CN104911301A - Smelting process capable of increasing tire cord steel boron yield - Google Patents
Smelting process capable of increasing tire cord steel boron yield Download PDFInfo
- Publication number
- CN104911301A CN104911301A CN201510375066.3A CN201510375066A CN104911301A CN 104911301 A CN104911301 A CN 104911301A CN 201510375066 A CN201510375066 A CN 201510375066A CN 104911301 A CN104911301 A CN 104911301A
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- China
- Prior art keywords
- steel
- boron
- yield
- smelting process
- slag
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Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 60
- 239000010959 steel Substances 0.000 title claims abstract description 60
- 229910052796 boron Inorganic materials 0.000 title claims abstract description 48
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 238000003723 Smelting Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000008569 process Effects 0.000 title claims abstract description 18
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 38
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 25
- 239000001301 oxygen Substances 0.000 claims abstract description 25
- 229910052786 argon Inorganic materials 0.000 claims abstract description 19
- 230000000694 effects Effects 0.000 claims abstract description 16
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 11
- 238000007664 blowing Methods 0.000 claims abstract description 8
- 239000010703 silicon Substances 0.000 claims abstract description 8
- 238000007670 refining Methods 0.000 claims abstract description 7
- 238000009749 continuous casting Methods 0.000 claims abstract description 5
- 230000003647 oxidation Effects 0.000 claims abstract description 4
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 4
- 238000011084 recovery Methods 0.000 claims description 25
- 238000005516 engineering process Methods 0.000 claims description 16
- 239000002893 slag Substances 0.000 claims description 14
- 229920001296 polysiloxane Polymers 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 229910000914 Mn alloy Inorganic materials 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 239000011572 manganese Substances 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 229910000521 B alloy Inorganic materials 0.000 abstract description 5
- 238000005457 optimization Methods 0.000 abstract description 2
- 238000009628 steelmaking Methods 0.000 abstract description 2
- 238000005275 alloying Methods 0.000 abstract 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 1
- 230000002411 adverse Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 239000000047 product Substances 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a smelting process capable of increasing tire cord steel boron yield. The smelting process comprises the following steps: (1) electric furnace or converter oxygen blowing smelting; (2) argon station blowing; (3) LF refining; (4) RH vacuum processing; and (5) continuous casting, adopting a long nozzle and an immersed nozzle for protective pouring to prevent liquid steel from secondary oxidation. The smelting process is capable of effectively solving the problems of low boron yield and large boron component fluctuation of the traditional process, thoroughly eliminating the adverse impact of inappropriate boron alloying on steel product performance, and providing process technical support for tire cord steel quality optimization. Meanwhile, the smelting process does not need extra equipment and can be completed under the condition of the existing process equipment, and is safe and pollution-free. According to the smelting process, the various steps of steelmaking are comprehensively controlled, and the factors such as the carbon content and the silicon content of the tapped steel, the oxygen activity in the steel and the like are adjusted so that the boron alloying yield can be increased; consequently, the boron alloy yield can be above 80%, the production cost can be effectively reduced, and the component once hit rate and the yield can be increased.
Description
Technical field
The present invention relates to steelmaking technical field, specifically refer to a kind of smelting technology improving cord steel boron recovery rate.
Background technology
Cord steel is the support frame of automobile radial tire, has the effect improving tire intensity, toughness and fatigue performance, is the representative products of ultra clean steel and the significant product of wire quality level, is known as " wire rod superfine product ".
In recent years domestic automobile industry is flourish, effectively drives the demand of cord steel.Under the serious superfluous overall background of iron and steel production capacity, iron and steel enterprise attempts to be enhanced competitiveness by product up-gradation, directly causes only having several the fertile cord steel of enterprise in the past, faces fierce market competition.
Add the improvement that suitable boron is conducive to plasticity in cord steel, steel wire products enterprise commerical test shows, through boron micro-alloyed high-carbon steel wire rod, when pulling into metal products, process plastic is high, and is conducive to improving cord steel hardening capacity, thus widespread use.But excessive free boron can make material have brittle tendency, thus need to improve smelting process boron component hit rate, be reduced to a point fluctuation.
Boron chemical property is active, and easy and oxygen, nitrogen react and generates oxide compound and nitride, thus reduce effective boron content in steel.Cord steel is boron alloyed to be realized by adding ferro-boron, and ferro-boron expensive (about 2.4 ten thousand yuan/ton) and recovery rate is lower causes Boron contents fluctuation in steel comparatively large, affects the rate of steel products produced to steel ingots and production cost.Existing cord steel smelting technology boron recovery rate is low and unstable, causes Boron contents fluctuation in steel comparatively large, not only increases smelting cost, and affect cord steel lumber recovery and the finished product performance.
By cord steel quality in kind, mark is found, blue or green steel is by boron alloyed raising cord steel hardening capacity Be very effective, be worth using for reference, but boron recovery rate is low and ferro-boron is expensive (about 2.4 ten thousand yuan/ton), therefore carry out quality, reduction production cost, the raising market competitiveness that the research improving boron alloy recovery rate is conducive to stable cord steel product.
