CN100463998C - High-strength abrasion-proof thermostable nano alloyed steel material and producing method thereof - Google Patents
High-strength abrasion-proof thermostable nano alloyed steel material and producing method thereof Download PDFInfo
- Publication number
- CN100463998C CN100463998C CNB2006100460636A CN200610046063A CN100463998C CN 100463998 C CN100463998 C CN 100463998C CN B2006100460636 A CNB2006100460636 A CN B2006100460636A CN 200610046063 A CN200610046063 A CN 200610046063A CN 100463998 C CN100463998 C CN 100463998C
- Authority
- CN
- China
- Prior art keywords
- steel
- content
- alloy
- vanadium
- niobium
- 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
Abstract
The invention belongs to the producing field of alloyed steel materials, specially relates to an alloyed steel material with high wear-resistant and resistance to elevated temperatures, and its producing method. Nanomete alloyed steel produced by the method is characterized in that the granualarity of crystal grain of 80% in steel is less than 50 nm. The steel can satisfy each requirement of society for steel materials with excellent property.
Description
Technical field
This invention belongs to alloy steel material and manufactures the field, is specially a kind of high-strength abrasion-proof fire resistant alloy steel material and preparation method thereof.
Background technology
Along with science and technology and rapid development of economy, human society has entered a unprecedented new period.Industrial development and technical progress have proposed new requirement to traditional structural materials, the ferrous materials of particularly big, applied range to usage quantity, people's expectation utilizes minimum resource, minimum cost, manufacture out advanced ferrous materials, satisfy the special demands of social progress for material with this with very excellent over-all properties.
In recent years, the innovation in related discipline and field and progress, for the development of ferrous materials provides multiple supporting method and conditions such as equipment, automatization, computer, transmission, promote Iron And Steel Industry technology self that very big progress has been arranged, for example: molten steel is smelted pureization, steel billet production serialization, continuous rolling high speed or the like.Make the production of ferrous materials that suitable improvement arranged, steel product quality significantly improves.
People begin progressively to recognize the refined crystalline strengthening effect of microalloy element in steel from the sixties in 20th century, make the controlled rolling of steel and micro-alloying technology research begin to start to walk.70～eighties of 20th century with the support that is developed as of controlled chilling equipment, is the center with the refined crystalline strengthening, has carried out the research of controlled rolling and controlled cooling technology, and the effect of micro-alloying technology is performed to new level.Be developed as target with the ultralight car nineties in 20th century, utilizes means such as phase transformation strengthening, develops various types of high-strength steel that can satisfy different service requirementss, and the complex phaseization of steel has obtained people's generally attention.
In the later stage nineties 20th century, Japan, Korea S, China propose the Ultrafine Grained Steel evolutionary operation (EVOP) in succession, and significant more status is mentioned in the effect of grain refining.The state-run research institution that Japan official supports has carried out the fundamental research of grain refining, inquires into the limit of grain refining; A lot of enterprises then utilize the thought of grain refining, carry out different grades, satisfy the exploitation of the concrete material of different performance requirement, have developed the fine-grained steel of technical scale different performance and purposes etc.Korea S is representative with POSCO, has carried out exploitation high-strength, corrosion-resistant, welding ferrous materials of new generation, and has explored the approach of industrial application.China will have started national great fundamental research planned project " the great fundamental research of ferrous materials of new generation " the end of the year 1998, under the thought guidance of " strive for that ferrous materials homogenizes, pureization, grain refining ", 400,800, item research such as 1500MPa level super-steel makes substantial progress, and take the lead in having carried out in the world suitability for industrialized production and application, cause international attention, indicate that the research of China ferrous materials stepped into a new stage.
Meanwhile, application corresponding research has also been carried out in Europe.1999, European Coal steel alliance (ECSC) established the Ultrafine Grained Steel feasibility study project in 1 year by a definite date, had started the research project of " utilizing the innovation deformation process to make ultra-fine grain steel " by name subsequently again in calendar year 2001.The purpose of this project is the deformation process of research steel, is making the ferrous materials of new generation that has good mechanics and use properties, has good response in following process on the technical scale.This project comprises four working cells, relates separately to several important ferrous materials such as surperficial ultra-fine crystalline substance, low-carbon superfine crystalline substance, middle carbon ultrafine crystalline substance, high carbon ultrafine crystalline substance.This project makes substantial progress at present.
