CN107130148B - A kind of Novel aluminum alloy material and its manufacture craft - Google Patents

A kind of Novel aluminum alloy material and its manufacture craft Download PDF

Info

Publication number
CN107130148B
CN107130148B CN201710540340.7A CN201710540340A CN107130148B CN 107130148 B CN107130148 B CN 107130148B CN 201710540340 A CN201710540340 A CN 201710540340A CN 107130148 B CN107130148 B CN 107130148B
Authority
CN
China
Prior art keywords
parts
aluminum alloy
aluminium alloy
temperature
manufacture craft
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.)
Active
Application number
CN201710540340.7A
Other languages
Chinese (zh)
Other versions
CN107130148A (en
Inventor
武娟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Weile Aluminum Co., Ltd
Original Assignee
Hefei Wan Jing King Door And Window Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hefei Wan Jing King Door And Window Co Ltd filed Critical Hefei Wan Jing King Door And Window Co Ltd
Priority to CN201710540340.7A priority Critical patent/CN107130148B/en
Publication of CN107130148A publication Critical patent/CN107130148A/en
Application granted granted Critical
Publication of CN107130148B publication Critical patent/CN107130148B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/026Alloys based on aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/06Making alloys with the use of special agents for refining or deoxidising
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/003Alloys based on aluminium containing at least 2.6% of one or more of the elements: tin, lead, antimony, bismuth, cadmium, and titanium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon

Abstract

A kind of Novel aluminum alloy material and its manufacture craft, novel aluminum alloy include following component:Si, Cu, Ti, Mg, Cr, Ni, V, B, Fe, C, P, Al and compound rare-earth, manufacture craft are:A, smelting furnace is preheated, fine aluminium ingot is launched into stove, is heated to being completely melt, then Cu, Ni, Mg melting is added into molten aluminum and obtains aluminium alloy one;B, it is put into Si, Ti, Cr and V melting into aluminium alloy one, places into B, Fe, C, P and compound rare-earth, melting obtains aluminium alloy two;C, aluminium alloy two is kept the temperature, refining agent is added and is blown into inert gas;D, it is heat-treated, then carries out excision forming.The manufacture craft of the present invention can improve the mechanical property of aluminium alloy, further improve wear-resisting property.