Summary of the invention
For overcoming above-mentioned the deficiencies in the prior art, the object of the invention is, by controlling key process parameter, a kind of smelting technology improving cord steel boron recovery rate to be provided, to make boron alloy recovery rate reach more than 80%.
For achieving the above object, the smelting technology of raising cord steel boron recovery rate provided by the invention, comprises following steps:
(1) electric furnace or Converter Oxigen Blowing are smelted: endpoint carbon content controls 0.71 ~ 0.75%, when going out molten steel 1/4, adds silicon, manganese alloy and carburelant with steel stream, and described C, Si, Mn content is pressed standard min and controlled;
(2) argon station blowing: the soft blow time is 6 ~ 8min, and argon pressure is 0.55 ± 0.05MPa, and argon flow amount is 8.5 ± 1.5Nm
3/ min;
(3) LF refining: adopt CaO-SiO
2-Al
2o
3slag system refining, basicity of slag target value controls 1.5 ~ 2.4, changes in slag process and adds appropriate special silicon, forms white slag, is controlled by silicone content 0.2 ~ 0.25%, and oxygen activity controls to carry out after 20 ~ 70ppm boron alloyed;
(4) RH vacuum-treat: below the 67Pa treatment time is 8 ~ 13min, RH stove target temperature leaving from station is 1565 ± 15 DEG C;
(5) continuous casting adopts long nozzle and submerged nozzle molding casting, prevents secondary oxidation of steel; Oxygen in energy medium: O
2>=99.5%, N
2≤ 100ppm; Argon gas: Ar>=99.98%.
Preferably, in described step (1), endpoint carbon content controls 0.73%; In described step (2), the soft blow time is 7min, and argon pressure is 0.55MPa, and argon flow amount is 8.5Nm
3/ min; In described step (3), basicity of slag target value is 2.4, and silicone content is 0.25%, and oxygen activity is 33ppm; In described step (4), below the 67Pa treatment time is 10min, RH stove target temperature leaving from station is 1568 DEG C.
The invention has the advantages that: the present invention is by the crucial controlling factor of adjustment smelting technology, the boron recovery rate of boron alloyed process is made to reach more than 80%, efficiently solve traditional technology boron recovery rate low, the problem that boron component fluctuation is larger, completely eliminate the boron alloyed improper disadvantageous effect to steel performance, support for cord steel quality optimization provides Technology.Meanwhile, the present invention, without the need to extras, can complete under existing tooling condition, and safety non-pollution.The present invention, Comprehensive Control makes steel each operation, by factors such as oxygen activities in adjustment tapping carbon content, silicone content and steel, improves boron alloyed recovery rate, make boron alloy recovery rate reach more than 80%, effectively reduce production cost, improve composition first-hit yield and lumber recovery.
Accompanying drawing explanation
Fig. 1 is oxygen activity and boron recovery rate relation curve in steel of the present invention.
Fig. 2 is silicone content and boron recovery rate relation curve in steel of the present invention.
Fig. 3 is silicone content and oxygen activity relation curve in steel of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Various embodiments of the present invention shown in figure and comparative example are all produced according to following smelting technology: electric furnace or converter → argon station → LF → RH → continuous casting.
Its concrete smelting technology step is as follows:
(1) electric furnace or Converter Oxigen Blowing are smelted, and endpoint carbon content controls 0.71 ~ 0.75%, when going out molten steel 1/4, adds silicon, manganese alloy and carburelant with steel stream, and C, Si, Mn content is pressed standard min and controlled;
(2) argon station blowing, soft blow 6 ~ 8min, argon pressure 0.55 ± 0.05MPa, argon flow amount 8.5 ± 1.5Nm
3/ min;
(3) LF refining, adopts CaO-SiO
2-Al
2o
3slag system refining, basicity of slag target value controls 1.5 ~ 2.4, changes in slag process and adds appropriate special silicon, forms white slag, is controlled by silicone content 0.2 ~ 0.25%, and oxygen activity controls to carry out after 20 ~ 70ppm boron alloyed;
(4) RH vacuum-treat, below the 67Pa treatment time: 8 ~ 13min, RH stove target temperature leaving from station: 1565 ± 15 DEG C;
(5) continuous casting adopts long nozzle and submerged nozzle molding casting, prevents secondary oxidation of steel.
Wherein embodiment 1 ~ 12 and comparative example smelting technology and boron recovery rate, in table 1.
Table 1 embodiment and comparative example smelting technology and boron recovery rate
Smelting technology mechanism of the present invention is as follows:
Carbon content: there is carbon and oxygen balance in steel, namely under certain temperature carbon concentration and oxygen concn inversely proportional.For reducing oxygen concn in steel, reducing boron alloy scaling loss, therefore endpoint carbon content of converter being controlled 0.71% ~ 0.75%.