The material grain refining is significant for the exploitation of new ferrous materials, therefore the thought of grain refining further need be implemented in the research of all kinds of high-strength steel, to promote the development of grain refining technology.Kawasaki, Japan system iron has been developed grain refining " super HSLA steel ", and strength grade is respectively 590, the 780MPa level.This steel utilizes means such as low-temperature heat and interpolation microalloy element Ti, dynamic recrystallization by the low-temperature and high-speed finish rolling stage, refine austenite crystal grain, make ferrite crystal grain refine to about 2 μ m by 6～7 original μ m, the material of exploitation has good curring and shaping die and extension property, suitability for industrialized production concurrently.
The application of microalloy element can be strengthened controlled rolling and controlled cooling The Application of Technology effect greatly.In the exploitation of ferrous materials of new generation,, can promote the raising of material property greatly if can make full use of the favourable influence of microalloying to the controlled rolling and controlled cooling technology.Wherein metal niobium Nb is most important microalloy element, and it can suppress recrystallization process, improves the recrystallization temperature of material, is the important means of carrying out grain refining for a long time.For example in the exploitation of grain refining dual phase steel, adopt 0.103% Nb, can make material be in the non-recrystallization district in the rear portion of hot-rolling finishing mill group frame, the strain accumulation of rolling deformation makes the rolled piece after the finish rolling be in hardening state.The austenite of this hardening state, by stepless control suitable on runoff table cooling, the grain-size of refinement steel that not only can be by a relatively large margin, and simplified operation greatly, reduced the production difficulty of steel.The tissue that the martensite that adopts the new grade of steel of this technological development to have to be distributed by ultra-fine ferrite (2～3 μ m) and disperse is formed, high tensile strength (650～800MPa) and the use properties of unit elongation (20%～25%) and excellence.
For ferrous materials, pursue that it is wear-resistant, the long lifetime also is unusual important index.Grain refining will inevitably increase substantially these characteristics of steel.On present level, how further to realize the further refinement of steel crystal grain, enter into below the μ m level, even reach below 100 nanometers, thereby obtain the more superior performance of ferrous materials.New striving direction of metallargist and unremitting pursue have been become.
Summary of the invention
The specific purposes of this invention are exactly to utilize grain size number that alloying element can the effective restraint steel principle of growing up, grope effective alloy ingredient of ferrous materials and suitable manufacture craft, manufacture out the more superior high-strength wearable superfine crystal particle steel alloy of performance.Satisfy the urgent need of domestic and international market with this, advance the metallurgy industry technical progress.
According to aforementioned very sophisticated experience, the adding of metal niobium among the molten steel (Nb), can obviously play the crystallization refining effect of steel, with the exception of this, the inventor has also selected tungsten (W), molybdenum (Mo), vanadium elements such as (V), alloying element as steel-making joins among the molten steel, and final production has gone out the ideal superfine crystal particle and reached nano level alloy steel material, makes that purpose of the present invention is satisfied.
This invention obtains alloy steel products part such as following table 1 is listed:
Table 1
| Element term | Tungsten (W) | Manganese (Mn) | Vanadium (V) | Niobium (Nb) | Molybdenum (Mo) | Carbon (C) | Chromium (Cr) | Other elements | Iron Fe |
| Weight % | 0.0-6.0 | 0.6-3.0 | 0.0-6.0 | 0.2-4.0 | 0.0-7.0 | 0.5-4.0 | 1.0-8.0 | 0.1-3.0 | All the other |
In the listed high-strength abrasion-proof thermostable nano alloyed steel of table 1 (hereinafter to be referred as nano alloyed steel) composition, part plays the element of grain refining effect such as tungsten, vanadium, molybdenum etc. and also can not add when once smelting sometimes, and the performance of the steel alloy that obtains is basic identical.Therefore, when certain element was not added into, the following of this kind element value was limited to 0.0 in table.Also have, total add-on of nano alloyed steel interalloy elemental tungsten, manganese, vanadium, niobium, molybdenum, carbon, chromium is no more than nano alloyed steel gross weight 20%; Other elements in the table 1 refer to the micro-inclusion element that may exist in the steel, and as silicon (Si), aluminium (Al), calcium (Ca) etc., all the other compositions are iron (Fe) element.
