JP2000309823A - Production of hot rolled silicon steel sheet uniform in magnetic property - Google Patents

Production of hot rolled silicon steel sheet uniform in magnetic property

Info

Publication number
JP2000309823A
JP2000309823A JP11639199A JP11639199A JP2000309823A JP 2000309823 A JP2000309823 A JP 2000309823A JP 11639199 A JP11639199 A JP 11639199A JP 11639199 A JP11639199 A JP 11639199A JP 2000309823 A JP2000309823 A JP 2000309823A
Authority
JP
Japan
Prior art keywords
hot
rolling
sheet
controlled
steel sheet
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.)
Withdrawn
Application number
JP11639199A
Other languages
Japanese (ja)
Inventor
Ryutaro Kawamata
竜太郎 川又
Takeshi Kubota
猛 久保田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP11639199A priority Critical patent/JP2000309823A/en
Publication of JP2000309823A publication Critical patent/JP2000309823A/en
Withdrawn legal-status Critical Current

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Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

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  • Manufacturing Of Steel Electrode Plates (AREA)

Abstract

PROBLEM TO BE SOLVED: To obtain a steel sheet excellent in magnetic properties in the longitudinal direction of a coil by subjecting a slab contg. Si or/and Mn in specified compositional ranges, and the balance Fe to rough rolling to form into a sheet bar and executing finish hot rolling in which the finishing temp. is controlled to a specified range, the finishing sheet thickness is controlled to the value equal to or below a specified one, the maximum value of a parameter in the final pass is controlled to the specified one below a specified value, and the varying range is controlled to the value equal to or below a specified one. SOLUTION: The contents of Si and Mn are controlled to, by weight, 0.1<=Si<=4.0, and 0.1<=Mn<=2.0, the finishing temp. is controlled to 750 to 1150 deg.C, and the finishing sheet thickness is controlled to <=1.5 mm. The maximum value of the parameter Z defined by the formula ε: strain rate (1/s) and t: rolling temp. ( deg.C)} in the final pass is controlled to <16.0, and the varying range is controlled to <=2.0. For obtaining low core loss in particular, preferably 0.1 to 1.5 wt.% sol-Al is added. A sheet bar obtd. by subjecting the slab to rough rolling is coiled, is held for a certain time and is thereafter recoiled, the preceding and succeeding sheet bars are joined, and the plural sheet bars are integrated, which is continuously subjected to finish hot rolling.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、電気機器の鉄心材
料として用いられる熱延珪素鋼板の磁気特性の均一な製
造方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a hot-rolled silicon steel sheet having a uniform magnetic property, which is used as an iron core material of electric equipment.

【0002】[0002]

【従来の技術】近年、電気機器、特に無方向性電磁鋼板
がその鉄心材料として使用される回転機および中、小型
変圧器等の分野においては、世界的な電力、エネルギー
節減、さらにはフロンガス規制等の地球環境保全の動き
の中で、高効率化の動きが急速に広まりつつある。この
ため、無方向性電磁鋼板に対しても、その特性向上、す
なわち、高磁束密度かつ低鉄損化への要請がますます強
まってきている。このため無方向性電磁鋼板を製造する
側としては、この様な優れた特性を持つ無方向性電磁鋼
板を安定して製造する使命が課せられているが、以下に
述べるように現状の技術では十分に対処しているとは言
えない。
2. Description of the Related Art In recent years, in the fields of electric machines, especially rotating machines and medium-sized and small-sized transformers in which non-oriented electrical steel sheets are used as iron core materials, worldwide electric power and energy savings, as well as chlorofluorocarbon gas regulations. Among the movements for global environmental conservation, such as the above, the movement for higher efficiency is rapidly spreading. Therefore, there is an increasing demand for non-oriented electrical steel sheets to have improved properties, that is, high magnetic flux density and low iron loss. For this reason, on the side of manufacturing non-oriented electrical steel sheets, the mission of stably producing non-oriented electrical steel sheets with such excellent characteristics is imposed, but as described below, with the current technology, Not enough.

