CN107552751A - The different steel grade of continuous casting round bloom is mixed to pour production method - Google Patents
The different steel grade of continuous casting round bloom is mixed to pour production method Download PDFInfo
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- CN107552751A CN107552751A CN201710769467.6A CN201710769467A CN107552751A CN 107552751 A CN107552751 A CN 107552751A CN 201710769467 A CN201710769467 A CN 201710769467A CN 107552751 A CN107552751 A CN 107552751A
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Abstract
The invention discloses a kind of mixed method poured of the different steel grade of continuous casting round bloom, comprise the following steps：Middle bag is when casting previous heat of molten steel, when the big bag of the heat there remains a certain amount of molten steel, reduction pulling rate；When remaining previous heat of molten steel is reduced to certain liquid level in middle bag, latter heat of molten steel, which is unwrapped greatly, to be poured, and the ladle covering agent wrapped in changing；After latter heat big bag casting certain time, the covering slag of crystallizer is changed；After the big bag of latter heat has cast 25t, the liquid level of middle bag is kept, and improves casting pulling rate；After the big bag of latter heat has cast 30t, middle bag liquid level is slowly promoted to normally completely liquid level casting；After the big bag of latter heat has cast 40t, the pulling rate under pulling rate is reduced into the normal degree of superheat correspondingly, normal casting.Understand from the above, the mixed method poured of the different steel grade of continuous casting round bloom of the invention, when direct casting produces different steel grade in same middle bag, it is possible to reduce hot downtime, and improve the production efficiency and continuous casting billet billet yield of conticaster.
Description
Technical field
The present invention relates to the mixed field for pouring production of the different steel grade of continuous casting round bloom, and in particular to a kind of different steel grade of continuous casting round bloom
It is mixed to pour production method.
Background technology
Many Special Steel Enterprises, its product structure species is more and is mostly some specific use steel, the order of small lot often occurs,
Certain difficulty is brought to organization of production.If only 1 to 2 stove molten steel of production, product quality are difficult to ensure that bag in one, and it
Bag is changed for up to a few houres slowly in continuous casting afterwards, has a strong impact on the rhythm of production of steel mill, and increase very big production cost.
The big different steel grades of composition difference mix in same middle bag pours production, will certainly produce the mixing of molten steel, produce
The composition that the continuous casting billet come has certain length does not meet two steel grades requirements, and here it is so-called mix to pour base.And such as
What reduces the mixed length for pouring base and its position determines it is the mixed key poured of different steel grade.How bag molten steel liquid level in control is passed through
Highly, casting time, the casting pulling rate of different phase for pouring the big bag of heat are mixed, so as to realize and solve the different steel grade of continuous casting production
Mix to pour production and shorten to mix and pour base length, be that those skilled in the art think technical problems to be solved always.
The content of the invention
It is an object of the invention to：To there is the quick direct casting between the steel grade of component difference, avoid stopping pouring in slow change
Bag production, there is provided a kind of different steel grade of continuous casting round bloom is mixed to pour production method, uses the same middle different steel grade of bag direct casting.Pass through
In reduction bag in previous heat Yu Gangliang, with reduction wrap in front and rear heat of molten steel combined amount；Reduce previous heat casting
Pulling rate, the middle bag molten steel liquid level height and casting pulling rate of the different time sections of latter heat casting are controlled, casting is reduced to reach
The molten steel feeding of base wick-containing.When realizing grade transition, the stabilization to ensureing product quality, further shortening transitional region is mixed pours
Base length, raising billet yield, reduction production cost, raising production efficiency play an important roll.
