CN1083894C - Process for manufacturing strip made of alloy of iron-nickel type from continuously cast thin strip - Google Patents
Process for manufacturing strip made of alloy of iron-nickel type from continuously cast thin strip Download PDFInfo
- Publication number
- CN1083894C CN1083894C CN98118466A CN98118466A CN1083894C CN 1083894 C CN1083894 C CN 1083894C CN 98118466 A CN98118466 A CN 98118466A CN 98118466 A CN98118466 A CN 98118466A CN 1083894 C CN1083894 C CN 1083894C
- Authority
- CN
- China
- Prior art keywords
- strip
- nickel
- alloy
- band
- homogenization treatment
- 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
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/001—Heat treatment of ferrous alloys containing Ni
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/07—Shadow masks
- H01J2229/0727—Aperture plate
- H01J2229/0733—Aperture plate characterised by the material
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
- Continuous Casting (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Process for manufacturing a strip made of an alloy of the iron-nickel type containing, mainly, from 25% to 50% nickel by weight and from 50% to 75% iron by weight and, optionally, one or more alloying elements such as, especially, cobalt, chromium, molybdenum, manganese, silicon, vanadium, tantalum, titanium and aluminium, in contents of less than 8% by weight, the balance being impurities resulting from the smelting operation, in which process a thin strip is continuously cast with a thickness of less than 10 mm, the thin strip is rolled and, before or after rolling, a homogenization treatment, consisting of a temperature hold at a temperature T (in DEG C) for a time t (in hours) such that: t > 0.5 x 10<-12> exp (38000/((T+273)), is carried out so as to obtain a ''standard degree of segregation'' of the nickel of less than 0.4%.
Description
The present invention relates to a kind of thin strip that will obtain and be processed into the alloy of iron-nickel type band by the direct continuous casting of thin strip.
Alloy of iron-nickel type is well-known, and this alloy is extensive use of because of its magnetic or its expansion character.The chemical ingredients of this alloy mainly comprises the nickel of 25%-50% weight percent, the iron of 50%-75% weight percent, and comprises that selectively at least a alloying element and content in cobalt, chromium, the molybdenum are lower than 5%.For example, to contain about 36% or 33% nickel, about 4% cobalt, surplus be iron substantially and contain a small amount of additional elements selectively and impurity and to have low expansion alloy be well-known.These have low expansion alloy is also used because of its good magnetic, especially thickness be generally 1/10th and a few tenths of millimeter between cold-strip be used widely especially.Specifically, the characteristics of the magnetic that is obtained show as the coercive field that is lower than 55A/m.
For making such cold-strip, alloy is cast steel billet or steel ingot thick more than the 100mm.Subsequently, hot-rolled steel ingot or steel billet are to obtain thick hot rolled band below the 5mm.After this, cold rolling hot rolled band is to obtain cold-strip and under about 750 ℃ temperature cold-strip to be carried out recrystallization annealing.The shortcoming of this technology is to need large-scale hot rolling processing.
For limiting or avoiding hot rolling, can directly the alloy continuous casting be become thin strip thick below the 10mm.For this reason, can adopt the continuous caster of the continuous casting moulding between two rotating rollers with transverse axis of thin strip wherein.But the contriver finds that the cold-strip of being made by continuously cast thin strip unexpectedly has much better than coercive field than the cold-strip of being made by steel ingot or steel billet.
The working method that the objective of the invention is the cold-strip by a kind of alloy of iron-nickel type is provided remedies this shortcoming, described cold-strip is to be made by a thin strip that obtains by direct continuously cast thin strip, and it has and the same gratifying magnetic of similar alloy band that is shut out by steel ingot or steel billet.
For this reason, theme of the present invention is a kind of working method of alloy of iron-nickel type band, described alloy strip steel rolled stock mainly contains the nickel of 25%-50% weight percent, the iron of 50%-75% weight percent also for example selectively contains particularly cobalt, chromium, molybdenum, manganese, silicon, vanadium, tantalum, one or more and its content in titanium and the aluminium is lower than 8% alloying element by weight percentage, and the impurity that produces during for melting operation of surplus, wherein continuous casting goes out the following thick thin strip of a 10mm, described thin strip is rolled and before rolling or after rolling band is carried out homogenization treatment, thereby obtained to be lower than " the normal segregation degree " of 0.4% nickel, described homogenization treatment be included in temperature T (℃) down insulation for some time t (hour):
t≥0.5×10
-12exp(38000/(T+273))。
The content sum of cobalt, chromium, molybdenum, manganese, silicon, vanadium, tantalum, titanium and aluminium is preferably lower than or equals 8%.
