CN103706775A - Operation method for simultaneously casting secondary and special steel type long continuous castings through continuous casting machine for wide and thick plates - Google Patents
Operation method for simultaneously casting secondary and special steel type long continuous castings through continuous casting machine for wide and thick plates Download PDFInfo
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Abstract
The invention discloses an operation method for simultaneously casting secondary and special steel type long continuous castings through a continuous casting machine for wide and thick plates. The operation method comprises the steps of making a fixed mark M at a fan-shaped section outlet, calculating a casting blank length a of molten steel in a middle ladle under a condition with a limit value through section of a produced casting blank, and setting a fixed length from a crystallizer to a last fan-shaped section outlet as b; controlling and reducing the molten steel in a former furnace in the middle ladle to the limit value after new molten in a next furnace is in place in a production process; opening a large ladle and pouring one furnace of molten steel comprising new components into the middle ladle, mixing the molten steel comprising the new components with the molten steel in the former furnace to arrive at the crystallizer of the continuous casting machine, recording a total casting length c at the opening moment, making a first mark in the position of the fixed mark M and a position with the casting blank length of c+b on the casting blank; making a second mark in a part in a meter of the subsequent casting blank and manufacturing a part between the first mark and the second mark on the casting blank as mixed casting blanks of two types of steel; and distributing the mixed casting blanks of two types of steel according to differences and properties of components of the steel types.
Description
Technical field
The present invention relates to a kind of casting production technology, specifically, relate to a kind of wide thickness plate continuous casting machine and water method of operating with watering long company of time different steel grade.
Background technology
For meeting the current market demand, each Wide and Thick Slab steel plant constantly to breed structure improve, kind quantity is increasing, because Wide and Thick Slab steel plant are wide in variety, order is little in batches, need conticaster constantly to organize separately the production schedule of having cast, so each waters and time will consume resistance to material and the manpower of some, cause the cost of the product structure that added value own is high significantly to promote, under above-mentioned background, problem that whether can continuous pouring between different steel grade becomes and becomes increasingly conspicuous.Therefore, guaranteeing under the prerequisite of product quality, can realize the method for operating of continuous pouring between the different steel grades that composition or performance are close, will reduce production costs to whole Wide and Thick Slab steel plant, and enhance productivity, more effectively carry out organization of production and bring into play vital effect.
The many employings when processing this problem of each steel plant are again opened and are watered after stopping watering, or carry out the conventional methods such as tundish quick change and solve.But all there is following shortcoming and defect in method of operating:
After employing stops watering, again opening the method for watering has increased the time between watering time, has increased base quantity scrapped end to end, and this way has reduced conticaster operating rate and conticaster lumber recovery, has improved ton steel cost.
Although the time of the way of quick change tundish between can saving and watering time, but increased the usage quantity of tundish, and in the process of quick change tundish, pulling rate need to drop to very lowly, for the slab quality produced of the fast process that rises after bag in the reduction of speed before bag in quick change and quick change, cannot be guaranteed.
In sum, need at present a kind ofly can reduce production costs and sentence end to end useless base quantity, slab quality is not impacted again, must save and water the minor tick time, guarantee that the successional of casting water method of operating with watering long company of time different steel grade.
Summary of the invention
Technical problem solved by the invention is to provide a kind of wide thickness plate continuous casting machine and waters method of operating with watering long company of time different steel grade, can realize continuous pouring between the steel grade that composition or performance are close, improve the continuity of rhythm of production and production, guaranteed to produce the performance of high-level variety steel.
Technical scheme is as follows:
Wide thickness plate continuous casting machine waters a method of operating with watering long company of time different steel grade, comprising:
The mark M that fixes in fan-shaped section exit, a of molten steel strand length in limiting value situation in bag in calculating by the casting blank section of producing, the regular length of setting from crystallizer to last fan-shaped section exit is b;
After the new molten steel of next stove puts in place in process of production, the molten steel of a upper stove in middle bag is controlled and is reduced to limiting value; Pull open large bag by bag in the one heat steel water inflow of new composition, in the molten steel of new composition and middle bag, after the mixing of molten steel of a upper stove, arrive the crystallizer of conticaster, record pulls open constantly total cast length c, and in fixation mark M position, the first mark is done in the position that strand length is c+b on strand; Strand after the first mark is the mixed composition strands of two steel grades, at a rice of strand subsequently, does the second mark, and the part on strand between the first mark and the second mark is the mixed strands that water of two steel grades;
According to the difference of steel grade composition and performance, distribute the mixed whereabouts of watering strand of two steel grades.