The technical solution used in the present invention is：
The different steel grade of continuous casting round bloom is mixed to pour production method, comprises the following steps：
1）In same middle bag during two kinds of different steel grades of composition of direct casting, when in the previous heat of molten steel of casting to previous heat
When there remains 15 ~ 25t or so molten steel in big bag, start to reduce pulling rate；, will be latter after the big Baogang's water of previous heat has poured
The molten steel of the big bag of heat rotates to casting position, and when the molten steel liquid level of the big bag of previous heat in central bag is relatively low, latter heat is big
The molten steel of bag is poured to middle Bao Neikai again, and the ladle covering agent of different middle bags is changed according to the difference of steel grade classification；
2）The latter big Baogang's water of heat is opened when pouring, and this carves the strand beginning label of crystallizer, is cut into according to cut lengths mixed
Pour base；
3）After the big bag of latter heat has cast 25t, casting pulling rate is improved, and remain stationary as the molten steel liquid level in middle bag；
4）After the big bag of latter heat has cast 30t, the molten steel liquid level in middle bag is slowly promoted to normally completely liquid level casting, when
The latter big bag of heat has been cast after 40t, reduces pulling rate；
5）Enter to cheat after slow cooling terminates after strand, base and previous heat strand and latter heat strand poured to the mixed of mark, it is different
Position takes horizontal low power sample, carries out the analysis of chemical composition from edge to center on low power sample, further final to confirm, judge
It is mixed to pour base length.
Further improvement project of the invention is the step 1）In, when there remains 15 ~ 25t or so in the big bag of previous heat
When molten steel, pulling rate is reduced to the minimum pulling rate of technique permission.
Further improvement project of the invention is strand of the section in the range of the mm of 380 mm of Φ ~ Φ 800, its minimum drawing
Fast scope is in the range of 0.16 m/min ~ 0.48m/min.
Further improvement project of the invention is the step 1）In, the molten steel liquid of the big bag of previous heat in central bag
When potential drop is as little as in the range of 300mm ~ 400mm, the molten steel of the latter big bag of heat pours to middle Bao Neikai again.
Further improvement project of the invention is the step 1）In, the ladle covering agent of the middle bag includes ordinary steel
Covering agent, low-silicon steel covering agent, ultra-low-carbon steel covering agent and other ladle covering agents.
Further improvement project of the invention is the step 3）In, after the big bag of latter heat has cast 25t, middle bag
Interior molten steel liquid level is maintained in the range of 500mm ~ 700mm, while pulling rate of casting is improved to technique permission highest pulling rate.
Further improvement project of the invention is that the highest pulling rate that technique allows is 0.27 m/min ~ 0.60m/min's
In the range of.
Further improvement project of the invention is the step 3）In, latter heat is unwrapped greatly pour after, middle bag cast 3 ~
When 10min, start to change the covering slag of crystallizer.
Further improvement project of the invention is, the composition of the covering slag of the crystallizer includes high-carbon steel, medium carbon steel, low
Carbon steel, manganese steel, titanium steel and other covering slags.
Further improvement project of the invention is the step 4）In, the liquid level of the middle full liquid level casting of bag is in 800mm
In the range of ~ 900mm.
Further improvement project of the invention is the step 4）In, after the big bag of latter heat has cast 40t, it will draw
Pulling rate under the as little as normal degree of superheat of prompt drop is corresponding is normally cast.
The beneficial effects of the present invention are：
Firstth, the different steel grade of continuous casting round bloom of the invention is mixed pours production method, and when different steel grade, direct casting is given birth in same middle bag
When production, it is possible to reduce hot downtime, and improve the production efficiency and continuous casting billet billet yield of conticaster, the casting machine daily output
About 40% can be improved.
Secondth, the different steel grade of continuous casting round bloom of the invention is mixed pours production method, can save production technology cost, reduction is poured
Deadhead tail base scraps length, while beneficial to the stabilization for ensureing product quality.
3rd, the different steel grade of continuous casting round bloom of the invention is mixed pours production method, is realizing different steel grade in same middle Bao Neilian
Continuous casting production simultaneously, by change the casting pulling rate in casting cycle, middle bag liquid level and it is mixed pour stove and open the opportunity of pouring, Ke Yijin
One step shortens the mixed length for pouring base, so as to improve billet yield, reduces production cost.
Brief description of the drawings：
Fig. 1 is the schematic diagram of the present invention.
Embodiment：
Patent of the present invention provide it is a kind of can make to produce casting between the very big steel grade of component difference in same middle bag, can be with
Reduce the mixed technical method for pouring base length.
Technical solution of the present invention is elaborated below by embodiment.