【0003】無方向性電磁鋼板の長手方向の磁気特性の
変動の一例であるスキッドマークを改善する手段とし
て、特開平8−92643には、シートバーを巻取り、
一定時間保持した後に巻きほどいて圧延する技術が公開
されている。この技術は確かにスキッドマークの改善に
一定の効果をもたらすが、その効果は十分であるとは言
えない。また、連続するシートバー毎に圧延を行ってい
くと、1本のシートバーの中で圧延温度、圧延速度が変
動するため、コイル長手方向の磁気変動は避けがたく、
成品歩留まりの低下を招く難点があったが、制御熱延条
件をどのように設定することが有効であるかが未知の課
題であった。
Japanese Patent Application Laid-Open No. 8-92643 discloses a method of improving a skid mark, which is an example of a change in magnetic properties in the longitudinal direction of a non-oriented electrical steel sheet.
A technique of unwinding and rolling after holding for a certain time has been disclosed. Although this technique does have some effect on skid mark improvement, its effect is not sufficient. In addition, when rolling is performed for each continuous sheet bar, the rolling temperature and rolling speed fluctuate within one sheet bar, so that magnetic fluctuation in the coil longitudinal direction is inevitable.
Although there was a difficulty in lowering the product yield, it was an unknown issue how to set the control hot rolling conditions effectively.

【0004】この問題を解決するために特開平8−17
6664号公報では仕上圧延時の最終スタンドのロール
周速が磁気特性に影響を及ぼすことを開示し、その周速
の変動を一定以内に制限する技術を提案している。しか
しながら、発明者等がコイル長手方向の磁気特性の変動
について詳細に調査を行った結果、仕上熱延の最終スタ
ンドの周速は冶金学的に見てもそれそのものが金属組
織、析出物に影響を与えるものでなく、公開された図中
の周速に対する磁束密度依存性は、ローカルな条件でし
かないことがわかった。すなわち、異なる熱延機や異な
る仕上げ圧延温度での無方向性電磁鋼板の磁気特性を最
終スタンドの周速のみで制御することは不可能であるこ
とが分かった。
In order to solve this problem, Japanese Patent Laid-Open No.
No. 6664 discloses that the peripheral speed of the roll of the final stand at the time of finish rolling affects the magnetic properties, and proposes a technique for limiting the fluctuation of the peripheral speed within a certain range. However, as a result of a detailed investigation conducted by the inventors on variations in the magnetic properties in the longitudinal direction of the coil, the peripheral speed of the final stand of the hot-rolled finish itself, even from a metallurgical point of view, has an effect on the metal structure and precipitates. It was found that the dependence of the magnetic flux density on the peripheral speed in the published figure was only a local condition. That is, it was found that it was impossible to control the magnetic properties of the non-oriented electrical steel sheet at different hot rolling mills and different finish rolling temperatures only by the peripheral speed of the final stand.

【0005】また、低コスト無方向性電磁鋼板を提供す
る手段として、特開平9−194939号公報には、粗
熱間圧延後、シートバーを巻取り均熱処理を施した後、
板厚1mm以下のホットファイナル無方向性電磁鋼板を製
造する技術が開示されている。しかしながらシートバー
の巻取りによるシートバー自身の均熱化のみで薄手熱延
板を安定製造することには限界があり、薄手材を製造し
た場合に、仕上熱延の圧下率が増大することからシート
バー噛み込み時にスタンド間で上反りが生じやすく、結
果として圧延を停止せざるを得なかった。また、仕上熱
延の圧下率低減のためにシートバーを薄手化すると、シ
ートバー巻取りを行ったとしても、シートバーの温度む
ら生じるため、成品の特性がコイル採取位置に対して安
定せず、限界があった。この様に、薄手ホットファイナ
ル無方向性電磁鋼板の製造には大きな課題を残してい
た。
[0005] As means for providing a low-cost non-oriented electrical steel sheet, Japanese Patent Application Laid-Open No. 9-194939 discloses that after rough hot rolling, a sheet bar is wound and subjected to a soaking heat treatment.
A technique for producing a hot final non-oriented electrical steel sheet having a thickness of 1 mm or less is disclosed. However, there is a limit to the stable production of thin hot rolled sheets only by soaking the sheet bar itself by winding the sheet bar, and when thin materials are manufactured, the rolling reduction of the finished hot rolling increases. When the sheet bar is engaged, warpage is likely to occur between stands, and as a result, rolling has to be stopped. Also, if the sheet bar is made thinner to reduce the rolling reduction of the hot rolled finish, even if the sheet bar is wound up, the temperature of the sheet bar will be uneven, and the characteristics of the product will not be stable with respect to the coil sampling position. There was a limit. Thus, the production of thin hot-final non-oriented electrical steel sheets has left a major problem.

【0006】[0006]

【発明が解決しようとする課題】この点に鑑みて発明者
等は鋭意検討を行った結果、仕上圧延時の最終スタンド
の圧延条件を、特定の式で定められる条件に制御するこ
とにより、コイル長手方向の磁気特性が著しく安定する
ことを見出し、先述の問題の解決に至った。
In view of this point, the present inventors have made intensive studies and as a result, by controlling the rolling conditions of the final stand at the time of finish rolling to conditions determined by a specific formula, The inventors have found that the magnetic properties in the longitudinal direction are remarkably stable, and have solved the above-mentioned problem.

