CN102990025A - Medium carbon steel casting powder for H-section steel continuous casting - Google Patents
Medium carbon steel casting powder for H-section steel continuous casting Download PDFInfo
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- CN102990025A CN102990025A CN2011102764938A CN201110276493A CN102990025A CN 102990025 A CN102990025 A CN 102990025A CN 2011102764938 A CN2011102764938 A CN 2011102764938A CN 201110276493 A CN201110276493 A CN 201110276493A CN 102990025 A CN102990025 A CN 102990025A
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- covering slag
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Abstract
The invention relates to medium carbon steel casting powder for H-section steel continuous casting, belonging to the technical field of steelmaking and continuous casting. The medium carbon steel casting powder comprises the following components in percentage by weight: 33-39 percent of CaO, 35-39 percent of SiO2, 4-7 percent of Al2O3, 0-3 percent of MgO, 5-9 percent of F<->, 10-12 percent of Na2O, and balance of composite carbon which comprises 7 percent of graphite and 1-2.5 percent of carbon black, wherein the CaO and the SiO2 are used as base materials; and the Na2O, the MgO, the Al2O3 and the F<-> are used as flux. A preparation process comprises two steps, i.e. the step of producing pre-molten materials and the step of producing finished product casting powder. The prepared casting powder has physical properties that the melting point is 1080-1096DEG C, the viscosity at 1300DEG C is 0.17-0.35Pa.s and the melting speed is 30-40s. The thickness of the molten flux layer of the casting powder is 10-13mm. According to the requirement of carbon steel on the casting powder during production of an H-section steel continuous casting machine, the flux film control goals of lower melting temperature, lower viscosity, proper melting speed and higher thermal resistance are realized, and the situation that the surface of a casting blank is longitudinally cracked because the temperature gradient of the cross section of the casting blank is too large is avoided. The medium carbon steel casting powder has a better using effect than the using effect of domestic and foreign similar products, and can fully meet the process requirement on the carbon steel during H-section steel continuous casting.
Description
Technical field
The present invention relates to H shaped steel continuous casting medium carbon steel covering slag, belong to the steel-making continuous casting technical field.Be specifically related to a kind of H shaped steel continuous casting medium carbon steel covering slag and preparation method thereof
Background technology
In molten steel continuous pouring process, covering slag is added on the interior molten steel surface of crystallizer, and its effect can be summarized as 5 points: 1) exposed molten steel adiabatic heat-insulation; 2) prevent secondary oxidation of steel; 3) float to being mingled with of molten steel surface in the absorption; 4) filling liquid slag film between crystallizer wall and base shell plays lubrication; 5) the control strand is to the heat transfer of crystallizer.Above-mentioned covering slag five greatly on, the lubricated and Heat Transfer Control between crystallizer and base shell is particularly important.Lubrication is by the decision of covering slag vitrifying performance, and Heat Transfer Control is determined by crystal property.Yet the two is contradiction, and the covering slag crystal property that greasy property is good is relatively poor, and the good covering slag of crystal property, the Heat Transfer Control ability is strong, and lubricant effect is poor.Lubricated and Heat Transfer Control compares, and lubrication is even more important, and only under the prerequisite that guarantees the casting direct motion, Heat Transfer Control prevents the generation of crackle.
For large specification H shaped steel Hot Metal in Beam Blank, the lubricated and Heat Transfer Control between crystallizer and base shell is particularly important.Particularly because the restriction of its mold shape is higher to the mold flux property requirement, avoid the interior covering slag slag non-uniform film thickness of crystallizer to cause the slab cooling inequality to crack.Therefore, in order to obtain satisfied product quality, H shaped steel continuous crystallizer protecting slag must satisfy following requirement: 1) suitable burn-off rate, the consumption that can in time replenish melt cinder; 2) high melt cinder inflow capacity obtains larger slag consumption and equally distributed slag film, to satisfy the requirement of lubrication of crystallizer; 3) the slag film is even between crystallizer and strand, and strand is conducted heat evenly, prevents the generation of crackle; 4) for the crack sensitivity steel grade, the slag film should have higher thermal resistance, prevents that hot-fluid is excessive, causes stress to concentrate; 5) stablize rational melting structure, can be owing to pulling rate affect slag layer thickness than great fluctuation process.
