CN102021263A - Method for producing medium carbon alloy steel by melting and continuous casting in converter - Google Patents
Method for producing medium carbon alloy steel by melting and continuous casting in converter Download PDFInfo
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- CN102021263A CN102021263A CN2009101875404A CN200910187540A CN102021263A CN 102021263 A CN102021263 A CN 102021263A CN 2009101875404 A CN2009101875404 A CN 2009101875404A CN 200910187540 A CN200910187540 A CN 200910187540A CN 102021263 A CN102021263 A CN 102021263A
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Abstract
The invention provides a method for producing medium carbon alloy steel by melting and continuous casting. The method comprises the following steps: molten iron pretreatment to converter melting to a ladle furnace (LF) to vacuum degassing (VD) to wire feeding treatment to continuous casting to blank casting. The method overcomes the defects of long production period, high cost, low finished product rate, high energy consumption and the like in a conventional production process, effectively reduces the content of P and S and the content of harmful impurities in steel, purifies the steel, improves the comprehensive performance of the products comprehensively, and can meet the requirement on special users so as to fulfill the aims of saving energy, reducing cost, and improving finished product rate and yield. In the method, a long-term backward alloy production process of medium carbon steel is discarded; a more suitable and high-efficiency production method is provided for the production of the medium carbon steel; and simultaneously, the implementation of the method also promotes the development and the technical progress of metallurgical enterprises greatly.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, particularly relate to a kind of smelting, continuous casting producing method of medium carbon alloy steel.
Background technology
The hardness steel alloy is a kind of steel grade of special purpose in the middle carbon.In the traditional production method of metallurgical manufactory is to adopt converter to add external refining or electric arc furnace smelting, and its Production Flow Chart is: converter smelting-Argon-dust-ingot casting-steel ingot heating-breaking down cogging-steel billet slow cooling-steel billet cleaning-steel billet second-heating-billet rolling-high tempering-service check-warehouse-in.
According to this production method, from the angle of smelter technical progress, there are the following problems:
The one, the finished product rate of steel is low.Single from the steel ingot to the steel billet, billet yield only is 80% (crop 13.5%, back-end crop 3.5%, cast loss 3%), and comprehensive material lumber recovery only reaches about 62%.
The 2nd, the production cycle is long, and energy dissipation is bigger.Owing to go into P, the S content higher (between 0.030%-0.060%) of stove molten iron, reduce C, P, S in the steel, to adjust Si, Mn and need consume a large amount of tap to tap time, whole tap to tap time will be about 2 hours.Because electric furnace must pass through processes such as smelting period, oxidation period, reduction period, therefore single stove production time at least need be more than 5 hours again, and energy dissipation is serious.In addition, need also behind the ingot steel casting that steel ingot is transported to the rough rolling mill and carry out the demoulding, heating, split rolling method, consume a large amount of human and material resources resources.
The 3rd, purity of steel is relatively poor.Because only be furnished with Argon behind the stove, the treatment facility that dusts, so the P in the steel, S content are higher, wherein P substantially about 0.020%-0.025%, S is also about 0.015%-0.020%.
The 4th, the production cost height of steel.Because above-mentioned process was more during two kinds production method experiences, lumber recovery is relatively low, has therefore caused the cost of the two finished product steel plate higher.
Summary of the invention
In order to overcome the deficiency that above-mentioned prior art exists, further satisfy the development of user's needs and promotion metallurgical technology, the invention provides the method for a kind of converter, continuous casting production medium carbon alloy steel.This method can reduce P, S content and the detrimental impurity content in the steel greatly, purifies steel, improves the over-all properties of steel, thereby reaches save energy, reduces cost, and improves the purpose of lumber recovery and output.Simultaneously, enforcement of the present invention has also greatly promoted the technical progress of smelter, for the production of medium carbon alloy steel provides a kind of suitable more, production method efficiently.
The method that converter provided by the invention, continuous casting are produced medium carbon alloy steel is:
Hot metal pretreatment-converter smelting-LF-VD-line feeding processing-continuous casting (induction stirring)-strand advances to cheat slow cooling-strand heating-strand rolling-steel plate slow cooling-check-warehouse-in.
Major technique feature of the present invention has following five aspects:
The one, adopt hot metal pretreatment.The molten iron of going into the stokehold is reduced S, P content in the molten iron after pre-treatment effectively, can be reduced to usually about 0.015%, for shortening converter smelting cycle, raising steel quality have been established basis preferably.Owing to adopt hot metal pretreatment, can make the whole converter smelting time shorten about 50 minutes.P in the steel can drop to below 0.015% basically, S can drop to below 0.010% basically.The converter tapping temperature should be controlled at about 1630 ℃-1650 ℃ simultaneously.
