CN105420441A - Smelting method for hyperfine tire cord steel - Google Patents
Smelting method for hyperfine tire cord steel Download PDFInfo
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- CN105420441A CN105420441A CN201410480151.1A CN201410480151A CN105420441A CN 105420441 A CN105420441 A CN 105420441A CN 201410480151 A CN201410480151 A CN 201410480151A CN 105420441 A CN105420441 A CN 105420441A
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Abstract
A smelting method for hyperfine tire cord steel includes the steps that tapping at high carbon is conducted behind a converter, the content of C at the end point of smelting is 0.50%-0.65%, the oxygen activity of molten steel is smaller than or equal to 0.012%, and the content of nitrogen is smaller than or equal to 0.0020%; 3.8-4.1 kg of wollastonite is added in per ton of steel behind the converter; deoxygenation is conducted behind the converter by adopting ferrosilicon and mid-carbon ferromanganese, wherein the content of Ti and the content of Al in the ferrosilicon and the mid-carbon ferromanganese are not larger than 0.02%; in ladle furnace (LF) refining, the argon flow is smaller than or equal to 400 NL/min, the content of N in the steel after refining is smaller than or equal to 0.0035%, the alkalinity of top slag is controlled to be 5.5-7.0, the content of Al2O3 in the top slag is smaller than or equal to 4%, and the content of MgO in the top slag is smaller than or equal to 8%; weak argon blowing stirring after refining is conducted, and the argon flow is 50-100 NL/min; and protective casting is adopted for continuous casting, the content of N in molten steel in a tundish is controlled to be smaller than or equal to 0.0040%, and the depth of the liquid level of the molten steel in the tank exchange process of the tundish is not smaller than 700 mm. According to the smelting method, chemical components of oxide inclusions in continuously cast billets can be controlled, wherein the content of CaO/SiO2 is 0.2%-1.0%, and the content of Al2O3 is not larger than 20%, so that the qualified 70-level hyperfine tire cord steel is produced.
Description
Technical field
The invention belongs to process for making technical field, be specifically related to the smelting process of a kind of hyperfine cord 70 grades of wire rod steels.
Background technology
It is the most carefully 0.15mm (hyperfine) that 70 grades of Wire Rod Steel for Curtain String Purposes are processed into steel cord, its chemical composition mass percentage content is: C0.70 ~ 0.74%, Si0.15 ~ 0.30%, Mn0.46 ~ 0.60%, P < 0.025%, Cr < 0.08%, Ni < 0.10%, Cu < 0.08%, N < 0.005%, Sn < 0.01%, As < 0.03, (Ni+Cr+Cu) < 0.15%, (P+S) < 0.03%, Al < 0.005.The principal element affecting wire rod quality is the residual element content such as inclusion size and nitrogen in wire rod, therefore very strict to the requirement of inclusion size in wire rod and residual element content, along with the raising of the Production requirement of hyperfine cord, make its specification of quality also stricter.
Summary of the invention
The invention provides a kind of smelting process of 70 grades of hyperfine Wire Rod Steel for Curtain String Purposes, its object is intended to by converter tapping steel with high carbon, LF stove low alkalinity slag system, optimized alloy grade and Argon system, control oxygen activity and inclusion in steel, thus produce 70 grades of qualified hyperfine cord steel.
For this reason, the technical solution that the present invention takes is:
A smelting process for hyperfine cord steel, is characterized in that, the hyperfine cord smelting process of 70 grades of wire rod steels is:
1, tapping steel with high carbon is adopted after Converter, smelting endpoint carbon content is 0.50% ~ 0.65%, control molten steel oxygen activity and be not more than 0.012%, by controlling converter smelting endpoint oxygen activity, to be no more than 0.012% be cord steel refinement and deoxidation, control steel inclusion size and quantity lays the foundation; By tapping steel with high carbon, after minimizing Converter, the add-on of carburelant, prevents molten steel nitrogen pick-up after Converter excessive, controls nitrogen content in liquid steel and is not more than 0.0020%, for cord steel finished product nitrogen content lays the foundation.
2, after Converter, add the wollastonite of 3.8 ~ 4.1kg/ ton steel, utilize the feature that converter tapping molten steel temperature is higher, accelerate the fusing of refining slag, extend steel slag action time, lay the foundation for reducing inclusion size and quantity in cord steel.
3, ferrosilicon and mid-carbon fe-mn is adopted to carry out deoxidation, alloying after Converter, Ti and the Al content of ferrosilicon and mid-carbon fe-mn is all not more than 0.02%, by controlling residual element content in iron alloy, improving cord steel steel cleanliness factor, laying the foundation for oxide inclusion and titanium in control steel are mingled with; Meanwhile, by the use of special ferrosilicon and mid-carbon fe-mn, it also avoid the molten steel nitrogen pick-up problem that alloys such as using manganese metal brings.After Converter and refining process, prohibit the use the strong reductor deoxidation of aluminium, titanium, prevent molten steel oxygen activity too low, reduce the deformability of oxide inclusion in cord steel; Also avoid the increase of aluminium titanium content in steel simultaneously, cause titanium in steel to be mingled with size and quantity increase.
