CN101580912A - Low carbon high sulfur free-cutting steel production process - Google Patents
Low carbon high sulfur free-cutting steel production process Download PDFInfo
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Abstract
The invention provides a low carbon high sulfur free-cutting steel production process, comprising the following steps: 1) an electric furnace is used to blow oxygen for melting without supplying electricity, the ratio of hot molten iron and waste steel reaches 7.0:1.0-3.0, a carbon-oxygen gun arranged on a furnace door and an oxygen-coal sublance gun arranged on a furnace wall are used for blowing oxygen for melting with rich carbon in the furnace; 2) the operation of eccentric bottom tapping and retained slag and steel are carried out, pre-deoxidation is processed on the furnace rear, then slag is produced; 3) low-basicity slag is produced in a refining furnace, the refined slag comprises the following components by weight percentage: 40-50% of CaO, 15-30% of SiO2, 20-35% of Al2O3 and 5-15% of MgO; when each element chemical composition in the steel reaches the requirements under the temperature of 1580-1600 DEG C, Ca lines or Ca-Si lines are put in the refining furnace, the time of soft blowing is 8-15min, crater formation modified atmosphere packaging is put on a continuous casting platform; 4) a four pass arc continuous casting machine is used for continuous casting, a long nozzle arch welding joint is used for sealing and protecting and argon is blown in an intermediate container to protect casting; low cooling process is adopted for secondary cooling, electromagnetic mixing is adopted by a crystallizer, wherein the electric current is 600-700A and the frequency is 4-5 Hz.
Description
Technical field
The present invention relates to a kind of producing and manufacturing technique of low carbon high sulfur free-cutting steel, particularly the low carbon high sulfur free-cutting steel production method of Consteel electric furnace+refining furnace+continuous casting.Belong to metallurgy industry.
Background technology
Free-cutting steel is to be the steel grade of prominent feature with outstanding machinability, because this steel grade has lower cutting force and cutting temperature in cutting process, the advantages such as work-ing life that smear metal is handled well, cutter is got well and improved to surface smoothness, and it is big to be widely used in the machining amount, in the industries such as the automobile that atomization degree is high, tractor, lathe, instrument and IT.Brought the cutting cost to reduce at double thus, quality product increases substantially with production efficiency and significantly improves.
External free-cutting steel mainly adopts arc melting+secondary refining+continuous casting process or converter smelting+secondary refining+continuous casting process to produce, and this technical maturity, reliable product quality have replaced the mode of production of arc melting+die casting gradually.External free-cutting steel typical production technical process mainly contains: many factories are known by Japanese Datong District: 70t EAF-LF-RH-CC (arc 2 streams, the vertical 4 stream circle base Φ 170-350 of 370mm * 480mm/)-breaking down cogging; Aichi, Janpan is known many factories: 80tEAF-LF-RH-CC (370mm * 480mm or 185mm * 185mm)-breaking down cogging or tandem rolling; The little storehouse of SUMITOMO CHEMICAL: KR-70BOF-70tVAD/RH-CC (410mm * 560mm).The producer of domestic production free-cutting steel mainly is a part special steel factory, resemble energy produced in small quantities such as the full special steel in north, Baosteel special steel, Shoudu Iron and Steel Co special steel, Kweiyang special steel, Chongqing special steel and emerging clear steel mill, and adopt electric furnace+mould to annotate technology mostly, have only minority steel mill to grope the continuous casting process of part free-cutting steel, and unstable product quality causes a large amount of free-cutting steels must rely on external import.The technical process of domestic part producing free-cutting steel steel mill is: the full special steel in north: 30EAF-EBT-40tLF-3.15t ingot steel casting; Kweiyang special steel: 60tEAF-LF-CC; Laiwu iron and steel: 15tEAF-steel ladle bottom argon blowing refining-685kg steel ingot.
