CN102534094A - Method for producing tire cord steel wire by converter billet continuous casting process - Google Patents
Method for producing tire cord steel wire by converter billet continuous casting process Download PDFInfo
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- CN102534094A CN102534094A CN2012100006051A CN201210000605A CN102534094A CN 102534094 A CN102534094 A CN 102534094A CN 2012100006051 A CN2012100006051 A CN 2012100006051A CN 201210000605 A CN201210000605 A CN 201210000605A CN 102534094 A CN102534094 A CN 102534094A
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Abstract
The invention relates to a method for producing a tire cord steel wire according to a converter billet continuous casting process and belongs to the technical field of production of tire cord steel wires in the field of ferrous metallurgy. The method comprises the following process steps: desulfurizing by pre-treating molten iron, namely desulfurizing by spraying magnesium on a foundry ladle; smelting by using a converter, namely deoxidizing and alloying, modifying steel ladle slag, re-carburizing the molten iron and adding low-alkalinity pre-melted slag into the steel ladle after tapping; adding ferro-silicon alloy, manganese iron alloy and micronitrogen carburant in the tapping process and re-carburizing; and in the refining process and after the refining is finished, rolling the wire at high speed by adopting a two-stage steel ladle bottom blowing argon system and adopting billet continuous casting of 130mm*130mm or 160mm*160mm. The method has the advantages that: the production is reduced; the production efficiency is improved; and the method is particularly suitable for development and production of tire cord steel products in steel enterprises without big billet or rectangular billet continuous casting and without vacuum treatment equipment.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, particularly a kind of method through converter continuous small-billet casting explained hereafter cord steel wire rod.
Background technology
The cord steel wire rod is described as " superfine product in the wire rod ", is mainly used in to produce automobile and plane tyre meridian.The course of processing of cord steel wire rod is very complicated; And require very strict to the wire broken rate of whole machining process process; Therefore the homogeneity of wire raw material wire rods tissue and composition, cleanliness factor, drawing property and the surface quality of steel are all had very strict requirement, the production difficulty is big.
At present, the manufacturer of external cord steel comprises that Japan Kobe, Nippon Steel, Korea S's Posco, Germany spreads this top grade; Domestic manufacturer comprises Wuhan Iron and Steel Plant, Baosteel, Anshan iron and steel plant, blue or green steel and Sha Gang etc.Can be divided into two kinds of converter process and eaf processes by the steel-making mode, eaf process is because power consumption cost is higher, and the producer of employing is less relatively, and most of producers adopt converter process to carry out the production of cord steel.Converter cord steel production process route mainly comprises following several kinds:
Route 1: hot metal pretreatment → converter → LF → RH (VD) → large rectangle base continuous casting → cogging (reconditioning) → rolling
Route 2: hot metal pretreatment → converter → LF → RH (VD) → die casting → cogging (reconditioning) → rolling
Route 3: hot metal pretreatment → converter → LF → RH (VD) → continuous small-billet casting (induction stirring+gently depress) → rolling
Route 1 and 2 all adopts two pyrogene material methods, promptly is split into the little square billet of 140-150mm by large rectangle base or die casting base through breaking down, carries out reconditioning then, is rolled into wire rod through high-speed wire factory again.Route 3 uses the little square billet production of converter cord steel, need not adopt the breaking down cogging, but adopt vacuum-treat (RH or VD), and continuous caster has adopted the equipment of gently depressing.
Though above method helps improving the quality of cord steel, cogging second-heating operation, strand reconditioning and vacuum-treat operation, not only comprehensive cost is higher, and the production cycle is longer relatively, has reduced production efficiency.In addition, for the middle-size and small-size iron and steel enterprise that does not possess above appointed condition, be difficult to carry out the production exploitation of cord steel product.
Summary of the invention
The object of the present invention is to provide a kind of method through converter continuous small-billet casting explained hereafter cord steel wire rod.Adopt converter continuous small-billet casting technology, through desulfurizing iron, converter smelting, LF ladle refining, continuous small-billet casting, high-speed wire rolling, production cord steel wire rod.