【0007】さらに、この技術を容易にする方策とし
て、圧延後のシートバーを巻きとって保持し、これを巻
きほどいて圧延することでシートバーの先頭と最後尾を
反転させ、圧延温度を均一ならしめると共に、さらにそ
のシートバーを先行するシートバーに接合して複数のシ
ートバーを連続して圧延に供することにより、式(1)
で定義されるZパラメーターをさらに安定して制御し、
コイル長手方向の磁気特性がより均一な熱延珪素鋼板を
製造することが可能であることを見出し、発明の完成に
至った。
Further, as a measure for facilitating this technique, a rolled sheet bar is wound and held, and then unrolled and rolled, thereby inverting the head and tail of the sheet bar to make the rolling temperature uniform. In addition, the sheet bar is joined to the preceding sheet bar and a plurality of sheet bars are continuously subjected to rolling, whereby the formula (1) is obtained.
Control more stably the Z parameter defined by
The inventors have found that it is possible to produce a hot-rolled silicon steel sheet having more uniform magnetic properties in the coil longitudinal direction, and have completed the invention.

【0008】本発明は、無方向性電磁鋼板製造法におい
て、従来技術での限界を打破して、コイル長手方向の磁
気特性の優れた無方向性電磁鋼板を安定して熱間圧延に
て製造する技術を提供せんとするものである。
The present invention provides a method of manufacturing a non-oriented electrical steel sheet, which overcomes the limitations of the prior art and stably produces a non-oriented electrical steel sheet having excellent magnetic properties in the longitudinal direction of the coil by hot rolling. To provide the technology to do so.

【0009】[0009]

【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、以下の通りである。 (1) 重量%で、0.1%≦Si≦4.0%と、0.
1%≦Mn≦2.0%との一方若しくは双方を含有し、
残部がFeおよび不可避不純物からなるスラブに粗圧延
を施してシートバーとし、次いで仕上温度が750℃以
上1150℃以下であり、仕上板厚が1.5mm以下であ
って、最終パスにおける下記式1で定義されるパラメー
タの最大値を16.0未満かつその変動範囲を2.0以
下とした仕上熱間圧延を施して熱延板とする熱間圧延工
程を含むことを特徴とする磁気特性の均一な熱延珪素鋼
板の製造方法。
The gist of the present invention is as follows. (1) 0.1% ≦ Si ≦ 4.0% and 0.1% by weight.
One or both of 1% ≦ Mn ≦ 2.0%,
The slab consisting of Fe and unavoidable impurities is roughly rolled to form a sheet bar, and then the finishing temperature is 750 ° C. or more and 1150 ° C. or less, and the finished plate thickness is 1.5 mm or less. A hot rolling step in which a finish hot rolling is performed to make a hot-rolled sheet with a maximum value of a parameter defined by the formula below 16.0 and a variation range of 2.0 or less. Manufacturing method of uniform hot rolled silicon steel sheet.

【数2】 (2) 鋼成分として、さらに重量%で、0.1%≦so
l-Al≦1.5%を含有するスラブを用いることを特徴
とする前記(1)記載の磁気特性の均一な熱延珪素鋼板
の製造方法。 (3) 仕上熱間圧延中における式1で定義されるパラ
メータの変動を1.5以下とすることを特徴とする前記
(1)又は(2)記載の磁気特性の均一な熱延珪素鋼板
の製造方法。 (4) スラブを粗圧延して得られたシートバーを一度
巻き取り、一定時間保持した後にシートバーを巻きもど
した後、先行するシートバーと後行するシートバーとを
接合し、複数のシートバーを一体として連続的に仕上熱
間圧延に供することを特徴とする前記(1)、(2)又
は(3)記載の磁気特性の均一な熱延珪素鋼板の製造方
法。
(Equation 2) (2) As a steel component, 0.1% ≦ so
The method for producing a hot-rolled silicon steel sheet having uniform magnetic properties according to the above (1), wherein a slab containing l-Al ≦ 1.5% is used. (3) The hot rolled silicon steel sheet having uniform magnetic properties according to the above (1) or (2), wherein the variation of the parameter defined by the equation 1 during the finish hot rolling is set to 1.5 or less. Production method. (4) The sheet bar obtained by roughly rolling the slab is wound once, held for a certain time, then unwound, and the preceding sheet bar and the succeeding sheet bar are joined to form a plurality of sheets. The method for producing a hot-rolled silicon steel sheet having uniform magnetic properties according to the above (1), (2) or (3), wherein the bars are integrated and continuously subjected to finish hot rolling.

