CN101993972B - Arc furnace steelmaking method - Google Patents
Arc furnace steelmaking method Download PDFInfo
- Publication number
- CN101993972B CN101993972B CN2010105299666A CN201010529966A CN101993972B CN 101993972 B CN101993972 B CN 101993972B CN 2010105299666 A CN2010105299666 A CN 2010105299666A CN 201010529966 A CN201010529966 A CN 201010529966A CN 101993972 B CN101993972 B CN 101993972B
- Authority
- CN
- China
- Prior art keywords
- steel
- arc furnace
- steelmaking process
- molten
- furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
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
Abstract
The invention discloses an arc furnace steelmaking method, comprising the following steps: preparing raw materials from 30-70% of molten iron, 5-20% of high quality scrap steel, 20-45% of cheap scrap steel and 4-5% of other auxiliary materials based on weight percentage; and refining the raw materials into molten steel by an arc furnace. By the steelmaking method of the invention, electric energy consumption can be reduced so as to lower the steelmaking cost.
Description
Technical field
The present invention relates to a kind of arc furnace steelmaking process, specifically, the present invention relates to a kind of arc furnace steelmaking process that can reduce the smelting energy consumption.
Background technology
Along with the shortage day by day of world energy sources, resource, the recycle of Nonrenewable resources such as coal, ore more and more receives the attention of metallurgy industry.Smelter belongs to highly energy-consuming type enterprise, and its energy consumption accounts for about 10% of national energy consumption, accounts for 15.25% of industrial sector energy consumption.Electric-arc furnace steelmaking is generally acknowledged by world's metallurgy industry as the metallurgical pattern of a kind of recycling economy of Sustainable development, has got into since the new millennium, and the electric-arc furnace steelmaking ratio of each developed country continues to rise year by year.As big steel country, China's electric arc furnace output of steel has reached 5,000 ten thousand tons/year.
Traditional arc furnace steeling process flow process is: full waste steel ingredient technology → electric arc furnace → LF stove (→ VD stove) → continuous casting (die casting) → rolling.Yet the ton smelting steel cost of this traditional process for making is high, and rhythm of production is slow, and environmental pollution is serious.Adopt the energy consumption of electric-arc furnace steelmaking of this technology bigger, only the energy consumption of electric-arc furnace steelmaking industry just accounts for 20% of domestic metallurgical total energy consumption.
Therefore, need a kind of arc furnace steelmaking process that can reduce the smelting energy consumption of exploitation.This is to reducing electric arc furnace ton smelting steel cost, and faster production rhythm alleviates environmental pollution etc. and has important practical significance.
Summary of the invention
One side of the present invention provides a kind of arc furnace steelmaking process; This method may further comprise the steps: preparation raw material, and by weight, said raw material comprises 30% to 70% molten iron; 5% to 20% high-quality steel scrap, 20% to 45% cheap steel scrap and other auxiliary material of 4% to 5%; Utilize electric arc furnace that raw material is refined into molten steel.
Method for making steel of the present invention also can be included in and refine into after the molten steel, utilizes LF stove and VD stove that molten steel is carried out refining, and wherein, LF stove smelting cycle is not less than 32 minutes/stove, and the compressed steel time between LF stove and the VD stove is no more than 15 minutes.
Processings of before molten steel gets into the VD stove, also can skimming, taking off the quantity of slag is 1/2 to 2/3 of the interior refining slag quantity of slag of ladle.
In the vacuum-treat process of VD stove, argon flow amount can be 150L/min to 280L/min, and argon pressure can be 0.2MPa to 0.3MPa.
After the vacuum-treat of VD stove, can add insulating covering agent, keep soft blow so that top of the slag fine motion.The time of soft blow can be 12 minutes to 30 minutes, then molten steel is carried out continuous casting.
The saturation steam supply VD stove that fume afterheat in the electric arc furnace capable of using produces is produced required thermal source.
Molten clear carbon content can be: soft steel >=0.30%; Medium carbon steel >=0.45%; High carbon steel >=0.60%.Endpoint carbon content can be: soft steel >=0.08%; Medium and high carbon steel >=0.15%.Tapping temperature can be: 1530 ℃ to 1580 ℃ in soft steel; 1520 ℃ to 1570 ℃ in medium carbon steel; 1510 ℃ to 1560 ℃ in high carbon steel.
