JPH0762256B2 - Manufacturing method of grain-oriented electrical steel sheet with excellent punchability - Google Patents
Manufacturing method of grain-oriented electrical steel sheet with excellent punchabilityInfo
- Publication number
- JPH0762256B2 JPH0762256B2 JP20008788A JP20008788A JPH0762256B2 JP H0762256 B2 JPH0762256 B2 JP H0762256B2 JP 20008788 A JP20008788 A JP 20008788A JP 20008788 A JP20008788 A JP 20008788A JP H0762256 B2 JPH0762256 B2 JP H0762256B2
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- grain
- oriented electrical
- annealing
- coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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
- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
- C21D3/02—Extraction of non-metals
- C21D3/04—Decarburising
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
- C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
-
- 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1277—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
- C21D8/1283—Application of a separating or insulating coating
-
- 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the heat treatment
- C21D8/1255—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the heat treatment with diffusion of elements, e.g. decarburising, nitriding
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Electromagnetism (AREA)
- Chemical Treatment Of Metals (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、打抜き性が極めてすぐれた方向性電磁鋼板の
製造法に関する。TECHNICAL FIELD The present invention relates to a method for producing a grain-oriented electrical steel sheet having excellent punchability.
（従来の技術） 方向性電磁鋼板は一般に次のようにして製造される。即
ちSiを4.0％以下含有する珪素鋼スラブを熱間圧延し、
焼鈍してあるいは焼鈍せずに１回または中間焼鈍を挟ん
で２回以上の冷間圧延を施して最終板厚とし、脱炭焼鈍
を行って鋼板表面にSiO2を含む酸化膜を生成させ、次い
でMgOを主な成分とする焼鈍分離剤を塗布して乾燥して
コイルに巻き取り、その後、高温の仕上焼鈍を行ないゴ
ス方位の２次再結晶粒を発達させるとともに、グラス被
膜を形成させ、次いで必要に応じて絶縁コーティング液
を塗布し焼付熱処理を行って絶縁コーティング被膜を形
成させる。(Prior Art) A grain-oriented electrical steel sheet is generally manufactured as follows. That is, hot rolling a silicon steel slab containing Si 4.0% or less,
With or without annealing, cold rolling is performed once or twice or more with intervening intermediate annealing to obtain a final thickness, and decarburization annealing is performed to form an oxide film containing SiO 2 on the surface of the steel sheet. Next, apply an annealing separator containing MgO as the main component, dry and wind it into a coil, and then perform high-temperature finishing annealing to develop secondary recrystallized grains in the Goss direction and form a glass film. Next, if necessary, an insulating coating solution is applied and baking heat treatment is performed to form an insulating coating film.
方向性電磁鋼板は発電機、変圧器などの電気機器の鉄心
材料として用いられるが、鉄心は通常金型で打抜かれ、
あるいは剪断により、所定形状とされた鉄心単板を多数
枚積層して製作される。例えばタービン発電機の鉄心を
製作するにはその容量にもよるが鉄心単板を10〜20万枚
程度も要する。これら鉄心単板は打抜き返りが小さいこ
と、例えば30μｍ以下であることが、当該鉄心単板を積
層した場合、鉄心の端面短絡による鉄損の異常増加防止
に対して重要である。また鉄心製作加工を容易とするた
めにも打抜き返りが小さいことが望まれる。The grain-oriented electrical steel sheet is used as an iron core material for electric devices such as generators and transformers, but the iron core is usually punched with a die,
Alternatively, it is manufactured by laminating a plurality of iron core single plates having a predetermined shape by shearing. For example, manufacturing a core of a turbine generator requires about 100,000 to 200,000 single core plates, depending on its capacity. It is important for these iron core veneers that the punching back is small, for example, 30 μm or less, in order to prevent an abnormal increase in iron loss due to an end face short circuit of the iron core when the iron core veneers are laminated. Further, it is desired that the punching back be small in order to facilitate the iron core manufacturing process.
