CN105132610A - Production method capable of controlling titanium inclusions of thin-size high-end tire cord steel - Google Patents
Production method capable of controlling titanium inclusions of thin-size high-end tire cord steel Download PDFInfo
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- CN105132610A CN105132610A CN201510531108.8A CN201510531108A CN105132610A CN 105132610 A CN105132610 A CN 105132610A CN 201510531108 A CN201510531108 A CN 201510531108A CN 105132610 A CN105132610 A CN 105132610A
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Abstract
The invention provides a production method capable of controlling titanium inclusions of thin-size high-end tire cord steel. The production method comprises the steps of molten iron desulphurization, smelting with a converter, refining, square billet heating, hot continuous rolling, cooling and coiling; the content of Ti, by weight percentage, in blast-furnace molten iron is selected to be smaller than or equal to 0.05%; a magnesium-powder spraying desulphurization process is adopted, the content of S, by weight percentage, in molten iron output from a station is controlled to be smaller than or equal to 0.005%, and desulfurized slag in a tank is cleaned up; in smelting with the converter, top-bottom blowing is adopted, a carbon-content raising and post blowing process is adopted at the terminal point, and at the terminal point of the converter, the content of C is controlled to be 0.10-0.30%, and the tapping temperature is controlled to be 1640-1660 DEG C; in refining, argon is blown all the way, CaC2 and special silicon are added for slag melting to form white slag, and then FeMn alloy is added for ingredient adjustment; the temperature of a soaking zone is 1050-1150 DEG C, the head and tail temperature difference is smaller than 50%, and the heating duration is 240-260 min; in hot continuous rolling, the initial rolling temperature is 1030-1070 DEG C, and the temperature at a finish rolling inlet is 870-900 DEG C; the temperature of an inlet of a reducing and sizing mill is 905-925 DEG C; and the spin temperature is 910-925 DEG C, and the spinning rate is 85-90 m/s. According to tire cord steel cords, with the diameter being 5.5 mm, produced through the production method, the Ti inclusion penalty value is obviously lowered, and the average value is smaller than 5.
Description
Technical field
The invention belongs to the production technical field of cord steel, specifically refer to a kind of production method controlling the high-end cord steel titanium of thin specification and be mingled with.
Background technology
Cord steel is the high carbon steel that a class high strength has special purpose, there is raising tire intensity, the effect of toughness and fatigue performance, it produces tyres for passenger cars, light lorry-tyre, heavy type truck tyre, the raw material of heavy equipment tire and plane tyre and other rubber item framework material, along with automotive light weight technology and from the security of raising car, the intensity rank of tyres for passenger cars wire of steel wire tire cord is improving constantly, good drawing property is very crucial for the production of steel cord, thus its requirement be mingled with titanium indeformable in steel is also more harsh, in order to control the harm of titanium inclusion in cord steel to wire rod drawing property, each steel mill implements harsh steel-making and refinery practice measure, as much as possible the impurity element in molten steel and N are removed to limit content.Therefore, find a kind of economical smelting and rolling technology method to control titanium inclusion in cord steel, wire quality is improved to situ production there is good directive significance, improve the profitability of product.