This invention is produced nano alloyed steel according to smelting process.Employed main equipment is a vacuum induction furnace.Technical process mainly comprises the raw material preparation, goes into three process such as stove smelting, casting.The particular content of per pass operation comprises:
Raw material is prepared.The alloy listed according to table 1 is ready to raw material with every composition, and wherein each element is a raw material with the iron alloy of this kind element substantially, and as ferro-tungsten, ferro-vanadium, ferro-molybdenum etc., ferro element is advisable to adopt the pig iron or straight carbon steel; Because various alloy ingredients almost do not have scaling loss in the fusing smelting process, therefore, according to the target composition of certain alloying element of smelting nano alloyed steel, be converted into this kind alloying element and both can when preparing raw material in the content adding of raw materials used respective element iron alloy.For example, smelt the nano alloyed steel of a certain lot number, ultimate demand double centner tungsten.When the ferro-tungsten of getting tungstenic 50% was made raw material, the requirement of ferro-tungsten was 200 kilograms.
Going into stove smelts.Ready raw material is joined in the vacuum induction furnace, sealed stove, vacuumize, when furnace pressure drops to 760mmHg, charge into argon gas, the beginning heat temperature raising to 500mmHg, when temperature of fusion reaches 1620-1750 ℃, feed stock for blast furnace all melt and uniform ingredients after, smelt tapping.
The ingot casting moulding.Molten steel is poured in the previously prepd steel teeming ladle (ladle), more as required, molten steel is injected in the previously prepd mould cast molding.
The nano alloyed steel that this invention is produced utilizes scanning electron microscope, transmission electron microscope, X-ray diffractometer equipment to detect through units such as Central South University, Changsha Mining ﹠ Metallurgy Inst, Northeastern University and metal institutes of the Chinese Academy of Sciences, 80% crystallite size is arranged less than 50 nanometers (nm) in the steel alloy, wherein test center of Northeastern University utilizes transmission electron microscope that sample has been carried out the multi-angle monitoring, and the crystal grain median size in the sample is the 20-30 nanometer.So the alloy steel material that the present invention creation is made can be called real nano alloyed steel.
Analyze the reason of this steel grade grain ultrafining, be because this steel grade belongs to the two-phase highly dispersed, its particle is surrounded each other, is separated, form one ultramicron, the ultramicron of a phase can't be crossed among the ultramicron that enters another phase, thereby has avoided aggregation of particles and grain growth, so the ultramicron size is more stable, and, dwindled the space of dissolving in of other atom owing to its volume effect.Simultaneously the excess interface atom that is in noncrystalline state has hindered the diffusion displacement of solid-state heat-processed interalloy atoms of elements and iron atom, so heat up, cooling do not undergo phase transition, quenching does not have martensitic transformation yet, so it has very high thermostability.For example, on producing, tried out on the monodentate roller of sinter machine, although the load temperature of monodentate roller more than 800 ℃, but result of use is quite good.The nano alloyed steel that the contriver provides detects through metallographic behind heat treatment test repeatedly, and this nanocrystalline body steel alloy does not have phase transformation.
Because the volume effect of ultramicron, along with the diameter minimizing of nanoparticle, the energy level gap increases, the electron migration difficulty, and resistivity increases, thus erosion resistance increases.
In a word, it is good that this nano alloyed steel has high strength, high rigidity, high-temperature heat-resistance stability, solidity to corrosion, and high diffusive and size of particles good stability have good toughness simultaneously.These excellent comprehensive performances make in the past, and the performance of steel alloy has obtained extraordinary breakthrough.