According to method for making steel of the present invention,, therefore can reduce even interrupt power supply fully because the heat that produces in the heat of the molten iron that adds itself and the oxygen blast process can be kept the temperature in the stove.Therefore, utilize, can greatly reduce current consumption, thereby can cut down the consumption of energy, save production cost according to smelting process of the present invention.
Description of drawings
Through the description of carrying out below in conjunction with accompanying drawing to embodiment, above-mentioned and/or other purposes of the present invention and advantage will become apparent, wherein:
Fig. 1 is according to the schema of arc furnace steelmaking process of the present invention;
Fig. 2 is the schema according to the bootstrap system of arc furnace steelmaking process of the present invention.
Embodiment
Exemplary embodiment of the present invention is described below with reference to accompanying drawings.Embodiments of the invention shown in the drawings only are to be completely and completely in order to make the disclosure yet these embodiment are provided, rather than from restriction the object of the invention.The embodiment that the invention is not restricted in this elaboration, but the intention covering comprises various modifications and change within the scope of the invention.
Fig. 1 is according to the schema of arc furnace steelmaking process of the present invention, and Fig. 2 is the schema according to the bootstrap system of arc furnace steelmaking process of the present invention.To see figures.1.and.2 below and describe exemplary embodiment of the present invention.
Method of the present invention comprises: preparation raw material (101), and by weight, said raw material comprises 30% to 70% molten iron, 5% to 20% high-quality steel scrap, 20% to 45% cheap steel scrap and other auxiliary material of 4% to 5%; Utilize electric arc furnace that raw material is refined into molten steel (102).
Wherein, The high-quality steel scrap is the steel scrap that shape, size and composition and density all meet the electric arc furnace smelting requirement; Vary in size high-quality steel scrap standard difference, but characteristics such as the high-quality steel scrap has that harmful element is few, the recovery is high, easy handling, smelting speed are fast with stove because the type of furnace is different.The non-limiting example of high-quality steel scrap comprises the inner steel toe that reclaims of steel mill, it is useless etc. to roll.Here, cheap steel scrap is meant and has different shortcomings, or harmful element content height or density is low or size exceeds standard or the like steel scrap.The non-limiting example of cheap steel scrap comprises slag steel, jar group, jar iron, magnesium iron and beans steel etc.Auxiliary material comprises: lime, light dolomite or MAG block etc., and be electric-arc furnace steelmaking and use slag making materials, be used for electric arc furnace dephosphorization, the degassing and submerged arc etc., light dolomite or MAG block increase content of magnesia in the slag, play a part the protection furnace lining.
Because the defective of cheap steel scrap, therefore need carry out reasonably combinedly with high-quality steel scrap and molten iron, and adopt reasonable technology, thereby can reduce the harm that this type of steel scrap brings as far as possible, the utilization of realization resource circulation.For example: when molten iron surpasses 60%, can suitably add slag steel and beans steel, both guarantee rhythm, can prevent the molten iron surplus again and cause the waste of heat; When producing sulphur free-cutting steel, can cooperate the adding magnesium iron, though the magnesium iron sulfur-bearing is higher, concerning sulphur free-cutting steel, element sulphur is a beneficial element, has therefore reduced the adding of subsequent handling sulphur iron, sulphur line etc.; When producing little square billet, it is slower to smelt rhythm, can add part lumpiness, larger-size steel scrap; When molten iron is on the low side, can suitably allocate the higher jar group of carbon containing, jar iron or the like into.
For the ease of smelting, in the preparation raw material process, should accomplish following some: fine and close down, go up loose, middle high, low, stove gate does not have aniseed all around.Through raw material is distributed like this, have that electrode is easy to " wearing well ", the furnace wall is not easy advantages such as bridging and easy handling.