Aborning, the steel grade that H shaped steel is mainly poured into a mould has Q235B, its chemical composition such as following table 1:
Table 1 Q235B chemical composition scope/%
By the composition of this steel grade as seen, this steel grade is medium carbon steel, structure is near the peritectoid district, has strong crack sensitivity, δ when solidifying → γ phase transformation is attended by 0.38% volume contraction, easily causes the air gap thickness between solidified shell and crystallizer wall inhomogeneous, and then the uniformity of impact heat transfer, produce stronger thermal stress, make casting billet surface produce lobe.This just needs the heat flux of limiting crystal device, and claimed slag has larger thermal resistance, realizes " the weak cooling " of crystallizer.Therefore; according to the Solidification Characteristics of this steel grade and in conjunction with the characteristics of multibreak of H shaped steel continuous casting special-shaped; covering slag should be designed to have higher basicity, the characteristics of lower fusion temperature and viscosity, suitable burn-off rate, can not mechanically indiscriminately imitate the covering slag technical indicator under the basic technology condition.H shaped steel medium carbon steel billet continuous casting machine production status is at present: not yet find effective covering slag technical solution under the H shaped steel continuous casting process, cause H shaped steel conticaster to have an accident because covering slag does not mate more, cc billet surface quality is difficult to control.
Summary of the invention
The object of the invention is to for above-mentioned deficiency of the prior art, provide a kind of H shaped steel continuous casting medium carbon steel covering slag, this covering slag good physical and chemical properties; fusing point is low, and viscosity is low, and molten speed suitably; greasy property is good; can crystallization control the device heat-transfer capability, can adapt to the technological requirement of H shaped steel continuous casting Q235B steel grade, reduce or avoid the bonding of base shell and crystallizer; the slag film is even between crystallizer and strand; strand is conducted heat evenly, prevent that the generation of crackle from reducing slab surface crack, improve the quality of products.
Technical scheme of the present invention and technical characterictic are:
The present invention is a kind of H shaped steel continuous casting medium carbon steel covering slag and preparation method thereof, it is characterized in that this kind covering slag is used for the continuous casting production of H shaped steel Q235B steel grade, and slab surface crack is reduced, and significantly improves cc billet surface quality.This covering slag is composed as follows by weight percentage: CaO33～39%, SiO
235～39%, Al
2O
34～7%, MgO 0～3%, F
-5～9%, Na
2O 10～12%, wherein adopt the compound carbon of joining: graphite 7%, carbon black 1～2.5%.
With CaO, SiO
2Be base-material, with Na
2O, MgO, Al
2O
3, F
-Be flux, wherein, F
-And Na
2O and an amount of Al
2O
3Main Function be to reduce melt temperature, can also reduce covering slag viscosity.
Adopt the compound carbon of joining: graphite 7% and carbon black 1～2.5%, make the covering slag burn-off rate suitable, slag layer thickness is suitable.
Preparation technology comprises that producing pre-melt formed with two steps of covering slag that manufacture a finished product, the production process of pre-molten material process is as follows: the particle that lime stone, quartz sand, cullet and fluorite etc. is broken into 0.1～1mm according to proportioning, then mix with soda ash and sodium fluoride powder raw material, agglomeration, dry, enter stove fusing, for subsequent use after condensation, fragmentation again; Finished product protection slag production process is as follows: get above-mentioned pre-melt through water mill slurrying, mist projection granulating, screening, cooling, detection, packing, make the finished product protection slag.
Prepared covering slag physical property is: 1080～1096 ℃ of fusing points, viscosity (1300 ℃) 0.17～0.35Pas, molten speed 30～34s.Covering slag liquid slag layer thickness is 10～13mm.