【0010】[0010]

【発明の実施の形態】以下に、本発明を詳細に説明す
る。まず、成分について説明すると、Siは鋼板の固有
抵抗を増大させ渦流損を低減させ、鉄損値を改善するた
めに添加される。Si含有量が0.1%未満であると固
有抵抗が十分に得られないので0.1%以上添加する必
要がある。一方、Si含有量が4.0%を超えると熱間
圧延が困難となるので4.0%以下とする必要がある。
Mnは、Al、Siと同様に鋼板の固有抵抗を増大させ
渦電流損を低減させる効果を有する。このため、Mn含
有量は0.1%以上とする必要がある。一方、Mn含有
量が2.0%を超えると熱延時の変形抵抗が増加し熱延
が困難となるとともに、熱延後の結晶組織が微細化しや
すくなり、製品の磁気特性が悪化するので、Mn含有量
は2.0%以下とする必要がある。本発明では上記のS
i、Mnのうち少なくとも1種を含有することを必須と
する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. First, regarding the components, Si is added to increase the specific resistance of the steel sheet, reduce eddy current loss, and improve the iron loss value. If the Si content is less than 0.1%, sufficient resistivity cannot be obtained, so it is necessary to add 0.1% or more. On the other hand, if the Si content exceeds 4.0%, hot rolling becomes difficult, so it is necessary to set the Si content to 4.0% or less.
Mn has the effect of increasing the specific resistance of a steel sheet and reducing eddy current loss, like Al and Si. For this reason, the Mn content needs to be 0.1% or more. On the other hand, if the Mn content exceeds 2.0%, the deformation resistance during hot rolling increases and hot rolling becomes difficult, and the crystal structure after hot rolling tends to become finer, which deteriorates the magnetic properties of the product. The Mn content needs to be 2.0% or less. In the present invention, the above S
It is essential that at least one of i and Mn be contained.

【0011】鋼中のAlは不純物レベルであってもなん
ら問題はないが、AlはSiと同様に鋼板の固有抵抗を
増大させ渦電流損を低減させる効果を有するので、特に
低鉄損を得たい場合には0.1%以上2.5%以下添加
するのが好ましい。多量にAl添加した場合には、磁束
密度が低下し、コスト高ともなるので2.5%以下とす
る。
Although there is no problem even if Al in the steel is at the impurity level, Al has the effect of increasing the specific resistance of the steel sheet and reducing the eddy current loss similarly to Si. If desired, it is preferable to add 0.1% or more and 2.5% or less. When a large amount of Al is added, the magnetic flux density is reduced and the cost is increased.

【0012】また、製品の機械的特性の向上、磁気的特
性、耐錆性の向上あるいはその他の目的のために、P、
B、Ni、Cr、Sb、Sn、Cuの1種または2種以
上を鋼中に含有させても本発明の効果は損なわれない。
In order to improve the mechanical properties, magnetic properties and rust resistance of the product or for other purposes, P,
Even if one or more of B, Ni, Cr, Sb, Sn, and Cu are contained in steel, the effect of the present invention is not impaired.

【0013】C、N、S、B、Pは本発明の請求項では
規定していないが、良好な磁気特性あるいは加工性を有
する無方向性電磁鋼板の製造にあたってはその含有量を
注意深く制御する必要があるので、以下に言及する。
Although C, N, S, B, and P are not specified in the claims of the present invention, their contents are carefully controlled in producing a non-oriented electrical steel sheet having good magnetic properties or workability. Since it is necessary, the following is mentioned.

【0014】Cは磁気時効を回避し鉄損の悪化を防止す
るため0.0050%以下であることが好ましい。一
方、Si含有量が少なく硬度が低い成分系の熱延珪素鋼
板の場合、C含有量を0.0250%程度にすること
で、打ち抜き性の改善を図っても良い。
C is preferably not more than 0.0050% in order to avoid magnetic aging and prevent deterioration of iron loss. On the other hand, in the case of a hot rolled silicon steel sheet having a low Si content and a low hardness, the C content may be set to about 0.0250% to improve the punching property.