In utilizing the process of electric-arc furnace steelmaking,, will melt clear carbon, end point carbon and tapping temperature and be controlled in the following described scope according to different steel grades.Molten clear carbon: soft steel >=0.30%, medium carbon steel >=0.45%, high carbon steel >=0.60%.End point carbon: soft steel >=0.08%, medium and high carbon steel >=0.15%.Tapping temperature: 1530 ℃～1580 ℃ in soft steel, 1520 ℃～1570 ℃ in medium carbon steel, 1510 ℃～1560 ℃ in high carbon steel.Through after the electric arc furnace smelting, the preliminary dexidation of molten steel is good, and slag is speiss or yellowish-white slag to the refining position, and this has shown low dissolved oxygen content.In addition, the content of the alloying element in the molten steel behind the electric arc furnace smelting is all controlled by composition requirement of the present invention, the equal conformance with standard requirement of residual element content.
In the process of electric-arc furnace steelmaking, adopt the different operation method according to different iron water amounts, oxygen pressure situation.Specifically:
(1) when the molten iron amount of being blended into for more than or equal to 30% and when being no more than 40%, the strict counterweight of carrying out first and second (even three times) material is avoided binder.Omnidistance is main to send electricity, late oxygen blast; Temperature before 1530 ℃, epoxy or hypoxemia oxygen supply, the oxygen total flux is not more than 1500m
3/ h suitably increases surplus steel amount and recrement amount, and the whole process smelting of dusting.
(2) oxygen pressure is more than or equal to 1.0MPa and be no more than 1.2MPa; And the molten iron amount of being blended into is greater than 40% and be no more than 50%; Yu Gangliang be controlled at single stove tap greater than 15% and be no more than 30%, help early slagging, oxygen blast early, improve electric arc furnace dephosphorization efficient and oxygen utilization rate.Reinforced back prompt delivery electricity is done suitable adjustment according to molten clear carbon situation in actual production process, molten clear carbon is higher, increases the oxygen supply amount, otherwise, reduce the oxygen supply amount, guarantee not peroxo-of molten steel.
(3) oxygen pressure is greater than 1.2MPa and be no more than 1.4MPa: and the molten iron amount of being blended into is greater than 50% and be no more than 60%, suitably power failure oxygen blast in early stage.
(4) oxygen pressure is greater than 1.4MPa, and the molten iron amount of being blended into is greater than 60% and be no more than 70%, and oxygen blast fully has a power failure.
From the aforesaid operations method, can find out, when raising,, therefore can reduce even complete interrupt power supply because the heat that produces in the heat of molten iron itself and the oxygen blast process can be kept the temperature in the stove along with increase of the molten iron amount of being blended into and oxygen pressure.Therefore, utilize, can greatly reduce current consumption, thereby can cut down the consumption of energy, save production cost according to smelting process of the present invention.
After smelting completion, the molten steel that obtains is transferred in the ladle.Usually, the ladle freeboard is greater than 600mm～700mm.For newly watering order 1,2 stoves, also suitably reduce tap usually according to the production needs.Also can add an amount of pre-deoxidant during tapping, and, suitably adjust the pre-deoxidant add-on according to actual terminal point situation by processing requirement.Suitably adjust tapping temperature according to smelting steel grade, tap hole size, ladle situation, rhythm situation before the tapping.Those skilled in the art can confirm the add-on and the tapping temperature of reductor according to the expertise of its grasp.
In order further to improve the quality of molten steel, also need carry out refining treatment to molten steel.Wherein, can comprise ladle refining (LF) stove refining (103) and vacuum outgas (VD) stove refining (104), wherein, LF stove smelting cycle is not less than 32 minutes/stove, and the compressed steel time between LF stove and the VD stove is no more than 15 minutes.
In FL stove refining process, can add an amount of reductor and aluminum steel, guarantee LF stokehold phase deoxidation, can add slag making materials simultaneously and carry out slag making.After thin slag is made, constituent contents such as sampling analysis C, Mn, Si, S, P immediately, and add the reduction carbon dust.In whole smelting process, remain bell, oven door sealing is good, form fast to guarantee white slag.According to aluminium content, suitably adjust the silicon-calcium wire feed quantity before the tapping, carry out inclusion modification and handle.