The normal segregation degree of nickel is preferably lower than 0.35%.
Can carry out homogenization treatment to the thin strip that directly obtains by continuous casting, perhaps to the band after the hot rolling or cold rolling after band carry out homogenization treatment.
After being preferably in homogenization treatment strap cold rolling is arrived the finished product thickness of strip, thereby give band adjustable crystalline structure.
When nickel content is 35%-37%, 750 ℃ band carried out 15 minutes annealing after, coercive field Hc is less than 45A/m.
When nickel content be 32%-34%, when cobalt contents is 3.5%-6.5%, 750 ℃ band carried out 15 minutes annealing after, coercive field Hc is less than 55A/m.
Below will describe the present invention particularly and illustrate in infinite mode.
The contriver very unexpectedly finds for the first time: the magnetic of alloy of iron-nickel type is subjected to by solidifying the influence at interdendritic microsegregation of the nickel that causes.
For showing this influence, the contriver has defined " normal segregation degree ", and this notion can illustrate the nickel microsegregation situation in the cold-strip and treat the microsegregation situation of nickel in the cold rolling hot rolled band.Treat that cold rolling hot rolled band can be that hot rolling or additional heat treatment have selectively been passed through in a thin strip that directly obtains by the thin strip continuous casting and it.In order to represent clearlyer and vivider, directly the thickness of the thin strip that obtains by the thin strip continuous casting is 1mm-10mm.
" the normal segregation degree " of contriver definition be nickel content in the unbiased estimator of thickness less than the standard profile deviation on the whole thickness of the cold-strip of 0.2mm, wherein said band is handled 850 ℃ of recrystallization annealings of accepting 15 minutes down.
Be the degree of segregation that settles the standard, measure the nickel content of (on a line, getting a bit) on the many points that are distributed in whole thickness by scanning electron microscopy and in conjunction with energy diffusion spectrum (EDS) on less than the thin plate of 0.2mm every 1um perpendicular to the surface at thickness.Thus, obtained nickel content (Ni)
j(j=1 ... n) n value also utilizes following formula to calculate normal segregation degree σ
Ni:
In this formula, (Ni)
FlatRepresentative (Ni)
jArithmetical av, n measures number of times.
Utilize this definition, do not having under the situation of special processing, according to prior art, concerning the thin strip that obtains through thin strip direct continuous casting and hot rolling-cold rolling, the normal segregation degree of nickel is higher than 0.5%, and concerning the cold-strip that is formed by steel ingot, the normal segregation degree of nickel is lower than 0.35%.
In order to process the cold-strip that obtains by the thin strip continuous casting, in electric arc furnace, melt aforesaid alloy of iron-nickel type and in built-in steel drum, it is carried out refining, doing like this is to wish to make this alloy for example to contain 36% nickel, be preferably the manganese of 0.02%-0.5%, and its surplus is the impurity that iron and melting are brought.Thereby utilization have two horizontally disposed and be parallel to each other and constitute a width less than 10mm and be generally the alloy liquid that the thin strip continuous caster of roller in the gap of 1mm-5mm will so obtain and cast thin strip.These two rollers flow downward thereby drive alloy around separately axis backward rotation, and this makes alloy flow through roll gap.Circulate by internal water and to cool off this two rollers, thereby when alloy contacts with roller, leave their bite with the alloy cooling and with the shape of solidifying band that a thickness approximates the width of roller spacing.Then, utilize reeling machine to batch thin strip, to obtain to accept usually the roll coil of strip of air cooling.
Behind continuous casting, thin strip can randomly be accepted hot rolling and be preferably in band to carry out hot rolling after being reheated 1050 ℃-1300 ℃.