方向性電磁鋼板にはグラス被膜あるいは該被膜と絶縁コ
ーティング被膜の２重の絶縁被膜が形成されている。グ
ラス被膜は鋼板に張力を与えて鉄損を低下させる作用が
あるが、反面、硬質であるために打抜きを行なう際、金
型を摩耗せしめる。このため例えば数1000回打抜くと、
打抜き返りが所定値以上発生し、金型の再研磨あるいは
新品との取替えを行わなければならない。これは作業性
を著しく低下させ、またコスト上昇などを招くことにな
る。On the grain-oriented electrical steel sheet, a glass coating or a double insulating coating of the coating and an insulating coating is formed. The glass coating has a function of applying tension to the steel sheet to reduce iron loss, but on the other hand, it is hard and therefore wears the die during punching. Therefore, for example, if you punch a few thousand times,
If punching back occurs more than a predetermined value, it is necessary to re-polish the die or replace it with a new one. This significantly lowers the workability and raises the cost.
打抜き性を高めるために、グラス被膜の生成を抑制した
方向性電磁鋼板の製造方法が提案されている。例えば特
開昭53−22113号公報記載の方法は脱炭焼鈍で形成する
電磁鋼板表面の酸化膜厚みを３μｍ以下とし、焼鈍分離
剤として、含水珪酸塩鉱物粉末を配合した微粒子のアル
ミナを用いて鋼板に塗布し仕上焼鈍している。かくして
酸化膜の薄目付きと含水珪酸塩鉱物粉末の配合によって
剥離しやすいグラス被膜を鋼板表面に形成して、打抜き
性の向上を図っている。また特開昭59−96278号公報記
載の方法では焼鈍分離剤として、粒度の大きさが10μｍ
以下の微粒子アルミナと1300℃以上の高温で焼成した不
活性MgOを用いることにより、鋼板表面の酸化膜との反
応を抑制して、グラス被膜の形成を防ぐことが提案され
ている。アルミナは酸化膜中のSiO2との反応性が弱いの
で、打抜き性向上にそれなりの効果が奏される。In order to improve the punching property, a method for producing a grain-oriented electrical steel sheet in which the formation of a glass coating is suppressed has been proposed. For example, in the method described in JP-A-53-22113, the thickness of the oxide film on the surface of a magnetic steel sheet formed by decarburization annealing is 3 μm or less, and fine particles of alumina containing hydrous silicate mineral powder are used as an annealing separator. It is applied to steel plates and finish annealed. In this way, the glass film that is easy to peel off is formed on the surface of the steel sheet by the combination of the thin oxide film and the hydrated silicate mineral powder to improve the punchability. Further, according to the method described in JP-A-59-96278, the annealing separator has a particle size of 10 μm.
It has been proposed to suppress the reaction with the oxide film on the surface of the steel sheet and prevent the formation of a glass coating by using the following fine particle alumina and inert MgO that has been fired at a high temperature of 1300 ° C. or higher. Since alumina has a weak reactivity with SiO 2 in the oxide film, it has some effect in improving the punchability.
（発明が解決しようとする課題） これらの提案により、方向性電磁鋼板の表面のグラス被
膜の生成が防止され、金属光沢を有する方向性電磁鋼板
が得られ、斯くして打抜き性の改善が図られている。し
かし実操業ラインでは例えば脱炭焼鈍では雰囲気ガスの
露点、組成が変化することがあり、あるいは温度偏差等
により鋼板表面に形成される酸化膜は部分的に厚み差が
生じる。これがグラス被膜の剥離性や、被膜形成抑制状
態に影響を及ぼし、打抜き性は十分に満足し得るまでに
良好であるとは言い難い。(Problems to be Solved by the Invention) With these proposals, the formation of a glass coating on the surface of a grain-oriented electrical steel sheet is prevented, and a grain-oriented electrical steel sheet having a metallic luster is obtained, thus improving the punchability. Has been. However, in the actual operation line, for example, decarburization annealing may change the dew point and composition of the atmosphere gas, or the oxide film formed on the surface of the steel sheet may have a difference in thickness due to temperature deviation or the like. This affects the releasability of the glass film and the state of suppressing the film formation, and the punching property cannot be said to be sufficiently satisfactory.
