CN107254599A - Iron-copper material with low magnetic high conductivity characteristic and preparation method thereof - Google Patents
Iron-copper material with low magnetic high conductivity characteristic and preparation method thereof Download PDFInfo
- Publication number
- CN107254599A CN107254599A CN201710618046.3A CN201710618046A CN107254599A CN 107254599 A CN107254599 A CN 107254599A CN 201710618046 A CN201710618046 A CN 201710618046A CN 107254599 A CN107254599 A CN 107254599A
- Authority
- CN
- China
- Prior art keywords
- copper
- iron
- stove
- copper material
- high conductivity
- 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.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
Abstract
The invention provides a kind of iron-copper material with low magnetic high conductivity characteristic and preparation method thereof.Iron-copper material is that magnetic conduction is conductive, including：Copper, iron, silicon, aluminium, manganese, p and ses, the percentage by weight of each composition is：Copper 80wt.%, iron 18.45wt.%, carbon ＜ 0.15wt.%, silicon 0.35wt.%, aluminium 0.3wt.%, manganese 0.7wt.%, phosphorus 0.05wt.%, sulphur ＜ 0.025wt.%.Ingot iron and cathode copper of the iron-copper material of the present invention to be commonly used in producing, using sand casting process, prepare generator end shielding construction part iron-copper material as Main elements, Fe Cu alloys have into low magnetic conductivity, it is simple in construction the features such as." supporting magnetic " effect containing copper shield and " poly- magnetic " effect of magnetic screen, are greatly enhanced than the shield effectiveness only with single copper shield or magnetic screen simultaneously, also reduce end while using copper shield and the complexity of magnet shielding structure.
Description
Technical field
The present invention relates to electrical material technical field, more particularly to a kind of iron-copper with low magnetic high conductivity characteristic
Material and preparation method thereof.
Background technology
Generator end stray field, as stray magnetic fields, is to cause generator end area side end unshakable in one's determination and each structural member hair
Heat, produces destructive electromagnetic force and causes the root of mechanical oscillation.When generator is normally run, brow leakage is same always will be along magnetic
The minimum path of resistance passes through, therefore, and the coupling of stator and leakage-flux of rotor is concentrated mainly on the trim ring inner circle of stator, and pressure refers to and held
At portion's most side end core tooth, cause these position added losses increases, temperature rise.
Added losses are mainly leakage magnetic flux eddy-current loss caused by metal material, in order to reduce from axially into stator
Unshakable in one's determination leakage magnetic flux and prevent magnetic flux from, in edge core tooth part undue concentration, typically taking the mode of " supporting magnetic " or " poly- magnetic "
Suppress leakage magnetic flux.For large turbo-type generator, generally using copper coin as electrical shielding, or it is washed into using silicon steel sheet anodontia
Fanning strip builds up taper as magnetic shunt path.
And for the generator of higher capacity, then need that the shielding mode of electrical shielding and magnetic screen combination is installed simultaneously to subtract
The axial leakage magnetic flux in the end of small generators, the mounting means is complicated, adds the complexity of generator end structure, therefore
How shield effectiveness is ensured, while reducing the complexity of end construction turns into a urgent problem to be solved.
The content of the invention
The embodiment provides a kind of iron-copper material with low magnetic high conductivity characteristic and its preparation side
Method, to realize the shield effectiveness for effectively ensureing generator end.
According to an aspect of the invention, there is provided a kind of iron-copper material with low magnetic high conductivity characteristic, bag
Include：Copper, iron, silicon, aluminium, manganese, p and ses, the percentage by weight of the copper is 80%, and the iron-copper material magnetic conduction is conductive, and
And the electrical conductivity of the iron-copper material is 0.04572 Ω mm2/m。
Further, the percentage by weight of each composition is：Copper 80wt.%, iron 18.45wt.%, carbon ＜ 0.15wt.%,
Silicon 0.35wt.%, aluminium 0.3wt.%, manganese 0.7wt.%, phosphorus 0.05wt.%, sulphur ＜ 0.025wt.%.
Further, the copper is cathode copper, comprising 99.95%Cu, and the iron is pure iron or A3 steel, includes 99.6%
Fe, the silicon is ferrosilicon, comprising Si75%, and the manganese is ferromanganese, comprising Mn65%, and the phosphorus is phosphor-copper.
