CN101653819B - Continuous casting tundish hollow particle carbon-free covering agent and preparation method thereof - Google Patents
Continuous casting tundish hollow particle carbon-free covering agent and preparation method thereof Download PDFInfo
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- CN101653819B CN101653819B CN2009100154600A CN200910015460A CN101653819B CN 101653819 B CN101653819 B CN 101653819B CN 2009100154600 A CN2009100154600 A CN 2009100154600A CN 200910015460 A CN200910015460 A CN 200910015460A CN 101653819 B CN101653819 B CN 101653819B
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- Prior art keywords
- covering agent
- continuous casting
- carbon
- hollow particle
- casting tundish
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- 239000002245 particle Substances 0.000 title claims abstract description 29
- 238000009749 continuous casting Methods 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 239000002994 raw material Substances 0.000 claims description 15
- 239000011324 bead Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 239000011230 binding agent Substances 0.000 claims description 8
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 7
- 229920002261 Corn starch Polymers 0.000 claims description 7
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical group [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 7
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 7
- 239000008120 corn starch Substances 0.000 claims description 7
- 229940099112 cornstarch Drugs 0.000 claims description 7
- 239000011734 sodium Substances 0.000 claims description 7
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 7
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000012856 packing Methods 0.000 claims description 5
- 238000001694 spray drying Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 3
- 239000004615 ingredient Substances 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 34
- 239000010959 steel Substances 0.000 abstract description 34
- 239000002893 slag Substances 0.000 abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052799 carbon Inorganic materials 0.000 abstract description 10
- 238000005266 casting Methods 0.000 abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 6
- 230000003647 oxidation Effects 0.000 abstract description 5
- 238000007254 oxidation reaction Methods 0.000 abstract description 5
- 238000009413 insulation Methods 0.000 abstract description 4
- 238000003723 Smelting Methods 0.000 abstract description 2
- 229910052742 iron Inorganic materials 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 18
- 229910004298 SiO 2 Inorganic materials 0.000 description 11
- 230000000694 effects Effects 0.000 description 11
- 239000000395 magnesium oxide Substances 0.000 description 9
- 235000019738 Limestone Nutrition 0.000 description 7
- 239000006028 limestone Substances 0.000 description 7
- 230000004907 flux Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000004927 fusion Effects 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 3
- HIGRAKVNKLCVCA-UHFFFAOYSA-N alumine Chemical compound C1=CC=[Al]C=C1 HIGRAKVNKLCVCA-UHFFFAOYSA-N 0.000 description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000010436 fluorite Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000012257 stirred material Substances 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010813 municipal solid waste Substances 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000004523 agglutinating effect Effects 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- GPWDPLKISXZVIE-UHFFFAOYSA-N cyclo[18]carbon Chemical compound C1#CC#CC#CC#CC#CC#CC#CC#CC#C1 GPWDPLKISXZVIE-UHFFFAOYSA-N 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
Abstract
The invention relates to a continuous casting tundish hollow particle carbon-free covering agent, belonging to the iron and steel smelting field. The carbon-free covering agent comprises the following components by weight percent: 25-35% of SiO2, 8-20% of Al2O3, less than 1.5% of Fe2O3, 25-35% of CaO, 8-16% of MgO and less than 0.5% of H2O, wherein 0.15-1.0mm of particles account for 90-100% and the bulk specific weight is 0.6-0.9g/cm<3>. The continuous casting tundish hollow particle carbon-free covering agent has good spreadability, when added the covering agent can be molten fast and can cover the whole surface of molten steel, thus avoiding the secondary oxidation of molten steel; the covering agent has function of absorbing inclusion, can purify molten steel and increase the casting blank quality; the covering agent has good thermal insulation property, thus significantly reducing the temperature loss of molten steel; the slag of the covering agent can not incrust and stick to the stopper rod; and the content of carbon in molten steel is not increased.
Description
Technical field:
The invention belongs to field of iron and steel smelting, relate to a kind of tundish covering flux.Can improve steel quality, prolong tundish service life, not carburetting has good heat insulating ability and spreadability, has good application prospects.
Technical background:
Both at home and abroad steel mill is in order to keep molten steel temperature, improve steel quality, to prolong tundish service life, all doing number of research projects aspect the production of tundish covering flux and the application technology in recent years, and obtaining remarkable effect.The production practices of steel mill both at home and abroad prove that the performance of hollow particle carbon-free covering agent has irreplaceable effect for the steel grade that specific (special) requirements is arranged.
Carbon-free covering agent is the same with continuous casting covering slag all to be with CaO-SiO
2-Al
2O
3Be base-material, Na
2O, CaF
2Deng a kind of silicate material that is flux.Technological parameters such as product result of use and steel grade, middle bag size, shape are complementary.