Description

A kind of Novel aluminum alloy material and its manufacture craft
Technical field
The invention belongs to aluminum alloy materials technical fields, and in particular to a kind of Novel aluminum alloy material and its manufacture craft.
Background technology
Aluminium is pure white light metal, there is ductility, and rodlike, sheet, foil-like, powdery, band-like and Filamentous is often made in commodity. One layer of oxidation film for preventing metal erosion can be formed in humid air.Aluminium powder and aluminium foil heat fierce burning in air, concurrently Go out dazzling white flame.It is soluble in dilute sulfuric acid, nitric acid, hydrochloric acid, sodium hydroxide and potassium hydroxide solution, is insoluble in water.Aluminium exists Content in the earth's crust is only second to oxygen and silicon, occupies third position, is the metallic element that content is most abundant in the earth's crust.Aviation, building, automobile The development of three big important industries, it is desirable that material property has the peculiar property of aluminium and its alloy, this just greatly facilitates this new The production and application of metallic aluminium, the application of aluminium are extremely wide.
Aluminium alloy is most widely used one kind non-ferrous metal structural material in industry, in Aeronautics and Astronautics, automobile, machinery It has been widely applied in manufacture, ship and chemical industry, the rapid development of industrial economy, the demand day to Welded structural member Benefit increases, and the Research on Weldability enabled aluminum alloy to also stretches into therewith.Aluminium alloy density is low, but intensity is relatively high, approaches or even super High-quality steel is crossed, plasticity is good, can be processed into various proximate matters, and there is excellent electric conductivity, thermal conductivity and corrosion stability, industrial wide hair to make With usage amount is only second to steel.Some aluminium alloys may be used heat treatment and obtain good mechanical performance, physical property and anticorrosive Performance.The extensive use of aluminium alloy promotes the development of aluminum alloy solder technology, while aluminium has been expanded in the development of welding technique again The application field of alloy, therefore, the welding technique of aluminium alloy are just becoming one of the hot spot of research.
Aluminum alloy materials largely apply to building, civilian and industrial circle, and at present industrial high-strength aluminum alloy material Many different requirements, such as, it is desirable that there is high intensity, high tenacity and good machine-shaping property, highly corrosion resistant ability, have more Kind surface treatment properties or good heat treatment performance etc..Currently, quantity and model that high strength alumin ium alloy is used in industrial circle Enclose it is increasing, but, existing high-strength aluminum alloy material far can not meet the requirement of industrial circle.Existing high strength alumin ium alloy material Material only meets above-mentioned partial condition, cannot meet above-mentioned all conditions simultaneously, especially in machine-shaping, surface quality, Re Chu The aspect of performance such as reason cannot meet.This is influenced but also use of the high-strength aluminum alloy material in industrial circle receives limitation Usage amount of the high-strength aluminum alloy in industrial circle.To sum up, the aluminum alloy materials for applying to industrial circle generally require height Intensity, high tenacity, great surface quality and a variety of surface treatment capabilities, but due to this aluminium alloying degree height, exist and add Work difficult forming, heat treatment requirements are high, surface quality is poor, the painstaking difficult deficiency in surface.
In summary, it is therefore desirable to which a kind of more excellent aluminum alloy materials improve the deficiencies in the prior art.
Invention content
The object of the present invention is to provide a kind of Novel aluminum alloy material and its manufacture craft, aluminium alloy material prepared by the present invention Not only service life is long for material, but also intensity is high, and safety is good, also has very strong rub resistance and corrosion resistance, makes work Skill can not only reduce processing cost, shorten the process-cycle, and corrosion resistance and the welding performance etc. that can improve aluminium alloy, Improve the quality of product.
The present invention provides the following technical solutions:
A kind of Novel aluminum alloy material is made of the raw material of following parts by weight:Si:2-4 parts, Cu:3-5 parts, Ti:2-4 parts, Mg:3-5 parts, Cr:3-6 parts, Ni:4-6 parts, V:2-5 parts, B:3-5 parts, Fe:4-7 parts, C:4-8 parts, P:3-7 parts, Al:105- 126 parts and 5-10 parts of compound rare-earth.
Preferably, the raw material by following parts by weight forms:Si:4 parts, Cu:3 parts, Ti:4 parts, Mg:4 parts, Cr:6 parts, Ni:5 parts, V:4 parts, B:3 parts, Fe:5 parts, C:4 parts, P:7 parts, Al:118 parts and 8 parts of compound rare-earth.
Preferably, the compound rare-earth includes following component:Tm, Tb, Pr, Nd, Lu, Sm and Ho.
A kind of manufacture craft of Novel aluminum alloy material, includes the following steps:
A, smelting furnace is first preheated into 10-15min, fine aluminium ingot is launched into stove, 800-1000 DEG C is heated to, keeps fine aluminium ingot complete Running down, then Cu, Ni is added into molten aluminum and melts successively, 600-700 DEG C is then cooled the temperature to, Mg is added in smelting furnace Melting 20-30min obtains aluminium alloy one;
B, by smelting furnace temperature rise to 1200-1350 DEG C, then into aluminium alloy one it is put into Si, Ti, Cr and V successively, protected Warm melting 2-3h, then it is sequentially placed into B, Fe, C, P and compound rare-earth, it is warming up to 1400-1480 DEG C, melting 40-60min is closed Golden liquid two;
C, aluminium alloy two is kept the temperature at 800-900 DEG C, refining agent is added into aluminium alloy two, and be blown into inert gas progress Degasification slagging-off 20-30min;
D, the aluminium alloy two after degasification removing the gred imports in mold, is heat-treated after being cooled to room temperature, then cut Molding.
Preferably, the refining agent that the step c is added accounts for the 2-5% of two mass of aluminium alloy.
Preferably, the refining agent of the step c includes following component:LiCl, potassium carbonate, potassium fluoroaluminate, precipitated calcium carbonate And Na2SiF6
Preferably, the inert gas of the step c is argon gas or nitrogen.
