JPS62227053A - High permeability magnetic alloy excellent in workability - Google Patents
High permeability magnetic alloy excellent in workabilityInfo
- Publication number
- JPS62227053A JPS62227053A JP61071448A JP7144886A JPS62227053A JP S62227053 A JPS62227053 A JP S62227053A JP 61071448 A JP61071448 A JP 61071448A JP 7144886 A JP7144886 A JP 7144886A JP S62227053 A JPS62227053 A JP S62227053A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- high permeability
- workability
- less
- alloy
- 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.)
- Pending
Links
- 230000035699 permeability Effects 0.000 title claims abstract description 25
- 229910001004 magnetic alloy Inorganic materials 0.000 title claims abstract description 19
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000000137 annealing Methods 0.000 abstract description 6
- 229910045601 alloy Inorganic materials 0.000 abstract description 5
- 239000000956 alloy Substances 0.000 abstract description 5
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 4
- 229910052796 boron Inorganic materials 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 229910052748 manganese Inorganic materials 0.000 abstract description 3
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 3
- 229910052804 chromium Inorganic materials 0.000 abstract description 2
- 229910052759 nickel Inorganic materials 0.000 abstract 2
- 229910052802 copper Inorganic materials 0.000 abstract 1
- 229910052742 iron Inorganic materials 0.000 abstract 1
- 238000004080 punching Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 9
- 238000001816 cooling Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 230000004907 flux Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
Landscapes
- Soft Magnetic Materials (AREA)
Abstract
Description
【発明の詳細な説明】
利用産業分野
この発明は、７０ｗｔ％〜８５ｗｔ％ＮＬ系高透磁率磁
性合金の改良に係り、磁性焼鈍における冷却速度条件に
影響を受けず、すぐれた磁気特性が得られ、かつ熱間加
工性及び打抜き性のすぐれたＮＬ系高透磁率磁性合金に
関する。Detailed Description of the Invention Field of Application This invention relates to the improvement of a 70 wt% to 85 wt% NL-based high permeability magnetic alloy, which is unaffected by the cooling rate conditions during magnetic annealing and can provide excellent magnetic properties. The present invention relates to an NL-based high permeability magnetic alloy having excellent hot workability and punchability.
背景技術
現在、Ｆｓ ＮＬ系高透磁率磁性合金は、オーディオ
、ＶＴＲ機器等のシールド材、小型精密煎器用磁気回路
のヨーク材、あるいは高級トランスのコア材等、その利
用範囲は多種多様を極め、ざらに、昨今のエレクトロニ
クスの発達に共ない、各種機器の小型高性能化が進み、
かかる磁性合金の特性もなお一層の向上が望まれている
。Background Art Currently, Fs NL-based high permeability magnetic alloys are used in a wide variety of applications, such as shielding materials for audio and VTR equipment, yoke materials for magnetic circuits for small precision brewers, and core materials for high-end transformers. In general, with the recent development of electronics, various devices have become smaller and more sophisticated.
Further improvements in the properties of such magnetic alloys are desired.
一般に、すぐれた特性を示すＦｅ ＮＬ系高透磁率磁
性合金を得るには、適切な、組成に管理することは勿論
のこと、磁性焼鈍条件を厳密に選定管理する必要があっ
た。Generally, in order to obtain a Fe NL-based high permeability magnetic alloy that exhibits excellent properties, it is necessary not only to control the composition to be appropriate but also to strictly select and control the magnetic annealing conditions.
出願人は、先に、上述のＦｅ ＮＬ系高透磁率磁性合
金にお【ブる磁性焼鈍条件の選定、管理の問題を解消し
、冷却速度条件を厳しく選定する必要がなく、高い透磁
率を発現させることができるＦａ −Ｎ＝系高透磁率磁
性合金として、７０ｗｔ％〜８５ｗｔ％ＮＬパーマロイ
にｌｌｎを多聞に含有させた磁性合金を提案（特願昭８
０−２３６１７１号）した。The applicant has previously solved the problem of selecting and managing magnetic annealing conditions for the above-mentioned Fe NL-based high permeability magnetic alloy, eliminating the need to strictly select cooling rate conditions, and achieving high permeability. We proposed a magnetic alloy containing a large amount of lln in NL permalloy of 70 wt% to 85 wt% as a high permeability magnetic alloy of the Fa-N= system that can express
No. 0-236171).