After testing, ferrite content is up to 80-90% in this alloy, and double carbide only accounts for 10-20%, and its intensity but is improved greatly, and its hardness HRC reaches 55-65; Compare with the material with same rigidity, the toughness of this alloy also is greatly improved, and rapid heat cycle does not all ftracture, have malleable, good hot workability such as can weld, therefore have application prospect widely, specifically comprise:
(1) can be rolled into sheet material, bar and wire rod, use thereby carry out selection according to the load request of different engineering machinery, because of it is wear-resisting, heat-resisting, high-strength, good toughness can significantly improve work-ing life of member.
(2) smelt and precision casting according to the method that this invention provided, be processed into various spare and accessory parts and mould etc., both can satisfy the requirement of complicated moulding, can make the casting material have good comprehensive performances again, thereby can economize on resources to greatest extent.
(3) because the red hardness of this nano alloyed steel is higher than common rapid steel, and need not to heat-treat, thereby might replace the rapid steel use.
(4) its hardness height of this steel alloy, therefore splitting resistance is good, can replace the wear resistance electrode of high price import to carry out built-up welding, repairs metallurgical, mine main equipment, even can substitute about 300,000 yuan/ton the Lai Lite alloy use.
(5) the inserted drill hardness height that uses at present, but fragility is bigger, when the drilling quartzite, occurs collapsing broken breakage mostly, consumes bigger.Its hardness of this steel alloy can reach about HRC65, is the inserted drill of 8 times of this alloy near with the nano alloyed steel alternative cost, can save mining cost greatly and reduce the drill bit resource consumption.
(6) can be used to replace the die steel of import at high price.
(7) can be used on wear-resisting, the anti-corrosion and heat-stable parts of petrochemical industry.Such as inwall of fission reaction pipe etc.
(8) mode that adopts composite casting at the wear-resisting position of large-scale metallurgical equipment, can be improved the wear resistance problem of metallurgical equipment with the casting of this nano alloyed steel or built-up welding greatly, obtains satisfied effect, and is expected to solve the durability issues of large-scale roller.
(9) this steel alloy can show remarkable more performance aspect military project, stealth aircraft shell, tank armor and crawler belt, transmitting tube, submarine shell etc., all have and can utilize this nano alloyed steel to make, consequent economic benefit and social benefit can't be estimated;
(10) at aerospace field, this steel alloy can be used for the many aspects of aircraft.
Embodiment
Embodiment 1
Through smelting, the composition of No. 1 nano alloyed steel that is obtained is:
| Element term | Tungsten (W) | Manganese (Mn) | Vanadium (V) | Niobium (Nb) | Molybdenum (Mo) | Carbon (C) | Chromium (Cr) | Other elements | Iron Fe |
| Weight % | 4.5 | 0.8 | 3.2 | 0.8 | 4.6 | 0.8 | 2.5 | 3.0 | All the other |
Through smelting, the composition of No. 2 nano alloyed steels that obtained is:
| Element term | Tungsten (W) | Manganese (Mn) | Vanadium (V) | Niobium (Nb) | Molybdenum (Mo) | Carbon (C) | Chromium (Cr) | Other elements | Iron Fe |
| Weight % | 0.0 | 1.0 | 2.8 | 1.0 | 6.2 | 1.0 | 2.8 | 2.5 | All the other |
When smelting No. 1 above-mentioned nano alloyed steel, taked following processing method.
(1). raw material is prepared.Make raw material according to following proportioning, amount to 1000 kilograms.
Use the wolfram varbide of tungstenic 93%: 96.8 kilograms
Contain 99% electrolytic manganese: 16.2 kilograms
Use 50% ferro-vanadium: 128 kilograms
The niobium powder that contains niobium 65%: 24.6 kilograms
Use 60% ferro-molybdenum: 153.4 kilograms
Use 60% ferrochrome: 83.4 kilograms
Cast iron: 1500 kilograms
(2). go into stove and smelt.Ready raw material is joined in the vacuum induction furnace.Seal stove, vacuumized, charged into argon gas when furnace pressure drops to behind the 760mmHg and reach 500mmHg, begun to be heated to 1680 ℃ of degree.
