CN104911301B - Smelting process capable of increasing tire cord steel boron yield - Google Patents
Smelting process capable of increasing tire cord steel boron yield Download PDFInfo
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- CN104911301B CN104911301B CN201510375066.3A CN201510375066A CN104911301B CN 104911301 B CN104911301 B CN 104911301B CN 201510375066 A CN201510375066 A CN 201510375066A CN 104911301 B CN104911301 B CN 104911301B
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- steel
- boron
- smelting process
- yield
- smelting
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 58
- 239000010959 steel Substances 0.000 title claims abstract description 58
- 229910052796 boron Inorganic materials 0.000 title claims abstract description 47
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000008569 process Effects 0.000 title claims abstract description 32
- 238000003723 Smelting Methods 0.000 title claims abstract description 23
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 34
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000001301 oxygen Substances 0.000 claims abstract description 24
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 24
- 229910052786 argon Inorganic materials 0.000 claims abstract description 17
- 230000000694 effects Effects 0.000 claims abstract description 17
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 13
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000007664 blowing Methods 0.000 claims abstract description 8
- 239000010703 silicon Substances 0.000 claims abstract description 8
- 238000009749 continuous casting Methods 0.000 claims abstract description 5
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 5
- 230000003647 oxidation Effects 0.000 claims abstract description 4
- 238000007670 refining Methods 0.000 claims abstract description 4
- 238000011084 recovery Methods 0.000 claims description 21
- 229920001296 polysiloxane Polymers 0.000 claims description 10
- 239000002893 slag Substances 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 239000011572 manganese Substances 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 238000009491 slugging Methods 0.000 claims description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims 1
- 239000000956 alloy Substances 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 229910000521 B alloy Inorganic materials 0.000 abstract description 5
- 238000009628 steelmaking Methods 0.000 abstract description 3
- 230000002411 adverse Effects 0.000 abstract description 2
- 238000005457 optimization 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
- 239000007788 liquid Substances 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 239000000047 product Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000914 Mn alloy Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 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, a kind of smelting process for improving cord steel boron recovery rate is specifically referred to.
Background technology
Cord steel is the support frame of automobile radial tire, with raising tire intensity, toughness and fatigue performance
Effect, be the representative products of ultra clean steel and the significant product of wire quality level, be known as " wire rod superfine product ".
In recent years domestic automobile industry is booming, effectively drives the demand of cord steel.In the serious surplus of steel production capacity
Under overall background, iron and steel enterprise attempts to improve competitiveness by product up-gradation, directly results in and there was only several enterprise's energy in the past
The cord steel of production, faces the market competition of fierceness.
The improvement that appropriate boron is conducive to plasticity is added in cord steel, steel wire products enterprise commerical test shows, through the micro- conjunction of boron
The high-carbon steel wire rod of aurification, when metallic article is pulled into, process plastic is high, and is conducive to improving cord steel hardenability, thus extensively
Using.But the free boron of excess can make the material have the tendency of embrittlement, thus smelting process boron component hit rate need to be improved, reduced into
Partial wave is moved.
Boron chemical property is active, easily with oxygen, nitrogen reaction generation oxide and nitride, so that effective boron contains in reducing steel
Amount.Cord steel is boron alloyed to be realized by adding ferro-boron, ferro-boron expensive (about 2.4 ten thousand yuan/ton) and
Recovery rate is relatively low, and Boron contents fluctuation is larger in causing steel, influences the rate of steel products produced to steel ingots and production cost.Existing cord steel smelting process
Boron recovery rate is low and unstable, and Boron contents fluctuation is larger in causing steel, not only increases smelting cost, and influence cord steel is become a useful person
Rate and final products performance.
Mark is found by cord steel quality in kind, blue or green steel improves cord steel hardenability effect is significant by boron alloyed,
It is 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 raising boron alloy recovery rate
Research is conducive to stablizing the quality of cord product made from steel, reduces production cost, improves the market competitiveness.
The content of the invention
To overcome above-mentioned the deficiencies in the prior art, the purpose of the present invention is by controlling key process parameter, there is provided a kind of
Improve the smelting process of cord steel boron recovery rate so that boron alloy recovery rate reaches more than 80%.
To achieve the above object, the smelting process of the raising cord steel boron recovery rate that the present invention is provided, comprises the following steps：
(1) electric furnace or Converter Oxigen Blowing are smelted：Endpoint carbon content is controlled 0.71~0.75%, when going out molten steel 1/4, with steel stream
Silicon, manganese alloy and carburant are added, C, Si, Mn content is by standard min control；
(2) argon station blowing：The soft blow time be 6~8min, argon pressure be 0.55 ± 0.05MPa, argon flow amount be 8.5 ±
1.5Nm3/min；
(3) LF refining：Using CaO-SiO2-Al2O3Slag system is refined, and basicity of slag desired value is controlled in 1.5~2.4, slugging
Appropriate spy's silicon is added in journey, white slag is formed, by silicone content control 0.2~0.25%, oxygen activity control is laggard in 20~70ppm
Row is boron alloyed；
(4) RH application of vacuum：Below 67Pa process times are 8~13min, and RH stoves target temperature leaving from station is 1565 ± 15
℃；
(5) continuous casting uses long nozzle and submersed nozzle molding casting, prevents secondary oxidation of steel；Oxygen in energy medium
Gas：O2>=99.5%, N2≤100ppm；Argon gas：Ar >=99.98%.