Processings of before molten steel gets into the VD stove, also can skimming, taking off the quantity of slag is 1/2 to 2/3 of the interior refining slag quantity of slag of ladle.For different steel grades, can formulate different VD stove vacuum-treat and molten steel temperature in tundish control requirement according to the requirement in the TM.In VD stove vacuum-treat process, utilize argon gas that molten steel is carried out soft blow, wherein argon flow amount is 150L/min to 280L/min, argon pressure is 0.2MPa to 0.3Mpa, stirs phenomenon thereby guarantee not have big argon gas.After the vacuum-treat of VD stove, in molten steel, add insulating covering agent, and keep soft blow so that top of the slag fine motion, the time that soft blow keeps is 12 minutes to 30 minutes, then molten steel is carried out continuous casting.
In order further to improve efficiency of energy utilization, the 4th hole dedusting pre-heating system also capable of using reclaims fume afterheat, and enough improving the electric arc furnace dust removing effects, thereby the realization waste heat utilizes again.
The main purpose of bootstrap system is to make full use of fume afterheat, produces saturation steam, supplies with that the VD stove is produced or as other thermal source, thereby can reclaim electric arc furnace complementary energy substantially.
1200 ℃ of left and right sides high-temperature flue gas that electric arc furnace 201 produces are through moving water-cooled flue, vertical gas pass, horizontal flue; Get into combustion settling chamber 202; Combustiblematerialss such as CO carry out secondary combustion in combustion settling chamber 202, and make after the macrobead sedimentation, and temperature is reduced to about 800 ℃; Flue gas gets into heat pipe waste heat boiler 203 through high-temperature flue, and after heat exchange, flue-gas temperature drops to about 150 ℃, gets into fly-ash separator 204 through pipeline then and carries out purifying and dedusting, enters atmosphere through blower fan 205 at last.In heat pipe waste heat boiler 203, soft water is heated to (wherein soft water gets into waste heat boiler 203 by soft water station 210 through deoxygenator 211) about 200 ℃, produce saturation steam.The saturation steam that produces is sent into thermophore 206, is fed to VD stove 208 or is used as other thermal source 209 through sub-cylinder 207 then.
Through above-mentioned bootstrap system, when the production of VD stove needs steam, can use the saturation steam of supplying with by thermophore 206, also can the steam that holder 206 is supplied be used as other thermal source simultaneously.Recycle a large amount of electric arc furnace waste heats on the one hand, another side also can solve the problem of flue gas ash removal.
After the vacuum-treat of VD stove, can carry out continuous casting to the molten steel of gained and handle (105), produce various steel strand is rolled (106).In order to produce the zero defect strand; Actively push forward high-efficient continuous casting technology, also can in casting process, adopt ladle long nozzle and tundish submerged nozzle protection casting technique, large vol tundish technology, mold liquid level and secondary cooling water system automatic control technology, electromagnetic agitating technology, multi-point straightening technology, high frequency, little amplitude and non-sinusoidal Oscillation Technique of Mould, roller to be listed as reasonable fine and closely wovenization and many fulcrums metamerism roller technology etc.Real high yield, high quality, high reliability and the high benefit that realizes continuous caster.
Enforcement through a series of measures; Make continuous caster stable state pouring technology obtain tangible result, improve through continuous research, the stable state pouring technology that continuous caster is operating as the basis with " three perseverances " (permanent pulling rate, stationary temperature, constant level) has improved the cooperation consciousness of each operation of making steel; Guaranteed the stable smooth operation of producing; Guarantee strand hot-loading and hot-conveying rate, improved slab quality effectively, reduce ton steel production cost.
Illustrated and described exemplary embodiment of the present invention; Yet those skilled in the art should understand that; Under the situation that does not break away from the spirit and scope of the present invention, can carry out various modifications and change to embodiment, scope of the present invention limits in claims and equivalent thereof.
Claims (10)
1. arc furnace steelmaking process, this method may further comprise the steps:
Preparation raw material, by weight, said raw material comprises 30% to 70% molten iron, 5% to 20% high-quality steel scrap, 20% to 45% cheap steel scrap and other auxiliary material of 4% to 5%;
Utilize electric arc furnace that raw material is refined into molten steel, wherein,, reduce or interrupt power supply fully along with the molten iron amount of being blended into increases and the oxygen pressure rising.