It is disconnected that the mm of Φ 380 and the mm of Φ 600 etc. are carried out in Jiangsu Sha Gang groups Huai Gang special steels limited company steelshop
Face steel grade is mixed to pour industrial production, and concrete scheme process is as follows：
Embodiment 1
0.03% is differed with carbon content, two steel grades of manganese content difference 0.02% are produced as in the mm sections of conticaster Φ 380
Example.
The previous big bag 1-1 of heat there remains 20t molten steel, start pulling rate being reduced to 0.48 m/min.The previous big bag of heat
After 1-1 molten steel has poured, the big bag 1-2 of latter heat is rotated into casting position；The molten steel of the big bag 1-1 of previous heat in central bag 2
When liquid level is reduced to 380mm, the latter big bag 1-2 of heat, which is opened, to be poured, and the ladle covering agent of middle bag 2 is coated by low-silicon steel and covered
Agent is replaced by ultra-low-carbon steel covering agent；The latter big bag 1-2 of heat molten steel is opened when pouring, and this strand for carving crystallizer 4 starts
It is labeled as, is cut into mix according to cut lengths and pours base 8；After the big bag 1-2 of latter heat has cast 25t, by the liquid level in middle bag 2
Keep 500mm ~ 700mm motionless, pulling rate is brought up into technique allows highest pulling rate 0.60m/min；The latter big bag 1-2 of heat, which is opened, to be poured
Afterwards, it is central bag 2 cast 6min when, the covering slag of crystallizer 4 is replaced by low-carbon steel protecting slag by manganese steel covering slag；Afterwards
The big bag 1-2 of one heat has been cast after 30t, and the molten steel liquid level in middle bag 2 is slowly promoted into normally completely liquid level casting, latter heat
Big bag 1-2 has cast after 40t, pulling rate pulling rate being reduced under the normal degree of superheat corresponds to；Enter to cheat after slow cooling terminates after strand, it is right
Mark it is mixed pour base 8 and and previous heat strand 9 and latter heat strand 7, diverse location takes horizontal low power sample, in low power
The analysis of chemical composition is carried out on sample from edge to center, it is further final to confirm, judge to mix and pour base length.
Obtained mixed base length of pouring is 4300mm, is compared with conventional prior, the mixed contraction in length for pouring base 8 about 40%.
Embodiment 2
Manganese content difference 0.4% two steel grades exemplified by the mm sections of conticaster Φ 600 are produced,
Mixed to pour production process control method and embodiment 1 is essentially the same, different is：The previous big bag 1-1 of heat there remains 15t
Molten steel, start pulling rate being reduced to 0.30 m/min；
When the remaining molten steel potential drop as little as 350mm of the big bag 1-1 of previous heat in central bag 2, the latter big bag 1-2 of heat is opened
Pour；
After the big bag 1-2 of latter heat has cast 25t, keep 500mm ~ 700mm motionless molten steel liquid level in middle bag 2, will draw
Speed, which brings up to technique, allows highest pulling rate 0.36m/min；
The latter big bag 1-2 of heat is opened pour after, it is middle bag 2 in cast 10min when, the covering slag of crystallizer 4 is protected by manganese steel
Shield slag is replaced by medium carbon steel covering slag.
Obtained mixed base length of pouring is 9000mm, is compared with conventional prior, the mixed contraction in length for pouring base 8 about 25%.