The 2nd, the application of external refining-LF stove.Molten steel is handled by the LF stove, can adjust effectively not only that each elemental composition reaches the internal control target in the steel, but also can reduce S in the steel, P constituent content effectively, guarantees that P in the steel is controlled at about 0.012%, S can reach about 0.003%.Simultaneously can also improve liquid steel temperature, VD handles and the machine cast of going up provides condition in order to carry out.Generally, the LF stove treatment time is 50-70 minute, to take out of temperature be 1640 ℃-1650 ℃.
The 3rd, external refining-VD handles.Molten steel can make the gas in the steel drop to minimum level after handling by VD.H in the steel, 0, N reach 2.0ppm, 10.0ppm respectively and below the 20.0ppm, can prevent the generation of white point in steel billet and the steel plate effectively generally speaking, improve the purity of molten steel.Generally, VD requires the dwell time to be: 15-25 minute; Taking out of temperature is about 1530 ℃-1570 ℃.
The 4th, external refining-line feeding is handled.By a certain amount of Si-Ca line of feeding in steel, can make the sex change that is mingled with in the steel, and form low-melting duplex impurity and fully float, enter in the slag, make in the steel be mingled with content and rank is descended significantly, basically can reach the level of A 1.5, B1.0, C1.0, D1.5, steel has had great improvement.Generally, the content basic controlling of Xiang Gangzhong feeding Si-Ca line is at 500m-1000m.
The 5th, continuous casting.Continuous casting is a key link of the present invention.Whether the direct motion of continuous cast method will directly influence the quality of strand, and even the over-all properties of steel plate.In casting process, wanting the following several procedures of important control:
1, protection cast.Adopt tundish submerged nozzle, ladle long nozzle cast, and blow the Ar protection, can prevent the secondary oxidation and the nozzle clogging of whole casting process effectively, guarantee the cast direct motion.
2, the selection of covering slag.For fully guaranteeing the quality of strand and the direct motion of casting process, in producing, present method should select the CC-205B model covering slag that is complementary with this steel grades.
3, induction stirring.Adopt electromagnetic agitating technology can make strand in process of setting, destroy the growth of column crystal effectively, form desired equiax crystal, enlarge the ratio of equiax crystal.The mode that induction stirring adopted for alternately, continuously, two groups reverse, output frequency is 2-8Hz, electric current is 450A-650A.
4, pulling rate.The starting speed of throwing is that 0.3m/min, standard casting speed are 0.7m/min, can guarantee the success of strand cast so effectively, and the inside and outside surface quality of strand is effectively controlled.
Adopt the production method that provides of the present invention to have following advantage:
The one, significantly improve finished product rate.To adopt the 30CrMnMoRE steel of producing is example, owing to carry out sequence casting, its billet yield can reach 95%, and finished product rate can reach more than 85%.
The 2nd, shorten the production cycle, save energy.Adopt the present invention to produce medium carbon alloy steel, the whole converter smelting time is substantially in 50 minutes.The continuously cast bloom of Sheng Chaning can directly advance to cheat slow cooling simultaneously, and employing-fire is rolling after the slow cooling, has saved breaking down cogging operation, and the production cycle can be saved 4-5 days time, reduces the energy.
The 3rd, improved purity of steel.By the outer method for refining of the serial stove of the present invention's employing, can adjust effectively at short notice not only that each elemental composition reaches the internal control target in the steel, but also can reduce S in the steel, P constituent content effectively, make that P in the steel is controlled at about 0.012%, S can reach about 0.003%.Gas H, O in the steel, N can be reduced to 2.0ppm, 10.0ppm respectively and below the 20.0ppm, can eliminate the generation of white point in steel billet and the steel plate effectively, improve the purity of steel.
The 4th, the lumber recovery of raising steel reduces cost.Adopt method of the present invention to produce the 30CrMnMoRE steel, list has just improved 22.6% from the finished product rate aspect.
In sum, the production method of converter provided by the invention, continuous casting 30CrMnMoRE steel is except having advantage as above, and finished product steel plate metallurgical quality improves, and The comprehensive performance improves comprehensively, can satisfy special user's needs.Simultaneously, also greatly promoted the technical progress of smelter.
Embodiment
According to converter provided by the invention, continuous cast method production-stove 30CrMnMoRE medium carbon alloy steel, concrete implementation step is as follows:
Hot metal pretreatment-converter smelting-LF-VD-line feeding processing-continuous casting (induction stirring)-strand
1. hot metal pretreatment: will go into the stove molten iron and carry out pre-treatment, S, P content in the molten iron are effectively reduced.