一方、Ｆｅ ＮＬ系高透磁率磁性合金は、結晶粒界に
ｐ、ｓ、ｏ等の不純物の偏析及び炭化物、硫化物、りん
化物、ｌ化物あるいは低融点共晶化合物等の生成により
、熱間圧延時、粒界割れを生じて、熱間圧延板の耳割れ
、及び表面割れ疵等を発生し、熱間加工性の劣化による
製品歩留の低下を招来し、また、かかる磁性合金の高Ｎ
Ｌ含有のため、材質的に靭性が大きく、打抜き時に金型
寿命を短くする問題があった。On the other hand, Fe NL-based high permeability magnetic alloys suffer from the segregation of impurities such as p, s, and o at the grain boundaries and the formation of carbides, sulfides, phosphides, l-rides, or low-melting eutectic compounds. During rolling, grain boundary cracks occur, resulting in edge cracks and surface cracks in the hot-rolled sheet, leading to a decrease in product yield due to deterioration of hot workability. N
Due to the L content, the material has a high toughness, which caused the problem of shortening the life of the die during punching.
前記の高ｔ’Ｉｎ含有高透磁率磁性合金は、高ｔ’Ｉｎ
を含有しないＦｅ Ｎｉ系高透磁率磁性合金に比べて
、熱間加工性が改善されているが、充分でなく、前記問
題を右していた。The above-mentioned high t'In-containing high permeability magnetic alloy has a high t'In content.
Although the hot workability is improved compared to the Fe-Ni-based high permeability magnetic alloy that does not contain Fe-Ni, it is not sufficient and causes the above-mentioned problem.
発明の目的
この発明は、すぐれた磁気特性と共にすぐれた熱間加工
性を有する７０ｗｔ％〜８５ｗｔ％ＮＬ系高透磁率磁性
合金を目的とし、とくに、高肯含有による磁性焼鈍にお
ける冷却速度条件に影響を受は難い効果を保持し、かつ
すぐれた熱間加工性及び打抜き性が得られるｚｏｗｔ％
〜８５ｗｔ％ＮＬ系高透磁率磁性合金を目的としている
。Purpose of the Invention The object of the present invention is to provide a 70wt% to 85wt% NL-based high magnetic permeability magnetic alloy that has excellent magnetic properties and excellent hot workability. zowt% that maintains the effect that is difficult to receive and provides excellent hot workability and punching properties.
The target is a ~85wt% NL-based high permeability magnetic alloy.
発明の構成と効果
この発明は、高磁気特性とすぐれた熱間加工性及び打抜
き性の両立を目的に、７ｑｗｔ％〜８５ｗｔ％ＮＬ系高
透磁率磁性合金の組成を種々検討した結果、特定量のｒ
ｌｎ、Ｅｌを含有させ、かつＳ、Ｐ、Ｃ含有量を低減す
ることにより、高磁気特性とすぐれた熱間加工性及び打
抜き性が１ｑられることを知見したものである。Structure and Effects of the Invention The present invention has been made based on various studies on the composition of a 7 qwt% to 85 wt% NL-based high permeability magnetic alloy, with the aim of achieving both high magnetic properties and excellent hot workability and punchability. no r
It has been found that high magnetic properties and excellent hot workability and punching properties can be improved by 1q by containing ln and El and reducing the S, P, and C contents.
すなわち、この発明は、
Ｎｉ ７０ｗｔ％〜８５ｗｔ％、
Ｍｎ １．２Ｗｊ％〜１０ｗｔ％
Ｍｏ １．０ｗｔ％〜６．０ｗｔ％、
Ｂ ０．００２０ｗｔ％〜０．０１５ｗｔ％、Ｃ０．０
１ｗｔ％以下、Ｓ ０．００５ｗｔ％以下、Ｐ ０．０
１ｗｔ％以下、
あるいはざらに、磁気特性の改善を目的に、ＣＬＬ １
．０ｗｔ％〜６．０ｗｔ％、 Ｃｒ １．０ｗｔ％〜５
．０ｗｔ％のうち１種又は２種を含有し、
残部はＦ８及σ不可避的不純物とからなることを特徴と
する熱間加工性及び打抜き性のすぐれた高透磁率磁性合
金である。That is, this invention includes: Ni 70wt% to 85wt%, Mn 1.2Wj% to 10wt%, Mo 1.0wt% to 6.0wt%, B 0.0020wt% to 0.015wt%, C0.0
1wt% or less, S 0.005wt% or less, P 0.0
1wt% or less, or roughly, for the purpose of improving magnetic properties, CLL 1
．． 0wt%~6.0wt%, Cr 1.0wt%~5
．． It is a high permeability magnetic alloy with excellent hot workability and punchability, and is characterized by containing one or two of 0wt% and the remainder consisting of F8 and σ unavoidable impurities.