Preferably, the heat treatment of the step d is:Alloy after cooling is heated to 400-450 DEG C, keeps the temperature 10- 15min is then heated to 480-520 DEG C, keeps the temperature 20-30min in its surface smear thickness in the powdered graphite of 0.3-0.7mm, Then room temperature is cooled to the speed of 10-15 DEG C/s with water cooling, then cleans surface.
The beneficial effects of the invention are as follows:
Not only service life is long for aluminum alloy materials prepared by the present invention, but also intensity is high, and safety is good, also has very strong Rub resistance and corrosion resistance, manufacture craft can not only reduce processing cost, shorten the process-cycle, and can improve aluminium conjunction The corrosion resistance of gold and welding performance etc., improve the quality of product.
The strontium element that the present invention adds is surface active element, and the plasticity that strontium element progress Metamorphism treatment can improve alloy adds Work and end product quality improve material mechanical performance and plastic processing, improve product surface roughness, and can reduce Primary silicon particle size improves plastic deformation ability.
Ni the and Cr elements that the present invention is added, chromium can significantly improve intensity, hardness and wearability, and chromium can improve aluminium alloy again Inoxidizability and corrosion resistance, nickel can improve the intensity of aluminium alloy, and good plasticity and toughness, nickel is kept to have soda acid Higher corrosion resistance, there is antirust and temperature capacity at high temperature.
The Cu elements that the present invention is added can increase the intensity and antioxygenic property of aluminium alloy, improve service life, addition Mg elements can improve its welding performance, increase its corrosion resistance and intensity.
The compound rare-earth that the present invention is added can crystal grain thinning during heat treatment effect, increase its structural strength, also Its corrosion resistance and frictional behaviour can be improved, its service life is improved, reduces cost.
Specific implementation mode
Embodiment 1
A kind of Novel aluminum alloy material is made of the raw material of following parts by weight:Si:4 parts, Cu:5 parts, Ti:2 parts, Mg:5 Part, Cr:6 parts, Ni:4 parts, V:2 parts, B:5 parts, Fe:4 parts, C:8 parts, P:3 parts, Al:105 parts and 10 parts of compound rare-earth.
Compound rare-earth includes following component:Tm, Tb, Pr, Nd, Lu, Sm and Ho.
A kind of manufacture craft of Novel aluminum alloy material, includes the following steps:
A, smelting furnace is first preheated into 15min, fine aluminium ingot is launched into stove, 1000 DEG C is heated to, fine aluminium ingot is made to be completely melt, Cu, Ni are added into molten aluminum again to melt successively, then cools the temperature to 600 DEG C, Mg is added to melting 30min in smelting furnace, Obtain aluminium alloy one;
B, by smelting furnace temperature rise to 1200 DEG C, then Si, Ti, Cr and V are put into aluminium alloy one successively, keep the temperature melting 2-3h, then it is sequentially placed into B, Fe, C, P and compound rare-earth, 1480 DEG C are warming up to, melting 60min obtains aluminium alloy two;
C, aluminium alloy two is kept the temperature at 900 DEG C, refining agent is added into aluminium alloy two, and be blown into inert gas and carry out degasification Remove the gred 20min;
D, the aluminium alloy two after degasification removing the gred imports in mold, is heat-treated after being cooled to room temperature, then cut Molding.
The refining agent that step c is added accounts for the 5% of two mass of aluminium alloy.
The refining agent of step c includes following component:LiCl, potassium carbonate, potassium fluoroaluminate, precipitated calcium carbonate and Na2SiF6
The inert gas of step c is nitrogen.
The heat treatment of step d is:Alloy after cooling is heated to 400 DEG C, 15min is kept the temperature, in its surface smear thickness In the powdered graphite of 0.7mm, 480 DEG C are then heated to, 30min is kept the temperature, room is then cooled to the speed of 10 DEG C/s with water cooling Temperature, then clean surface.
Embodiment 2
A kind of Novel aluminum alloy material is made of the raw material of following parts by weight:Si:4 parts, Cu:3 parts, Ti:4 parts, Mg:4 Part, Cr:6 parts, Ni:5 parts, V:4 parts, B:3 parts, Fe:5 parts, C:4 parts, P:7 parts, Al:118 parts and 8 parts of compound rare-earth.
Compound rare-earth includes following component:Tm, Tb, Pr, Nd, Lu, Sm and Ho.
A kind of manufacture craft of Novel aluminum alloy material, includes the following steps:
A, smelting furnace is first preheated into 10min, fine aluminium ingot is launched into stove, 1000 DEG C is heated to, fine aluminium ingot is made to be completely melt, Cu, Ni are added into molten aluminum again to melt successively, then cools the temperature to 600 DEG C, Mg is added to melting 30min in smelting furnace, Obtain aluminium alloy one;
B, by smelting furnace temperature rise to 1250 DEG C, then Si, Ti, Cr and V are put into aluminium alloy one successively, keep the temperature melting 2-3h, then it is sequentially placed into B, Fe, C, P and compound rare-earth, 1400 DEG C are warming up to, melting 40min obtains aluminium alloy two;
C, aluminium alloy two is kept the temperature at 900 DEG C, refining agent is added into aluminium alloy two, and be blown into inert gas and carry out degasification Remove the gred 20min;
D, the aluminium alloy two after degasification removing the gred imports in mold, is heat-treated after being cooled to room temperature, then cut Molding.
The refining agent that step c is added accounts for the 5% of two mass of aluminium alloy.
The refining agent of step c includes following component:LiCl, potassium carbonate, potassium fluoroaluminate, precipitated calcium carbonate and Na2SiF6
The inert gas of step c is argon gas.
The heat treatment of step d is:Alloy after cooling is heated to 450 DEG C, 15min is kept the temperature, in its surface smear thickness In the powdered graphite of 0.3mm, 520 DEG C are then heated to, 30min is kept the temperature, room is then cooled to the speed of 10 DEG C/s with water cooling Temperature, then clean surface.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, although with reference to aforementioned reality Applying example, invention is explained in detail, for those skilled in the art, still can be to aforementioned each implementation Technical solution recorded in example is modified or equivalent replacement of some of the technical features.All essences in the present invention With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.