Before the present invention, application number is the Chinese patent of 201310202808.3, discloses a kind of method and the cord steel production method that control content of titanium in high-carbon steel.The method of described control content of titanium in high-carbon steel comprises: by the molten steel tapping after converter smelting in ladle, then external refining is carried out, in molten steel, add deoxygenated alloy when described tapping incomplete deoxidation treatment is carried out to molten steel, add synthetic slag, to control the oxygen activity of molten steel for 50 × 10 by weight percentage simultaneously
-4% ~ 100 × 10
-4%, and control the TiO in ladle top slag
2by weight percentage≤5%, wherein, the composition of described synthetic slag is by weight by the CaO of 40 ~ 55 parts, the SiO of 30 ~ 45 parts
2, the CaF of 10 ~ 25 parts
2the Al of ,≤3 part
2o
3and the TiO of≤2 parts
2composition, and in described synthetic slag, the weight ratio of calcium oxide and silicon-dioxide is 1.0 ~ 1.4.Its shortcoming one is tight to blast-melted middle titanium content requirement, is unfavorable for that extensive batch organizes production; Two is containing CaF in this covering slag
2, the erosion of centering water-coating port can be increased the weight of, simultaneously also can discharge some fluorochemicals and the pollution of environment that brings.Application number is the Chinese patent of 201310281262.5, discloses a kind ofly to control titanium in hypereutectoid Wire Rod Steel for Curtain String Purpose and be mingled with heating process before the rolling of size.Its technical scheme is: hypereutectoid cord steel continuously cast bloom is heated to 1150 ~ 1250 DEG C in heater for rolling steel, heat-up time is 2 ~ 6h, titanium in this process in strand is mingled with (TiN or Ti (C, N)) decompose (i.e. solid solution), littlely be mingled with disappearance, the size that large-size titanium is mingled with diminishes; Again the hypereutectoid cord steel strand of heat to be cooled by water smoke or aerosol is cooled to the normal start rolling temperature of hypereutectoid cord steel; Then high-speed wire mill rolling is entered.Present invention achieves the Dispersed precipitate that in the hypereutectoid Wire Rod Steel for Curtain String Purpose to superstrength, titanium is mingled with, the quantity that titanium in strand is mingled with and size are effectively controlled.Its shortcoming one is high to steel billet requirement, and Ti content requirement is tight; Its shortcoming two is that Heating temperature is high, and the time, cost was high up to 6h, reduced product competitiveness.
Summary of the invention
The invention provides a kind of production method controlling the high-end cord steel titanium of thin specification and be mingled with, the method is the quantity and size thereof that control Ti is mingled with when making steel, later stage by suitable heating process, thus reaches and controls titanium and be mixed in standard range, point penalty value < 5.
To achieve these goals, the production method that the high-end cord steel titanium of the thin specification of control of the present invention is mingled with, comprise the step of desulfurizing iron, converter smelting, refining, square billet heating, hot continuous rolling, cooling, collection volume, its special character is:
Described desulfurizing iron, selects blast-melted weight percent content Ti≤0.05%, adopts spray magnesium powder sulfur removal technology, and control departures molten iron sulphur weight percent content S≤0.005%, in tank, desulfurization slag is taken off totally;
During described converter smelting, adopt top-bottom blowing, terminal employing is high draws technique of re-blowing, and it is 0.10 ~ 0.30% that converter terminal C controls weight percent content, tapping temperature 1640 ~ 1660 DEG C; Slag-stopping tapping, ladle slag layer thickness≤70mm; Preferably, during described converter smelting, adopt the outer Alloying Treatment of stove, add ferro-silico-manganese, silicon carbide and carburelant with steel stream, C, Si, Mn control by the lower limit of internal control scope; Ton steel 4.5 ~ 5.5kg lime, 0.75 ~ 0.85kg fluorite, add with steel stream in tapping process and make new slag; Argon station argon pressure 0.5 ~ 0.6MPa, argon flow amount 7 ~ 10Nm3/min, thermometric, gets steel, slag specimen, Argon 2 ~ 5min;
During described refining, omnidistance Argon, adds CaC
2, special silication slag, form white slag, then add FeMn alloy and carry out composition adjustment; Adopt CaO-SiO
2-Al
2o
3slag system, basicity between 1.8 ~ 2.5, Al
2o
3control at < 15%; Winch to VD stove and carry out vacuum-treat, below 67MPa keeps 8 ~ 15min, adds quartz sand after terminating, and reduces basicity to 1.0 ~ 1.1, then soft blow argon 20 ~ 30min;
Square billet heating time, process control needs soaking zone temperature is 1050 ~ 1150 DEG C, and head and tail temperature difference is less than 50 DEG C, heat-up time 240 ~ 260min; During described hot continuous rolling, start rolling temperature is 1030 ~ 1070 DEG C, and entry temperature at finishing is 870 ~ 900 DEG C; Reducing sizing mill temperature in is 905 ~ 925 DEG C; Laying temperature is 910 ~ 925 DEG C, spinning rate 85 ~ 90m/s; Preferably, during described cooling, Stelmor controlled cooling line roller table speed 55 ~ 74m/s; Control 3,6,7,8# blower fan open amount is 85% of nominal air delivery, 9,10# blower fan open amount is 80% of nominal air delivery, all the other 1,2,4,5# blower fan open amount is 100% of nominal air delivery; Insulation cover is opened entirely.