本発明は打抜き性が著しく優れており、かつ極めて多数
回の打抜きに際しても金型に摩耗を生ぜしめることのな
い方向性電磁鋼板の製造方法を提供することを目的とす
る。An object of the present invention is to provide a method for producing a grain-oriented electrical steel sheet which has excellent punching properties and which does not cause wear on the die even when punching a large number of times.
（課題を解決するための手段） 本発明の要旨とするところは、金属光沢面を有する方向
性電磁鋼板を平坦化焼鈍する前に、鋼板表面に無機系コ
ーティングを施し、平坦化焼鈍し、その後有機系コーテ
ィングまたは有機系と無機系を混じえたコーティングを
施すことを特徴とする打抜き性が極めてすぐれた方向性
電磁鋼板の製造法にある。(Means for Solving the Problems) The gist of the present invention is that, before flattening and annealing a grain-oriented electrical steel sheet having a metallic glossy surface, an inorganic coating is applied to the steel sheet surface, and then flattening and annealing, and then This is a method for producing a grain-oriented electrical steel sheet with extremely excellent punchability, which is characterized by applying an organic coating or a coating in which an organic and an inorganic mixture are mixed.
以下に本発明について詳細に説明する。The present invention will be described in detail below.
本発明者達は方向性電磁鋼板の打抜き性を向上させるた
めに実験し、検討した。そして先に特願昭62−215224号
にて仕上焼鈍の焼鈍分離剤にアルカリ金属またはアルカ
リ土類金属の塩化物の１種又は２種以上を２〜40重量％
配合したものを用いて、鋼表面のグラス被膜生成を防止
し、金属光沢を有する方向電磁鋼板の製造法を提案し
た。さらに検討したところ、方向性電磁鋼板は仕上焼鈍
後に板形状矯正のために平坦化焼鈍が行なわれるが、こ
の際金属光沢面は雰囲気を極力ドライに保っても鋼板表
面に酸化層を形成し、この酸化層が打抜き性及び磁気特
性の劣化をもたらすことが確かめられた。The present inventors conducted experiments and studies to improve the punchability of grain-oriented electrical steel sheets. And, in Japanese Patent Application No. 62-215224, 2-40% by weight of one or more kinds of chlorides of alkali metal or alkaline earth metal is added to the annealing separator for finish annealing.
We proposed a method for producing grain-oriented electrical steel sheets with metallic luster by preventing the formation of glass film on the steel surface by using the blended materials. Upon further study, the grain-oriented electrical steel sheet is subjected to flattening annealing to correct the sheet shape after finish annealing, but at this time, the metallic glossy surface forms an oxide layer on the steel sheet surface even if the atmosphere is kept as dry as possible, It was confirmed that this oxide layer resulted in deterioration of punchability and magnetic properties.
この阻害要因をなくすべく、実験した結果、本発明が構
成されたものである。すなわち、金属光沢面を有する方
向性電磁鋼板を平坦化焼鈍する前に、鋼板表面に無機系
コーティングを施し、平坦化焼鈍を行ない、しかる後、
有機系コーティングまたは有機系と無機系を混じえたコ
ーティングを施すことにより、打抜き性が著しく向上す
る他、良好な磁気特性が得られる。The present invention has been constructed as a result of an experiment to eliminate this inhibiting factor. That is, before the flattening annealing of the grain-oriented electrical steel sheet having a metallic glossy surface, an inorganic coating is applied to the steel sheet surface, and the flattening annealing is performed.