4, in LF refining composition adjustment process, argon flow amount is not more than 400NL/min, prevents larger argon flow amount from causing molten steel to expose; Increase nitrogen in steel content, after control LF refining, nitrogen in steel content is not more than 0.0035%.
5, LF refining process top basicity of slag controls 5.5 ~ 7.0, Al in the slag of top
2o
3≤ 4%, MgO≤8%, controls oxide components in steel by top slag ingredient, makes it to have good deformability; After refining, in cord steel, oxide inclusion composition by weight percent meets:
15％≤Al
2O
3≤25％
55％≤(Al
2O
3+CaO)≤80％
(Al
2O
3+CaO+SiO
2)≥85％
TiO
2≤2％。
6, carry out soft argon blowing stirring after LF refining, whipping process argon flow amount controls at 50 ~ 100NL/min, utilizes the Argon Bubble dross inclusion adsorption that Argon process is tiny, makes it to float to discharge molten steel, improves steel cleanliness factor.
7, casting process takes molding casting, prevents molten steel nitrogen pick-up, controls tundish molten steel nitrogen content and is not more than 0.0040%; Change tank process at continuous casting production, molten steel level is not less than 700mm, to prevent the too low molten steel slag caused of liquid level.
Beneficial effect of the present invention is:
Oxide inclusion chemical Composition Control in continuously cast bloom can exist by the present invention: CaO/SiO2 controls at 0.2 ~ 1.0, Al
2o
3content, in 20% region, produces 70 grades of qualified hyperfine cord steel.Its oxide inclusion has good deformability, forms strip inclusion, reduce the harm of inclusion in machined steel cord process at follow-up continuous rolling process.
Embodiment
Embodiment 1:
1, adopt tapping steel with high carbon after Converter, smelting endpoint carbon content 0.55%, controlling molten steel oxygen activity is 0.010%, and nitrogen content 0.0018%, for cord steel finished product nitrogen content lays the foundation.
2, after Converter, add the wollastonite of 4kg/ ton steel, utilize the feature that converter tapping molten steel temperature is higher, accelerate the fusing of refining slag.
3, ferrosilicon and mid-carbon fe-mn is adopted to carry out deoxidation, alloying after Converter, Ti and the Al content of ferrosilicon and mid-carbon fe-mn is respectively 0.015% and 0.018%, by controlling residual element content in iron alloy, improve cord steel steel cleanliness factor, lay the foundation for oxide inclusion and titanium in control steel are mingled with.
4, in LF refining composition adjustment process, argon flow amount controls at 360NL/min, and after control LF refining, nitrogen in steel content is 0.0033%.
5, LF refining process top basicity of slag controls 6.0, Al in the slag of top
2o
3be 3.8%, MgO is 7.9%, control oxide components in steel by top slag ingredient, make it that there is good deformability; After refining, in cord steel, oxide inclusion composition by weight percent is: Al
2o
3be 22%; (Al
2o
3+ CaO) 79%; (Al
2o
3+ CaO+SiO
2) be 86%; TiO
2be 1.32%.
6, carry out soft argon blowing stirring after LF refining, whipping process argon flow amount controls at 76NL/min, utilizes the Argon Bubble dross inclusion adsorption that Argon process is tiny, makes it to float to discharge molten steel, improves steel cleanliness factor.
7, casting process takes molding casting, controls tundish molten steel nitrogen content 0.0030%.Change tank process at continuous casting production, molten steel level controls at 730mm, to prevent the too low molten steel slag caused of liquid level.
Embodiment 2:
1, adopt tapping steel with high carbon after Converter, smelting endpoint carbon content 0.63%, controlling molten steel oxygen activity is 0.011%, and nitrogen content 0.0015%, for cord steel finished product nitrogen content lays the foundation.
2, after Converter, add the wollastonite of 3.9kg/ ton steel, utilize the feature that converter tapping molten steel temperature is higher, accelerate the fusing of refining slag.
3, ferrosilicon and mid-carbon fe-mn is adopted to carry out deoxidation, alloying after Converter, Ti and the Al content of ferrosilicon and mid-carbon fe-mn is respectively 0.018% and 0.017%, by controlling residual element content in iron alloy, improve cord steel steel cleanliness factor, lay the foundation for oxide inclusion and titanium in control steel are mingled with.
4, in LF refining composition adjustment process, argon flow amount controls at 385NL/min, and after control LF refining, nitrogen in steel content is 0.0030%.
5, LF refining process top basicity of slag controls 6.7, Al in the slag of top
2o
3be 3.6%, MgO is 7.7%, control oxide components in steel by top slag ingredient, make it that there is good deformability; After refining, in cord steel, oxide inclusion composition by weight percent is: Al
2o
3be 20%; (Al
2o
3+ CaO) 61%; (Al
2o
3+ CaO+SiO
2) be 87%; TiO
2be 1.79%.