(3). by the time after whole fusings of raw material and the uniform ingredients, molten steel is poured in the previously prepd ladle into casting.
Through check, the relevant index of No. 1 nano alloyed steel material of acquisition is:
Crystallite size: mean particle size 20.6mn
Hardness: 55-65HRC
Ultimate compression strength: 3900-4100Mpa
Claims (3)
1. high-strength abrasion-proof fire resistant alloy steel material, this kind steel alloy contains niobium, vanadium and W elements, it is characterized in that the steel alloy composition by weight percentage ratio be: the micro-inclusion constituent content 0.0-3.0% of other that may exist in W content 0.0-6.0%, manganese content 0.6-3.0%, content of vanadium 2.0-6.0%, content of niobium 0.2-4.0%, molybdenum content 2.0-7.0%, carbon content 0.5-4.0%, chromium content 1.0-8.0%, the steel, all the other compositions are iron, 80% crystallite size are arranged less than 50 nanometers in the steel alloy.
2. according to the described a kind of high-strength abrasion-proof fire resistant alloy steel material of claim 1, the gross weight that it is characterized by steel alloy interalloy elemental tungsten, manganese, vanadium, niobium, molybdenum, carbon and chromium is no more than steel alloy gross weight 20%.
3. preparation method according to the described alloy steel material of claim 1, this kind method comprises that mainly raw material is prepared, smelting is tapped, the casting operation, it is characterized in that in the method with the vacuum induction furnace being major equipment, raw material vacuumizes after packing into, when furnace pressure drops to 760mmHg, charge into argon gas to 500mmHg, begin heating and melt smelting, smelting temperature is 1620-1750 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100460636A CN100463998C (en) | 2006-03-16 | 2006-03-16 | High-strength abrasion-proof thermostable nano alloyed steel material and producing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100460636A CN100463998C (en) | 2006-03-16 | 2006-03-16 | High-strength abrasion-proof thermostable nano alloyed steel material and producing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101037759A CN101037759A (en) | 2007-09-19 |
| CN100463998C true CN100463998C (en) | 2009-02-25 |
Family
ID=38888930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100460636A Expired - Fee Related CN100463998C (en) | 2006-03-16 | 2006-03-16 | High-strength abrasion-proof thermostable nano alloyed steel material and producing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100463998C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102876986A (en) * | 2012-10-24 | 2013-01-16 | 章磊 | High-strength corrosion-resistance stainless steel and manufacturing method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55141550A (en) * | 1979-04-19 | 1980-11-05 | Daido Steel Co Ltd | Structural steel with low anisotropy of mechanical properties and superior machinability, and its manufacture by continuous casting |
| JPS565957A (en) * | 1979-06-28 | 1981-01-22 | Daido Steel Co Ltd | Cold working tool steel |
| JPH0726175B2 (en) * | 1986-03-12 | 1995-03-22 | 大同特殊鋼株式会社 | Method for manufacturing high speed tool steel |
| JP2006016639A (en) * | 2004-06-30 | 2006-01-19 | Kobe Steel Ltd | High cleanliness steel superior in fatigue strength or cold workability |
-
2006
- 2006-03-16 CN CNB2006100460636A patent/CN100463998C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55141550A (en) * | 1979-04-19 | 1980-11-05 | Daido Steel Co Ltd | Structural steel with low anisotropy of mechanical properties and superior machinability, and its manufacture by continuous casting |
| JPS565957A (en) * | 1979-06-28 | 1981-01-22 | Daido Steel Co Ltd | Cold working tool steel |
| JPH0726175B2 (en) * | 1986-03-12 | 1995-03-22 | 大同特殊鋼株式会社 | Method for manufacturing high speed tool steel |
| JP2006016639A (en) * | 2004-06-30 | 2006-01-19 | Kobe Steel Ltd | High cleanliness steel superior in fatigue strength or cold workability |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101037759A (en) | 2007-09-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112877606B (en) | Ultrahigh-strength full-austenite low-density steel and preparation method thereof | |