上記組成とすることにより、磁性焼鈍における冷却速度
条件に影響を受けず、すぐれた磁気特性を有し、かつ熱
間加工性及び打抜き性が改善され、熱間圧延時の耳割れ
９表面割れ疵などを低減できる効果を有する。By having the above composition, it is not affected by the cooling rate conditions in magnetic annealing, has excellent magnetic properties, and has improved hot workability and punching properties, resulting in less edge cracks and surface cracks during hot rolling. It has the effect of reducing problems such as
組成の限定理由
この発明において、Ｎｉを７０ｗｔ％〜８５ｗｔ％に限
定した理由は、該範囲を外れると合金内の規則格子の有
無にかかわらず、高透磁率が得られないためである。Reason for limiting the composition In this invention, the reason why Ni is limited to 70 wt% to 85 wt% is that high magnetic permeability cannot be obtained outside this range, regardless of the presence or absence of an ordered lattice in the alloy.
ｔ’Ｉｎは、磁気特性の改善と、磁気特性が焼鈍時の冷
却速度に対して敏感になるのを抑制するために添加含有
させるが、１ 、２ｗｔ％未満では、１ｑられる磁気特
性が該冷却速度に依存し、かつ磁気特性の改善効果がな
く、また、ｉｏｗｔ％を越える含有は、飽和磁束密度及
び透磁率が劣化して実用的でなくなるため、１ 、２ｗ
ｔ％〜１０ｗｔ％とする。t'In is added to improve the magnetic properties and to suppress the magnetic properties from becoming sensitive to the cooling rate during annealing, but if it is less than 1.2 wt%, the magnetic properties reduced by 1q will be lowered by the cooling rate. It depends on the speed and has no effect of improving magnetic properties, and if the content exceeds iowt%, the saturation magnetic flux density and magnetic permeability deteriorate and become impractical.
t% to 10wt%.
比は、ｉ 、 ｏｗｔ％未満では、合金内の規則格子生
成の抑制効果がなくなり、また、ｅ、ｏｗｔ％を越える
と、飽和磁束密度及び透磁率が劣化するため、１．０ｗ
ｔ％〜６．０ｗｔ％とする。If the ratio is less than i,wt%, there is no effect of suppressing the formation of ordered lattice in the alloy, and if it exceeds e,wt%, the saturation magnetic flux density and magnetic permeability will deteriorate;
t% to 6.0wt%.
Ｂは、この発明においｋ、熱間加工性及び打抜き性改善
のため添加するが、０．００２０ｗｔ％未満ではかかる
効果がなく、また、０．０１５ｗｔ％を越えると硼化物
が生成され、磁気特性が悪化し好ましくないため、０．
００２０ ｗｔ％〜０．０１５ｗｔ％の添加とする。In this invention, B is added to improve hot workability and punching properties, but if it is less than 0.0020 wt%, it has no such effect, and if it exceeds 0.015 wt%, borides are generated, which deteriorates the magnetic properties. 0.
0020 wt% to 0.015 wt% addition.
Ｃは、ｏ、ｏｉ ｗｔ％を越えると、熱間加工性、ｆｊ
ｉ気持性を劣化させ好ましくないため、０．０１ ｗｔ
％以下の含有とする。When C exceeds o, oi wt%, hot workability, fj
i 0.01 wt as it deteriorates the pleasantness and is undesirable.
% or less.
Ｓは、０．００５ｗｔ％を越えると、粒界に偏析して熱
間加工性、磁気特性を劣化させ好ましくないため、０．
００５ｗｔ％以下の含有とする。If S exceeds 0.005 wt%, it will segregate at grain boundaries and deteriorate hot workability and magnetic properties, which is undesirable.
The content shall be 0.05 wt% or less.
Ｐは、０．０１ ｗｔ％を越えると、粒界に偏析して熱
間加工性、磁気特性を劣化させ好ましくないため、０．
０１ ｗｔ％以下の含有とし、ざらに好ましくは０．０
０７ｗｔ％以下の含有でおる。If P exceeds 0.01 wt%, it will segregate at grain boundaries and deteriorate hot workability and magnetic properties, which is undesirable.
The content should be 0.01 wt% or less, preferably 0.0
The content is 0.7 wt% or less.