Concrete process step is following:
(1) molten iron pretreatment desulfurizing: adopt the desulfurization of hot metal ladle spray magnesium, magnesium powder consumption 0.6-3.0kg/ ton iron, the massfraction of sulphur is 0.002-0.005% in the desulfurized molten iron.
(2) converter smelting: the end point carbon massfraction is controlled at 0.10-0.30%, terminal temperature 1560-1620 ℃.
(3) tapping process control: comprise deoxidation alloying, ladle slag upgrading and molten steel recarburization; The tapping back adds low basicity pre-melted slag (basicity R (CaO/SiO in ladle
2): 0.8-1.2), add-on is steel 0.5-3.0kg per ton; Add ferro-silicon in the tapping process, add-on is steel 1.0-3.0kg per ton, adds manganeseirom, and add-on is steel 3.0-6.0kg per ton, deoxidation and alloying; Add nitrogen carburelant carburetting in a subtle way in the tapping process, add-on is a 3.0-6.0kg/ ton steel, and the massfraction of nitrogen is less than 0.1% in the carburelant.
(4) LF ladle refining: adopt CaC
2Diffusive deoxidation, control top basicity of slag R is 0.6-1.3.Two-section type steel ladle bottom argon blowing system is adopted in refining process and end back; Argon blowing rate is 200-500Nl/min in the refining process; Finishing the back argon blowing rate is 50-200Nl/min, according to ladleful molten steel is stopped Argon and is controlled to be 5-30min to opening the calm time of watering.The LF refining cycle is 50-70min.
(5) continuous small-billet casting: adopt 130mm * 130mm or 160mm * 160mm continuous small-billet casting, adopt mold induction stirring or mold to add terminal electromagnetic agitating technology, 130mm square billet pulling rate 2.0-3.0m/min, 160mm square billet pulling rate 1.0-2.0m/min.
(6) high-speed wire rolling: wherein start rolling temperature is 1020 ± 50 ℃, 870 ± 50 ℃ of laying temperatures.The cooling of employing Stanermo wind-cooling linear, blower fan is opened 4 or 5.When blower fan is opened 4, preceding 3 typhoon machine open degree 80-100%, the 4th typhoon machine open degree 60-80%; When blower fan is opened 5, preceding 3 typhoon machine open degree 80-100%, back 2 typhoon machine open degree 60-80%.Rolling specs: Φ 5.0-5.5mm.
The invention has the advantages that:
1, adopt 130mm or 160mm continuous small-billet casting, directly rolling, need not pass through the breaking down cogging; Through control casting process technology, guarantee slab surface quality, need the strand reconditioning not compared with the technology that adopts breaking down cogging two pyrogene materials, cost significantly reduces.
2, adopt the simply connected refinery practice, i.e. converter, LF refining and continuous small-billet casting are compared with adopting RH (VD) vacuum-treat duplex refinery practice route, have not only reduced ton steel cost, and every stove production cycle reduced 30-50min, production efficiency obviously improves.
3, in the present invention, converter carburetting process adopts little nitrogen carburelant, can effectively reduce carburelant nitrogen pick-up, reduces nitrogen in steel content.
4, the present invention adopts diffusive deoxidation at the LF refining process, and reductor is CaC
2, reduce oxygen content in steel and also change inclusion and form, utilize its with steel in the CO gas that generates of oxygen reaction make the slag foaming, play the effect of inhibition molten steel nitrogen pick-up.
5, require inclusion that the adequate time collision is arranged after LF refining and blowing argon gas are handled, assemble removals of growing up and float, the present invention proposes behind the LF refining soft blow argon to opening the calm concept of time that waters, and according to the ladleful difference, the calmness time is controlled at 5-30min.
6, this invention can reduce production costs and enhance productivity, and is specially adapted to not possess bloom or rectangular billet caster, and the iron and steel enterprise that does not possess vacuum treatment device carries out cord steel Products Development and production.
Embodiment
Embodiment 1:
1, molten iron pretreatment desulfurizing:
Desulfurization magnesium powder consumption 1.9kg/ ton iron, the massfraction that takes off back molten iron sulphur is 0.003%.