2. arc furnace steelmaking process as claimed in claim 1; Also be included in and refine into after the molten steel; Utilize ladle refining furnace and vacuum degassing furnace that molten steel is carried out refining; Wherein, the ladle refining furnace smelting cycle is not less than 32 minutes/stove, and the compressed steel time between ladle refining furnace and the vacuum degassing furnace is no more than 15 minutes.
3. arc furnace steelmaking process as claimed in claim 2, wherein, the processing of before molten steel gets into vacuum degassing furnace, skimming, taking off the quantity of slag is 1/2 to 2/3 of the interior refining slag quantity of slag of ladle.
4. arc furnace steelmaking process as claimed in claim 2, wherein, in the vacuum-treat process of vacuum degassing furnace, argon flow amount is 150L/min to 280L/min, argon pressure is 0.2MPa to 0.3MPa.
5. arc furnace steelmaking process as claimed in claim 2 wherein, after the vacuum degassing furnace vacuum-treat, adds insulating covering agent, keeps soft blow so that top of the slag fine motion.
6. arc furnace steelmaking process as claimed in claim 5, wherein, the time of soft blow is 12 minutes to 30 minutes, then molten steel is carried out continuous casting.
7. arc furnace steelmaking process as claimed in claim 2, wherein, the saturation steam supply vacuum degassing furnace that utilizes the fume afterheat in the electric arc furnace to produce is produced required thermal source.
8. arc furnace steelmaking process as claimed in claim 1, wherein, molten clear carbon content is: soft steel >=0.30%; Medium carbon steel >=0.45%; High carbon steel >=0.60%.
9. arc furnace steelmaking process as claimed in claim 1, wherein, endpoint carbon content is: soft steel >=0.08%; Medium and high carbon steel >=0.15%.
10. arc furnace steelmaking process as claimed in claim 1, wherein, tapping temperature is: 1530 ℃ to 1580 ℃ in soft steel; 1520 ℃ to 1570 ℃ in medium carbon steel; 1510 ℃ to 1560 ℃ in high carbon steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105299666A CN101993972B (en) | 2010-11-03 | 2010-11-03 | Arc furnace steelmaking method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105299666A CN101993972B (en) | 2010-11-03 | 2010-11-03 | Arc furnace steelmaking method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101993972A CN101993972A (en) | 2011-03-30 |
| CN101993972B true CN101993972B (en) | 2012-12-19 |
Family
ID=43784721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105299666A Expired - Fee Related CN101993972B (en) | 2010-11-03 | 2010-11-03 | Arc furnace steelmaking method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101993972B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103834861A (en) * | 2014-03-20 | 2014-06-04 | 莱芜钢铁集团有限公司 | 320MPa low-temperature resistant hot-rolled H-shaped steel and preparation method thereof |
| CN103834860A (en) * | 2014-03-20 | 2014-06-04 | 莱芜钢铁集团有限公司 | 235MPa-level low temperature resisting hot-rolled H-shaped steel and preparation method thereof |
| CN104004881B (en) * | 2014-06-13 | 2015-09-23 | 常州东大中天钢铁研究院有限公司 | A kind of control method of producing nitrogen content in aluminium deoxidation high carbon steel process |
| CN115106497A (en) * | 2022-06-14 | 2022-09-27 | 河钢乐亭钢铁有限公司 | Method for controlling vibration mark defect of continuous casting slab |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101451175A (en) * | 2007-12-03 | 2009-06-10 | 舞阳钢铁有限责任公司 | Smelting method of high level detecting steel |
| CN101545066A (en) * | 2009-05-12 | 2009-09-30 | 攀钢集团成都钢铁有限责任公司 | Method for smelting H2S corrosion resistant petroleum casing pipe steel 110S |
| CN101660019A (en) * | 2009-09-28 | 2010-03-03 | 莱芜钢铁股份有限公司 | Electric furnace burden process with high efficiency and low cost |
-
2010
- 2010-11-03 CN CN2010105299666A patent/CN101993972B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101451175A (en) * | 2007-12-03 | 2009-06-10 | 舞阳钢铁有限责任公司 | Smelting method of high level detecting steel |
| CN101545066A (en) * | 2009-05-12 | 2009-09-30 | 攀钢集团成都钢铁有限责任公司 | Method for smelting H2S corrosion resistant petroleum casing pipe steel 110S |