【0015】S、Nは熱間圧延工程におけるスラブ加熱
中に一部再固溶し、熱間圧延中にMnS、AlN等の析
出物を形成し、仕上げ焼鈍時に再結晶粒の成長を妨げた
り製品が磁化されるときに磁壁の移動を妨げるいわゆる
ピニング効果を発揮し製品の低鉄損化を妨げる原因とな
る。従って、S≦0.0050%、N≦0.0050%
とすることが好ましい
S and N partially re-dissolve during the slab heating in the hot rolling step, and form precipitates such as MnS and AlN during the hot rolling, which hinder the growth of recrystallized grains during finish annealing. When the product is magnetized, it exerts a so-called pinning effect of hindering the movement of the domain wall, which hinders a reduction in iron loss of the product. Therefore, S ≦ 0.0050%, N ≦ 0.0050%
Preferably

【0016】Bは熱間圧延時にBNを形成させてAlN
の微細析出を妨げ、Nを無害化させるために添加され
る。B含有量はNとの量のバランスが必要であり、その
含有量は両者の比B%/N%が0.5から1.5の範囲を
満たすことが好ましい。
B forms AlN by forming BN during hot rolling.
Is added to prevent fine precipitation of N and render N harmless. The B content needs to be balanced with the amount of N, and the content is preferably such that the ratio B% / N% of the two satisfies the range of 0.5 to 1.5.

【0017】Pは、製品の打ち抜き性を良好ならしめる
ために0.1%までの範囲内において添加される。P≦
0.2%であれば、製品の磁気特性の観点から問題がな
い。
P is added in a range of up to 0.1% in order to improve the punchability of the product. P ≦
If it is 0.2%, there is no problem from the viewpoint of the magnetic properties of the product.

【0018】次に本発明のプロセス条件について説明す
る。前記成分からなる鋼スラブは、転炉で溶製され連続
鋳造により製造される。鋼スラブは公知の方法にて加熱
される。このスラブに粗圧延、仕上圧延からなる熱間圧
延を施し所定の厚みとする。以下に本発明の仕上圧延条
件を規定する理由について述べる。本発明における熱延
条件と磁気特性との関係を調査するため、以下の実験を
行った。本発明では仕上熱延条件を評価する指標とし
て、下記の式1で定義されるZパラメータを用いる。
Next, the process conditions of the present invention will be described. The steel slab composed of the above components is produced by melting in a converter and continuous casting. The steel slab is heated by a known method. The slab is subjected to hot rolling including rough rolling and finish rolling to a predetermined thickness. The reason for defining the finish rolling conditions of the present invention will be described below. The following experiment was conducted to investigate the relationship between the hot rolling conditions and the magnetic properties in the present invention. In the present invention, a Z parameter defined by the following equation 1 is used as an index for evaluating the finishing hot rolling condition.

【0019】[0019]

【数3】 (Equation 3)

【0020】ここで、Zパラメーターの値を求めるには
歪み速度を求める必要がある。その方法としては諸方法
があるが、本発明では下記の式2に従って歪み速度を求
めるものとする。
Here, to find the value of the Z parameter, it is necessary to find the strain rate. There are various methods as the method, but in the present invention, the strain rate is determined according to the following equation 2.

【0021】[0021]

【数4】 (Equation 4)

【0022】表1に示した成分を含有し、残部が実質的
にFeからなる鋼を、連続鋳造により220mm厚みに鋳
造したスラブを、粗圧延により板厚30mmのシートバー
とした。これらのシートバーを様々な条件で圧延し、
1.2mmの熱延板とした。この熱延珪素鋼板からエプス
タイン試料を切り出した。これらの試料の圧延条件の記
録から仕上熱延最終パスのZパラメーター(前述式1で
定義される)と磁気特性との関係を調べた。なお、本発
明では最終パスの圧下温度として、仕上温度を計算に用
いることにする。図1、図2に磁束密度、鉄損とZパラ
メーターとの関係を示す。図1、図2に示した結果よ
り、Zの値に依存して磁束密度、鉄損が変動することが
分かる。
A slab containing the components shown in Table 1 and the balance substantially consisting of Fe was cast into a 220 mm thick slab by continuous casting, and rough rolled to form a 30 mm thick sheet bar. Rolling these sheet bars under various conditions,
A 1.2 mm hot-rolled sheet was used. An Epstein sample was cut from this hot rolled silicon steel sheet. From the recording of the rolling conditions of these samples, the relationship between the Z parameter (defined by the above-described formula 1) of the final pass of the hot rolling and the magnetic properties was examined. In the present invention, the finishing temperature is used for the calculation as the rolling temperature of the final pass. 1 and 2 show the relationship between the magnetic flux density, iron loss and Z parameter. From the results shown in FIGS. 1 and 2, it can be seen that the magnetic flux density and the iron loss vary depending on the value of Z.

【0023】[0023]

【表1】 [Table 1]

【0024】このように本発明の熱延条件を満たす様に
仕上げ熱延を実施することにより、磁気特性の均一な無
方向性電磁鋼板を製造することが可能である。
As described above, by performing finish hot rolling so as to satisfy the hot rolling conditions of the present invention, it is possible to manufacture a non-oriented electrical steel sheet having uniform magnetic properties.