Preferably, endpoint carbon content is controlled 0.73% in the step (1)；In the step (2) during soft blow
Between be 7min, argon pressure is 0.55MPa, and argon flow amount is 8.5Nm3/min；Basicity of slag desired value is in the step (3)
2.4, silicone content is 0.25%, and oxygen activity is 33ppm；In the step (4) below 67Pa process times be 10min, RH stoves from
Target temperature of standing is 1568 DEG C.
The advantage of the invention is that：The present invention is by adjusting smelting process key governing factor so that boron alloyed process
Boron recovery rate reach more than 80%, efficiently solve that traditional handicraft boron recovery rate is low, boron component fluctuates larger problem, thoroughly
The boron alloyed improper adverse effect to steel performance is eliminated, for cord steel quality optimization provides technology support.Together
When, the present invention can be completed without extras under existing process equipment condition, and safety non-pollution.The present invention, comprehensive control
System steel-making each operation, by adjusting tapping carbon content, silicone content and the factor such as oxygen activity in steel, improves boron alloyed receipts
Rate so that boron alloy recovery rate reaches more than 80%, effectively reduces production cost, improves composition first-hit yield and lumber recovery.
Brief description of the drawings
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.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Various embodiments of the present invention and comparative example shown in figure are produced according to following smelting process：Electric furnace or converter → argon
Stand → LF → RH → continuous casting.
Its specific smelting process step is as follows：
(1) electric furnace or Converter Oxigen Blowing are smelted, endpoint carbon content control 0.71~0.75%, when going out molten steel 1/4, are added with steel stream
Enter silicon, manganese alloy and carburant, C, Si, Mn content are by standard min control；
(2) argon station blowing, 6~8min of soft blow, 0.55 ± 0.05MPa of argon pressure, 8.5 ± 1.5Nm of argon flow amount3/
min；
(3) LF refining, using CaO-SiO2-Al2O3Slag system is refined, and basicity of slag desired value is controlled in 1.5~2.4, slugging
Appropriate spy's silicon is added in journey, white slag is formed, by silicone content control 0.2~0.25%, oxygen activity control is laggard in 20~70ppm
Row is boron alloyed；
(4) RH application of vacuum, below 67Pa process times：8~13min, RH stove target temperature leaving from station：1565±15℃；
(5) continuous casting uses long nozzle and submersed nozzle molding casting, prevents secondary oxidation of steel.
Wherein embodiment 1~12 and comparative example smelting process and boron recovery rate, are shown in Table 1.
The embodiment of table 1 and comparative example smelting process and boron recovery rate
Smelting process mechanism of the invention is as follows：
Carbon content：There is concentration of carbon and oxygen concentration under carbon and oxygen balance, i.e. uniform temperature in steel inversely proportional.For in reduction steel
Oxygen concentration, reduces boron alloy scaling loss, therefore by endpoint carbon content of converter control 0.71%~0.75%.
Silicone content：The reaction of silicon and oxygen therefore properly increases silicone content in steel prior to the oxidation reaction of boron, can effectively drop
Oxygen activity in low steel, so that the recovery rate of boron is raised.Therefore it is boron alloyed before, in steel silicone content control 0.2~0.25%.
Oxygen activity：Oxygen activity increase certainly will reduce the recovery rate of boron in steel, therefore, received to improve steel performance, improving boron
Yield, the oxygen activity in it should reduce steel as far as possible under process conditions are allowed.Thus, it is boron alloyed before, oxygen activity control 20~
70ppm。
Energy medium requirement：Boron not only reacts with oxygen, moreover it is possible to N reaction generation BN, thus smelting process oxygen blast or Argon
It is gases used to ensure degree of purity higher.Thus energy medium requirement, oxygen：O2>=99.5%, N2≤100ppm；Argon gas：Ar
>=99.98%.
Boron recovery rate is brought up to more than 80% by the present invention by controlling smelting process key factor from 60%, and effect shows
Write.Therefore technical scheme has important meaning for lifting cord steel quality, reducing production cost and catch up with and surpass blue or green steel
Justice.
Claims (1)
1. a kind of smelting process for improving cord steel boron recovery rate, comprises the following steps：
(1) electric furnace or Converter Oxigen Blowing are smelted：Endpoint carbon content is controlled 0.73%, when going out molten steel 1/4, silicon, manganese is added with steel stream
Alloy and carburant, C, Si, Mn content is by standard min control；
(2) argon station blowing：The soft blow time is 7min, and argon pressure is 0.55MPa, and argon flow amount is 8.5Nm3/min；
(3) LF refining：Using CaO-SiO2-Al2O3Slag system is refined, and basicity of slag desired value is controlled 2.4, is added during slugging
Appropriate spy's silicon, forms white slag, and by silicone content control 0.25%, oxygen activity control carries out boron alloyed after 33ppm；
(4) RH application of vacuum：Below 67Pa process times are 10min, and RH stoves target temperature leaving from station is 1568 DEG C；
(5) continuous casting uses long nozzle and submersed nozzle molding casting, prevents secondary oxidation of steel；Oxygen in energy medium：O2≥
99.5%, N2≤100ppm；Argon gas：Ar >=99.98%.
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 |
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| Publication Number | Publication Date |
|---|---|
| CN104911301A CN104911301A (en) | 2015-09-16 |
| CN104911301B true CN104911301B (en) | 2017-05-24 |
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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 |
|---|---|
| CN104911301A (en) | 2015-09-16 |
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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 |