The control of sulphur is the difficult point that free-cutting steel is produced in the resulfurizing series free cutting steel, and the recovery rate of sulphur has had a strong impact on sulphur content in the steel in its steel.At present mainly adopt that SULPHUR POWDER directly adds, troilite powder directly adds, methods such as the ferrous adding of industrial bright sulfur, sulphur or the adding of Iron sulfuret alloy core wire.But consider the pollution to environment and molten steel, the recovery rate and the cost problem of sulphur, commonplace and sophisticated technology is to feed sulphur line or sulfurous iron ore in ladle now.Influence the following aspects that mainly contains of sulphur recovery rate in the steel:
The one, the selection of slag system is for the white slag CaO-SiO2-Al2O3 slag system of non-free-cutting steel electrosmelting, because the desulfurization degree height (40%～70%) of slag is unfavorable to sulphur content in assurance and the stabilized steel.And the magnesia slag technology of the emerging clear Iron And Steel Company in Jiangyin exploitation, the desulfurization degree after sulphur is extremely tapped in its reduction furnace has only 5～10%, thereby has stablized the content of finished product sulphur.Magnesia slag technology mainly is to add certain MgO and firebrick piece on the basis of CaO-SiO2-Al2O3 slag system, and forming with MgO, SiO2 is the slag system of principal constituent, and according to the sulfur capacity Theoretical Calculation, the MgO sweetening power is the most weak, thereby guarantees the low desulfurization degree of slag system.
The 2nd, the basicity of slag: the basicity of slag is high more, and it is strong more that it takes off the S ability, relevant theory think this be since in the steel S because basic slag has more free O2-, thereby have bigger sweetening power easily by the displacement of the electric charge of free O2-in the slag.But for guaranteeing the partition ratio of S, slag must have certain basicity again, so adopted the basicity (1.5～2.5) that approaches neutral slag, can guarantee that bits do not absorb sulphur or absorb sulphur less in the steel.
Free-cutting steel is one of the world three steel grade of being difficult to continuous casting greatly, the difficult point of its continuous casting process exploitation mainly is: the elevated oxygen level of free-cutting steel, high sulfur content greatly reduce the surface tension of molten steel, make the slag separation difficulty, thereby cause slag to mix volume, form exhibiting high surface and surface defect, even cause bleed-out, make continuous casting production be difficult to carry out; Manganese, oxygen level height in the free-cutting steel, at high temperature can with some the composition generation physical and chemical reaction in the refractory materials, make the refractory materials etch, in continuous casting production, cause the phenomenons such as steel or tundish bleed-out of overflowing; Free-cutting steel molten steel viscosity is big, mobile poor, for guaranteeing that its watering property must improve teeming temperature, but free-cutting steel is again the responsive steel grade of crackle simultaneously, must adopt weak cold system, these conflicting requirements make free-cutting steel change very difficulty of continuous casting process into by die casting process, are once becoming continuous casting worker's forbidden zone.Therefore, in the free-cutting steel production process, continuous casting process control seems of crucial importance at present.
By above document as can be seen, the domestic research of relevant free-cutting steel production has much, is especially doing different research according to the condition of self aspect the free-cutting steel of the different trades mark, and is mostly from increasing easy cutting element or improving technology and set about.And the research of in the external report free-cutting steel being done is also more, and the especially Japanese research of doing in this respect is more, and has obtained a series of patent.At home and abroad, present stage free-cutting steel be divided into several series according to adding different easy cutting elements, as Pb system, Ca system, S system etc., but its production technique is basic identical, is mostly refining-secondary refining-continuous casting just.
In the document of being consulted, do not find and identical document of this problem and patent report.By above document as can be seen, the domestic research of relevant free-cutting steel production has much, is especially doing different research according to the condition of self aspect the free-cutting steel of the different trades mark, and is mostly from increasing easy cutting element or improving technology and set about.And the research of in the external report free-cutting steel being done is also more, and the especially Japanese research of doing in this respect is more, and has obtained a series of patent.At home and abroad, present stage free-cutting steel be divided into several series according to adding different easy cutting elements, as Pb system, Ca system, S system etc., but its production technique is basic identical, is mostly refining-secondary refining-continuous casting just.