The present invention produces medium carbon steel to the requirement of covering slag according to H shaped steel conticaster; namely for the strong crack sensitivity of medium carbon steel; easily cause the air gap thickness between solidified shell and crystallizer wall inhomogeneous; the inhomogeneous characteristics of conducting heat; in conjunction with the characteristics of multibreak of H shaped steel continuous casting special-shaped, this H of design invention shaped steel continuous casting medium carbon steel covering slag.This covering slag has lower fusion temperature, viscosity, and suitable burn-off rate and larger thermal resistance can be avoided really realizing " the weak cooling " of crystallizer because of the excessive casting billet surface lobe that causes of strand cross section thermograde.This Realization of Product H shaped steel connect dreg casting film control target, provide guarantee for coordinating the lubricated and Heat Transfer Control of strand.Covering slag of the present invention melts in crystallizer and has good uniformity, the slag bar seldom, liquid slag layer thickness is at 10～13mm.Crystallizer is wide, the leptoprosopy heat flow density is distributed rationally, and crystallizer thermography real-time is normal, reduces or avoid the bonding of base shell and crystallizer, reduces slab surface crack, and cc billet surface quality is good, and qualification rate reaches more than 99%.Its result of use surpasses similar products at home and abroad, can satisfy the technological requirement of H shaped steel continuous casting medium carbon steel fully.
The specific embodiment
Covering slag performance requirement of the present invention:
1080～1096 ℃ of fusing points, viscosity (1300 ℃) 0.17～0.35Pas, molten speed 30～34s.Covering slag liquid slag layer thickness is 10～13mm.
Raw materials of the present invention and chemical component weight percentage see the following form:
Embodiment 1
Lime stone, quartz sand, cullet and fluorite etc. are broken into the particle of 0.1～1mm with raw material, then with the powder raw material such as soda ash according to embodiment 1 described chemical composition require that (seeing the following form) mixes by a certain percentage, agglomeration, oven dry, in shaft furnace, melt as fuel with coke, after condensation, fragmentation, use as semi-finished product.Pre-melt slag adopts large flow flush slag to force cooling to obtain the pre-melt of vitreum phase when coming out of the stove.Adopt different proportion graphite and carbon black to carry out the compound carbon of joining, through water mill slurrying, mist projection granulating, screening, cooling, detection, packing, make the finished product protection slag with above-mentioned pre-melt.Shown in finished product protection slag physicochemical property sees the following form.
Embodiment 2
The materials such as lime stone, quartz sand, cullet and fluorite are broken into the particle of 0.1～1mm, then with the powder raw material such as soda ash according to embodiment 2 described chemical compositions require that (seeing the following form) mixes by a certain percentage, agglomeration, oven dry, in shaft furnace, melt as fuel with coke, after condensation, fragmentation, use as semi-finished product.Pre-melt slag adopts large flow water yield flushing cinder to force cooling to obtain the pre-melt of vitreum phase when coming out of the stove.Adopt different proportion graphite and carbon black to carry out the compound carbon of joining, get above-mentioned pre-melt through water mill slurrying, mist projection granulating, screening, cooling, detection, packing, make the finished product protection slag.Shown in finished product protection slag physicochemical property sees the following form.
Embodiment 3
The materials such as lime stone, quartz sand, cullet and fluorite are broken into the particle of 0.1～1mm, then with the powder raw material such as soda ash according to embodiment 3 described chemical compositions require that (seeing the following form) mixes by a certain percentage, agglomeration, oven dry, in shaft furnace, melt as fuel with coke, after condensation, fragmentation, use as semi-finished product.Pre-melt slag adopts large flow water yield flushing cinder to force cooling to obtain the pre-melt of vitreum phase when coming out of the stove.Adopt different proportion graphite and carbon black to carry out the compound carbon of joining, get above-mentioned pre-melt through water mill slurrying, mist projection granulating, screening, cooling, detection, packing, make the finished product protection slag.Shown in finished product protection slag physicochemical property sees the following form.
Claims (5)
1. the present invention is a kind of H shaped steel continuous casting medium carbon steel covering slag and preparation method thereof, it is characterized in that this kind covering slag is used for the continuous casting production of H shaped steel Q235B steel grade, and slab surface crack is reduced in a large number, improves cc billet surface quality.This covering slag comprises by weight percentage following component and forms: CaO 33～39%, SiO
235～39%, Al
2O
34～7%, MgO 0～3%, F
-5～9%, Na
2O 10～12%, wherein adopt the compound carbon of joining: graphite 7%, carbon black 1～2.5%.
2. a kind of H shaped steel continuous casting as claimed in claim 1 is characterized in that with CaO, SiO with medium carbon steel covering slag and preparation method thereof
2Be base-material, with Na
2O, MgO, Al
2O
3, F
-Be flux, wherein, F
-And Na
2O and an amount of Al
2O
3Main Function be to reduce melt temperature, can also reduce covering slag viscosity.
