JPS6169924A - Method for heating electromagnetic steel slab - Google Patents
Method for heating electromagnetic steel slabInfo
- Publication number
- JPS6169924A JPS6169924A JP18502585A JP18502585A JPS6169924A JP S6169924 A JPS6169924 A JP S6169924A JP 18502585 A JP18502585 A JP 18502585A JP 18502585 A JP18502585 A JP 18502585A JP S6169924 A JPS6169924 A JP S6169924A
- Authority
- JP
- Japan
- Prior art keywords
- slab
- heating
- steel
- steel slab
- atmosphere
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- 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
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular fabrication or treatment of ingot or slab
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Manufacturing & Machinery (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は連続鋳造法によシ得た電磁鋼スラブの加熱方法
に係）、その目的は加熱時の溶融スケールの生成を抑え
て鉄歩留υの向上を図ると共に成品の表面疵を防止する
ところにある。[Detailed Description of the Invention] The present invention relates to a method for heating an electrical steel slab obtained by a continuous casting method), and its purpose is to suppress the formation of molten scale during heating and improve the iron yield υ. Its purpose is to prevent surface flaws on the product.
周知の如く一方向性電磁鋼板の製造においては、−次男
結晶粒の正常粒成長を抑制するために、ＭｎＳ、ＡＡ！
Ｎ等の析出分散相が用いられている口これらの析出分散
相を制御するために、熱延加熱温度は１２５０〜１４０
０℃の高温加熱が必要であシ、そのため、一方向性電磁
鋼板のスラブ加熱では、普通の鋼材と比較して、
（１） 溶損による鉄ロスで歩留低下が大きい。As is well known, in the production of unidirectional electrical steel sheets, MnS, AA!
When a precipitated dispersed phase such as N is used, the hot rolling heating temperature is set at 1250 to 140° C. to control the precipitated dispersed phase.
High-temperature heating of 0°C is required, and therefore, in slab heating of unidirectional electrical steel sheets, compared to ordinary steel materials, (1) Yield reduction is greater due to iron loss due to melting damage.
（２）加熱炉内の堆積７０の除去が必要である。(2) It is necessary to remove the deposit 70 in the heating furnace.
従来の熱延加熱炉内の溶損についてのべれば鉄の融点（
１５３５°Ｃ）以下の温度で表面が溶融するのけ、加熱
中にスラブ表面が酸化して、Ｓｉを含有する低融点のス
ケールを形成するからである。Regarding melting loss in a conventional hot rolling heating furnace, the melting point of iron (
This is because although the surface melts at temperatures below 1535°C, the slab surface oxidizes during heating to form a low melting point scale containing Si.
連続鋳造法により得られた電磁鋼スラブを燃料燃焼炉で
１２５０〜１３００°Ｃの間の温度に加熱し、続いて誘
導加熱又は抵抗加熱の如き電気加熱によ、９１３５０〜
１４００℃の間に加熱する方法が特公昭４７−１４６２
７号公報で提案されており、これよ）磁気特性が向上し
、又電気加熱方式による急速短時間加熱により材料の損
失が減少することが示されている口
本発明者らは電磁鋼スラブの加熱に電気加熱方式を採用
することについて詳細に検討を行った。Electrical steel slabs obtained by continuous casting are heated in a fuel-burning furnace to a temperature between 1250 and 1300°C, followed by electrical heating such as induction heating or resistance heating to a temperature between 91350 and 1300°C.
The method of heating to 1400℃ was published in Japanese Patent Publication No. 47-1462.
The present inventors have proposed an electrical steel slab that improves magnetic properties and reduces material loss due to rapid short-term heating using an electric heating method. We conducted a detailed study on adopting an electric heating method for heating.
その結果、雰囲気制御した誘導加熱炉を用いてスラブの
加熱実験を繰り返して、大気中（０２約２０％）で加熱
した場合には、スラブ表面温度が１３２５°Ｃを越える
と、溶融スケールが発生し溶損が始まること、および雰
囲気中の０２濃度を１０％以下に制御することによｐ、
１３７５℃の高温でも溶融スケールが発生しないことを
確めた。As a result, we repeatedly conducted slab heating experiments using an atmosphere-controlled induction heating furnace, and found that when the slab surface temperature exceeded 1325°C, melting scale occurred when the slab was heated in the atmosphere (approximately 20%). By controlling the 02 concentration in the atmosphere to 10% or less,
It was confirmed that no melting scale was generated even at a high temperature of 1375°C.