Summary of the invention
The objective of the invention is to overcome the production technique difficult point of above free-cutting steel, propose a kind of producing and manufacturing technique of low carbon high sulfur free-cutting steel,, improve S recovery rate in the steel, the S content in the stabilized steel by S CONTROL PROCESS in the refining furnace; Control surface and the internal soundness that guarantees the free-cutting steel strand by technological processs such as continuous casting tank level control, induction stirring, sinusoidal vibration, continuous casting privacy protection slag, two cold controls, thereby solved the production problem of free-cutting steel.
Technical scheme of the present invention: the producing and manufacturing technique that a kind of low carbon high sulfur free-cutting steel is provided of the present invention the steps include:
1) adopt the oxygen blast under electric power thus supplied not of Consteel electric furnace to smelt, electric furnace hot metal charge and steel scrap ratio reach 7.0: 1.0～and 3.0, the alternately rich carbon melting of oxygen blast in stove of furnace door carbon oxygen lance and furnace wall coal oxygen sublance, chemical energy with the molten steel reaction replaces electric energy, has guaranteed smelting phase molten steel decarburized amount, smelting endpoint carbon and temperature;
2) eccentric furnace bottom stays steel to stay the slag tapping, carries out pre-deoxidation behind the stove, adds one or more alloyings of steel core aluminium, Ba-Ca-Si or composite refining reductor in ladle; Quickened lime is adopted in slag making then, slag making, and consumption: 6～8kg/t has reduced the oxygen level that enters the refining furnace molten steel and the oxidisability of slag;
3) refining furnace is made low basicity slag, and the composition of refining slag and part by weight are: CaO:40～50%, SiO
2: 15～30%, Al
2O
3: 20～35%, MgO:5～15%;
After element chemistry composition in the refining later stage steel except that S enters specification, feed the S line in refining furnace, and keep the intensity of steel ladle bottom argon blowing, the rate of recovery of S is 75～85%; The chemical ingredients of each element reaches necessary requirement in the steel, after temperature reaches 1580～1600 ℃, feeds Ca line or Ca-Si line in refining furnace, and soft blow time 8～15min can rise and cheat the upward continuous casting platform of stealthily substituting;
4) continuous casting adopts a machine four stream curved type continuous casters, and continuous casting comprises casting, one cold, two cold, aligning, several parts of flame cutting; Adopt long nozzle argon seam seal protection and the casting of tundish blowing argon, the submerged nozzle depth of penetration is 100～130mm, avoids molten steel to impact, and causes liquid fluctuating excessive; Two cold parts adopt weak cold technology, and crystallizer adopts induction stirring, and its electric current is 600～700A, and frequency is 4～5Hz.
Its step 4) continuous casting superheating temperature is controlled at 15～30 ℃.
Its crystallizer protecting residue employing basicity is 4 high basicity covering slag.
The producing and manufacturing technique of described low carbon high sulfur free-cutting steel, its two cold be weak cold technology, comprise four sections: sufficient roller section, active segment, canned paragraph I, canned paragraph II, all adopt aerosol cooling, the specific water is 0.30～0.35Kg/L, and pulling rate is 1.80～2.10m/min.
The producing and manufacturing technique of described low carbon high sulfur free-cutting steel, its aligning section temperature is 950～1050 ℃.
Advantage of the present invention: the production method of low carbon high sulfur free-cutting steel provided by the invention is compared with existing sulphur free-cutting steel Technology, mainly contains following beneficial effect:
1, production cost of the present invention is low, save energy;
2, technology circuit provided by the invention is simple, workable, is easy to control;
3, the S composition is easy to control, the recovery rate height of S;
4, continuous casting does not have bleed-out, has reduced industrial accident;
5, adopt induction stirring and weak but cold, strand does not have surface quality problems, has reduced the segregation of strand C, Mn, S.