Silicone content: the reaction of silicon and oxygen has precedence over the oxidizing reaction of boron, therefore suitably improves silicone content in steel, can effectively reduce oxygen activity in steel, thus the recovery rate of boron is raised.Therefore, before boron alloyed, in steel, silicone content controls 0.2 ~ 0.25%.
Oxygen activity: in steel, oxygen activity increase certainly will reduce the recovery rate of boron, therefore, for improving steel performance, improving boron recovery rate, should reduce oxygen activity in steel as far as possible under processing condition allow.Thus, before boron alloyed, oxygen activity controls at 20 ~ 70ppm.
Energy medium requires: boron not only reacts with oxygen, can also react generate BN with N, and thus higher purity guaranteed by smelting process oxygen blast or the gases used need of Argon.Thus energy medium requirement, oxygen: O
2>=99.5%, N
2≤ 100ppm; Argon gas: Ar>=99.98%.
Boron recovery rate, by controlling smelting process key factor, is brought up to more than 80% from 60%, Be very effective by the present invention.Therefore technical scheme of the present invention for lifting cord steel quality, reduce production cost and catch up with and surpass blue or green steel significant.
Claims (2)
1. improve a smelting technology for cord steel boron recovery rate, comprise following steps:
(1) electric furnace or Converter Oxigen Blowing are smelted: endpoint carbon content controls 0.71 ~ 0.75%, when going out molten steel 1/4, adds silicon, manganese alloy and carburelant with steel stream, and described C, Si, Mn content is pressed standard min and controlled;
(2) argon station blowing: the soft blow time is 6 ~ 8min, and argon pressure is 0.55 ± 0.05MPa, and argon flow amount is 8.5 ± 1.5Nm
3/ min;
(3) LF refining: adopt CaO-SiO
2-Al
2o
3slag system refining, basicity of slag target value controls 1.5 ~ 2.4, changes in slag process and adds appropriate special silicon, forms white slag, is controlled by silicone content 0.2 ~ 0.25%, and oxygen activity controls to carry out after 20 ~ 70ppm boron alloyed;
(4) RH vacuum-treat: below the 67Pa treatment time is 8 ~ 13min, RH stove target temperature leaving from station is 1565 ± 15 DEG C;
(5) continuous casting adopts long nozzle and submerged nozzle molding casting, prevents secondary oxidation of steel; Oxygen in energy medium: O
2>=99.5%, N
2≤ 100ppm; Argon gas: Ar>=99.98%.
2. the smelting technology of raising cord steel boron recovery rate according to claim 1, is characterized in that:
In described step (1), endpoint carbon content controls 0.73%;
In described step (2), the soft blow time is 7min, and argon pressure is 0.55MPa, and argon flow amount is 8.5Nm
3/ min;
In described step (3), basicity of slag target value is 2.4, and silicone content is 0.25%, and oxygen activity is 33ppm;
In described step (4), below the 67Pa treatment time is 10min, RH stove target temperature leaving from station is 1568 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510375066.3A CN104911301B (en) | 2015-06-30 | 2015-06-30 | Smelting process capable of increasing tire cord steel boron yield |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510375066.3A CN104911301B (en) | 2015-06-30 | 2015-06-30 | Smelting process capable of increasing tire cord steel boron yield |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104911301A true CN104911301A (en) | 2015-09-16 |
| CN104911301B CN104911301B (en) | 2017-05-24 |
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ID=54080741
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510375066.3A Expired - Fee Related CN104911301B (en) | 2015-06-30 | 2015-06-30 | Smelting process capable of increasing tire cord steel boron yield |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104911301B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101503746A (en) * | 2009-03-19 | 2009-08-12 | 新余钢铁股份有限公司 | Method for producing boron steel by converter |
| CN102676948A (en) * | 2012-05-30 | 2012-09-19 | 南京钢铁股份有限公司 | Boron-containing tire cord steel and preparation method thereof |
| CN102994700A (en) * | 2012-11-28 | 2013-03-27 | 武钢集团昆明钢铁股份有限公司 | Smelting method for stably increasing content of boron in boron-containing steel |
-
2015
- 2015-06-30 CN CN201510375066.3A patent/CN104911301B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101503746A (en) * | 2009-03-19 | 2009-08-12 | 新余钢铁股份有限公司 | Method for producing boron steel by converter |
| CN102676948A (en) * | 2012-05-30 | 2012-09-19 | 南京钢铁股份有限公司 | Boron-containing tire cord steel and preparation method thereof |
| CN102994700A (en) * | 2012-11-28 | 2013-03-27 | 武钢集团昆明钢铁股份有限公司 | Smelting method for stably increasing content of boron in boron-containing steel |
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| Publication number | Publication date |
|---|---|
| CN104911301B (en) | 2017-05-24 |
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| TR01 | Transfer of patent right |
Effective date of registration: 20170731 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: WUHAN IRON AND STEEL Co.,Ltd. Address before: 430080 Wuchang, Hubei Friendship Road, No. A, block, floor 999, 15 Patentee before: WUHAN IRON AND STEEL (GROUP) Corp. |
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Granted publication date: 20170524 |
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