2, process for making and correlation parameter:
The massfraction of going into stove molten iron sulphur is 0.003%, and 85.2 tons of Intake Quantitys, end point carbon massfraction are 0.19%, terminal temperature T:1600 ℃, adds ferro-silicon 2.2kg/ ton steel during tapping, manganeseirom 5.0kg/ ton steel; The tapping back adds low basicity pre-melted slag 1.20kg/ ton steel, and little nitrogen carburelant 5.0kg/ ton steel adopts the pushing off the slag tapping, following quantity of slag 10kg/ ton steel.
LF refining process top basicity of slag R is 0.95.Refining two-section type BOTTOM ARGON BLOWING flow is respectively 400Nl/min and 60Nl/min, calm time 10min, and the LF refining cycle is 55min.
Adopt the 130mm continuous small-billet casting, pulling rate 2.1m/min, mold stirring parameter are electric current: 250A, frequency: 8HZ.
3, rolling technology and correlation parameter:
Start rolling temperature: 990 ℃, laying temperature: 900 ℃.Blower fan is opened 5,1-3 blower fan open degree 100%, 4-5 blower fan open degree 80%.
4, quality product
(1) inclusion grading: A, C class≤1.0 grade, B, D class≤0.5 grade, inclusion longitudinal size≤8 μ m.
(2) wire rod center segregation≤2.0 grade.
(3) wire rod tensile strength 1080-1140Mpa, reduction of area 40-46%.
(4) wire rod does not almost have fracture of wire being used for producing in Φ 0.25mm and the Φ 0.22mm gauge steel cord process drawing process, and plying process wire broken rate＜3.0 time/ton steel satisfies the user requirement.
Embodiment 2:
1, molten iron pretreatment desulfurizing:
Desulfurization magnesium powder consumption 1.7kg/ ton iron, the massfraction that takes off back molten iron sulphur is 0.005%.
2, process for making and correlation parameter:
Going into stove molten iron sulphur massfraction is 0.005%, and 217.5 tons of Intake Quantitys, end point carbon massfraction are 0.16%, and terminal temperature T:1585 ℃, tapping adds ferro-silicon 2.0kg/ ton steel, manganeseirom 5.1kg/ ton steel; The tapping back adds low basicity pre-melted slag 1.35kg/ ton steel, and little nitrogen carburelant 5.8kg/ ton steel adopts the pushing off the slag tapping, following quantity of slag 12kg/ ton steel.
LF refining process top basicity of slag R is 1.04.Refining two-section type bottom blowing flow is respectively 450Nl/min and 50Nl/min, calm time 13min, and the LF refining cycle is 58min.
Adopt the 160mm continuous small-billet casting, pulling rate 1.70m/min, mold stirring parameter are electric current: 400A, frequency: 6HZ.
3, rolling technology and correlation parameter
Start rolling temperature: 1000 ℃, laying temperature: 890 ℃.Blower fan is opened 5,1-3 blower fan open degree 100%, 4-5 blower fan open degree 80%.
4, quality product
(1) inclusion grading: A, C class≤1.0 grade, B, D class≤0.5 grade, inclusion longitudinal size≤8 μ m.
(2) wire rod center segregation≤2.0 grade.
(3) wire rod tensile strength 1130-1160Mpa, reduction of area 39-43%.
(4) wire rod is produced in Φ 0.30mm and the Φ 0.33mm gauge steel cord process drawing process and is not almost had fracture of wire being used for thermal treatment process, and the process of pooling capital wire broken rate＜3.0 time/ton steel satisfies the user requirement.