【0025】ここで、仕上熱間圧延の仕上温度は、70
0℃未満であると熱間変形抵抗が急激に増大し圧延が困
難となるので700℃以上とする。また、1150℃超
であると、熱延板の剛性が不足し、コイルの巻取りが著
しく不安定となるので1150℃以下とする。
Here, the finishing temperature of the finishing hot rolling is 70
If the temperature is lower than 0 ° C., the hot deformation resistance sharply increases and rolling becomes difficult. On the other hand, if the temperature exceeds 1150 ° C., the rigidity of the hot-rolled sheet becomes insufficient, and winding of the coil becomes extremely unstable.

【0026】また、Zの値には下限を特に設けない。Z
の値は圧延温度が高くなるか、歪み速度が低くなると減
少するが、圧延温度が高すぎると熱延鋼板の形状が悪化
するため、自ずから限界がある。歪速度の下限も圧延速
度の限界から熱延機の能力により自ずから決まるからで
ある。現実的な圧延条件からは、Zパラメータの値の範
囲は12.0以上となる。
There is no particular lower limit for the value of Z. Z
Is decreased when the rolling temperature is increased or the strain rate is decreased. However, when the rolling temperature is too high, the shape of the hot-rolled steel sheet is deteriorated, and there is a limit naturally. This is because the lower limit of the strain rate is naturally determined by the capacity of the hot rolling mill from the limit of the rolling rate. Under realistic rolling conditions, the range of the value of the Z parameter is 12.0 or more.

【0027】本発明では圧延中のZパラメータの値をよ
り均一にするため、粗圧延後のシートバーをいったん巻
き取って一定時間保定し、均熱化処理を施した後、これ
を巻きほどいて先行するシートバーに接合し、複数のシ
ートバーを連続して圧延することが極めて有効である。
シートバーの巻取り保定時間は30秒以上30分以下が
好ましい。30秒未満では均熱化処理の効果が得られ
ず、30分超ではその効果が飽和し、生産性の低下を招
くからである。これにより、圧延の噛み込み、および最
終部の尻抜けの部分をのぞく中間のシートバーを本発明
の構成要件を満たして圧延することが可能となる。
In the present invention, in order to make the value of the Z parameter during rolling more uniform, the sheet bar after rough rolling is once taken up, held for a certain period of time, subjected to a soaking process, and then unwound. It is extremely effective to join the preceding sheet bar and continuously roll a plurality of sheet bars.
The winding and holding time of the sheet bar is preferably 30 seconds or more and 30 minutes or less. If the time is less than 30 seconds, the effect of the soaking treatment cannot be obtained, and if the time is more than 30 minutes, the effect is saturated and the productivity is reduced. This makes it possible to roll the intermediate sheet bar except for the biting of rolling and the trailing edge of the last part, satisfying the constituent requirements of the present invention.

【0028】[0028]

【実施例】次に、本発明の実施例について述べる。 [実施例1]表2に示す成分を含み、残部Fe及び不可
避不純物からなる鋼を転炉により溶製し連続鋳造設備に
より厚さ200mmのスラブとした。このスラブを通常の
方法にて1250℃に加熱し、粗圧延により30mmのシ
ートバーとした。さらに6スタンドのタンデム仕上熱延
機により鋼は1.0mm厚みに仕上げた。仕上圧延の際、
熱延条件の指標であるZパラメーターの値を、最終パス
において種々の値を取るように圧延速度、圧延温度、パ
ススケジュールを調整した。
Next, an embodiment of the present invention will be described. [Example 1] Steel containing the components shown in Table 2 and the balance of Fe and unavoidable impurities was melted by a converter and made into a slab having a thickness of 200 mm by a continuous casting facility. The slab was heated to 1250 ° C. by a usual method and rough-rolled to form a 30 mm sheet bar. Further, the steel was finished to a thickness of 1.0 mm by a tandem finishing hot rolling machine of 6 stands. During finish rolling,
The rolling speed, rolling temperature, and pass schedule were adjusted so that the value of the Z parameter, which is an index of the hot rolling condition, takes various values in the final pass.