After testing: produce according to the method described above
cord steel wire rod Ti is mingled with point penalty value to be reduced significantly, mean value < 5.Compared with prior art, present method no longer requires so strict to molten iron component, be beneficial to organization of production, and avoid the single method that in the past can only be controlled by steel-making means, reduce and sentence risk that is useless or degradation, add lumber recovery, strengthen the competitive power of product.
Embodiment
Control to the present invention the production method that the high-end cord steel titanium of thin specification is mingled with below in conjunction with specific embodiment to be described in further detail.
Embodiment 1
Control the production method that the high-end cord steel titanium of thin specification is mingled with, comprise the step of desulfurizing iron, converter smelting, refining, square billet heating, hot continuous rolling, cooling, collection volume, wherein:
Controlling blast-melted Ti weight percentage is 0.05%, desulfurizing iron, adopts spray magnesium powder sulfur removal technology, and controlling departures molten iron sulphur weight percentage is 0.004%, and in tank, desulfurization slag will be taken off totally.Converter adopts top-bottom blowing, and terminal employing is high draws technique of re-blowing, converter terminal C weight percentage control objectives 0.10%, tapping temperature 1660 DEG C; Slag-stopping tapping, ladle slag layer thickness 41mm; Adopt the outer alloying of stove, during tapping about 1/4, add ferro-silico-manganese, silicon carbide and carburelant with steel stream; Molten steel go out to 3/4 time, alloy must all add, and C, Si, Mn control by the lower limit of internal control scope; Add with steel stream in ton steel 4.8kg lime, 0.77kg fluorite tapping process and make new slag; Argon station argon pressure 0.5MPa, flow 8Nm
3/ min, thermometric, gets steel, slag specimen, after Argon 3min, rises and winches to LF stove; Omnidistance Argon, adds CaC
2, special silication slag, form white slag, then add FeMn alloy and carry out composition adjustment; Adopt CaO-SiO
2-Al
2o
3slag system, basicity between 1.83, Al
2o
3control 13%.Winch to VD stove and carry out vacuum-treat, below 67MPa keeps 10min, adds quartz sand after terminating, and reduces basicity to 1.0, then soft blow argon 28min, and continuous casting becomes 160*160mm
2square billet;
Rolling
steel rolling process: heating steel billet process control needs soaking zone temperature: 1050 DEG C, head and tail temperature difference is less than 50 DEG C, heat-up time 260min, start rolling temperature: 1030 DEG C, entry temperature at finishing: 873 DEG C.Reducing sizing mill temperature in: 908 DEG C.Laying temperature: 910 DEG C, spinning rate 90m/s.Stelmor controlled cooling line roller table speed 74m/s; Control 3,6,7,8# blower fan open amount is 85% of nominal air delivery, 9,10# blower fan open amount is 80% of nominal air delivery, all the other 1,2,4,5# blower fan open amount is 100% of nominal air delivery; Insulation cover is opened entirely.
Produce according to this implementation method method
cord steel wire rod Ti is mingled with point penalty value to be reduced significantly, mean value 4.5.