After pickling, the hot rolled band of acquisition like this is carried out cold rolling, to obtain cold-strip with desirable finished product thickness (may be 0.1mm-0.25mm).Usually, in several steps that separated by about 1000 ℃ recrystallization annealing operation, carry out cold rolling.For example, first step allows to obtain the thickness of 0.5mm-2mm, and second step allows to obtain the thickness of 0.15mm-0.3mm, and final step produces finished product thickness.Cold rollingly not only be used to obtain finished product thickness, and be used to give the certain crystalline structure of band and control grain size, described crystalline structure must be a cubic(al)grating preferably, and grain size preferably must have the AFNOR index of about 8-9.
Except hot rolling and cold rolling, band processing is final to be finished through homogenization treatment, described homogenization treatment comprise at least temperature T (℃) down insulation for some time t (hour):
t≥A exp(38000/(T+273))。
Coefficient A is more than or equal to 0.5 * 10
-12, more preferably greater than 1 * 10
-12
Also can be in temperature T
1, T
2T
nUnder to carry out several times consuming time for t
1, t
2T
nContinuous homogenization treatment.In this case, time and temperature must satisfy following formula:
Wherein A is greater than 0.5 * 10
-12, and it is more preferably greater than 1 * 10
-12
For the thick band of 3mm (directly being obtained by the thin strip continuous casting), these conditions for example are equivalent to be incubated half an hour down or be incubated 10 minutes down at 1200 ℃ at 1150 ℃.
Although the homogenization treatment that finished product is carried out is more effective and be easier to carry out, when cold-strip final cold rolling is when wanting to produce specific grain size and crystalline structure, band is thin more, and homogenization treatment is absolute more must carry out before final cold rolling step.If do not do like this, then will destroy crystalline structure and cause grain coarsening.
When on thin strip, finishing homogenization treatment, thin strip or be lower than 0.4% or 0.35% by " normal segregation degree " that the characteristics of its cold-strip that makes show as nickel.When only finishing homogenization treatment on cold-strip, " the normal segregation degree " that have only the characteristics of cold-strip to show as nickel is lower than 0.4% or 0.35%.
When cold-strip of the present invention by having low expansion alloy when making, wherein this alloy mainly contains the nickel of 35%-37%, 750 ℃ band carried out 15 minutes annealing after, the coercive field Hc of cold-strip is less than 45A/m.When cold-strip is that 32%-34%, cobalt contents are the low expansion alloy of having of 3.5%-6.5% when making by a kind of nickel content, 750 ℃ band carried out annealing in 15 minutes after, then the coercive field Hc of cold-strip is less than 55A/m.
For example, compare between thin strip TSCC3, TSCC2 that two direct continuous castings go out and two ingot casting IC1, IC2, wherein ingot casting and thin strip are to be that the alloy of iron and the impurity that brought by smelting operation is made by a kind of 36% nickel, 0.3% manganese and surplus of containing.
Roll out the thick cold-strip of 0.12mm and under 750 ℃ and 850 ℃, it is carried out anneal by these foundry goods.
Ingot casting IC1, IC2 at first pass through hot rolling so that obtain the thick hot rolled band of 3mm.Then, hot rolled band is cold rolled to the finished product thickness of strip.Cold-strip IS1, IS2 have so been obtained, for contrast.
The thickness of the thin strip that is obtained by the direct continuous casting of thin strip is that 3mm and it are used to make following several cold-strips:
-as a comparison case, direct cold-strip TS3C, the TS2C by cold rolling acquisition;
-except cold rolling, accept cold-strip TS3I1, TS3I2, TS3I3, TS2I1 and the TS2I2 of homogenization treatment according to the present invention.
Homogenization treatment is:
-TS3I1:1150 ℃ is incubated 30 minutes down;
-TS3I2:1250 ℃ is incubated 30 minutes down;
-TS3I3: after being 50% cold rolling step, 1200 ℃ of insulations 20 minutes down through draught;
35% hot rolling is accepted draught and is in-TS2I2:1250 ℃ of down insulation 30 minutes subsequently.