ＣＬＬは、規則格子の生成を抑制し、磁歪を調整する効
果を有するが、１．０ｗｔ３未満ではその効果が少なく
、また、６．０ｗｔ％を越えると飽和磁束密度及び透磁
率を低下させるため好ましくなく、１．０Ｗｊ％〜６．
０ｗｔ％の範囲の添加とする。CLL has the effect of suppressing the formation of regular lattices and adjusting magnetostriction, but if it is less than 1.0 wt%, the effect is small, and if it exceeds 6.0 wt%, it reduces the saturation magnetic flux density and magnetic permeability, so it is preferable. No, 1.0Wj%~6.
The addition range is 0 wt%.
Ｃｒは、ｔ、０ｗｔ３未満では耐食性が少なくなり、ま
た磁気特性の改善効果がなく、５．０ｗｔ％を越えると
飽和磁束密度、透磁率を劣化させるため、１．０ｗｔ％
〜ｓ、ｏｗｔ％の範囲とする。If Cr is less than t, 0wt3, the corrosion resistance will decrease and there will be no improvement effect on magnetic properties, and if it exceeds 5.0wt%, the saturation magnetic flux density and magnetic permeability will deteriorate, so Cr is 1.0wt%.
-s, owt% range.
実施例
実施例１
第１表に示す組成に真空溶解により溶製して得られた３
８ｍｍ厚みの平型鋳塊を、熱間圧延して５ｍｍ厚みＸ幅
１００ｍｍ寸法の熱延板となし、ざらに、冷間圧延して
板厚０．６ｍｍの冷延薄板となした後、外径４５ｍｍＸ
３３ｍｍのＪＩＳリングに打抜き、試料となした。Examples Example 1 3 obtained by vacuum melting the composition shown in Table 1
An 8 mm thick flat ingot was hot rolled into a hot rolled plate with dimensions of 5 mm thick x 100 mm wide, and then roughly cold rolled to form a cold rolled thin plate with a plate thickness of 0.6 mm. Diameter 45mm
A 33 mm JIS ring was punched out and used as a sample.
上記試料を、水素雰囲気中で、１１００’ＣＸ ３時間
の熱処理を施し、６００″Ｃまで炉冷したのち、急冷し
た場合の初透磁率と、１００℃／１１ｒで冷却した場合
の初透磁率を測定し、該熱間圧延後の熱延板の外観状況
、打抜き性とともに第２表に示す。The above sample was heat treated at 1100'CX for 3 hours in a hydrogen atmosphere, cooled in a furnace to 600'C, and the initial magnetic permeability when rapidly cooled and the initial magnetic permeability when cooled at 100°C/11r were calculated. The results are shown in Table 2 along with the appearance and punching properties of the hot rolled sheet after hot rolling.
外観状況は、３８ｍｍ厚みの平型鋳塊を、５ｍｍ厚みの
熱延板となした際の耳割れの大ぎざで評価し、熱延板と
なったときのトップ部、ミドル部、ボトム部の耳割れ深
さを測定し、トップ部、ミドル部、ボトム部の板幅１０
０＋ｎｍに対しての耳割れ深さの平均値にて示している
。The appearance condition was evaluated by the large serrations of the edges when a 38 mm thick flat ingot was made into a 5 mm thick hot rolled plate. Measure the depth of the ear crack and determine the board width of the top, middle and bottom parts by 10mm.
It is shown as the average value of the edge crack depth with respect to 0+nm.
また、打抜き性は、第１図に示す如く、試料（２）を載
置できる打抜き金型（１）を用いて、ポンチ（３）で打
抜き、その際のポンチ（３）ストロークｍを測定し、ポ
ンチストローク指数にて評価した。すなわち、ポンチス
トローク母を指数化し、指数が高いものは打抜き性が悪
く、逆に指数の低いものが打抜き、 性が良好である
ことを示している。In addition, the punching property was measured by punching with a punch (3) using a punch die (1) on which the sample (2) can be placed, as shown in Figure 1, and measuring the stroke m of the punch (3) at that time. , and was evaluated using the punch stroke index. That is, the punch stroke index is expressed as an index, and a high index indicates poor punching properties, while a low index indicates good punching properties.
以下余白 第２表Margin below Table 2
第１図は実施例における打ｖ；ｉき性試験に用いる打抜
き金型の斜視図である。
１・・・打抜き金型、２・・・試料、３・・・ポンチ。FIG. 1 is a perspective view of a punching die used for the punchability test in Examples. 1... Punching die, 2... Sample, 3... Punch.