| CN101481780B (en) | Easy-to-weld superfine austenite crystal steel with superhigh intensity and high tenacity and manufacturing method thereof | |
| CN103882297B (en) | There is excellent toughness 390MPa grade low-temp ship steel and manufacture method thereof | |
| CN101596553B (en) | High speed steel roll collar applied to high speed wire rolling mill and manufacture method thereof | |
| CN101733580B (en) | 800MPa-grade high-strength high-tenacity gas shielded welding wire | |
| CN100478478C (en) | As-cast state high-carbon high-chromium cast iron and method for producing the same | |
| CN110846586B (en) | Steel for high-strength high-toughness high-wear-resistance steel ball and preparation method thereof | |
| CN101654761A (en) | Carbon-manganese composite microalloyed steel for engineering machinery and preparation method thereof | |
| CN105200337A (en) | High-strength abrasion-resisting steel plate and production method thereof | |
| CN111101065B (en) | High-strength corrosion-resistant high-temperature-resistant welding wire steel and production method thereof | |
| CN103981446B (en) | A kind of bainite type 700MPa level Twisted Steel and production method thereof | |
| CN102251184A (en) | Fe-Cr-B antifriction alloy containing aluminum and preparation method thereof | |
| CN109234635A (en) | A kind of 345MPa grades of low yield ratio weathering resistant steel and preparation method thereof | |
| CN109321846B (en) | Steel plate for large heat input welding with yield strength of 355MPa and preparation method thereof | |
| CN102181802A (en) | Preparation method of easy welding high strength toughness X80 pipe line steel for magnesium treatment | |
| CN106435384A (en) | Vanadium-containing automobile structural steel and production method thereof | |
| CN102534356A (en) | Wear-resistant white cast iron material and preparation method thereof | |
| CN108588557A (en) | A kind of micro-alloyed hot-rolled strips of low-carbon V-N-Nb and preparation method thereof | |
| CN105506442A (en) | Si-Mn alloying grinding ball iron grinding balls and preparation method thereof | |
| CN103667921B (en) | The uniform high-strong toughness Plate Steel of through-thickness performance and production method thereof | |
| CN111500920A (en) | HRB600 high-strength anti-seismic deformed steel bar and production method thereof | |
| CN104988388B (en) | Economical L485Q seamless pipeline pipe and preparation method thereof | |
| CN103114248B (en) | Steel for drilling tools and method for smelting steel for drilling tools | |
| CN105256238B (en) | A kind of preparation method of auto parts low-carbon martensite non-hardened and tempered steel | |
| CN100463998C (en) | High-strength abrasion-proof thermostable nano alloyed steel material and producing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: METALLURGY TECHNOLOGY RESEARCH INSTITUTE CO., LTD. Free format text: FORMER NAME: INST OF METALLURGICAL TECHNOLOGY, DONGBEI UNIV, SHENYANG |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 110004 Heping Road, Heping District, Liaoning, Shenyang, Lane No. 11, No. 3 Patentee after: Metallurgy Technology Research Institute Co., Ltd., Northeast University Address before: 110004 Heping Road, Heping District, Liaoning, Shenyang, Lane No. 11, No. 3 Patentee before: Inst of Metallurgical Technology, Dongbei Univ, Shenyang |
|
| C56 | Change in the name or address of the patentee |
Owner name: NORTHEASTEM UNIVERSITY METALLURGICAL TECHNOLOGY IN Free format text: FORMER NAME: METALLURGY TECHNOLOGY RESEARCH INSTITUTE CO., LTD., NORTHEAST UNIVERSITY |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 110004 Heping Road, Heping District, Liaoning, Shenyang, Lane No. 11, No. 3 Patentee after: NORTHEASTERN UNIVERSITY METALURGICAL TECHNOLOGY INSTITUTE CO., LTD. Address before: 110004 Heping Road, Heping District, Liaoning, Shenyang, Lane No. 11, No. 3 Patentee before: Metallurgy Technology Research Institute Co., Ltd., Northeast University |
|
| 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: 20090225 Termination date: 20160316 |