Further: if carbon content difference is less than 0.30% in two steel grade compositions, and total alloy content difference steel grade of being less than 0.80%, the mixed strand that waters of two steel grades to be grouped into and originally to be watered in the steel grade that time performance requirement is relatively low or component content is relatively low.
Further: if in two steel grade compositions carbon content difference be greater than 0.30% or total alloy content difference be greater than 0.80%, the mixed strand that waters of two steel grades demote and is changed the original sentence to other rank steel grade, or two steel grades are mixed and water strand and process as steel scrap.
Further: the limiting value of the middle bag that rated capacity is 42 tons is 10 tons.
Further: from crystallizer, to last fan-shaped section exit, be 40 meters, at 40 meters of, fixation mark M be set, regular length b is 40 meters.
Further: in fixation mark M position, with high temperature resistant chalk, on strand, to do the first mark and the second mark.
Compared with prior art, the technology of the present invention effect comprises:
The present invention can realize continuous pouring between composition or the close steel grade of performance, improve operating rate and the lumber recovery of conticaster, reduce ton steel cost, assurance slab quality is unaffected, greatly reduce to open simultaneously and water the quantity of sentencing end to end useless base, the consumption of having saved middle Bao Naicai, has improved the continuity of rhythm of production and production, guarantee to produce the performance of high-level variety steel, create very considerable economic benefit.
Accompanying drawing explanation
Fig. 1 is that in the present invention, wide thickness plate continuous casting machine waters operation chart with watering long company of time different steel grade.
The specific embodiment
Patent of the present invention provides between a kind of composition or the close steel grade of performance can continuous pouring, both need not stop to water reorganization, in need not changing again, bag causes resistance to material waste, by Jiang Zhong Baogang water, be down to long company of different steel grade of the limit and water method of operating, be intended to the continuity that improves rhythm of production and guarantee to produce, guarantee to produce high-level variety steel performance, reduce production costs.
Below with reference to accompanying drawing and preferred embodiment, technical solution of the present invention is elaborated.
As shown in Figure 1, in the present invention, wide thickness plate continuous casting machine waters operation chart with watering long company of time different steel grade.Wide thickness plate continuous casting machine waters method of operating with watering long company of time different steel grade, comprises the following steps:
Step 1: calculate the regular length (this length is given continuous casting machine drawing) from crystallizer 1 to last fan-shaped section 2 exit, mark fixes in fan-shaped section exit; The strand length a of molten steel in limiting value situation in bag in calculating by the casting blank section of producing, the regular length of setting from crystallizer 1 to last fan-shaped section 2 exit is b;
For example: from crystallizer 1, to last fan-shaped section 2 exit regular length, be 40 meters, setting this regular length is b=40 rice, at 40 meters of, a fixation mark M is set.
Step 2: after the new molten steel of next stove puts in place in process of production, the molten steel of a upper stove in middle bag is controlled and (is for example reduced to limiting value, the middle bag that rated capacity is 42 tons, 6 tons is the limit weight of slag under middle bag, stay the time of 4 tons to do the processing such as the emergency of burning oxygen, therefore selecting 10 tons is limiting value), pull open large bag by bag in the one heat steel water inflow of new composition, the molten steel of new composition arrives the crystallizer 1 of conticaster after mixing with the molten steel (molten steel of composition before) of a upper stove in middle bag, record pulls open total cast length c constantly, the strand length that 10 tons of molten steel that during the casting blank section of producing by reference calculates, in bag, two steel grade compositions mix produce is a rice, strand 3 goes out in fixation mark M position, to do the first mark after fan-shaped section 2 and (with high temperature resistant chalk, draw the first diatom, this is strand length=c+b rice constantly), after the first diatom, starting is the mixed composition strands of two steel grades, length is a rice, therefore, does the second mark (with high temperature resistant chalk, draw the second diatom at a rice of strand 3 subsequently, this is strand length=c+b+a rice constantly), the part on strand 3 in the middle of two diatoms is the mixed strands that water of two steel grades,
Step 3: distribute the mixed whereabouts of watering strand of two steel grades according to the difference of steel grade composition and performance.
Through long-term theoretical calculating, properties of product comparison and the mixed strand two ends experiment sampling proof of watering, the strand length that 10 tons of molten steel produce can all comprise two mixed strands of different molten steel compositions completely.
As follows to the mixed strand division methods of watering of two steel grades between two diatoms according to the difference of steel grade composition by quality portion:
(1) for the close steel grade of two compositions, (require carbon content difference in two steel grade compositions to be less than 0.30%, and total alloy content difference is less than 0.80%), can water strand and be grouped in that steel grade that wherein component content is relatively low this section two steel grades are mixed, this section mixed water strand can be according to that relatively low steel grade contract execution of component content, without any loss.