Claims (6)
1. method through converter continuous small-billet casting explained hereafter cord steel wire rod is characterized in that process step is:
(1) molten iron pretreatment desulfurizing: the desulfurization of hot metal ladle spray magnesium, magnesium powder consumption 0.6-3.0kg/ ton iron, the massfraction that takes off back molten iron sulphur is 0.002-0.005%;
(2) converter smelting: the end point carbon massfraction is 0.10-0.30%, terminal temperature 1560-1620 ℃;
(3) tapping process control: comprise deoxidation alloying, ladle slag upgrading and molten steel recarburization; The tapping back adds low basicity pre-melted slag in ladle, add-on is steel 0.5-3.0kg per ton; Add ferro-silicon in the tapping process, add-on is steel 1.0-3.0kg per ton, adds manganeseirom, and add-on is steel 3.0-6.0kg per ton, deoxidation and alloying; The little nitrogen carburelant carburetting that adds 3.0-6.0kg/ ton steel in the tapping process;
(4) LF ladle refining: CaC
2Diffusive deoxidation, top basicity of slag R is 0.6-1.3, and argon blowing rate is 200-500Nl/min in the refining process, and finishing the back argon blowing rate is 50-200Nl/min, stops Argon to opening the calm time of watering according to ladleful control molten steel, and the LF refining cycle is 50-70min;
(5) continuous small-billet casting: adopt 130mm * 130mm or 160mm * 160mm continuous small-billet casting, adopt mold induction stirring or mold to add terminal induction stirring, 130mm square billet pulling rate 2.0-3.0m/min, 160mm square billet pulling rate 1.0-2.0m/min;
(6) high-speed wire rolling: wherein start rolling temperature is 1020 ± 50 ℃, 870 ± 50 ℃ of laying temperatures.The cooling of employing Stanermo wind-cooling linear, blower fan is opened 4 or 5.
2. according to the said method of claim 1, it is characterized in that, described in the step (3) in the carburelant massfraction of nitrogen less than 0.1%.
3. according to the said method of claim 1, it is characterized in that the basicity R of low basicity pre-melted slag is 0.8-1.2 described in the step (3).
4. according to the said method of claim 1, it is characterized in that the calm time described in the step (4) is 5-30min.
5. according to the said method of claim 1, it is characterized in that the rolling specs described in the step (6) is Φ 5.0-5.5mm.
6. according to the said method of claim 1, it is characterized in that the blower fan open degree described in the step (6) is: when blower fan is opened 4, preceding 3 typhoon machine open degree 80-100%, the 4th typhoon machine open degree 60-80%; When blower fan is opened 5, preceding 3 typhoon machine open degree 80-100%, back 2 typhoon machine open degree 60-80%.
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| CN102851447A (en) * | 2012-09-11 | 2013-01-02 | 首钢总公司 | Outside-furnace refining production method of steel used in carbon steel welding wire |
| CN102851433A (en) * | 2012-08-29 | 2013-01-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling content of nitrogen in semi-steel smelted tire cord steel or hard wire steel |
| CN102864275A (en) * | 2012-09-25 | 2013-01-09 | 鞍钢股份有限公司 | Control method of aluminum content of heavy rail steel |
| CN103103307A (en) * | 2013-01-24 | 2013-05-15 | 首钢总公司 | Method for producing steel for low-nitrogen stranded wire by use of non-vacuum process of converter |
| CN103111472A (en) * | 2013-01-24 | 2013-05-22 | 首钢总公司 | Method for controlling free ferrite content of tire cord steel |
| CN103397156A (en) * | 2013-07-25 | 2013-11-20 | 张家港市胜达钢绳有限公司 | Wire manufacturing method |
| CN103966386A (en) * | 2014-05-12 | 2014-08-06 | 河北钢铁股份有限公司邯郸分公司 | Less slag smelting process for tire cord steel |
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| CN110724782A (en) * | 2019-10-12 | 2020-01-24 | 南京钢铁股份有限公司 | Method for recycling residual steel and acid slag of cord steel |
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| CN102851433A (en) * | 2012-08-29 | 2013-01-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling content of nitrogen in semi-steel smelted tire cord steel or hard wire steel |
| CN102851433B (en) * | 2012-08-29 | 2014-06-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling content of nitrogen in semi-steel smelted tire cord steel or hard wire steel |
| CN102851447A (en) * | 2012-09-11 | 2013-01-02 | 首钢总公司 | Outside-furnace refining production method of steel used in carbon steel welding wire |
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