Embodiment 2
Control the production method that the high-end cord steel titanium of thin specification is mingled with, comprise the step of desulfurizing iron, converter smelting, refining, square billet heating, hot continuous rolling, cooling, collection volume, wherein:
Controlling blast-melted Ti weight percentage is 0.033%, desulfurizing iron, adopts spray magnesium powder sulfur removal technology, and controlling departures molten iron sulphur weight percentage is 0.001%, and in tank, desulfurization slag will be taken off totally.Converter adopts top-bottom blowing, and terminal employing is high draws technique of re-blowing, converter terminal C weight percentage control objectives 0.18%, tapping temperature 1651 DEG C; Slag-stopping tapping, ladle slag layer thickness 62mm; Adopt the outer alloying of stove, during tapping about 1/4, add ferro-silico-manganese, silicon carbide and carburelant with steel stream; Molten steel go out to 3/4 time, alloy must all add, and C, Si, Mn control by the lower limit of internal control scope; Add with steel stream in ton steel 5.3kg lime, 0.82kg fluorite tapping process and make new slag; Argon station argon pressure 0.6MPa, flow 10Nm
3/ min, thermometric, gets steel, slag specimen, after Argon 3min, rises and winches to LF stove.Omnidistance Argon, adds CaC
2, special silication slag, form white slag, then add FeMn alloy and carry out composition adjustment; Adopt CaO-SiO
2-Al
2o
3slag system, basicity between 2.2, Al
2o
3control 10%.Winch to VD stove and carry out vacuum-treat, below 67MPa keeps 10min, adds quartz sand after terminating, and reduces basicity to 1.0, then soft blow argon 25min, and continuous casting becomes 160*160mm square billet.
Rolling
steel rolling process: heating steel billet process control needs soaking zone temperature: 1150 DEG C, head and tail temperature difference is less than 50 DEG C, heat-up time 240min, start rolling temperature: 1068 DEG C, entry temperature at finishing: 899 DEG C.Reducing sizing mill temperature in: 923 DEG C.Laying temperature: 924 DEG C, spinning rate 90m/s.Stelmor controlled cooling line roller table speed 55m/s.Control 3,6,7,8# blower fan open amount is 85% of nominal air delivery, 9,10# blower fan open amount is 80% of nominal air delivery, all the other 1,2,4,5# blower fan open amount is 100% of nominal air delivery.Insulation cover is opened entirely.
Produce according to the method described above after testing
cord steel wire rod Ti is mingled with point penalty value to be reduced significantly, mean value 3.4.
Embodiment 3
Control the production method that the high-end cord steel titanium of thin specification is mingled with, comprise the step of desulfurizing iron, converter smelting, refining, square billet heating, hot continuous rolling, cooling, collection volume, wherein:
Controlling blast-melted Ti weight percentage is 0.046%, desulfurizing iron, adopts spray magnesium powder sulfur removal technology, and controlling departures molten iron sulphur weight percentage is 0.0047%, and in tank, desulfurization slag will be taken off totally.Converter adopts top-bottom blowing, and terminal employing is high draws technique of re-blowing, converter terminal C control objectives 0.23%, tapping temperature 1648 DEG C; Slag-stopping tapping, ladle slag layer thickness 40mm; Adopt the outer alloying of stove, during tapping about 1/4, add ferro-silico-manganese, silicon carbide and carburelant with steel stream; Molten steel go out to 3/4 time, alloy must all add, and C, Si, Mn control by the lower limit of internal control scope; Add with steel stream in ton steel 4.5kg lime, 0.85kg fluorite tapping process and make new slag; Argon station argon pressure 0.6MPa, flow 7Nm
3/ min, thermometric, gets steel, slag specimen, after Argon 3min, rises and winches to LF stove.Omnidistance Argon, adds CaC
2, special silication slag, form white slag, then add FeMn alloy and carry out composition adjustment; Adopt CaO-SiO
2-Al
2o
3slag system, basicity between 2.23, Al
2o
3control 12.3%.Winch to VD stove and carry out vacuum-treat, below 67MPa keeps 11min, adds quartz sand after terminating, and reduces basicity to 11.1, then soft blow argon 22min, and continuous casting becomes 160*160mm
2square billet.
Rolling
steel rolling process: heating steel billet process control needs soaking zone temperature: 1100 DEG C, head and tail temperature difference is less than 50 DEG C, heat-up time 250min, start rolling temperature: 1054 DEG C, entry temperature at finishing: 887 DEG C.Reducing sizing mill temperature in: 913 DEG C.Laying temperature: 914 DEG C, spinning rate 87m/s.Stelmor controlled cooling line roller table speed 67m/s.Control 3,6,7,8# blower fan open amount is 85% of nominal air delivery, 9,10# blower fan open amount is 80% of nominal air delivery, all the other 1,2,4,5# blower fan open amount is 100% of nominal air delivery, insulation cover is opened entirely.