CN1778493 discloses a kind of cap agent with light alkaline particle steel coating, it is characterized in that having following constituent and percentage by weight to constitute: SiO
218%～26%; CaO 26%～34%; MgO 6%～12%; Al
2O
35%～8%; Fe
2O
30.5%～2%; Fixed carbon 18%～26%.Bulk density is 0.4～0.7g/cm
3The deficiency of this invention is: ladle covering agent is not the hollow bead coverture, and heat-insulating property is starkly lower than the hollow bead coverture; Fixed carbon is 18%～26% in the coverture, and carbon containing and carbon content are high, are prone to cause molten steel recarburization in the use.
Summary of the invention:
An object of the present invention is to provide a kind of continuous casting tundish hollow particle carbon-free covering agent, solve specific (special) requirements steel grade carburetting problem, bring into play simultaneously in the effect of casting process tundish metallurgy.
Another object of the present invention provides a kind of preparation method technology of continuous casting tundish hollow particle carbon-free covering agent.
Hollow particle carbon-free covering agent has significant adiabatic heat-insulation effect, prevent molten steel face crust, secluding air, prevents secondary oxidation of steel, absorb molten steel face come-up non-metallic inclusion, improve watering property of molten steel and molten steel degree of purity.
A kind of continuous casting tundish hollow particle carbon-free covering agent is characterized in that mainly comprising by mass percentage following component:
SiO
2 25～35％
Al
2O
3 8～20％
Fe
2O
3 0～1.5％
CaO 25～35％
MgO 8～16％
H
2O 0～0.5％
Binding agent 1～2.5%
Solvent 1～10%.
Preferably, hollow particle carbon-free covering agent is a hollow bead, carbon containing, the granularity particle between 0.15～1.0mm is not 90%-100%.
Preferably, hollow particle carbon-free covering agent bulk density: 0.6g/cm
3～0.9g/cm
3
Preferably, the hollow particle carbon-free covering agent fusing point is 1350 ± 50 ℃.
Preferably, hollow particle carbon-free covering agent basicity (CaO/SiO
2Mass ratio) be 0.9～1.3.
Preferably, above-mentioned binding agent is the mixture of sodium carboxymethylcellulose and cornstarch.
Preferably, above-mentioned solvent is Na
2O, CaF
2, Li
2O or B
2O
3In one or more.
The preparation technology of described continuous casting tundish hollow particle carbon-free covering agent may further comprise the steps:
(1) it is levigate to put into ball mill to said various raw materials, granularity 200 orders;
(2) batching is put into taper agitator batch mixing with confected materials, mixing time 12～18 minutes;
(3) mixed material is put into the stirring water mill; 40%-50% by raw material weight adds entry, and the percentage of pressing raw material weight adds binding agent sodium carboxymethylcellulose and cornstarch, and its addition is respectively 1.5% and 0.5%; Grind slurrying, 1～1.5 hour water mill time;
(4) process hollow bead with spray drying tower, the particle of granularity between 0.15～1.0mm is 90%-100%, and moisture is 0～0.5%;
(5) packing of product warehouse-in.
Preferably, according to operation card ingredients by weight error less than ± 0.3%.
Coverture is mainly reflected in the following aspects to the influence of process for making:
1, the basicity of coverture
Ratio between slag neutral and alkali oxide and acidic oxide is called the basicity of slag.Conventional sign R or B represent.Basicity is the important indicator that the reflection coverture absorbs field trash ability in the molten steel, also is simultaneously the important indicator of reflection to the tundish erosion degree.Usually basicity is big, and the ability of absorbing foreign matter is also big, and is little to the tundish erosion degree simultaneously, prolongs tundish service life.Generally we use is dual alkalinity, and the strongest acid oxide is SiO in the slag
2, the strongest oxide of alkalescence is CaO, dual alkalinity is with CaO and SiO
2The ratio of mass fraction represent.
R＝ω(CaO)/ω(SiO
2)
2, the fusion temperature of coverture
Fusion temperature depends primarily on the composition of coverture.According to the use needs, use Na usually
2O, CaF
2, Li
2O, B
2O
3Regulate Deng flux.General fusion temperature is controlled between 1200～1450 ℃.If fusion temperature is low excessively, its heat insulation effect is undesirable; Too high, it is too thin to can not form liquid slag layer or liquid slag layer, will reduce it and prevent secondary oxidation, the ability of absorbing foreign matter.
3, the effect of carbon in the coverture
The effect of carbon is the molten speed that reduces slag in the coverture; Improve the slag adiabatic heat insulating effect, improve the agglutinating property of coverture simultaneously, helpful to preventing secondary oxidation of steel; But carbon content high in the coverture often causes the casting process molten steel recarburization; In mild steel (carbon content is less than 0.25% steel, like the 20CrMnTiH pinion steel in the steel) production process, carbon content low in the coverture also often causes the casting process molten steel recarburization.This is the problem that must solve in the continuous casting production process.