By applying an organic coating or a mixture of an organic and an inorganic coating, the punchability is remarkably improved and good magnetic properties are obtained.
前記の如く、本発明により打抜き性が著しく向上する理
由は、鋼板表面に無機系コーティングを施して平坦化焼
鈍を行うことによって、打抜き性の劣化をもたらす阻害
要因である酸化層の生成が防止されるからであり、この
ことは後記の実施例により実証されている。As described above, the reason why the punching property is remarkably improved by the present invention is that the formation of an oxide layer, which is an inhibiting factor that causes deterioration of the punching property, is prevented by applying an inorganic coating on the surface of the steel sheet and performing flattening annealing. This is demonstrated by the examples described below.
本発明が適用される方向性電磁鋼板の成分組成および仕
上焼鈍終了までのプロセスについては特定する必要はな
い。It is not necessary to specify the component composition of the grain-oriented electrical steel sheet to which the present invention is applied and the process up to the end of finish annealing.
即ち、Siを4.0％以下含有しインヒビター形成元素ある
いは粒界に偏折し２次再結晶を発現せしめる成分を含ん
だ電磁鋼スラブを、熱間圧延し、焼鈍し、あるいは焼鈍
せずに１回または中間焼鈍をはさんで２回以上の冷間圧
延にて最終板厚とし、脱炭焼鈍する。次いで焼鈍分離剤
を塗布して仕上焼鈍するが、焼鈍分離剤は鋼板表面のSi
O2を含む酸化膜と反応せずにグラス被膜を形成しないも
の、例えばMgO 100重量部に対してアルカリ金属または
アルカイ土類金属の塩化物を２〜40重量部配合したもの
が用いられる。剥離しやすいグラス被膜を形成せしめる
微粒子アルミナを用いてもよい。That is, an electromagnetic steel slab containing Si in an amount of 4.0% or less and containing an inhibitor-forming element or a component that causes a secondary recrystallization by being biased to grain boundaries is hot-rolled, annealed, or once without annealing. Alternatively, decarburization annealing is performed by cold rolling two or more times with intermediate annealing in between to obtain the final plate thickness. Then, an annealing separator is applied and finish annealing is performed.
A material that does not react with an oxide film containing O 2 to form a glass film, for example, a material in which 2 to 40 parts by weight of a chloride of an alkali metal or an alkaline earth metal is mixed with 100 parts by weight of MgO is used. You may use the fine particle alumina which forms the glass film which peels easily.
要するに焼鈍分離剤はグラス被膜の形成抑制あるいは剥
離性を良くするものであれば、いずれでもよい。In short, the annealing separating agent may be any as long as it suppresses the formation of the glass film or improves the releasability.
仕上焼鈍後、グラス被膜が残存していれば、酸洗などに
よって除去しても構わない。After finishing annealing, if the glass coating remains, it may be removed by pickling or the like.
次いで金属光沢面を有する方向性電磁鋼板は平坦化焼鈍
される。この焼鈍において、本発明では鋼板に酸化膜が
生じるのを防止し、打抜き性を一段と高めるように、平
坦化焼鈍前に金属光沢鋼板表面に無機系コーティング剤
を塗布する。例えば、リン酸，リン酸アルミニウム、リ
ン酸マグネシウム，リン酸カルシウム，リン酸亜鉛，リ
ン酸マンガン等のリン酸塩、クロム酸、クロム酸マグネ
シウム，クロム酸アルミニウム，クロム酸カルシウム，
クロム酸亜鉛等のクロム酸塩，重クロム酸塩，コロイダ
ルシリカの１種または２種以上を塗布する。その塗布量
は0.5〜2.5g/m2とすることが好ましい。また無機系コー
ティングにはホウ酸、ホウ酸塩、ケイ酸塩が添加されて
いてもよい。Then, the grain-oriented electrical steel sheet having a metallic glossy surface is flattened and annealed. In this annealing, in the present invention, an inorganic coating agent is applied to the surface of the metallic glossy steel sheet before the flattening annealing so as to prevent an oxide film from being formed on the steel sheet and further improve the punching property. For example, phosphates such as phosphoric acid, aluminum phosphate, magnesium phosphate, calcium phosphate, zinc phosphate, manganese phosphate, chromic acid, magnesium chromate, aluminum chromate, calcium chromate,
One or more of chromate such as zinc chromate, dichromate and colloidal silica are applied. The coating amount is preferably 0.5 to 2.5 g / m 2 . Boric acid, borate, and silicate may be added to the inorganic coating.