【0029】得られた熱延珪素鋼板からエプスタイン試
料を切り出し磁気特性を測定した。この時の熱延条件の
指標である最終パスにおけるZパラメータの値と、磁気
測定結果の関係を表3に示す。表3に示した結果より、
Zパラメータの変動範囲が2.0以下であると、磁束密
度、鉄損とも変動を小さくすることが可能である。さら
に、Zパラメータの変動範囲が1.5以下であると、磁
束密度、鉄損とも変動をより小さくすることが可能とな
ることが分かる。この結果は、さらに、Zパラメータの
値が16.0を超えると、磁気特性の低下が顕著である
事も分かる。このように本発明で定めた熱延条件を満た
す様に仕上げ熱延を実施することにより、長手方向の磁
気特性の安定した熱延珪素鋼板を得ることが可能であ
る。
An Epstein sample was cut out from the obtained hot-rolled silicon steel sheet and its magnetic properties were measured. Table 3 shows the relationship between the value of the Z parameter in the final pass, which is an index of the hot rolling conditions, and the result of the magnetic measurement. From the results shown in Table 3,
When the variation range of the Z parameter is 2.0 or less, it is possible to reduce both the magnetic flux density and the iron loss. Further, it can be seen that when the variation range of the Z parameter is 1.5 or less, it is possible to further reduce the variation in both the magnetic flux density and the iron loss. This result also shows that when the value of the Z parameter exceeds 16.0, the magnetic properties are significantly reduced. As described above, by performing finish hot rolling so as to satisfy the hot rolling conditions defined in the present invention, it is possible to obtain a hot rolled silicon steel sheet having stable magnetic properties in the longitudinal direction.

【0030】[0030]

【表2】 [Table 2]

【0031】[0031]

【表3】 [Table 3]

【0032】[実施例2]表4に示す成分を含み、残部
Fe及び不可避不純物からなる鋼を転炉により溶製し連
続鋳造設備により厚さ200mmのスラブとした。このス
ラブを通常の方法にて1250℃に加熱し、粗圧延によ
り30mmのシートバーとした。その後シートバーを先行
するシートバーに接合し、連続して熱延を行った。さら
に6スタンドのタンデム仕上熱延機により鋼は0.8mm
厚みに仕上げた。仕上圧延の際、熱延条件の指標である
Zパラメーターの値を、最終パスにおいて種々の値を取
るように圧延速度、圧延温度、パススケジュールを調整
した。
Example 2 A steel containing the components shown in Table 4 and consisting of the balance of Fe and unavoidable impurities was melted by a converter and made into a slab having a thickness of 200 mm by a continuous casting facility. The slab was heated to 1250 ° C. by a usual method and rough-rolled to form a 30 mm sheet bar. Thereafter, the sheet bar was joined to the preceding sheet bar, and hot rolling was continuously performed. 0.8mm steel with 6 stand tandem finishing hot rolling mill
Finished in thickness. At the time of finish rolling, the rolling speed, rolling temperature, and pass schedule were adjusted so that the value of the Z parameter, which is an index of hot rolling conditions, takes various values in the final pass.

【0033】得られた熱延珪素鋼板からエプスタイン試
料を切り出し磁気特性を測定した。この時の熱延条件の
指標である最終パスにおけるZパラメータの値と、磁気
測定結果の関係を表5に示す。表5に示した結果より、
Zパラメータの変動範囲が2.0以下であると、磁束密
度、鉄損とも変動を小さくすることが可能である。さら
に、Zパラメータの変動範囲が1.5以下であると、磁
束密度、鉄損とも変動をより小さくすることが可能とな
ることが分かる。この結果は、さらに、Zパラメータの
値が16.0を超えると、磁気特性の低下が顕著である
事も分かる。このように本発明で定めた熱延条件を満た
す様に仕上げ熱延を実施することにより、長手方向の磁
気特性の安定した熱延珪素鋼板を得ることが可能であ
る。
An Epstein sample was cut out from the obtained hot-rolled silicon steel sheet and its magnetic properties were measured. Table 5 shows the relationship between the value of the Z parameter in the final pass, which is an index of the hot rolling conditions, and the result of the magnetic measurement. From the results shown in Table 5,
When the variation range of the Z parameter is 2.0 or less, it is possible to reduce both the magnetic flux density and the iron loss. Further, it can be seen that when the variation range of the Z parameter is 1.5 or less, it is possible to further reduce the variation in both the magnetic flux density and the iron loss. This result also shows that when the value of the Z parameter exceeds 16.0, the magnetic properties are significantly reduced. As described above, by performing finish hot rolling so as to satisfy the hot rolling conditions defined in the present invention, it is possible to obtain a hot rolled silicon steel sheet having stable magnetic properties in the longitudinal direction.

【0034】[0034]

【表4】 [Table 4]

【0035】[0035]

【表5】 [Table 5]

【0036】[0036]

【発明の効果】このように本発明によれば、磁気特性の
均一な熱延珪素鋼板を製造することが可能である。
As described above, according to the present invention, it is possible to manufacture a hot-rolled silicon steel sheet having uniform magnetic properties.

【図面の簡単な説明】[Brief description of the drawings]

【図1】磁束密度とZパラメータとの関係を示す図であ
る。
FIG. 1 is a diagram showing a relationship between a magnetic flux density and a Z parameter.