3. a kind of H shaped steel continuous casting as claimed in claim 1 is characterized in that adopting the compound carbon of joining with medium carbon steel covering slag and preparation method thereof: graphite 7% and carbon black 1～2.5%, and make the covering slag burn-off rate suitable, slag layer thickness is suitable.
4. a kind of H shaped steel continuous casting as claimed in claim 1 is with medium carbon steel covering slag and preparation method thereof, it is characterized in that: it forms by producing pre-melt and two steps of covering slag that manufacture a finished product, described production process of pre-molten material process is as follows: the particle that lime stone, quartz sand, cullet and fluorite etc. is broken into 0.1～1mm according to proportioning, then mix with soda ash and sodium fluoride powder raw material, agglomeration, dry, enter stove fusing, for subsequent use after condensation, fragmentation again; Described finished product protection slag production process is as follows: get above-mentioned pre-melt through water mill slurrying, mist projection granulating, screening, cooling, detection, packing, make the finished product protection slag.
5. a kind of H shaped steel continuous casting as claimed in claim 1 is characterized in that prepared covering slag physical property is: 1080～1096 ℃ of fusing points, viscosity (1300 ℃) 0.17～0.35Pas, molten speed 30～34s with medium carbon steel covering slag and preparation method thereof.Covering slag liquid slag layer thickness is 10～13mm.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103331426A (en) * | 2013-06-03 | 2013-10-02 | 西峡县恒冠冶金材料有限公司 | Special continuous casting powder for high-speed railway steel |
| CN103801666A (en) * | 2014-02-24 | 2014-05-21 | 江苏苏南重工机械科技有限公司 | High-performance heat-preservation covering agent for thick slab and preparing method of high-performance heat-preservation covering agent |
| CN105522130A (en) * | 2016-03-09 | 2016-04-27 | 西峡龙成冶金材料有限公司 | Medium carbon steel chamfering copper plate continuous casting mold covering slag and preparation method thereof |
| CN106269158A (en) * | 2016-08-25 | 2017-01-04 | 贺州市创伟冶金耐材有限公司 | A kind of production method making steel covering slag |
| CN108580822A (en) * | 2018-07-09 | 2018-09-28 | 西峡龙成冶金材料有限公司 | A kind of continuous crystallizer protecting slag of high viscosity Hot Metal in Beam Blank medium carbon steel or low-alloy steel |
| CN116833409A (en) * | 2021-11-29 | 2023-10-03 | 河冶科技股份有限公司 | Method for preparing precipitation hardening high-speed steel by powder metallurgy process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103801666A (en) * | 2014-02-24 | 2014-05-21 | 江苏苏南重工机械科技有限公司 | High-performance heat-preservation covering agent for thick slab and preparing method of high-performance heat-preservation covering agent |
| CN103801666B (en) * | 2014-02-24 | 2015-12-02 | 江苏苏南重工机械科技有限公司 | A kind of wide and thick slab high-performance thermal-insulating covering agent and preparation method thereof |
| CN105522130A (en) * | 2016-03-09 | 2016-04-27 | 西峡龙成冶金材料有限公司 | Medium carbon steel chamfering copper plate continuous casting mold covering slag and preparation method thereof |
| CN106269158A (en) * | 2016-08-25 | 2017-01-04 | 贺州市创伟冶金耐材有限公司 | A kind of production method making steel covering slag |
| CN108580822A (en) * | 2018-07-09 | 2018-09-28 | 西峡龙成冶金材料有限公司 | A kind of continuous crystallizer protecting slag of high viscosity Hot Metal in Beam Blank medium carbon steel or low-alloy steel |
| CN108580822B (en) * | 2018-07-09 | 2020-01-24 | 西峡龙成冶金材料有限公司 | Continuous casting crystallizer casting powder of high-viscosity special-shaped blank medium carbon steel or low alloy steel |
| CN116833409A (en) * | 2021-11-29 | 2023-10-03 | 河冶科技股份有限公司 | Method for preparing precipitation hardening high-speed steel by powder metallurgy process |
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Application publication date: 20130327 |