There is provided a kind of described iron-copper with low magnetic high conductivity characteristic according to another aspect of the present invention
The preparation method of material, including：
I. Medium frequency induction stove heat is used, furnace lining selects acid lining, first toward adding ingot iron by several times in stove and be heated to
1600 DEG C or so；
J. after after ingot iron fusing, scaling powder or glass are first added into the stove, the manganese of rear addition 0.6%
Iron is so as to deoxidation；
K. after after the manganese-ferro deoxidation, adding copper by several times into the stove, keep the in-furnace temperature constant, first three time adds
Enter the ratio of copper and 1/3rd of copper is added for after, the time interval that first three time adds copper is three minutes, and with stirring；With
Each equal proportion is toward adding copper in the stove afterwards, and is stirred, and makes copper and iron uniform doping；
L. add after copper material, phosphor-copper is added into the stove and carries out deoxidation, is added after phosphor-copper, again toward addition in the stove
Manganese-ferro deoxidation；
M. after manganese addition iron, a few minutes are spent toward adding ferrosilicon in the stove；Face before casting, aluminium is added into aluminium alloy；
N. temperature, to 1700 DEG C, beats surface scum in net stove in rise stove
O. alloy cast uses resin sand mould moulding, in cast, casting ladle first is preheating into 1200 DEG C or so, is subsequently poured into
Alloy melt, pouring temperature is 1550-1600 DEG C, should be stirred during cast alloy；
P. when alloy body is come out of the stove, blower fan is driven with motor, the conductive alloy body surface of magnetic conduction is brushed；
Temperature in stove is raised, to 800 DEG C, to be incubated 6 hours, with furnace temperature natural cooling, obtain with low magnetic high conductivity characteristic
Iron-copper material iron-copper material.
Further, described iron-copper material is used for generator end shielding construction.
The embodiment of the present invention is used for generator end it can be seen from the technical scheme that embodiments of the invention described above are provided
The iron-copper material of portion's shielding construction is using ingot iron and cathode copper conventional in producing as Main elements, using sand casting
Method, prepares generator end shielding construction part iron-copper material, and Fe-Cu alloys have into low magnetic conductivity, simple in construction etc.
Feature." support magnetic " effect containing copper shield and " poly- magnetic " effect of magnetic screen simultaneously, than only with single copper shield or
The shield effectiveness of magnetic screen is greatly enhanced, and also reduces end while using copper shield and the complexity of magnet shielding structure.
The additional aspect of the present invention and advantage will be set forth in part in the description, and these will become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, being used required in being described below to embodiment
Accompanying drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this
For the those of ordinary skill of field, without having to pay creative labor, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is a kind of iron-copper casting schematic diagram provided in an embodiment of the present invention；
Fig. 2 is a kind of iron-copper magnetization curve schematic diagram provided in an embodiment of the present invention；
Fig. 3 is a kind of copper-iron alloy organization chart provided in an embodiment of the present invention.
Embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element or element with same or like function are represented to same or similar label eventually.Below by ginseng
The embodiment for examining accompanying drawing description is exemplary, is only used for explaining the present invention, and is not construed as limiting the claims.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singulative " one " used herein, " one
It is individual ", " described " and "the" may also comprise plural form.It is to be further understood that what is used in the specification of the present invention arranges
Diction " comprising " refer to there is the feature, integer, step, operation, element and/or component, but it is not excluded that in the presence of or addition
Other one or more features, integer, step, operation, element, component and/or their group.It should be understood that when we claim member
Part is " connected " or during " coupled " to another element, and it can be directly connected or coupled to other elements, or can also exist
Intermediary element.In addition, " connection " used herein or " coupling " can include wireless connection or coupling.Wording used herein
"and/or" includes one or more associated any cells for listing item and all combined.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific terminology) with the general understanding identical meaning with the those of ordinary skill in art of the present invention.Should also
Understand, those terms defined in such as general dictionary, which should be understood that, to be had and the meaning in the context of prior art
The consistent meaning of justice, and unless defined as here, will not be explained with idealization or excessively formal implication.
For ease of the understanding to the embodiment of the present invention, done below in conjunction with accompanying drawing by taking several specific embodiments as an example further
Explanation, and each embodiment does not constitute the restriction to the embodiment of the present invention.
The embodiment of the present invention seeks the iron-copper material for meeting electromagnetic performance requirement, it is proposed that one kind is used for generator end
Iron-copper material with low magnetic high conductivity characteristic of portion's shielding construction and preparation method thereof, the embodiment of the present invention gives
Raw material selection, composition design and the manufacturing process of the iron-copper material, utilize the metallographic of laboratory facilities observation analysis alloy
Tissue and fracture apperance, analyze element proportioning, influence of the heat treatment to alloy material electromagnetic performance.
The iron-copper material with low magnetic high conductivity characteristic that the embodiment of the present invention is proposed leads in terms of raw material selection
Main elements are overregulated, micro- proportioning forms the low magnetic conduction iron-copper material that amount containing Cu is 80%.