The elevated oxygen level of free-cutting steel, high sulfur content greatly reduce the surface tension of molten steel, make the slag separation difficulty, thereby cause slag to mix volume, form exhibiting high surface and surface defect, even cause bleed-out, make continuous casting production be difficult to carry out; Simultaneously, manganese, oxygen level height in the free-cutting steel, at high temperature can with some the composition generation physical and chemical reaction in the refractory materials, make the refractory materials etch, in continuous casting production, cause the phenomenons such as steel or tundish bleed-out of overflowing; In addition; free-cutting steel molten steel viscosity is big; mobile poor; for guaranteeing that its watering property must improve teeming temperature; but free-cutting steel is again the responsive steel grade of crackle simultaneously; must adopt weak cold system; therefore, in the process technology scheme of the present invention, the continuous casting superheating temperature of free-cutting steel is controlled at 15～30 ℃; crystallizer protecting residue adopts special-purpose high basicity 4 covering slags; secondary cooling water adopts weak cold technology, its two cold four sections (sufficient roller sections; active segment; canned paragraph I; canned paragraph II) all adopt the aerosol cooling, the specific water is 0.30～0.35Kg/L; pulling rate is 1.80～2.10m/min, and aligning section temperature is 950～1050 ℃.
Embodiment
Adopt low carbon high sulfur free-cutting steel production method provided by the invention, produce sulphur free-cutting steel, its chemical ingredients mainly comprises (weight percent): C:0.14～0.20%, Si:0.17～0.37%, Mn:1.30～1.60%, P :≤0.040%, S:0.080～0.130%, all the other are iron and inevitably are mingled with.Its processing technology routine is: the heart stove of the inclined to one side end of Consteel electrosmelting-EBT stays steel to stay slag tapping-LF ladle furnace refining-CC curved type continuous caster continuous casting.The producing and manufacturing technique that a kind of low carbon high sulfur free-cutting steel is provided of the present invention the steps include:
1) adopt the oxygen blast under electric power thus supplied not of Consteel electric furnace to smelt, electric furnace hot metal charge and steel scrap ratio reach 7.0: 1.0～and 3.0, the alternately rich carbon melting of oxygen blast in stove of furnace door carbon oxygen lance and furnace wall coal oxygen sublance, chemical energy with the molten steel reaction replaces electric energy, has guaranteed smelting phase molten steel decarburized amount, smelting endpoint carbon and temperature;
2) eccentric furnace bottom stays steel to stay the slag tapping, carries out pre-deoxidation behind the stove, adds one or more alloyings of steel core aluminium, Ba-Ca-Si or composite refining reductor in ladle; Quickened lime is adopted in slag making then, slag making, and consumption: 6～8kg/t has reduced the oxygen level that enters the refining furnace molten steel and the oxidisability of slag;
3) refining furnace is made low basicity slag, and the composition of refining slag and part by weight are: CaO:40～50%, SiO
2: 15～30%, Al
2O
3: 20～35%, MgO:5～15%;
After element chemistry composition in the refining later stage steel except that S enters specification, feed the S line in refining furnace, and keep the intensity of steel ladle bottom argon blowing, the rate of recovery of S is 75～85%; The chemical ingredients of each element reaches necessary requirement in the steel, after temperature reaches 1580～1600 ℃, feeds Ca line or Ca-Si line in refining furnace, and soft blow time 8～15min can rise and cheat the upward continuous casting platform of stealthily substituting;
4) continuous casting adopts a machine four stream curved type continuous casters, and continuous casting comprises casting, one cold, two cold, aligning, several parts of flame cutting; Adopt long nozzle argon seam seal protection and the casting of tundish blowing argon, the submerged nozzle depth of penetration is 100～130mm, avoids molten steel to impact, and causes liquid fluctuating excessive; Two cold parts adopt weak cold technology, and crystallizer adopts induction stirring, and its electric current is 600～700A, and frequency is 4～5Hz.
The producing and manufacturing technique of described low carbon high sulfur free-cutting steel, its step 4) continuous casting superheating temperature is controlled at 15～30 ℃.
The producing and manufacturing technique of described low carbon high sulfur free-cutting steel, its crystallizer protecting residue employing basicity are 4 high basicity covering slag.