4, the effect of hollow bead coverture
Adopt the mist projection granulating production method to make coverture become hollow bead, can form an adiabatic separation layer, can reduce the outside heat transfer rate of molten steel effectively, play the effect of heat-insulation and heat-preservation, effect obviously is superior to the full particle coverture.
5, basic slag charge is natural minerals (like wollastonite, a lime stone etc.).
6, flux material is an amount of Na
2O, K
2O, CaF
2Fusion temperature Deng the adjustment coverture.
The invention has the beneficial effects as follows: this continuous casting tundish hollow particle carbon-free covering agent performance has: the spreadability that (1) is good, can melt the whole molten steel surface of covering after the adding rapidly, and help avoiding secondary oxidation of steel; (2) performance of good adsorption field trash, the ability purify hot metal improves slab quality; (3) heat-insulating property is good, can obviously reduce the liquid steel temperature loss; (4) the coverture slag does not crust, not sticking stopper; (5) not carburetting of molten steel.
The specific embodiment
Case study on implementation:
[embodiment 1]
Take by weighing raw silicon lime stone (CaO content 45%, SiO
2Content 50%) 50kg, alumine (Al
2O
3Content 80%) 14kg, magnesia (MgO content 80%) 12kg, fluorite (CaF
2Content 90%) 2kg, calcined soda for industry (Na
2O content 56%) 5kg, lime stone (CaO content 48%) 17kg, each raw material granularity is 200 orders.Put into the taper agitator to various raw material and stirred material 15 minutes; Mixed material is put into the stirring water mill, add water 50kg (water content in the raw material and the influence of water distribution relation are very little) and add binding agent sodium carboxymethylcellulose 2kg and cornstarch 0.5kg); Grind slurrying, 1 hour water mill time, process hollow bead with spray-drying then.About granularity 0.15mm～1.0mm:98%, bulk density 0.6g/cm3, H
2O＜0.5%.This casting tundish hollow particle carbon-free covering agent basicity (CaO/SiO
2) be 1.23, fusing point is 1300 ℃ of (experiment records with the fusing point instrument) packing of product warehouse-ins.
[embodiment 2]
Take by weighing raw silicon lime stone (CaO:45%, SiO
2: 50%) 54kg, alumine (Al
2O
3: 80%) 14kg, magnesia (MgO:80%) 12kg, fluorite (CaF
2: 90%) 1kg, calcined soda for industry (Na
2O:56%) 2kg, lime stone (CaO:48%) 17kg, each raw material granularity is 200 orders.Put into the taper agitator to various raw material and stirred material 15 minutes; Mixed material is put into the stirring water mill, add water 50kg (water content in the raw material and the influence of water distribution relation are very little) and add binding agent sodium carboxymethylcellulose 2kg and cornstarch 0.5kg); Grind slurrying, 1.5 hours water mill time, process hollow bead with spray-drying then.Granularity 0.15mm～1.0mm:95%, bulk density 0.8g/cm3, H
2O＜0.5%.This casting tundish hollow particle carbon-free covering agent basicity (CaO/SiO
2) be 1.20, fusing point is 1350 ℃ of (experiment records with the fusing point instrument) packing of product warehouse-ins.
[embodiment 3]
Take by weighing raw silicon lime stone (CaO:45%, SiO
2: 50%) 57kg, alumine (Al
2O
3: 80%) 14kg, magnesia (MgO:80%) 12kg, lime stone (CaO:48%) 17kg (taking by weighing each raw material granularity is 200 orders).Put into the taper agitator to various raw material (comprise flux: fluorite, magnesia, calcined soda for industry) and stirred material 15 minutes; Mixed material is put into the stirring water mill, add water 50kg (water content in the raw material and the influence of water distribution relation are very little) and add binding agent sodium carboxymethylcellulose 2kg and cornstarch 0.5kg; Grind slurrying, 1 hour water mill time, process hollow bead with spray-drying then.Granularity 0.15mm～1.0mm:90%～100%, bulk density 0.6g/cm3～0.9g/cm3, H
2O＜0.5%.This casting tundish hollow particle carbon-free covering agent basicity (CaO/SiO
2) be 1.19, fusing point is 1400 ℃ of (experiment records with the fusing point instrument) packing of product warehouse-ins.