Claims (8)

1. a kind of aluminum alloy materials, which is characterized in that be made of the raw material of following parts by weight:Si:2-4 parts, Cu:3-5 parts, Ti: 2-4 parts, Mg:3-5 parts, Cr:3-6 parts, Ni:4-6 parts, V:2-5 parts, B:3-5 parts, Fe:4-7 parts, C:4-8 parts, P:3-7 parts, Al: 105-126 parts and 5-10 parts of compound rare-earth.
2. a kind of aluminum alloy materials according to claim 1, which is characterized in that be made of the raw material of following parts by weight:Si: 4 parts, Cu:3 parts, Ti:4 parts, Mg:4 parts, Cr:6 parts, Ni:5 parts, V:4 parts, B:3 parts, Fe:5 parts, C:4 parts, P:7 parts, Al:118 8 parts of part and compound rare-earth.
3. a kind of aluminum alloy materials according to claim 1, which is characterized in that the compound rare-earth includes following component: Tm, Tb, Pr, Nd, Lu, Sm and Ho.
4. a kind of manufacture craft of aluminum alloy materials as described in any one of claims 1-3, which is characterized in that including following step Suddenly:
A, smelting furnace is first preheated into 10-15min, fine aluminium ingot is launched into stove, is heated to 800-1000 DEG C, keep fine aluminium ingot completely molten Change, then Cu, Ni is added into molten aluminum and melts successively, then cools the temperature to 600-700 DEG C, Mg is added to melting in smelting furnace 20-30min obtains aluminium alloy one;
B, by smelting furnace temperature rise to 1200-1350 DEG C, then Si, Ti, Cr and V are put into aluminium alloy one successively, heat preservation is molten 2-3h is refined, then is sequentially placed into B, Fe, C, P and compound rare-earth, is warming up to 1400-1480 DEG C, melting 40-60min obtains aluminium alloy Two;
C, aluminium alloy two is kept the temperature at 800-900 DEG C, refining agent is added into aluminium alloy two, and be blown into inert gas and carry out degasification Remove the gred 20-30min;
D, the aluminium alloy two after degasification removing the gred imports in mold, is heat-treated after being cooled to room temperature, then carry out excision forming .
5. a kind of manufacture craft of aluminum alloy materials according to claim 4, which is characterized in that the step c was added Refining agent accounts for the 2-5% of two mass of aluminium alloy.
6. a kind of manufacture craft of aluminum alloy materials according to claim 4, which is characterized in that the refining of the step c Agent includes following component:LiCl, potassium carbonate, potassium fluoroaluminate, precipitated calcium carbonate and Na2SiF6
7. a kind of manufacture craft of aluminum alloy materials according to claim 4, which is characterized in that the inertia of the step c Gas is argon gas or nitrogen.
8. a kind of manufacture craft of aluminum alloy materials according to claim 4, which is characterized in that at the heat of the step d Reason is:Alloy after cooling is heated to 400-450 DEG C, 10-15min is kept the temperature, in its surface smear thickness 0.3-0.7mm's Powdered graphite is then heated to 480-520 DEG C, keeps the temperature 20-30min, is then cooled to room with water cooling with the speed of 10-15 DEG C/s Temperature, then clean surface.
CN201710540340.7A 2017-07-05 2017-07-05 A kind of Novel aluminum alloy material and its manufacture craft Active CN107130148B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710540340.7A CN107130148B (en) 2017-07-05 2017-07-05 A kind of Novel aluminum alloy material and its manufacture craft

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710540340.7A CN107130148B (en) 2017-07-05 2017-07-05 A kind of Novel aluminum alloy material and its manufacture craft