| CN101660019A (en) * | 2009-09-28 | 2010-03-03 | 莱芜钢铁股份有限公司 | Electric furnace burden process with high efficiency and low cost |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101993972A (en) | 2011-03-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101403021B (en) | Utilization method for steel scoria | |
| CN111154943B (en) | Method for improving steel scrap ratio in long-flow steelmaking | |
| US20180363077A1 (en) | Production method for smelting clean steel from full-scrap steel using duplex electric arc furnaces | |
| CN100577822C (en) | Method for extracting vanadium and removing phosphorus from vanadium-containing molten iron and steel-smelting technique using the same method | |
| CN102676743A (en) | Step-by-step returning recycling method of LF (Lactoferrin) refining slag in thermal state | |
| CN112646944A (en) | Converter less-slag smelting method | |
| WO2018227836A1 (en) | Method for producing clean steel by means of electric arc furnace dual smelting of full scrap steel | |
| CN113493868B (en) | High scrap ratio converter smelting method based on molten reduced molten iron | |
| CN104178594B (en) | A kind of method of converter simply connected vanadium extraction steel-making | |
| CN110273047A (en) | A kind of hot casting residue returns the molten steel recovery method of ladle | |
| CN101993972B (en) | Arc furnace steelmaking method | |
| CN110628980A (en) | Smelting method for improving scrap steel ratio by preheating scrap steel in iron ladle through oxygen combustion gun | |
| CN109628697B (en) | High-carbon dephosphorization method for smelting medium-high carbon steel grade in converter | |
| CN102534093A (en) | Control method of two-stage auxiliary material module in revolving furnace smelting process | |
| CN101899548A (en) | Novel process for scrap steel preheating and premelting and high-efficiency electric furnace steel making | |
| CN104328243B (en) | Join carbon large power consumption control oxygen electrical furnace steelmaking process in right amount | |
| CN111154938B (en) | Smelting method for applying light and thin scrap steel in converter | |
| CN111748670B (en) | Method for improving chromium ore reduction by bottom blowing oxygen-lime powder | |
| CN114540568B (en) | Smelting method for improving scrap steel ratio | |
| CN1325672C (en) | Lead smelting method and apparatus implementing the same | |
| CN103031409B (en) | Novel process of steelmaking deoxidization by utilizing precipitator dust of refining furnace | |
| CN104404176A (en) | Recycling method of refining white slag | |
| CN103305639A (en) | Efficient recycling process of hot slag | |
| CN1706974A (en) | Vanadium extracting process | |
| CN220202006U (en) | Equipment for smelting reduction of copper-containing sludge based on oxygen-enriched top-blowing process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: JINAN IRON AND STEEL CO LTD Free format text: FORMER OWNER: LAIWU IRON CO., LTD. Effective date: 20120405 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 271104 Laiwu Steel Technology Center, Gangcheng District, Shandong, Laiwu, China Applicant after: Laiwu Iron & Steel Co.,Ltd. Address before: 271104, Xinxing Road, Gangcheng District, Shandong, Laiwu, 21 Applicant before: Laiwu Iron & Steel Co.,Ltd. |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 271104 LAIWU, SHANDONG PROVINCE TO: 250101 JINAN, SHANDONG PROVINCE |
|
| TA01 | Transfer of patent application right |
Effective date of registration: 20120405 Address after: 250101 Ji'nan Industrial Road, Shandong, No. 21 Applicant after: JINAN IRON AND STEEL Co.,Ltd. Address before: 271104 Laiwu Steel Technology Center, Gangcheng District, Shandong, Laiwu, China Applicant before: Laiwu Iron & Steel Co.,Ltd. |
|
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 250101 Ji'nan Industrial Road, Shandong, No. 21 Applicant after: SHANDONG IRON AND STEEL Co.,Ltd. Address before: 250101 Ji'nan Industrial Road, Shandong, No. 21 Applicant before: JINAN IRON AND STEEL Co.,Ltd. |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: JINAN IRON AND STEEL CO LTD TO: SHANDONG IRON + STEEL CO., LTD. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121219 Termination date: 20171103 |