(2), if two kinds of steel grades differ greatly (in two steel grade compositions, carbon content difference is greater than 0.30%, or total alloy content difference is greater than 0.80%), this section two steel grades are mixed to be watered strand and demotes and change the original sentence in the contract of other rank steel grade.
(3) if two kinds of steel grades differ greatly, (in two steel grade compositions, carbon content difference is greater than 0.30%, or total alloy content difference is greater than 0.80%), relevant contract demote and is changed the original sentence to, and these section two steel grades mix and water strand and directly can judge as steel scrap and process.
With watering time different steel grade length, be to carry out together with the contractor plan of same steel series, same rank performance being arranged in connecting and watering operation with watering vice-minister with watering the mixed Manipulative principle of steel, to increase the high-level low-level frequency that is divided into as far as possible; Reduce to water because two steel grades are mixed strand composition difference large, cannot demote and change the original sentence to, can only make to sentence the useless frequency of processing.
Be any situation in above three kinds of judgements all than open separately water more cost-saving, arrange the steel grade of close composition and performance watering together time production, two steel grades that produce are mixed to be watered strand and is downgraded to low level steel grade, benefit is opened and is watered more considerablely than independent tissue, even if this section of strand sentenced the useless steel scrap that produces, also far below independent tissue, waters the rejection number time producing.Meanwhile, thisly with watering long company of time different steel grade, water that method of operating does not stop to water, quick change tundish not, therefore can improve conticaster operating rate and lumber recovery, reduce ton steel cost.And pulling rate is constant in mixed steel operating process, compare the frequent rise in price pulling rate of driving separately the stove end to end watering, can guarantee that slab quality is unaffected, therefore can improve conticaster operating rate and lumber recovery, significantly reduce ton steel cost.
In addition, if high-level high-performance variety steel is opened separately, water ending, an one heat steel is driven the stage of watering and last stove and is stopped the low pulling rate strand that the stage of watering produces and have quality problems, requires in addition the steel grade of flaw detection can not guaranteed performance must do degradation and processes.And this method of operating is watered and the heat that finishes up carries out production transition as opening with conventional steel grade, can well guarantee high-level high-performance variety steel and require lumber recovery and the flaw detection qualification rate of flaw detection steel grade.
Below in conjunction with embodiment, the technology of the present invention effect is further described.
Embodiment 1:
A kind of wide thickness plate continuous casting machine waters maneuver with watering long company of time different steel grade, organize and water separately time production and can significantly improve productivity effect, the production time benefit of take calculates to be example: mix to water once can save and water minor tick 90 minutes, average conticaster per minute produces 3.5 tons of steel, can increase production 315 tons, by 100 yuan of calculating of benefit per ton, can create 31500 yuan of benefits.
Embodiment 2:
Wide thickness plate continuous casting machine waters a maneuver with watering long company of time different steel grade, organizes to water separately time production and can significantly improve productivity effect, take and saves resistance to material as example:
In to be bundled into be originally 11500 yuan, 500 yuan of expenses are dried in middle bag preheating, 2000 yuan of envelope dummy ingot materials, 31500 yuan of production time benefits, amount to 45500 yuan;
And by the third the poorest judgement situation, produce 10 tons of mixed bases that water and all sentence useless calculating, by finished product price 4800 and 2000 yuan of calculating of 2800 yuan of price differences of steel scrap price, 10 tons of mixed bases that water reduce by 20000 yuan of benefits;
20000 yuan=25500 yuan of the benefits of 45500 yuan of the benefits that increase-reduce, therefore, this maneuver is compared tissue and is watered separately time production and can increase by 25500 yuan of benefits..
Embodiment 3:
Wide thickness plate continuous casting machine waters a maneuver with watering long company of time different steel grade, organizes to water separately time production and can significantly improve productivity effect, take casting blank section 1950*250 as example.
One is watered inferior fixing excision strand two ends learies: a base 600mm, tail base 800mm, be total to 1400mm, and 3.8 tons of every meter of weight of this section, often water 7.86 tons of inferior loss amounts end to end so fixing.In addition, often water time to stop watering and also will produce 8 tons of specified middle bag casting residual molten steels, the loss amount that amounts to generation is 15.86 tons.
Mixed watering once produces mixed 10 tons of the base weight (most mixed water base and still can change the original sentence to for other contract, here by the third the poorest judgement situation, produces 10 tons of mixed bases that water and all sentence useless calculating) of watering.