Claims (10)
1. the different steel grade of continuous casting round bloom is mixed to pour production method, it is characterised in that comprises the following steps：
1）In same middle bag（2）During interior two kinds of different steel grades of composition of direct casting, when in the previous heat of molten steel of casting to previous
The big bag of heat（1-1）When inside there remains 15 ~ 25t or so molten steel, start to reduce pulling rate；When the big bag of previous heat（1-1）Steel
After water has poured, by the big bag of latter heat（1-2）Molten steel rotate to casting position, central bag（2）The interior big bag of previous heat（1-1）
Molten steel liquid level it is relatively low when, the latter big bag of heat（1-2）Molten steel again to middle bag（2）Inside open and pour, and according to steel grade classification not
The different middle bag with replacing（2）Ladle covering agent；
2）The latter big bag of heat（1-2）Molten steel is opened when pouring, and this carves crystallizer（4）Strand beginning label, according to cut lengths
It is cut into mix and pours base（8）；
3）When the big bag of latter heat（1-2）Cast after 25t, improved casting pulling rate, and make middle bag（2）Interior molten steel liquid level is kept
It is motionless；
4）When the big bag of latter heat（1-2）Cast after 30t, Jiang Zhongbao（2）Interior molten steel liquid level is slowly promoted to normally completely liquid
Position casting, when the big bag of latter heat（1-2）Cast after 40t, reduced pulling rate；
5）Enter to cheat after slow cooling terminates after strand, base is poured to the mixed of mark（8）And previous heat strand（9）With latter heat strand
（7）, diverse location takes horizontal low power sample, carries out the analysis of chemical composition from edge to center on low power sample, further final
Confirm, judge to mix and pour base length.
2. the different steel grade of continuous casting round bloom as claimed in claim 1 is mixed to pour production method, it is characterised in that：The step 1）In,
When the big bag of previous heat（1-1）When inside there remains 15 ~ 25t or so molten steel, pulling rate is reduced to the minimum pulling rate of technique permission.
3. the different steel grade of continuous casting round bloom as claimed in claim 2 is mixed to pour production method, it is characterised in that：Section is in Φ 380
Strand in the range of the mm of mm ~ Φ 800, its minimum pulling rate scope is in the range of 0.16 m/min ~ 0.48m/min.
4. the different steel grade of continuous casting round bloom as claimed in claim 1 is mixed to pour production method, it is characterised in that：The step 1）In,
Central bag（2）The interior big bag of previous heat（1-1）Molten steel liquid level when be reduced in the range of 300mm ~ 400mm, latter stove
Secondary big bag（1-2）Molten steel again to middle bag（2）Inside open and pour.
5. the different steel grade of continuous casting round bloom as claimed in claim 1 is mixed to pour production method, it is characterised in that：The step 3）In,
When the big bag of latter heat（1-2）Cast after 25t, middle bag（2）Interior molten steel liquid level is maintained in the range of 500mm ~ 700mm,
Pulling rate of casting simultaneously, which is improved to technique, allows highest pulling rate.
6. the different steel grade of continuous casting round bloom as claimed in claim 5 is mixed to pour production method, it is characterised in that：Technique allows most
High pulling rate is in the range of 0.27 m/min ~ 0.60m/min.
7. the different steel grade of continuous casting round bloom as claimed in claim 1 is mixed to pour production method, it is characterised in that：The step 3）In,
The latter big bag of heat（1-2）Open after pouring, middle bag（2）Cast 3 ~ 10min when, start change crystallizer（4）Covering slag.
8. the different steel grade of continuous casting round bloom as claimed in claim 7 is mixed to pour production method, it is characterised in that：The crystallizer（4）
The composition of covering slag include high-carbon steel, medium carbon steel, mild steel, manganese steel and titanium steel.
9. the different steel grade of continuous casting round bloom as claimed in claim 1 is mixed to pour production method, it is characterised in that：The step 4）In,
The middle bag（2）The liquid level of full liquid level casting is in the range of 800mm ~ 900mm.
10. the different steel grade of continuous casting round bloom as claimed in claim 1 is mixed to pour production method, it is characterised in that：The step 4）In,
When the big bag of latter heat（1-2）Cast after 40t, pulling rate pulling rate being reduced under the normal degree of superheat corresponds to normally is cast.