【図2】鉄損とZパラメータとの関係を示す図である。FIG. 2 is a diagram illustrating a relationship between iron loss and a Z parameter.

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 重量%で、 0.1%≦Si≦4.0%と、 0.1%≦Mn≦2.0% との一方若しくは双方を含有し、残部がFeおよび不可
避不純物からなるスラブに粗圧延を施してシートバーと
し、次いで仕上温度が750℃以上1150℃以下であ
り、仕上板厚が1.5mm以下であって、最終パスにおけ
る下記式1で定義されるパラメータの最大値を16.0
未満かつその変動範囲を2.0以下とした仕上熱間圧延
を施して熱延板とする熱間圧延工程を含むことを特徴と
する磁気特性の均一な熱延珪素鋼板の製造方法。 【数1】
1. The composition contains one or both of 0.1% ≦ Si ≦ 4.0% and 0.1% ≦ Mn ≦ 2.0% by weight, with the balance being Fe and inevitable impurities. The slab is subjected to rough rolling to form a sheet bar, and then the finishing temperature is 750 ° C. or more and 1150 ° C. or less, the finished plate thickness is 1.5 mm or less, and the maximum value of the parameters defined by the following equation 1 in the final pass To 16.0
A method for producing a hot-rolled silicon steel sheet having uniform magnetic properties, comprising a hot-rolling step in which a hot-rolled sheet is formed by performing finish hot-rolling to make the hot-rolled sheet less than 2.0 and a fluctuation range of 2.0 or less. (Equation 1)
【請求項2】 鋼成分として、さらに重量%で、 0.1%≦sol-Al≦1.5% を含有するスラブを用いることを特徴とする請求項1記
載の磁気特性の均一な熱延珪素鋼板の製造方法。
2. The hot-rolled steel sheet with uniform magnetic properties according to claim 1, wherein a slab containing 0.1% ≦ sol-Al ≦ 1.5% by weight as a steel component is further used. Manufacturing method of silicon steel sheet.
【請求項3】 仕上熱間圧延中における式1で定義され
るパラメータの変動を1.5以下とすることを特徴とす
る請求項1又は2記載の磁気特性の均一な熱延珪素鋼板
の製造方法。
3. The production of a hot-rolled silicon steel sheet having uniform magnetic properties according to claim 1 or 2, wherein a variation of a parameter defined by the equation 1 during the finish hot rolling is set to 1.5 or less. Method.
【請求項4】 スラブを粗圧延して得られたシートバー
を一度巻き取り、一定時間保持した後にシートバーを巻
きもどした後、先行するシートバーと後行するシートバ
ーとを接合し、複数のシートバーを一体として連続的に
仕上熱間圧延に供することを特徴とする請求項1、2又
は3記載の磁気特性の均一な熱延珪素鋼板の製造方法。
4. A sheet bar obtained by roughly rolling a slab is once wound up, held for a predetermined time, then unwound, and a preceding sheet bar and a succeeding sheet bar are joined. 4. The method for producing a hot-rolled silicon steel sheet having uniform magnetic properties according to claim 1, 2 or 3, wherein the sheet bar is continuously subjected to finish hot rolling.
JP11639199A 1999-04-23 1999-04-23 Production of hot rolled silicon steel sheet uniform in magnetic property Withdrawn JP2000309823A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Publication Number Publication Date
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ID=14685878

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Country Status (1)

Country Link
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004104235A1 (en) * 2003-05-20 2004-12-02 National Institute For Materials Science Warm rolling method
WO2004104236A1 (en) * 2003-05-20 2004-12-02 National Institute For Materials Science Controlled warm-rolling method
CN114918249A (en) * 2022-05-21 2022-08-19 湖南华菱湘潭钢铁有限公司 Production method of large-size gear round steel

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004104235A1 (en) * 2003-05-20 2004-12-02 National Institute For Materials Science Warm rolling method
WO2004104236A1 (en) * 2003-05-20 2004-12-02 National Institute For Materials Science Controlled warm-rolling method
CN100386449C (en) * 2003-05-20 2008-05-07 独立行政法人物质·材料研究机构 Controlled warm-rolling method
US7727343B2 (en) 2003-05-20 2010-06-01 National Institute For Materials Science Controlled warm-rolling method
KR101107141B1 (en) * 2003-05-20 2012-02-06 도쿠리츠교세이호징 붓시쯔 자이료 겐큐키코 Controlled warm-rolling method
CN114918249A (en) * 2022-05-21 2022-08-19 湖南华菱湘潭钢铁有限公司 Production method of large-size gear round steel

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