The producing and manufacturing technique of described low carbon high sulfur free-cutting steel, its two cold be weak cold technology, comprise four sections: sufficient roller section, active segment, canned paragraph I, canned paragraph II, all adopt aerosol cooling, the specific water is 0.30～0.35Kg/L, and pulling rate is 1.80～2.10m/min.
The producing and manufacturing technique of described low carbon high sulfur free-cutting steel, its aligning section temperature is 950～1050 ℃.
Embodiment 1:
(1) adopts the Consteel oxygen blast of electric furnace smelting technology of not powering, electric furnace hot metal charge and steel scrap ratio are 1.0, the alternately rich carbon melting of oxygen blast in stove of furnace door carbon oxygen lance and furnace wall matchmaker's oxygen sublance, chemical energy with the molten steel reaction replaces electric energy, smelting phase molten steel decarburized amount is 0.30%, smelting endpoint C content is 0.08%, 1630 ℃ of terminal temperatures.
(2) eccentric furnace bottom stays steel to stay slag tapping (EBT), carries out pre-deoxidation behind the stove, when tap reaches 1/3, adds steel core aluminium and composite refining reductor 0.5kg/t, ferrosilicon, ferromanganese or silicomanganese carry out alloying in ladle; When tap reaches 2/3, in ladle, add slag making materials: quickened lime consumption: 6kg/t.
(3) refining furnace (LF) is made low basicity slag, and the composition of refining slag and ratio are: CaO:40%, SiO
2: 25%, Al
2O
3: 25%, MgO:10%.Element chemistry composition in the refining later stage steel except that S is fed the S line after entering specification in refining furnace, S line feed quantity peace requires the middle upper limit control of composition, and keeps the intensity of steel ladle bottom argon blowing, and the rate of recovery of S is 85%.After the chemical ingredients of each element and temperature reach necessary requirement in the steel, feed Ca line or Ca-Si line in refining furnace, the soft blow time is 10min, rises then and cheats the upward continuous casting platform of stealthily substituting.
(4) continuous casting adopts long nozzle argon seam seal protection and the casting of tundish blowing argon; the submerged nozzle depth of penetration is 100mm; logic approach for mold level control is 800mm (length of mould is 1000mm), manually opens promptly to change automatic control after watering over to and water steel system (stop to open manually watering after watering steel).Crystallizer adopts induction stirring, and its electric current is 600A, and frequency is 4Hz.The continuous casting superheating temperature is 15 ℃,, and crystallizer protecting residue adopts special-purpose high basicity covering slag (basicity is 4).Secondary cooling water adopts weak cold technology, and its two cold four sections (sufficient roller section, active segment, canned paragraph I, canned paragraph II) all adopts the aerosol cooling, and the specific water is 0.30Kg/L, and pulling rate is 1.80m/min, and aligning section temperature is 1050 ℃.
Embodiment 2:
(1) adopts the Consteel oxygen blast of electric furnace smelting technology of not powering, electric furnace hot metal charge and steel scrap ratio are 2.0, the alternately rich carbon melting of oxygen blast in stove of furnace door carbon oxygen lance and furnace wall matchmaker's oxygen sublance, chemical energy with the molten steel reaction replaces electric energy, smelting phase molten steel decarburized amount is 0.45%, smelting endpoint C content is 0.10%, 1640 ℃ of terminal temperatures.
(2) eccentric furnace bottom stays steel to stay slag tapping (EBT), carries out pre-deoxidation behind the stove, when tap reaches 1/3, adds steel core aluminium and composite refining reductor 0.5kg/t, ferrosilicon, ferromanganese or silicomanganese carry out alloying in ladle; When tap reaches 2/3, in ladle, add slag making materials: quickened lime consumption: 7kg/t.
(3) refining furnace (LF) is made low basicity slag, and the composition of refining slag and ratio are: CaO:45%, SiO2:20%, Al2O3:20%, MgO:15%.Element chemistry composition in the refining later stage steel except that S is fed the S line after entering specification in refining furnace, S line feed quantity peace requires the middle upper limit control of composition, and keeps the intensity of steel ladle bottom argon blowing, and the rate of recovery of S is 80%.After the chemical ingredients of each element and temperature reach necessary requirement in the steel, feed Ca line or Ca-Si line in refining furnace, the soft blow time is 10min, rises then and cheats the upward continuous casting platform of stealthily substituting.