6, carry out soft argon blowing stirring after LF refining, whipping process argon flow amount controls at 88NL/min, utilizes the Argon Bubble dross inclusion adsorption that Argon process is tiny, makes it to float to discharge molten steel, improves steel cleanliness factor.
7, casting process takes molding casting, controls tundish molten steel nitrogen content 0.0033%.Change tank process at continuous casting production, molten steel level controls at 750mm, to prevent the too low molten steel slag caused of liquid level.
Claims (1)
1. a smelting process for hyperfine cord steel, is characterized in that, the hyperfine cord smelting process of 70 grades of wire rod steels is:
(1) adopt tapping steel with high carbon after Converter, smelting endpoint carbon content is 0.50% ~ 0.65%, and control molten steel oxygen activity and be not more than 0.012%, nitrogen content in liquid steel is not more than 0.0020%;
(2) after Converter, add the wollastonite of 3.8 ~ 4.1kg/ ton steel;
(3) adopt ferrosilicon and mid-carbon fe-mn to carry out deoxidation, alloying after Converter, Ti and the Al content of ferrosilicon and mid-carbon fe-mn is all not more than 0.02%; After Converter and refining process, prohibit the use the strong reductor deoxidation of aluminium, titanium;
(4) in LF refining composition adjustment process, argon flow amount is not more than 400NL/min, and after control LF refining, nitrogen in steel content is not more than 0.0035%;
(5) LF refining process top basicity of slag controls 5.5 ~ 7.0, Al in the slag of top
2o
3≤ 4%, MgO≤8%, after refining, in cord steel, oxide inclusion composition by weight percent meets:
15％≤Al
2O
3≤25％
55％≤(Al
2O
3+CaO)≤80％
(Al
2O
3+CaO+SiO
2)≥85％
TiO
2≤2％；
(6) carry out soft argon blowing stirring after LF refining, whipping process argon flow amount controls at 50 ~ 100NL/min;
(7) casting process takes molding casting, controls tundish molten steel nitrogen content and is not more than 0.0040%; Change tank process at continuous casting production, molten steel level is not less than 700mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410480151.1A CN105420441A (en) | 2014-09-19 | 2014-09-19 | Smelting method for hyperfine tire cord steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410480151.1A CN105420441A (en) | 2014-09-19 | 2014-09-19 | Smelting method for hyperfine tire cord steel |
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|---|---|
| CN105420441A true CN105420441A (en) | 2016-03-23 |
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|---|---|---|---|
| CN201410480151.1A Pending CN105420441A (en) | 2014-09-19 | 2014-09-19 | Smelting method for hyperfine tire cord steel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106636534A (en) * | 2016-11-25 | 2017-05-10 | 北京首钢股份有限公司 | Method for controlling ratio of calcium to aluminum of auto sheet ladle top slag to be 1.2-1.8 |
| CN107794332A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | A kind of smelting process of 90 grade super strength cord steel |
| CN108004374A (en) * | 2017-11-27 | 2018-05-08 | 邢台钢铁有限责任公司 | A kind of method realized oxide in cord steel and be mingled with low Young's modulus |
| CN114058932A (en) * | 2021-11-19 | 2022-02-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Heavy rail steel and method for controlling silicate inclusions in production of heavy rail steel |
| CN114774794A (en) * | 2022-05-07 | 2022-07-22 | 张家港荣盛特钢有限公司 | Cord steel and method for modifying inclusion of cord steel |
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| CN101353764A (en) * | 2007-07-27 | 2009-01-28 | 首钢总公司 | Microalloying high strength wire rod |
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2014
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107794332A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | A kind of smelting process of 90 grade super strength cord steel |
| CN106636534A (en) * | 2016-11-25 | 2017-05-10 | 北京首钢股份有限公司 | Method for controlling ratio of calcium to aluminum of auto sheet ladle top slag to be 1.2-1.8 |
| CN106636534B (en) * | 2016-11-25 | 2019-01-04 | 北京首钢股份有限公司 | The method for controlling Automobile Plate ladle top slag calcium aluminium ratio 1.2-1.8 |
| CN108004374A (en) * | 2017-11-27 | 2018-05-08 | 邢台钢铁有限责任公司 | A kind of method realized oxide in cord steel and be mingled with low Young's modulus |
| CN114058932A (en) * | 2021-11-19 | 2022-02-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Heavy rail steel and method for controlling silicate inclusions in production of heavy rail steel |
| CN114058932B (en) * | 2021-11-19 | 2023-02-21 | 攀钢集团攀枝花钢铁研究院有限公司 | Heavy rail steel and method for controlling silicate inclusions in production of heavy rail steel |
| CN114774794A (en) * | 2022-05-07 | 2022-07-22 | 张家港荣盛特钢有限公司 | Cord steel and method for modifying inclusion of cord steel |
| CN114774794B (en) * | 2022-05-07 | 2023-03-28 | 张家港荣盛特钢有限公司 | Cord steel and method for modifying inclusion of cord steel |
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