In all cold-strips that so obtain, measure the normal segregation degree σ of nickel
Ni, coercive field Hc and magnetic permeability μ
Max, dc
Its result is as follows:
| 750 ℃ of annealing down | 850 ℃ of annealing down | ||||
| σ Ni(％) | Hc(A/ m) | μ max，dc | Hc(A/m ) | μ max，dc | |
| IS1 | 0.30 | 34.2 | 9300 | 26.3 | 11800 |
| IS2 | 0.32 | 39.0 | 5400 | 28.2 | 6400 |
| TS3C | 0.54 | 64.6 | 3200 | 52.2 | 3700 |
| TS2C | 0.75 | 68.3 | 3200 | 56.7 | 3600 |
| TS3I1 | 0.39 | 43.4 | 5200 | 38.2 | 5500 |
| TS3I2 | 0.38 | 44.6 | 5400 | 34.5 | 6400 |
| TS3I3 | 0.36 | 43.2 | 5100 | 36.2 | 5700 |
| TS2I2 | 0.32 | 39.4 | 6200 | 30.0 | 7600 |
| CS1 | 0.30 | 33.9 | 9700 | 25.8 | 12100 |
On the one hand, these results demonstrate: because the continuously cast thin strip direct cold rolling is become cold-strip and do not carry out any homogenization treatment, so can not after 750 ℃ thermal treatments in 15 minutes, obtain to be lower than the coercive field of 50A/m, and in the band that makes by steel ingot, can obtain such coercive field without difficulty.But, when the processing of the cold-strip that is made by continuously cast thin strip finishes to allow nickel segregation value to be reduced to the homogenization treatment below 0.4%, obtained to be lower than the coercive field of 45A/m.
In addition, the coefficient of expansion of band of the present invention is 0.99 * 10
-6(20 ℃-100 ℃), grain-size G
AFNORBe 9, and formed 100}＜001〉and cubic crystal structure and magnetic pole density l/l
0=5.750 ℃ of following recrystallize thermal treatments after 15 minutes, the crystalline structure isotropy.
Claims (10)
1. the working method of a band of making by alloy of iron-nickel type, described alloy strip steel rolled stock mainly contains the nickel of 25%-50% weight percent, the iron of 50%-75% weight percent also can randomly contain cobalt, chromium, molybdenum, manganese, silicon, vanadium, tantalum, one or more and its content in titanium and the aluminium is lower than 8% alloying element by weight percentage, the impurity that its surplus produces during for melting operation, it is characterized in that, continuous casting goes out the thin strip of a thickness less than 10mm, to described thin strip be rolled and before rolling or rolling back band is carried out homogenization treatment, thereby obtain to be lower than " the normal segregation degree " of 0.4% nickel, described homogenization treatment be included in temperature T (℃) down insulation for some time t (hour):
t≥0.5×10
-12exp(38000/(T+273))。
2. the method for claim 1 is characterized in that, the normal segregation degree of nickel is lower than 0.35%.
3. the method for claim 1 is characterized in that, the thin strip that is directly obtained by continuous casting is carried out homogenization treatment.
4. the method for claim 1 is characterized in that, after the thin strip that is obtained by continuous casting is carried out hot rolling, carries out homogenization treatment.
5. the method for claim 1 is characterized in that, carries out homogenization treatment behind cold rolling manipulation.
6. as the described method of one of claim 3-5, it is characterized in that, after homogenization treatment, strap cold rolling is arrived the finished product thickness of strip, thereby give band regulatable crystalline structure.
7. as the described method of one of claim 3-5, it is characterized in that the chemical ingredients of alloy is such, promptly nickel content is 35%-37%, and when 750 ℃ band carried out 15 minutes annealing after, coercive field Hc is lower than 45A/m.
8. as the described method of one of claim 3-5, it is characterized in that the chemical ingredients of alloy is such, be that nickel content is 32%-34%, and cobalt contents is 3.5%-6.5%, and when 750 ℃ band carried out 15 minutes annealing after, coercive field Hc is lower than 55A/m.
9. method as claimed in claim 7 is characterized in that, after homogenization treatment, strap cold rolling is arrived the finished product thickness of strip, thereby give band regulatable crystalline structure.