(4) continuous casting adopts long nozzle argon seam seal protection and the casting of tundish blowing argon; the submerged nozzle depth of penetration is 110mm; logic approach for mold level control is 800mm (length of mould is 1000mm), manually opens promptly to change automatic control after watering over to and water steel system (stop to open manually watering after watering steel).Crystallizer adopts induction stirring, and its electric current is 650A, and frequency is 4Hz.The continuous casting superheating temperature is 20 ℃, and crystallizer protecting residue adopts special-purpose high basicity covering slag (basicity is 4).Secondary cooling water adopts weak cold technology, and its two cold four sections (sufficient roller section, active segment, canned paragraph I, canned paragraph II) all adopts the aerosol cooling, and the specific water is 0.32Kg/L, and pulling rate is 1.95m/min, and aligning section temperature is 1000 ℃.
Embodiment 3:
(1) adopts the Consteel oxygen blast of electric furnace smelting technology of not powering, electric furnace hot metal charge and steel scrap ratio are 3.0, the alternately rich carbon melting of oxygen blast in stove of furnace door carbon oxygen lance and furnace wall matchmaker's oxygen sublance, chemical energy with the molten steel reaction replaces electric energy, smelting phase molten steel decarburized amount is 0.60%, smelting endpoint C content is 0.12%, 1650 ℃ of terminal temperatures.
(2) eccentric furnace bottom stays steel to stay slag tapping (EBT), carries out pre-deoxidation behind the stove, when tap reaches 1/3, adds steel core aluminium and composite refining reductor 0.5kg/t, ferrosilicon, ferromanganese or silicomanganese carry out alloying in ladle; When tap reaches 2/3, in ladle, add slag making materials: quickened lime consumption: 8kg/t.
(3) refining furnace (LF) is made low basicity slag, and the composition of refining slag and ratio are: CaO:50%, SiO2:20%, Al2O3:20%, MgO:10%.Element chemistry composition in the refining later stage steel except that S is fed the S line after entering specification in refining furnace, S line feed quantity peace requires the middle upper limit control of composition, and keeps the intensity of steel ladle bottom argon blowing, and the rate of recovery of S is 75%.After the chemical ingredients of each element and temperature reach necessary requirement in the steel, feed Ca line or Ca-Si line in refining furnace, the soft blow time is 13min, rises then and cheats the upward continuous casting platform of stealthily substituting.
(4) continuous casting adopts long nozzle argon seam seal protection and the casting of tundish blowing argon; the submerged nozzle depth of penetration is 120mm; logic approach for mold level control is 800mm (length of mould is 1000mm), manually opens promptly to change automatic control after watering over to and water steel system (stop to open manually watering after watering steel).Crystallizer adopts induction stirring, and its electric current is 700A, and frequency is 5Hz.The continuous casting superheating temperature is 35 ℃, and crystallizer protecting residue adopts special-purpose high basicity covering slag (basicity is 4).Secondary cooling water adopts weak cold technology, and its two cold four sections (sufficient roller section, active segment, canned paragraph I, canned paragraph II) all adopts the aerosol cooling, and the specific water is 0.35Kg/L, and pulling rate is 2.10m/min, and aligning section temperature is 950 ℃.