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Cited By (9)
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| CN111331096A (en) * | 2020-03-19 | 2020-06-26 | 山西太钢不锈钢股份有限公司 | Method for eliminating bubbles of duplex stainless steel |
| CN112191817A (en) * | 2020-09-11 | 2021-01-08 | 柳州钢铁股份有限公司 | Method for safely stopping flow in casting of double-flow slab continuous casting machine |
| CN112903955A (en) * | 2021-01-21 | 2021-06-04 | 柳州钢铁股份有限公司 | Physical simulation test method and device for different steel types mixed casting in continuous casting process |
| CN113814368A (en) * | 2021-09-01 | 2021-12-21 | 包头钢铁（集团）有限责任公司 | Continuous casting production method for single-ladle special steel grade with high coping capability |
| 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 |
| 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 |
| CN114570902A (en) * | 2022-03-21 | 2022-06-03 | 柳州钢铁股份有限公司 | Method for preventing surface longitudinal cracks and corner transverse cracks from being generated in different steel types switching process of slab caster |
| CN115007828A (en) * | 2022-05-30 | 2022-09-06 | 首钢京唐钢铁联合有限责任公司 | Determination method and device for continuous casting mixed casting slab, medium and electronic equipment |
| CN116871470A (en) * | 2023-09-06 | 2023-10-13 | 成都先进金属材料产业技术研究院股份有限公司 | Continuous casting method of round billet continuous casting machine special steel type without connecting billet and connecting piece |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111331096A (en) * | 2020-03-19 | 2020-06-26 | 山西太钢不锈钢股份有限公司 | Method for eliminating bubbles of duplex stainless steel |
| CN112191817A (en) * | 2020-09-11 | 2021-01-08 | 柳州钢铁股份有限公司 | Method for safely stopping flow in casting of double-flow slab continuous casting machine |
| CN112191817B (en) * | 2020-09-11 | 2021-09-07 | 柳州钢铁股份有限公司 | Method for safely stopping flow in casting of double-flow slab continuous casting machine |
| 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 |
| CN112903955A (en) * | 2021-01-21 | 2021-06-04 | 柳州钢铁股份有限公司 | Physical simulation test method and device for different steel types mixed casting in continuous casting process |
| CN113814368A (en) * | 2021-09-01 | 2021-12-21 | 包头钢铁（集团）有限责任公司 | Continuous casting production method for single-ladle special steel grade with high coping capability |
| 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 |
| CN114570902A (en) * | 2022-03-21 | 2022-06-03 | 柳州钢铁股份有限公司 | Method for preventing surface longitudinal cracks and corner transverse cracks from being generated in different steel types switching process of slab caster |
| CN115007828A (en) * | 2022-05-30 | 2022-09-06 | 首钢京唐钢铁联合有限责任公司 | Determination method and device for continuous casting mixed casting slab, medium and electronic equipment |
| CN115007828B (en) * | 2022-05-30 | 2024-03-19 | 首钢京唐钢铁联合有限责任公司 | Method and device for determining continuous casting mixed casting slab, medium and electronic equipment |
| CN116871470A (en) * | 2023-09-06 | 2023-10-13 | 成都先进金属材料产业技术研究院股份有限公司 | Continuous casting method of round billet continuous casting machine special steel type without connecting billet and connecting piece |
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Address after: 223002 No. 188 Xi'an South Road, Qingjiangpu District, Huaian City, Jiangsu Province Applicant after: JIANGSU SHAGANG GROUP HUAIGANG SPECIAL STEEL Co.,Ltd. Address before: No. 53, Chemical Road, Jiangpu District, qingJiangpu District, Huaian, Jiangsu Applicant before: Jiangsu Shagang Group Huaigang Special Steel Co.,Ltd. |
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Effective date of registration: 20181229 Address after: 223002 No. 188 Xi'an South Road, Qingpu District, Huaian City, Jiangsu Province Applicant after: JIANGSU LIHUAI STEEL Co.,Ltd. Applicant after: JIANGSU SHAGANG GROUP HUAIGANG SPECIAL STEEL Co.,Ltd. Address before: 223002 No. 188 Xi'an South Road, Qingjiangpu District, Huaian City, Jiangsu Province Applicant before: Jiangsu Shagang Group Huaigang Special Steel Co.,Ltd. |
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Denomination of invention: Production method of mixed casting of different steel grades for continuous casting large round billets Effective date of registration: 20230927 Granted publication date: 20190607 Pledgee: Bank of Jiangsu Co.,Ltd. Huai'an Branch Pledgor: JIANGSU LIHUAI STEEL Co.,Ltd. Registration number: Y2023980059498 |