10. method as claimed in claim 8 is characterized in that, after homogenization treatment, strap cold rolling is arrived the finished product thickness of strip, thereby give band regulatable crystalline structure.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9710533A FR2767538B1 (en) | 1997-08-21 | 1997-08-21 | PROCESS FOR PRODUCING A FER-NICKEL ALLOY STRIP FROM A HALF CONTINUOUS CASTING PRODUCT |
| FR9710533 | 1997-08-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1213005A CN1213005A (en) | 1999-04-07 |
| CN1083894C true CN1083894C (en) | 2002-05-01 |
Family
ID=9510417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98118466A Expired - Fee Related CN1083894C (en) | 1997-08-21 | 1998-08-20 | Process for manufacturing strip made of alloy of iron-nickel type from continuously cast thin strip |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0905263A1 (en) |
| JP (1) | JPH11131146A (en) |
| CN (1) | CN1083894C (en) |
| FR (1) | FR2767538B1 (en) |
| TW (1) | TW416873B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10146301C1 (en) * | 2001-09-19 | 2002-07-18 | Krupp Vdm Gmbh | Production of a strip made from an iron-nickel alloy, used for shadow masks in flat monitors and TV screens, comprises continuous or batch-type annealing a strip made from an iron alloy containing nickel, molybdenum and chromium |
| CN101181773B (en) * | 2007-12-17 | 2010-06-02 | 西部金属材料股份有限公司 | Method for preparing tantalum long-strip having high deep-punching performance and high grain fineness grade |
| CN102716906B (en) * | 2012-07-10 | 2015-04-01 | 冶科金属有限公司 | Method for producing iron nickel strip for high plate-shaped integrated circuit (IC) lead frame |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01252725A (en) * | 1988-03-31 | 1989-10-09 | Nippon Steel Corp | Manufacture of fe-ni alloy sheet for shadow mask |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6056053A (en) * | 1983-09-07 | 1985-04-01 | Nippon Mining Co Ltd | Iron-nickel alloy for shadow mask which suppresses generation of uneven stripe during etching |
| JPS61223188A (en) * | 1985-03-28 | 1986-10-03 | Nippon Mining Co Ltd | Iron-nickel alloy for shadow mask which suppresses generation of uneven stripe during etching |
| FR2641796B1 (en) * | 1988-08-19 | 1993-01-08 | Nippon Yakin Kogyo Co Ltd | PROCESS FOR PRODUCING FE-NI-B SERIES ALLOYS HAVING IMPROVED MODERATOR EFFECT OF THE PRESENCE OF TRAILS DURING ENGRAVING |
| JP2723718B2 (en) * | 1991-09-27 | 1998-03-09 | ヤマハ株式会社 | Fe-Ni-Co alloy for shadow mask |
| FR2727131B1 (en) * | 1994-11-23 | 1996-12-13 | Imphy Sa | FER-NICKEL ALLOY WITH LOW EXPANSION COEFFICIENT |
| FR2728724B1 (en) * | 1994-12-27 | 1997-01-24 | Imphy Sa | METHOD FOR MANUFACTURING AN IRON-NICKEL ALLOY SHADOW MASK |
| JPH09143625A (en) * | 1995-11-27 | 1997-06-03 | Nikko Kinzoku Kk | Iron-nickel alloy stock for shadow mask |
-
1997
- 1997-08-21 FR FR9710533A patent/FR2767538B1/en not_active Expired - Fee Related
-
1998
- 1998-08-07 EP EP98402020A patent/EP0905263A1/en not_active Withdrawn
- 1998-08-20 CN CN98118466A patent/CN1083894C/en not_active Expired - Fee Related
- 1998-08-20 JP JP23405698A patent/JPH11131146A/en active Pending
- 1998-09-14 TW TW87113819A patent/TW416873B/en not_active IP Right Cessation
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01252725A (en) * | 1988-03-31 | 1989-10-09 | Nippon Steel Corp | Manufacture of fe-ni alloy sheet for shadow mask |
Also Published As
| Publication number | Publication date |
|---|---|
| TW416873B (en) | 2001-01-01 |
| FR2767538B1 (en) | 2001-05-11 |
| JPH11131146A (en) | 1999-05-18 |
| CN1213005A (en) | 1999-04-07 |
| EP0905263A1 (en) | 1999-03-31 |
| FR2767538A1 (en) | 1999-02-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C53 | Correction of patent for invention or patent application | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: IMPHY S.A. TO: AMFI UJINA PRECISION CORP. |
|
| CP03 | Change of name, title or address |
Address after: French pitot Applicant after: Imphy Ugine Precision Co. Address before: French AUX Applicant before: Imphy S. A. |
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