無機系コーティングを塗布した後、平坦化焼鈍を800〜8
70℃で行なう。この温度は鋼板の形状を矯正するために
決められるものである。本発明では前記コーティングが
鋼板に付着したいるので、雰囲気ガスによって全く酸化
されず、打抜き性が高められるとともに磁気特性も良好
となる。After applying the inorganic coating, 800-8 flattening annealing
Perform at 70 ° C. This temperature is determined to correct the shape of the steel sheet. In the present invention, since the coating is adhered to the steel sheet, it is not oxidized at all by the atmospheric gas, the punchability is enhanced and the magnetic properties are improved.
次いで、有機系絶縁コーティングまたは有機系無機系を
混じえた絶縁コーティングが塗布され、例えば250〜350
℃にて焼付けられ、絶縁被覆が形成される。有機系コー
ティングとしては例えばアクリル系，スチレン，ポリビ
ニール，メラミン，フェノール，シリコン，酢酸ビニー
ル，エポキシ系等が用いられる。之等の有機系コーティ
ングのみによっても方向性電磁鋼板の打抜き性は良好と
なるが、本発明に従いに、無機系コーティングにより酸
化膜の発生を防止したうえに、有機系コーティングまた
は有機系コーティングに前記無機系コーティング剤を混
じえたコーティングを塗布し焼付けた方向性電磁鋼板は
打抜き性が飛躍的に向上する。Then, an organic insulating coating or an insulating coating mixed with an organic inorganic coating is applied, for example, 250 to 350.
Baked at ° C to form an insulating coating. As the organic coating, for example, acrylic, styrene, polyvinyl, melamine, phenol, silicone, vinyl acetate, epoxy, etc. are used. Although the punching property of the grain-oriented electrical steel sheet is improved by only these organic coatings, according to the present invention, the inorganic coating prevents the generation of an oxide film, and the organic coating or the organic coating is The punching properties of the grain-oriented electrical steel sheet coated with an inorganic coating agent and baked are dramatically improved.
次に実施例について述べる。Next, examples will be described.
実施例 重量％でC:0.04％,Si:3.1％,Mn:0.06％,S:0.02％,Al:0.
001％,N:0.005％残部が鉄および不可避的不純物からな
るスラブを1400℃で加熱し、2.1mmの熱延コイルに仕上
げた後、酸洗を行ない、0.75mm迄一次冷延を行い、950
℃×60秒の中間焼鈍を行い、0.35mmまで最終冷延を行
う。次いで840℃で脱炭焼鈍を行い、10％（重量％）のC
aCl2を含んだMgOを塗布し、仕上焼鈍を実施した。Example C: 0.04% by weight%, Si: 3.1%, Mn: 0.06%, S: 0.02%, Al: 0.
001%, N: 0.005% Heat the slab consisting of iron and inevitable impurities at 1400 ° C, finish the hot rolled coil to 2.1mm, pickle it, and perform the primary cold rolling to 0.75mm.
Intermediate annealing at ℃ × 60 seconds, and finally cold rolling to 0.35mm. Then, decarburization annealing is performed at 840 ° C and 10% (wt%) of C
MgO containing aCl 2 was applied and finish annealing was performed.