Adopt above-mentioned 3 kinds of embodiments, the low carbon high sulfur free-cutting steel macrostructure of its production is:
| Embodiment | Casting blank specification mm * mm | Central pipe (level) | Center porosity (level) | Non-metallic inclusion (level) |
| Scheme 1 | 150×150 | 0 | 0.5 | 0 |
| Scheme 2 | 150×150 | 0.5 | 0.5 | 0.5 |
| Scheme 3 | 150×150 | 0.5 | 1.0 | 0.5 |
Adopt above-mentioned 3 kinds of embodiments, S, Mn elements segregation are in the low carbon high sulfur free-cutting steel strand of its production:
Claims (5)
1. the producing and manufacturing technique of a low carbon high sulfur free-cutting steel the steps include:
1) adopt the oxygen blast under electric power thus supplied not of Consteel electric furnace to smelt, electric furnace hot metal charge and steel scrap ratio reach 7.0: 1.0～and 3.0, the alternately rich carbon melting of oxygen blast in stove of furnace door carbon oxygen lance and furnace wall coal oxygen sublance, chemical energy with the molten steel reaction replaces electric energy, has guaranteed smelting phase molten steel decarburized amount, smelting endpoint carbon and temperature;
2) eccentric furnace bottom stays steel to stay the slag tapping, carries out pre-deoxidation behind the stove, adds one or more alloyings of steel core aluminium, Ba-Ca-Si or composite refining reductor in ladle; Quickened lime is adopted in slag making then, slag making, and consumption: 6～8kg/t has reduced the oxygen level that enters the refining furnace molten steel and the oxidisability of slag;
3) refining furnace is made low basicity slag, and the composition of refining slag and part by weight are: CaO:40～50%, SiO2:15～30%, Al2O3:20～35%, MgO:5～15%; After element chemistry composition in the refining later stage steel except that S enters specification, feed the S line in refining furnace, and keep the intensity of steel ladle bottom argon blowing, the rate of recovery of S is 75～85%; The chemical ingredients of each element reaches necessary requirement in the steel, after temperature reaches 1580～1600 ℃, feeds Ca line or Ca-Si line in refining furnace, and soft blow time 8～15min can rise and cheat the upward continuous casting platform of stealthily substituting;
4) continuous casting adopts a machine four stream curved type continuous casters, and continuous casting comprises casting, one cold, two cold, aligning, several parts of flame cutting; Adopt long nozzle argon seam seal protection and the casting of tundish blowing argon, the submerged nozzle depth of penetration is 100～130mm, avoids molten steel to impact, and causes liquid fluctuating excessive; Two cold parts adopt weak cold technology, and crystallizer adopts induction stirring, and its electric current is 600～700A, and frequency is 4～5Hz.
2. the producing and manufacturing technique of low carbon high sulfur free-cutting steel according to claim 1, it is characterized in that: step 4) continuous casting superheating temperature is controlled at 15～30 ℃.
3. the producing and manufacturing technique of low carbon high sulfur free-cutting steel according to claim 1 and 2 is characterized in that: it is 4 high basicity covering slag that crystallizer protecting residue adopts basicity.
4. the producing and manufacturing technique of low carbon high sulfur free-cutting steel according to claim 1 and 2, it is characterized in that: it is two cold for weak cold technology, comprise four sections: sufficient roller section, active segment, canned paragraph I, canned paragraph II, all adopt the aerosol cooling, the specific water is 0.30～0.35Kg/L, and pulling rate is 1.80～2.10m/min.
5. according to the producing and manufacturing technique of claim 1 or 3 described low carbon high sulfur free-cutting steels, it is characterized in that: aligning section temperature is 950～1050 ℃.
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| CN102643950A (en) * | 2011-02-18 | 2012-08-22 | 北大方正集团有限公司 | Method for smelting sulfur containing steel for vehicle and sulfur containing steel |
| CN103014562A (en) * | 2012-12-19 | 2013-04-03 | 南京钢铁股份有限公司 | Control method for reducing air holes in surfaces of high-sulfur free-cutting steel casting billets of converter |
| CN104513931A (en) * | 2013-09-30 | 2015-04-15 | 北大方正集团有限公司 | Cold heading steel, cold heading steel ladle furnace refining process, and cold heading steel production process |
| CN105132620A (en) * | 2015-09-10 | 2015-12-09 | 山东西王特钢有限公司 | Cost-reducing steelmaking method |
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| CN1302126C (en) * | 2005-03-04 | 2007-02-28 | 宝钢集团上海五钢有限公司 | Method for producing low-carbon high-sulfur (sulfur-phosphorous) easy-to-cut structural steel continuous casting billet |
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2009
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