The iron-copper composition is：Copper (Cu) 80wt.%, pure iron or A3 steel (99.6%Fe) 18.45wt.%, carbon (C)
＜ 0.15wt.%, silicon (Si) 0.35wt.%, aluminium (Al) 0.3wt.%, manganese (Mn) 0.7wt.%, phosphorus (P) 0.05wt.%, sulphur
(S) ＜ 0.025wt.%.
Raw material is selected：The copper is cathode copper, comprising 99.95%Cu, and the iron is pure iron or A3 steel, includes 99.6%
Fe, the silicon is ferrosilicon, comprising Si75%, and the manganese is ferromanganese, comprising Mn65%, and the phosphorus is phosphor-copper, and above-mentioned aluminium is aluminium flake.
The electrical conductivity of the iron-copper material is 0.04572 Ω mm2/m, and its magnetic property is low magnetic conductivity.It is above-mentioned
Wt% represents weight percent.
The preparation method of above-mentioned iron-copper material includes the steps：
A. Medium frequency induction stove heat is used, furnace lining selects acid lining, first toward adding ingot iron by several times in stove and be heated to
1600 DEG C or so, so that scaling powder should be added on a small quantity in fusing, the pure iron delivered first；
B. after after iron fusing, scaling powder or glass are first added, to prevent iron oxidation isolation gas, is subsequently added about
0.6% ferromanganese is so as to deoxidation；
C. after manganese-ferro deoxidation, copper was added through 5 minutes, copper is added by several times, to prevent solidification while being heated evenly, holding furnace is needed
It is interior temperature-resistant, first three time add copper material ratio should be after add copper material 1/3rd, first three time add copper material when
Between interval about three minutes, and with significantly stirring；Then quick equal proportion adds copper material every time, and is quickly stirred, to the greatest extent
Amount makes copper and iron uniform doping；
D. add after copper material, add phosphor-copper and carry out deoxidation；Add after phosphor-copper, ferromanganese (0.1% of furnace charge) is added again and is taken off
Oxygen；
E. after manganese addition iron, a few minutes addition ferrosilicon is crossed；Face before casting, a small amount of aluminium is added into aluminium alloy；
F. temperature in rise stove, beats surface scum in net stove by about 1700 DEG C
G. alloy cast uses resin sand mould moulding, in cast, casting ladle first is preheating into 1200 DEG C or so, is subsequently poured into
Alloy melt, pouring temperature is 1550-1600 DEG C, should rapidly be stirred during cast alloy, prevent it to be layered, its casting such as Fig. 1 institutes
Show.
H. when alloy is come out of the stove, blower fan is driven with high-speed electric expreess locomotive, magnetic conduction electrical conductivity alloy body surface face is brushed, it is to avoid alloy surface
Premature oxidation, forms stomata, influences post-production.
I. 800 DEG C are heated up to, 6 hours are incubated, with furnace temperature natural cooling.
The conductive iron-copper material of the magnetic conduction prepared is dimensioned to hair according to generator end shielding construction part
Motor end shielding construction part, its electrical conductivity is 0.04572 Ω mm2/ m, magnetization curve is as shown in Figure 2.
In summary, the iron-copper material for generator end shielding construction of the embodiment of the present invention is with normal in producing
Ingot iron and cathode copper are Main elements, using sand casting process, prepare generator end shielding construction part iron copper
Alloy material, Fe-Cu alloys have into low magnetic conductivity, it is simple in construction the features such as, raw material are readily available, preparation technology and Re Chu
Rational technology is managed succinct, the need for meeting Practical Project.
The iron-copper material of the embodiment of the present invention uses the conductive metallic shield of magnetic conduction, simultaneously " supporting containing copper shield
Magnetic " effect and " poly- magnetic " effect of magnetic screen, are greatly enhanced than the shield effectiveness only with single copper shield or magnetic screen,
Effectively ensure the shield effectiveness of generator end, also reduce generator end while using copper shield and magnet shielding structure
Complexity.
The embodiment of the present invention is drawn by the metallographic structure analysis to as cast condition iron-copper：When copper content reaches 80%, such as
It is that certain thickness continuous net has been generally defined on equiaxial ferritic crystal boundary that Fig. 3, which can see its tissue signature,
Shape structure, now hardness has declined, because the hardness of fine copper is very low, it is brilliant when the content of copper reaches a certain amount of
Substantial amounts of copper is have accumulated at boundary, the hardness that this tissue inevitably results in iron-copper declines.