2. converter smelting: adopt 90 tons of converter smeltings, add up to 103 tons of starting material to add converters 93.4 tons of raw materials, 9.6 tons of steel scraps, be blended into molten iron and carry out melting, the converter smelting time is 50 minutes, and tapping temperature is 1640 ℃.P in the molten steel, S content are respectively 0.011%, 0.007%.
3. external refining-LF stove is handled: the molten steel after the melting enters the LF stove and carries out the external refining processing, and the treatment time is 60 minutes, carries out trimming by adding lime, calcium carbide, fluorite etc. therebetween, and the treatment time is 50-70 minute, and taking out of temperature is 1645 ℃.P in the molten steel is controlled at 0.012% after treatment, S is 0.003%.
External refining-VD handles: molten steel enters VD and carries out the vacuum stripping processing, and the VD evacuated time is 4 minutes, and effectively the dwell time is 22 minutes, and taking out of temperature is 1550 ℃.H, the O, the N that handle in the steel of back reach 2.0ppm, 10.0ppm and 20.0ppm respectively.
External refining-line feeding is handled: molten steel is fed Si-Ca line 700m after VD handles, and P, S content are controlled at 0.013%, 0.005% respectively in the steel at this moment, and [H], [O] content reach 0.8ppm, 6ppm respectively.
4. continuous casting: select the CC-205B covering slag, physical and chemical index is: CaO/SiO
2Be 0.82, softening temperature is that 920 ℃, fusing time (1300 ℃) are that 4.0 minutes, viscosity (1300 ℃) are 1030 ℃ for 0.7Po, temperature of solidification; Adopt the cast of tundish immerseable long nozzle, and blow the Ar protection; The mode that induction stirring adopted for alternately, continuously, two groups reverse, output frequency is 5Hz, electric current is 500A; Casting machine throwing starting speed is that 0.3m/min, the highest casting speed are 0.7m/min, and the specifications section of strand is 300 * 1650mm, and be 37 minutes the duration of pouring of whole jar of steel.
Claims (2)
1. the method for a converter smelting medium carbon alloy steel is characterized in that: adopt converter+furnace outer refining technology, furnace outer refining technology comprises that LF stove VD method and line feeding handle; Wherein, molten steel is 50-70 minute through the LF stove treatment time, and taking out of temperature is 1640 ℃-1650 ℃; When molten steel was handled by the VD method, the dwell time was 15-25 minute, and taking out of temperature is 1530 ℃-1570 ℃; Xiang Gangzhong feeding Si-Ca line traffic control is at the 500m-1000m/ jar.
2. a revolving furnace continuous casting is produced the method for medium carbon alloy steel, it is characterized in that: adopt tundish immerseable long nozzle, electromagnetic agitating technology and blow Ar protection cast; Wherein, the long nozzle diameter is ￠ 45mm; The mode that induction stirring adopts for alternately, continuously, two groups reverse, output frequency is 2-8Hz, electric current is 450A-650A; The starting casting speed of casting machine is 0.3m/min, and the standard casting speed is 0.7m/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101875404A CN102021263A (en) | 2009-09-22 | 2009-09-22 | Method for producing medium carbon alloy steel by melting and continuous casting in converter |
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| CN2009101875404A CN102021263A (en) | 2009-09-22 | 2009-09-22 | Method for producing medium carbon alloy steel by melting and continuous casting in converter |
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| CN102021263A true CN102021263A (en) | 2011-04-20 |
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| CN2009101875404A Pending CN102021263A (en) | 2009-09-22 | 2009-09-22 | Method for producing medium carbon alloy steel by melting and continuous casting in converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102758051A (en) * | 2012-04-23 | 2012-10-31 | 西宁特殊钢股份有限公司 | Method for producing special steel through high-cleanness low-oxygen content process of rotating furnace |
| CN106086693A (en) * | 2016-07-07 | 2016-11-09 | 袁书强 | A kind of low cost hydraulic pump material and preparation technology thereof |
-
2009
- 2009-09-22 CN CN2009101875404A patent/CN102021263A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102758051A (en) * | 2012-04-23 | 2012-10-31 | 西宁特殊钢股份有限公司 | Method for producing special steel through high-cleanness low-oxygen content process of rotating furnace |
| CN106086693A (en) * | 2016-07-07 | 2016-11-09 | 袁书强 | A kind of low cost hydraulic pump material and preparation technology thereof |
| CN106086693B (en) * | 2016-07-07 | 2017-11-28 | 袁书强 | A kind of preparation technology for the inexpensive hydraulic pressure material pump for being suitable for covering process for copper |
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Application publication date: 20110420 |