Claims (1)
ｗｔ％以下、Ｓ０．００５ｗｔ％以下、Ｐ０．０１ｗｔ
％以下を含有し、 残部はＦｅ及び不可避的不純物とからなることを特徴と
する熱間加工性及び打抜き性のすぐれた高透磁率磁性合
金。 ２ Ｎｉ７０ｗｔ％〜８５ｗｔ％、 Ｍｎ１．２ｗｔ％〜１０ｗｔ％、 Ｍｏ１．０ｗｔ％〜６．０ｗｔ％、 Ｂ０．００２０ｗｔ％〜０．０１５ｗｔ％、Ｃ０．０１
ｗｔ％以下、Ｓ０．００５ｗｔ％以下、Ｐ０．０１ｗｔ
％以下、さらに、 Ｃｕ１．０ｗｔ％〜６．０ｗｔ％、Ｃｒ１．０ｗｔ％〜
５．０ｗｔ％のうち１種又は２種を含有し、 残部はＦｅ及び不可避的不純物とからなることを特徴と
する熱間加工性及び打抜き性のすぐれた高透磁率磁性合
金。[Claims] 1 Ni70wt%~85wt%, Mn1.2wt%~10wt%, Mo1.0wt%~6.0wt%, B0.0020wt%~0.015wt%, C0.01
wt% or less, S0.005wt% or less, P0.01wt
% or less, and the remainder is Fe and unavoidable impurities. A high permeability magnetic alloy with excellent hot workability and punchability. 2 Ni70wt%~85wt%, Mn1.2wt%~10wt%, Mo1.0wt%~6.0wt%, B0.0020wt%~0.015wt%, C0.01
wt% or less, S0.005wt% or less, P0.01wt
% or less, further Cu1.0wt%~6.0wt%, Cr1.0wt%~
A high permeability magnetic alloy with excellent hot workability and punchability, characterized in that it contains one or two of 5.0wt% of Fe and the remainder consists of Fe and unavoidable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61071448A JPS62227053A (en) | 1986-03-28 | 1986-03-28 | High permeability magnetic alloy excellent in workability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61071448A JPS62227053A (en) | 1986-03-28 | 1986-03-28 | High permeability magnetic alloy excellent in workability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62227053A true JPS62227053A (en) | 1987-10-06 |
Family
ID=13460844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61071448A Pending JPS62227053A (en) | 1986-03-28 | 1986-03-28 | High permeability magnetic alloy excellent in workability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62227053A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4935201A (en) * | 1988-05-13 | 1990-06-19 | Nkk Corporation | Ferromagnetic Ni-Fe alloy, and method for manufacturing alloy article having excellent surface quality of said alloy |
| US4948434A (en) * | 1988-04-01 | 1990-08-14 | Nkk Corporation | Method for manufacturing Ni-Fe alloy sheet having excellent DC magnetic property and excellent AC magnetic property |
| EP0407608A1 (en) * | 1989-01-20 | 1991-01-16 | Nkk Corporation | Nickel-iron base magnetic alloy having high permeability |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS532404A (en) * | 1976-06-28 | 1978-01-11 | Takeda Chem Ind Ltd | Elimination of thiol protectors |
| JPS60159157A (en) * | 1984-01-30 | 1985-08-20 | Nippon Yakin Kogyo Co Ltd | Fe-ni alloy having excellent hot workability |
-
1986
- 1986-03-28 JP JP61071448A patent/JPS62227053A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS532404A (en) * | 1976-06-28 | 1978-01-11 | Takeda Chem Ind Ltd | Elimination of thiol protectors |
| JPS60159157A (en) * | 1984-01-30 | 1985-08-20 | Nippon Yakin Kogyo Co Ltd | Fe-ni alloy having excellent hot workability |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4948434A (en) * | 1988-04-01 | 1990-08-14 | Nkk Corporation | Method for manufacturing Ni-Fe alloy sheet having excellent DC magnetic property and excellent AC magnetic property |
| US4935201A (en) * | 1988-05-13 | 1990-06-19 | Nkk Corporation | Ferromagnetic Ni-Fe alloy, and method for manufacturing alloy article having excellent surface quality of said alloy |
| EP0407608A1 (en) * | 1989-01-20 | 1991-01-16 | Nkk Corporation | Nickel-iron base magnetic alloy having high permeability |
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