Publications (2)

Publication Number Publication Date
CN107130148A CN107130148A (en) 2017-09-05
CN107130148B true CN107130148B (en) 2018-10-23

Family

ID=59736823

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710540340.7A Active CN107130148B (en) 2017-07-05 2017-07-05 A kind of Novel aluminum alloy material and its manufacture craft

Country Status (1)

Country Link
CN (1) CN107130148B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108588592A (en) * 2018-04-19 2018-09-28 宁波摩尔克斯灯杆技术有限公司 A kind of high-intensity aluminium garden lamp stand pedestal and its processing method

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104561707A (en) * 2015-02-10 2015-04-29 苏州市神龙门窗有限公司 High-corrosion-resistance aluminum alloy material and heat treatment technique thereof
CN104674087A (en) * 2015-03-20 2015-06-03 苏州科胜仓储物流设备有限公司 High-strength anticorrosion aluminum-alloy material and production process thereof
CN105369045B (en) * 2015-10-21 2018-06-08 广西平果铝合金精密铸件有限公司 A kind of aluminium alloy sodium-free refining agent containing rare earth
CN105385872B (en) * 2015-10-21 2018-06-08 广西平果铝合金精密铸件有限公司 A kind of aluminium alloy sodium-free refining agent
CN105420561B (en) * 2015-12-11 2018-03-27 天津爱田汽车部件有限公司 A kind of high strength die-casting aluminum alloy
CN105821255A (en) * 2016-05-03 2016-08-03 贵州航天风华精密设备有限公司 Abrasion-resistant aluminum alloy and production method thereof
CN106566935B (en) * 2016-10-17 2018-01-23 广州金邦液态模锻技术有限公司 A kind of liquid forging aluminium alloy and preparation method thereof

Also Published As

Publication number Publication date
CN107130148A (en) 2017-09-05

Similar Documents

Publication Publication Date Title
CN102943193B (en) Grain refinement machining process of hard aluminium alloy cast ingot
CN103667827B (en) A kind of preparation method of aluminum alloy plate materials
CN100439533C (en) Aluminium-silicon-copper-magnesium series deforming alloy and its preparing method
CN103710595B (en) A kind of rolling aluminum zinc alloy plate and preparation method thereof
CN104032195B (en) Efficiently-extrudable low-cost high-performance heat-conducting magnesium alloy and preparation method thereof
CN102965553A (en) Aluminum alloy cast ingot for automotive bumper and production process thereof
CN107779701A (en) A kind of 7XXX high strength weldable aluminiums containing Ag and Sc
CN107034372B (en) A kind of preparation method of High Strength Cast Aluminum Alloy
WO2013115593A1 (en) Machining magnesium alloy capable of being heat treated at high temperature
CN109022968A (en) A kind of processing method of door and window aluminium alloy
CN107130148B (en) A kind of Novel aluminum alloy material and its manufacture craft
CN102965554B (en) Hard aluminum alloy cast ingot
CN105420555A (en) Cast aluminum alloy capable of being anodized and preparation method thereof
CN105220042A (en) A kind of magnesium alloy and its preparation method and application
CN103103398B (en) A kind of smelting preparation method of resistant to rust aluminium alloy extrusions
CN104178672A (en) High-strength magnesium alloy and preparation method thereof
WO2019184294A1 (en) Method for preparing ferrochrome alloy
CN105177362A (en) High-strength composite aluminum alloy automobile part mixed with nano titanium carbide powder and casting technology of high-strength composite aluminum alloy automobile part
CN104911386A (en) Refinement method of aluminium alloy and refined aluminium alloy
CN103695745A (en) Boron nitride enhanced magnesium alloy and preparation method thereof
CN109161746A (en) A kind of high-strength corrosion-resisting door and window aluminium alloy and preparation method thereof
CN103820667A (en) Covering agent and aluminium-silicon alloy melt processing method
RU2334000C1 (en) Alloy on magnesium basis
CN103343289B (en) High-temperature wear-resistant cast steel and preparation method thereof
CN110684915B (en) High-strength magnesium alloy

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20191118

Address after: Baihuashan Industrial Zone, Baiyang street, Wuyi County, Jinhua City, Zhejiang Province

Patentee after: Zhejiang Weile Aluminum Co., Ltd

Address before: 230000, Anhui Hefei economic and Technological Development Zone Lianhua Road and Danxia road junction building 16 building 701 room

Patentee before: Hefei Wan Jing King door and window Co., Ltd.