After testing: produce according to the method described above
cord steel wire rod Ti is mingled with point penalty value to be reduced significantly, mean value 3.6.
Embodiment 4
Control the production method that the high-end cord steel titanium of thin specification is mingled with, comprise the step of desulfurizing iron, converter smelting, refining, square billet heating, hot continuous rolling, cooling, collection volume, wherein:
Controlling blast-melted Ti weight percentage is 0.05%, desulfurizing iron, adopts spray magnesium powder sulfur removal technology, and controlling departures molten iron sulphur weight percentage is 0.005%, and in tank, desulfurization slag will be taken off totally.Converter adopts top-bottom blowing, and terminal employing is high draws technique of re-blowing, and converter terminal C weight percentage control objectives is 0.27%, tapping temperature 1643 DEG C; Slag-stopping tapping, ladle slag layer thickness 43mm; Adopt the outer alloying of stove, during tapping about 1/4, add ferro-silico-manganese, silicon carbide and carburelant with steel stream; Molten steel go out to 3/4 time, alloy must all add, and C, Si, Mn control by the lower limit of internal control scope; Add with steel stream in ton steel 4.71kg lime, 0.799kg fluorite tapping process and make new slag; Argon station argon pressure 0.5MPa, flow 10Nm3/min, thermometric, gets steel, slag specimen, after Argon 3min, rises and winches to LF stove.Omnidistance Argon, adds CaC
2, special silication slag, form white slag, then add FeMn alloy and carry out composition adjustment; Adopt CaO-SiO
2-Al
2o
3slag system, basicity between 1.83, Al
2o
3control 11%.Winch to VD stove and carry out vacuum-treat, below 67MPa keeps 12min, adds quartz sand after terminating, and reduces basicity to 1.1, then soft blow argon 20min, and continuous casting becomes 160*160mm
2square billet.
Rolling
steel rolling process: heating steel billet process control needs soaking zone temperature: 1081 DEG C, head and tail temperature difference is less than 50 DEG C, heat-up time 258min, start rolling temperature: 1064 DEG C, entry temperature at finishing: 877 DEG C.Reducing sizing mill temperature in: 909 DEG C.Laying temperature: 911 DEG C, spinning rate 90m/s.Stelmor controlled cooling line roller table speed 74m/s.Control 3,6,7,8# blower fan open amount is 85% of nominal air delivery, 9,10# blower fan open amount is 80% of nominal air delivery, all the other 1,2,4,5# blower fan open amount is 100% of nominal air delivery, insulation cover is opened entirely.
After testing, produce according to the method described above
cord steel wire rod Ti is mingled with point penalty value to be reduced significantly, mean value 2.7.
Claims (3)
1. control the production method that the high-end cord steel titanium of thin specification is mingled with, comprise the step of desulfurizing iron, converter smelting, refining, square billet heating, hot continuous rolling, cooling, collection volume, it is characterized in that:
Described desulfurizing iron, selects blast-melted weight percent content Ti≤0.05%, adopts spray magnesium powder sulfur removal technology, and control departures molten iron sulphur weight percent content S≤0.005%, in tank, desulfurization slag is taken off totally;
During described converter smelting, adopt top-bottom blowing, terminal employing is high draws technique of re-blowing, and it is 0.10 ~ 0.30% that converter terminal C controls weight percent content, and tapping temperature is 1640 ~ 1660 DEG C; Slag-stopping tapping, ladle slag layer thickness≤70mm;
During described refining, omnidistance Argon, adds CaC
2, special silication slag, form white slag, then add FeMn alloy and carry out composition adjustment; Adopt CaO-SiO
2-Al
2o
3slag system, basicity between 1.8 ~ 2.5, Al
2o
3control at < 15%; Winch to VD stove and carry out vacuum-treat, below 67MPa keeps 8 ~ 15min, adds quartz sand after terminating, and reduces basicity to 1.0 ~ 1.1, then soft blow argon 20 ~ 30min;
Square billet heating time, process control needs soaking zone temperature is 1050 ~ 1150 DEG C, and head and tail temperature difference is less than 50 DEG C, heat-up time 240 ~ 260min; During described hot continuous rolling, start rolling temperature is 1030 ~ 1070 DEG C, and entry temperature at finishing is 870 ~ 900 DEG C; Reducing sizing mill temperature in is 905 ~ 925 DEG C; Laying temperature is 910 ~ 925 DEG C, and spinning rate is 85 ~ 90m/s.