One of ordinary skill in the art will appreciate that：Accompanying drawing be module in the schematic diagram of one embodiment, accompanying drawing or
Flow is not necessarily implemented necessary to the present invention.
Each embodiment in this specification is described by the way of progressive, identical similar portion between each embodiment
Divide mutually referring to what each embodiment was stressed is the difference with other embodiment.Especially for device or
For system embodiment, because it is substantially similar to embodiment of the method, so describing fairly simple, related part is referring to method
The part explanation of embodiment.Apparatus and system embodiment described above is only schematical, wherein the conduct
The unit that separating component illustrates can be or may not be it is physically separate, the part shown as unit can be or
Person may not be physical location, you can with positioned at a place, or can also be distributed on multiple NEs.Can root
Some or all of module therein is factually selected to realize the purpose of this embodiment scheme the need for border.Ordinary skill
Personnel are without creative efforts, you can to understand and implement.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
It is defined.
Claims (5)
1. a kind of iron-copper material with low magnetic high conductivity characteristic, it is characterised in that including：Copper, iron, silicon, aluminium, manganese,
P and ses, the percentage by weight of the copper is 80%, and the iron-copper material magnetic conduction is conductive, and the iron-copper material
Electrical conductivity be 0.04572 Ω mm2/m。
2. the iron-copper material according to claim 1 with low magnetic high conductivity characteristic, it is characterised in that each into
Point percentage by weight be：Copper 80wt.%, iron 18.45wt.%, carbon ＜ 0.15wt.%, silicon 0.35wt.%, aluminium 0.3wt.%,
Manganese 0.7wt.%, phosphorus 0.05wt.%, sulphur ＜ 0.025wt.%.
3. the iron-copper material according to claim 2 with low magnetic high conductivity characteristic, it is characterised in that the copper
For cathode copper, comprising 99.95%Cu, the iron is pure iron or A3 steel, comprising 99.6%Fe, and the silicon is ferrosilicon, comprising
Si75%, the manganese is ferromanganese, comprising Mn65%, and the phosphorus is phosphor-copper.
4. a kind of preparation side of the iron-copper material with low magnetic high conductivity characteristic described in any one of claims 1 to 3
Method, it is characterised in that including：
A. Medium frequency induction stove heat is used, furnace lining selects acid lining, first toward adding ingot iron by several times in stove and be heated to 1600
DEG C or so；
B. after after ingot iron fusing, scaling powder or glass are first added into the stove, the ferromanganese of rear addition 0.6% with
Just deoxidation；
C. after after the manganese-ferro deoxidation, adding copper by several times into the stove, keep the in-furnace temperature constant, first three time adds copper
Ratio for after add copper 1/3rd, first three time add copper time interval be three minutes, and with stirring；It is then every
Secondary equal proportion is stirred toward adding copper in the stove, makes copper and iron uniform doping；
D. add after copper material, phosphor-copper is added into the stove and carries out deoxidation, is added after phosphor-copper, again toward adding ferromanganese in the stove
Deoxidation；
E. after manganese addition iron, a few minutes are spent toward adding ferrosilicon in the stove；Face before casting, aluminium is added into aluminium alloy；
F. temperature, to 1700 DEG C, beats surface scum in net stove in rise stove
G. alloy cast uses resin sand mould moulding, in cast, casting ladle first is preheating into 1200 DEG C or so, alloy is subsequently poured into
Melt, pouring temperature is 1550-1600 DEG C, should be stirred during cast alloy；
H. when alloy body is come out of the stove, blower fan is driven with motor, the conductive alloy body surface of magnetic conduction is brushed；
Temperature in stove is raised, to 800 DEG C, to be incubated 6 hours, with furnace temperature natural cooling, obtain with low magnetic high conductivity characteristic
The iron-copper material of iron-copper material.