This waters mixed steel method of operating and organize more separately to open to water and still can be avoided producing 5.86 tons of steel scrap amounts with watering long company of time different steel grade, by 4800 yuan of finished product prices and 2000 yuan of calculating of 2800 yuan of price differences of steel scrap price, brings benefits altogether 11720 yuan.
Claims (6)
1. wide thickness plate continuous casting machine waters a method of operating with watering long company of time different steel grade, comprising:
The mark M that fixes in fan-shaped section exit, a of molten steel strand length in limiting value situation in bag in calculating by the casting blank section of producing, the regular length of setting from crystallizer to last fan-shaped section exit is b;
After the new molten steel of next stove puts in place in process of production, the molten steel of a upper stove in middle bag is controlled and is reduced to limiting value; Pull open large bag by bag in the one heat steel water inflow of new composition, in the molten steel of new composition and middle bag, after the mixing of molten steel of a upper stove, arrive the crystallizer of conticaster, record pulls open constantly total cast length c, and in fixation mark M position, the first mark is done in the position that strand length is c+b on strand; Strand after the first mark is the mixed composition strands of two steel grades, at a rice of strand subsequently, does the second mark, and the part on strand between the first mark and the second mark is the mixed strands that water of two steel grades;
According to the difference of steel grade composition and performance, distribute the mixed whereabouts of watering strand of two steel grades.
2. wide thickness plate continuous casting machine waters method of operating with watering long company of time different steel grade as claimed in claim 1, it is characterized in that: if carbon content difference is less than 0.30% in two steel grade compositions, and the steel grade that total alloy content difference is less than 0.80%, is grouped into the mixed strand that waters of two steel grades originally to water in the steel grade that time performance requirement is relatively low or component content is relatively low.
3. wide thickness plate continuous casting machine waters method of operating with watering long company of time different steel grade as claimed in claim 1, it is characterized in that: if in two steel grade compositions carbon content difference be greater than 0.30% or total alloy content difference be greater than 0.80%, the mixed strand that waters of two steel grades demote and changed the original sentence to other rank steel grade, or two steel grades are mixed and water strand and process as steel scrap.
4. wide thickness plate continuous casting machine waters method of operating with watering long company of time different steel grade as claimed in claim 1, it is characterized in that: the limiting value of the middle bag that rated capacity is 42 tons is 10 tons.
5. wide thickness plate continuous casting machine waters method of operating with watering long company of time different steel grade as claimed in claim 1, it is characterized in that: from crystallizer, to last fan-shaped section exit, be 40 meters, at 40 meters of, fixation mark M be set, regular length b is 40 meters.
6. wide thickness plate continuous casting machine waters method of operating with watering long company of time different steel grade as claimed in claim 1, it is characterized in that: in fixation mark M position, with high temperature resistant chalk, do the first mark and the second mark on strand.
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| CN107999717A (en) * | 2017-12-11 | 2018-05-08 | 南京钢铁股份有限公司 | A kind of generous specification slab grade transition production technology |
| CN112159923A (en) * | 2020-09-09 | 2021-01-01 | 山东钢铁股份有限公司 | Mixed casting steel grade and production method for stable mixed casting of special-shaped blank special-shaped steel grade |
| CN114247861A (en) * | 2020-09-23 | 2022-03-29 | 上海梅山钢铁股份有限公司 | Optimized cutting method for different steel type mixed casting continuous casting slab |
| CN114247861B (en) * | 2020-09-23 | 2023-09-05 | 上海梅山钢铁股份有限公司 | Optimized cutting method for mixed casting continuous casting slab of different steel types |
| CN113084113A (en) * | 2021-03-08 | 2021-07-09 | 山东钢铁股份有限公司 | Different steel type mixed casting method suitable for slab caster |
| CN113084113B (en) * | 2021-03-08 | 2022-06-14 | 山东钢铁股份有限公司 | Different steel type mixed casting method suitable for slab caster |
| CN113953475A (en) * | 2021-10-26 | 2022-01-21 | 马鞍山钢铁股份有限公司 | Automatic identification method and device for continuous casting different steel type mixed casting blank |
| CN114515825A (en) * | 2022-01-19 | 2022-05-20 | 邯郸钢铁集团有限责任公司 | Control method for accurately cutting different-steel-grade and different-section mixed casting blank based on molten steel components |
| CN114515825B (en) * | 2022-01-19 | 2023-05-26 | 邯郸钢铁集团有限责任公司 | Control method for accurately cutting different-steel-type different-section mixed casting blank based on molten steel components |
| CN114939637A (en) * | 2022-06-14 | 2022-08-26 | 河钢乐亭钢铁有限公司 | Method for judging steel type capable of being subjected to mixed casting and judging mixed casting blank |
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