2. the production method that is mingled with of the high-end cord steel titanium of the thin specification of control according to claim 1, it is characterized in that: during described converter smelting, adopt the outer Alloying Treatment of stove, add ferro-silico-manganese, silicon carbide and carburelant with steel stream, C, Si, Mn control by the lower limit of internal control scope; By ton steel 4.5 ~ 5.5kg lime, 0.75 ~ 0.85kg fluorite, add with steel stream in tapping process and make new slag; Argon station argon pressure 0.5 ~ 0.6MPa, argon flow amount is 7 ~ 10Nm
3/ min, thermometric, gets steel, slag specimen, Argon 2 ~ 5min.
3. the production method that is mingled with of the high-end cord steel titanium of the thin specification of control according to claim 1 and 2, it is characterized in that: during described cooling, Stelmor controlled cooling line roller table speed is 55 ~ 74m/s, control 3,6,7,8# blower fan open amount is 85% of nominal air delivery, 9,10# blower fan open amount is 80% of nominal air delivery, all the other 1,2,4,5# blower fan open amount is 100% of nominal air delivery, insulation cover is opened entirely.
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| CN201510531108.8A CN105132610B (en) | 2015-08-26 | 2015-08-26 | The production method for controlling the high-end cord steel titanium of thin specification to be mingled with |
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|---|---|---|---|
| CN201510531108.8A CN105132610B (en) | 2015-08-26 | 2015-08-26 | The production method for controlling the high-end cord steel titanium of thin specification to be mingled with |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106191652A (en) * | 2016-08-10 | 2016-12-07 | 武汉钢铁股份有限公司 | A kind of smelting process reducing spring steel clip foreign material |
| CN110328229A (en) * | 2019-04-26 | 2019-10-15 | 武汉钢铁有限公司 | 70 grades of Wire Rod Steel for Curtain String Purpose iron scale method for controlling thickness suitable for mechanical descaling |
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| CN101831521A (en) * | 2010-05-25 | 2010-09-15 | 安阳钢铁股份有限公司 | Method for producing cord steel |
| CN102534094A (en) * | 2012-01-01 | 2012-07-04 | 首钢总公司 | Method for producing tire cord steel wire by converter billet continuous casting process |
| CN103243256A (en) * | 2013-05-28 | 2013-08-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling titanium content in high-carbon steel and production method 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 |
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- 2015-08-26 CN CN201510531108.8A patent/CN105132610B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101831521A (en) * | 2010-05-25 | 2010-09-15 | 安阳钢铁股份有限公司 | Method for producing cord steel |
| CN102534094A (en) * | 2012-01-01 | 2012-07-04 | 首钢总公司 | Method for producing tire cord steel wire by converter billet continuous casting process |
| CN103243256A (en) * | 2013-05-28 | 2013-08-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling titanium content in high-carbon steel and production method 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106191652A (en) * | 2016-08-10 | 2016-12-07 | 武汉钢铁股份有限公司 | A kind of smelting process reducing spring steel clip foreign material |
| CN110328229A (en) * | 2019-04-26 | 2019-10-15 | 武汉钢铁有限公司 | 70 grades of Wire Rod Steel for Curtain String Purpose iron scale method for controlling thickness suitable for mechanical descaling |
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|---|---|
| CN105132610B (en) | 2017-11-21 |
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Effective date of registration: 20170801 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Applicant after: Wuhan iron and Steel Company Limited Address before: 430000, A, building 999, friendship road, Wuchang District, Hubei, Wuhan, 15 Applicant before: Wuhan Iron & Steel (Group) Corp. |
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