5. the preparation method of the iron-copper material according to claim 4 with low magnetic high conductivity characteristic, its feature
It is, described iron-copper material is used for generator end shielding construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710618046.3A CN107254599B (en) | 2017-07-26 | 2017-07-26 | Iron-copper material and preparation method thereof with low magnetic high conductivity characteristic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710618046.3A CN107254599B (en) | 2017-07-26 | 2017-07-26 | Iron-copper material and preparation method thereof with low magnetic high conductivity characteristic |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107254599A true CN107254599A (en) | 2017-10-17 |
| CN107254599B CN107254599B (en) | 2018-12-28 |
Family
ID=60026108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710618046.3A Active CN107254599B (en) | 2017-07-26 | 2017-07-26 | Iron-copper material and preparation method thereof with low magnetic high conductivity characteristic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107254599B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110004319A (en) * | 2017-12-26 | 2019-07-12 | 株式会社Posco | Iron-copper material and preparation method thereof |
| CN110205512A (en) * | 2019-05-22 | 2019-09-06 | 陕西斯瑞新材料股份有限公司 | A kind of preparation method of the new type medical equipment copper alloy with bactericidal function |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06100983A (en) * | 1992-09-22 | 1994-04-12 | Nippon Steel Corp | Metal foil for tab tape having high young's modulus and high yield strength and its production |
| CN105002392A (en) * | 2015-06-02 | 2015-10-28 | 苏州晓锋知识产权运营管理有限公司 | Cable capable of shielding electromagnetic wave and preparing method for copper iron alloy of cable |
| CN105002393A (en) * | 2015-07-06 | 2015-10-28 | 刘实 | Manufacturing method of Fe-Cu composite metal material, Fe-Cu composite metal material and application thereof |
| CN105177344A (en) * | 2015-07-30 | 2015-12-23 | 张连仲 | Cu-Fe alloy wire and preparing method thereof |
-
2017
- 2017-07-26 CN CN201710618046.3A patent/CN107254599B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06100983A (en) * | 1992-09-22 | 1994-04-12 | Nippon Steel Corp | Metal foil for tab tape having high young's modulus and high yield strength and its production |
| CN105002392A (en) * | 2015-06-02 | 2015-10-28 | 苏州晓锋知识产权运营管理有限公司 | Cable capable of shielding electromagnetic wave and preparing method for copper iron alloy of cable |
| CN105002393A (en) * | 2015-07-06 | 2015-10-28 | 刘实 | Manufacturing method of Fe-Cu composite metal material, Fe-Cu composite metal material and application thereof |
| CN105177344A (en) * | 2015-07-30 | 2015-12-23 | 张连仲 | Cu-Fe alloy wire and preparing method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110004319A (en) * | 2017-12-26 | 2019-07-12 | 株式会社Posco | Iron-copper material and preparation method thereof |
| CN110205512A (en) * | 2019-05-22 | 2019-09-06 | 陕西斯瑞新材料股份有限公司 | A kind of preparation method of the new type medical equipment copper alloy with bactericidal function |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107254599B (en) | 2018-12-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102615108B (en) | Centrifugal casting high-speed steel composite roll and manufacture method thereof | |
| CN102456458B (en) | High-corrosion-resistance sintered neodymium iron boron magnet and preparation method thereof | |
| CN110512116A (en) | A kind of high Nb-TiAl intermetallic compound of multicomponent high-alloying | |
| GB1299983A (en) | Improvements in diffusion bonding of super-alloy members | |
| JP5170975B2 (en) | Manufacturing method of iron-based amorphous material | |
| JP5532149B2 (en) | High electrical resistance aluminum alloy | |
| JP6954846B2 (en) | Spheroidal graphite cast iron | |
| CN107254599A (en) | Iron-copper material with low magnetic high conductivity characteristic and preparation method thereof | |
| JPS58144569A (en) | Electromagnetic shield | |
| JP2005143248A (en) | Rotor for rotary electric machine | |
| CN100537818C (en) | A kind of constant modulus alloy with high magnetic induction and low frequency temperature coefficient | |
| JP3245094B2 (en) | Method of manufacturing rotor shaft for rotating electric machine | |
| JP7260816B2 (en) | Rotor for eddy current speed reducer | |
| JP2010162588A (en) | Continuous casting method for magnesium alloy | |
| CN110373606B (en) | Resource recovery method of waste nanocrystalline iron core and application thereof | |
| CN113584350A (en) | High-temperature oxidation resistant cast high-tungsten-nickel-based alloy and preparation method thereof | |
| CN103757543B (en) | A kind of rare earth reinforced cupric precipitation strength steel and preparation method thereof | |
| JP5746987B2 (en) | High-strength austenitic steel and industrial products using it | |
| JP2988109B2 (en) | Rotor shaft for rotating electric machine and rotating electric machine using the same | |
| KR20100033357A (en) | Material for generator rotor shaft | |
| CN106929731A (en) | A kind of U-10Zr alloy smelting process | |
| CN103820690B (en) | A kind of permeability alloys material for energy-saving electric machine and preparation method thereof | |
| CN103131964A (en) | Method for improving as-cast structure homogeneity of X12CrMoWVNbN10-1-1 martensitic stainless steel | |
| CN115831516B (en) | Magnetic conduction sleeve, preparation method and application thereof | |
| JPS6379933A (en) | Ni-base alloy and its production and rotary electric damper and retaining ring made of ni-base 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 |