decision method to transition base length are：
1st, nonmetalloid sulphur is in the presence of corresponding linear relationship：SSteel plate=STundish- xS refers to nonmetalloid and metal member
The content of element.Tundish composition element sulphur is 0.0072wt% and 0.0031wt%, and sulfur content x is 0.0004wt%, because
This show that steel plate actual constituent sulphur is 0.0068wt% and 0.0027wt%.
2nd, under the premise of molding casting, by the composition difference 0.0041 of decision element sulphur, bring into and intend with the relation of transition base
Close formula：Y=0.3512ln (x-n) -2.4951, it is 12.32m that can obtain transition base length x-n, while also has one during different casting
Fixed influence, n are equal to pulling rate and 8.5 times of absolute value of 1 difference, are i.e. 2.125m, transition are finally determined by such relation
Base length is 14.445m, and transition base length is 14.25m after actual constituent detection, and the goodness of fit is preferable.
Claims (3)
1. a kind of decision method of cut deal transition base length, it is characterised in that specific steps and parameter are as follows：
1) for the tundish of 30~80t capacity, by width 1mm~4000mm, thickness 1mm~500mm, pulling rate is 0~
2m/min different casting blank section, the transition base linear measure longimetry of different casting and constituent analysis, due to element segregation, strengthening mechanism
With the result of Control and Inclusion Removal, cause corresponding relation be present between tundish composition in actual steel plate and steel-making, wherein nonmetallic member
Corresponding linear relationship be present in plain silicon and sulphur：SSteel plate=STundish- x, S refer to the content of nonmetalloid and metallic element；Sampling
Position is at steel plate width direction 1/4, and metallic element Ni, Ti, Cr and Nb equally exist corresponding linear relationship and be：SSteel plate=STundish-
X, S refer to the content of nonmetalloid and metallic element；
2) the continuous casting billet of different section and identical pulling rate production in, under the conditions of molding casting, by during grade transition into split-phase
Poor maximum element is as decision element, and nonmetalloid is silicon and sulphur, and metallic element Ni, Ti and Cr are middle by tracking
Bag molten steel component corresponds to finished product element relation, and the relation fitting formula with transition base is brought into by the composition of decision element：Y=
0.3512ln (x-n) -2.4951, wherein y are the degree of decision element composition difference, by y=SSteel plate 1-SSteel plate 2Calculate
Going out, i.e. difference between two pieces of steel plate compositions, x is transition base length, and unit cm, n unit are m, when pulling rate is 1m/min,
N is 0m；When pulling rate is not 1m/min, n is equal to pulling rate and 8.5 times of absolute value of 1 difference；Finally determined by calculating
Cross base length.
2. according to the method for claim 1, it is characterised in that be for steel plate sulfur content, x in described step 1)
0.0002~0.0008wt%, for steel plate silicon content, x is 0.005~0.02wt%.
3. according to the method for claim 1, it is characterised in that Nb and Ni constituent contents x is 0.001 in described step 1)
~0.02wt%, Ti constituent content x are 0.002~0.01wt%, and Cr constituent contents x is 0.002~0.01wt%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710725898.2A CN107598107A (en) | 2017-08-22 | 2017-08-22 | A kind of decision method of cut deal transition base length |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710725898.2A CN107598107A (en) | 2017-08-22 | 2017-08-22 | A kind of decision method of cut deal transition base length |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4269257A (en) * | 1978-07-05 | 1981-05-26 | Kawasaki Steel Corporation | Method of sequential continuous-casting of different grades of steel |
| JPS6483346A (en) * | 1987-09-24 | 1989-03-29 | Kobe Steel Ltd | Method for sequentially casting different steel kinds in continuous casting |
| CN201127992Y (en) * | 2007-11-28 | 2008-10-08 | 上海梅山钢铁股份有限公司 | Same tundish different steels continuous casting automatic insertion device |
| CN103706775A (en) * | 2013-12-13 | 2014-04-09 | 内蒙古包钢钢联股份有限公司 | Operation method for simultaneously casting secondary and special steel type long continuous castings through continuous casting machine for wide and thick plates |
| CN105268936A (en) * | 2014-07-16 | 2016-01-27 | 上海梅山钢铁股份有限公司 | Control method for mixed casting of continuous-cast tundish |
-
2017
- 2017-08-22 CN CN201710725898.2A patent/CN107598107A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4269257A (en) * | 1978-07-05 | 1981-05-26 | Kawasaki Steel Corporation | Method of sequential continuous-casting of different grades of steel |
| JPS6483346A (en) * | 1987-09-24 | 1989-03-29 | Kobe Steel Ltd | Method for sequentially casting different steel kinds in continuous casting |
| CN201127992Y (en) * | 2007-11-28 | 2008-10-08 | 上海梅山钢铁股份有限公司 | Same tundish different steels continuous casting automatic insertion device |
| CN103706775A (en) * | 2013-12-13 | 2014-04-09 | 内蒙古包钢钢联股份有限公司 | Operation method for simultaneously casting secondary and special steel type long continuous castings through continuous casting machine for wide and thick plates |
| CN105268936A (en) * | 2014-07-16 | 2016-01-27 | 上海梅山钢铁股份有限公司 | Control method for mixed casting of continuous-cast tundish |
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Application publication date: 20180119 |