Claims (3)
1. continuous casting tundish hollow particle carbon-free covering agent is characterized in that mainly comprising by mass percentage following component:
The particle of above-mentioned continuous casting tundish hollow particle carbon-free covering agent granularity between 0.15～1.0mm is 90%-100%, bulk density: 0.6g/cm
3～0.9g/cm
3, fusing point is 1300～1400 ℃, and basicity is 0.9～1.2, and binding agent is sodium carboxymethylcellulose and cornstarch, and solvent is Na
2O, CaF
2, Li
2O or B
2O
3In one or more.
2. the preparation technology of the described continuous casting tundish of claim 1 hollow particle carbon-free covering agent is characterized in that may further comprise the steps:
(1) it is levigate to put into ball mill to said various raw materials, granularity 200 orders;
(2) batching is put into taper agitator batch mixing with confected materials, mixing time 12～18 minutes;
(3) mixed material is put into the stirring water mill; 40%-50% by raw material weight prepares water, and the percentage of pressing raw material weight adds binding agent sodium carboxymethylcellulose and cornstarch, and its addition is respectively 1.5% and 0.5%; Grind slurrying, 1-1.5 hour water mill time;
(4) process hollow bead with spray drying tower, the particle of granularity between 0.15～1.0mm is 90%-100%, and moisture is 0～0.5%;
(5) packing of product warehouse-in.
3. right is wanted the preparation technology of 2 described continuous casting tundish hollow particle carbon-free covering agents, it is characterized in that, according to operation card ingredients by weight error less than ± 0.3%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100154600A CN101653819B (en) | 2009-05-25 | 2009-05-25 | Continuous casting tundish hollow particle carbon-free covering agent and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100154600A CN101653819B (en) | 2009-05-25 | 2009-05-25 | Continuous casting tundish hollow particle carbon-free covering agent and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101653819A CN101653819A (en) | 2010-02-24 |
| CN101653819B true CN101653819B (en) | 2012-04-04 |
Family
ID=41708393
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| CN2009100154600A Expired - Fee Related CN101653819B (en) | 2009-05-25 | 2009-05-25 | Continuous casting tundish hollow particle carbon-free covering agent and preparation method thereof |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102836979A (en) * | 2011-06-24 | 2012-12-26 | 中冶连铸技术工程股份有限公司 | Tundish covering agent |
| CN102259175B (en) * | 2011-07-16 | 2013-03-13 | 鞍山市和丰耐火材料有限公司 | Production method for Ca-Al-Mg carbon-free tundish covering flux |
| CN102618694B (en) * | 2012-03-31 | 2014-03-12 | 芜湖县天海耐火炉料有限公司 | Refining heat insulation covering agent and preparation method thereof |
| CN102807382A (en) * | 2012-08-27 | 2012-12-05 | 苏州罗卡节能科技有限公司 | Nonmetallic hollow sphere |
| CN103111592B (en) * | 2013-02-26 | 2015-01-28 | 莱芜钢铁集团有限公司 | Tundish covering agent |
| CN103341606B (en) * | 2013-07-03 | 2015-02-11 | 北京科技大学 | High-magnesium covering agent material capable of being used for tundish and preparing method thereof |
| CN111154950A (en) * | 2019-12-31 | 2020-05-15 | 高英 | Metallurgical heat-insulating covering agent |
| CN112126739A (en) * | 2020-09-10 | 2020-12-25 | 山东钢铁集团日照有限公司 | Method for pressing smoke in ladle |
| CN114226665A (en) * | 2021-11-12 | 2022-03-25 | 武汉钢铁有限公司 | Tundish covering agent for IF steel continuous casting and application thereof |
| CN115007845B (en) * | 2022-06-15 | 2024-03-15 | 攀钢集团攀枝花钢铁研究院有限公司 | Drainage sand filling method in high-clean steel production process |
| CN115141000B (en) * | 2022-07-13 | 2023-04-21 | 山东国茂冶金材料有限公司 | Smoke inhibitor for hot-metal bottle and preparation method and application thereof |
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Effective date of registration: 20120321 Address after: 250101 Ji'nan Industrial Road, Shandong, No. 21 Patentee after: Jinan Iron and Steel Co., Ltd. Address before: 271104, Xinxing Road, Gangcheng District, Shandong, Laiwu, 21 Patentee before: Laiwu Iron Co., Ltd. |
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| C56 | Change in the name or address of the patentee |
Owner name: SHANDONG IRON + STEEL CO., LTD. Free format text: FORMER NAME: JI'NAN IRON + STEEL CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 250101 Ji'nan Industrial Road, Shandong, No. 21 Patentee after: Shandong Iron & Steel Group Co., Ltd. Address before: 250101 Ji'nan Industrial Road, Shandong, No. 21 Patentee before: Jinan Iron and Steel Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120404 Termination date: 20170525 |
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| CF01 | Termination of patent right due to non-payment of annual fee |