その後、鋼板表面のMgOを水洗した後、以下の４条件
で、平坦化焼鈍（850℃×90秒）と絶縁被膜コーティン
グ処理（300℃×10秒）を行なった。After that, MgO on the surface of the steel sheet was washed with water, and then flattening annealing (850 ° C. × 90 seconds) and insulating film coating treatment (300 ° C. × 10 seconds) were performed under the following four conditions.
（条件１）リン酸アルミニウム系の無機コーティングを
＊2g/m2の量で塗布し、次いで平坦化焼鈍を行なった。
（＊乾燥後重量） （条件２）N2 98％＋H2 2％のドライ雰囲気中で平坦化
焼鈍を行ない、しかる後、リン酸マグネシウムをベース
に有機質アクリルスチレンを含んだ有機系コーティング
を2g/m2の量で塗布し焼付処理。(Condition 1) Aluminum phosphate based inorganic coating
* Applied in an amount of 2 g / m 2 , followed by flattening annealing.
( * Weight after drying) (Condition 2) Flattening annealing was performed in a dry atmosphere of N 2 98% + H 2 2%, and then 2 g / g of organic coating containing organic acrylic styrene based on magnesium phosphate. It is applied in an amount of m 2 and baked.
（条件３）条件１の後、リン酸マグネシウムをベースに
有機質アクリルスチレンを含んだ有機系コーティングを
2g/m2の量で塗布し焼付処理。(Condition 3) After the condition 1, apply an organic coating containing organic acrylic styrene based on magnesium phosphate.
Apply 2g / m 2 and bake.
（条件４）条件１の後、有機系のエポキシ樹脂を2g/m2
の量で塗布し焼付処理。(Condition 4) After condition 1, add 2 g / m 2 of organic epoxy resin.
And baking treatment.
得られた鋼板について打抜き性と磁気特性を試験し、そ
の結果を第１表に示す。The obtained steel sheet was tested for punching properties and magnetic properties, and the results are shown in Table 1.
（発明の効果） この結果から明らかなように、本発明によると打抜き返
り高さが所定値になるまでの打抜き回数が71〜75万回と
非常に多く、打抜き性が極めてすぐれた方向性電磁鋼板
を提供することが出来る。 (Effect of the invention) As is clear from this result, according to the present invention, the number of punches until the punching back height reaches a predetermined value is as large as 7 to 750,000, and the punching property is extremely excellent in directional electromagnetic. We can provide steel sheets.
Claims (1)
化焼鈍する前に、鋼板表面に無機系コーティングを施
し、平坦化焼鈍し、その後有機系コーティングまたは有
機系と無機系を混じえたコーティングを施すことを特徴
とする打抜き性が極めてすぐれた方向性電磁鋼板の製造
法。1. Prior to flattening annealing a grain-oriented electrical steel sheet having a metallic glossy surface, an inorganic coating is applied to the surface of the steel sheet, followed by flattening annealing, and then an organic coating or a coating containing a mixture of organic and inorganic systems. A method for producing a grain-oriented electrical steel sheet with excellent punching properties, which is characterized by applying
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20008788A JPH0762256B2 (en) | 1988-08-02 | 1988-08-12 | Manufacturing method of grain-oriented electrical steel sheet with excellent punchability |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19329788 | 1988-08-02 | ||
| JP63-193297 | 1988-08-02 | ||
| JP20008788A JPH0762256B2 (en) | 1988-08-02 | 1988-08-12 | Manufacturing method of grain-oriented electrical steel sheet with excellent punchability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02138479A JPH02138479A (en) | 1990-05-28 |
| JPH0762256B2 true JPH0762256B2 (en) | 1995-07-05 |
Family
ID=26507793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20008788A Expired - Fee Related JPH0762256B2 (en) | 1988-08-02 | 1988-08-12 | Manufacturing method of grain-oriented electrical steel sheet with excellent punchability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0762256B2 (en) |
-
1988
- 1988-08-12 JP JP20008788A patent/JPH0762256B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02138479A (en) | 1990-05-28 |
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