第１図は誘導加熱炉で、一方同性電磁鋼スラブを加熱し
た場合のスラブ表面温度及び炉内雰囲気中０２濃度とス
ラブ酸化減量の関係を示したものである。FIG. 1 shows the relationship between slab surface temperature, 02 concentration in the furnace atmosphere, and slab oxidation loss when a homogeneous electrical steel slab is heated in an induction heating furnace.
即ち、スラブ加熱炉として、従来の燃料燃焼炉では、雰
囲気中の０２ｆｌｋ度を１０％以下に制御することは困
難であるが、霞導加熱等の電気加熱方式音用いた炉では
雰囲気制御が容易で、ＭｎＳ ＊ ＡＺＮ等のインヒビ
ターを完全に固溶させる温度条件下で、溶融スケールの
発生をよシ完全に防止することが可能となった。In other words, it is difficult to control the 02flk degree in the atmosphere to 10% or less in a conventional fuel combustion furnace as a slab heating furnace, but it is easy to control the atmosphere in a furnace that uses electric heating and sound such as haze conduction heating. Therefore, it has become possible to completely prevent the occurrence of melted scale under temperature conditions that completely dissolve the inhibitor such as MnS*AZN.
本発明に於いて対象とする加熱方式としては、前掲の特
公昭４７−１４６２７号公報記載の燃料燃焼炉と誘導加
熱炉との組合せにより、燃料燃焼炉では１２５０℃まで
の加熱を行ない、誘導加熱炉では１２５０℃〜１４００
℃の加熱を行なうことが好ましい。本発明においてはこ
の誘導加熱炉で、表面温度が１３２５℃を越える高温に
加熱する場合にその雰囲気中の０２濃度を１０％以下に
抑えるものである。The heating method targeted by the present invention is a combination of a fuel combustion furnace and an induction heating furnace described in the above-mentioned Japanese Patent Publication No. 47-14627. In the furnace 1250℃~1400℃
It is preferable to perform heating at .degree. In the present invention, when heating to a high surface temperature exceeding 1325° C. in this induction heating furnace, the 02 concentration in the atmosphere is suppressed to 10% or less.
以下実施例を説明する。Examples will be described below.
実施例１
転炉で溶製し、真空脱ガス装置で脱ガスおよび成分微調
整を行ったＣＱ、０４％、 Ｓｉ ３．１９％ 、 Ｍ
ｎ０．０６係、８０．０２％の組下成分の溶錦を２５０
ｍｍ厚スラブに連続鋳造し、鋳造完了後、１２５０℃に
設定した燃料燃焼加熱炉に装入した。１２５０℃に均熱
されたスラブを更にＮ２ガス／４′−ノによシ０２量を
１０％以下に雰囲気制御した誘導加熱炉に装入し、急速
加熱をして、表面温度１３５０℃Ｘ３０分の均熱をさせ
た後熱延を行った。その他のスラブはそのままの状態で
、従来方式の燃料燃焼加熱炉に装入し、１３５０’（、
に均熱した後、熱延を行った。これらのホットコイルを
中間焼鈍を含む２回圧延性工程で通板し、板厚０．３０
団の成品とした結果を第１表に示す
第 １ 表
実施例２
転炉で溶製し、真空脱ガス装置で脱ガス２よび成分微調
整を行った Ｃ０，０５％、 Ｓｔ ３．ｉ ３％ 、
Ｍｎ０．０７％、３０．０２％の組下成分の溶鋼ｔ
２５０ ｍｍｍススラブ連続鋳造し、鋳造完了後、１２
５０℃に設定した燃料燃焼炉に装入し、１２５０℃に均
熱されたスラブを更にＮｆｆｆｆ−ジによシ０□量を１
％以下に雰囲気制御した誘導加熱炉に装入し、急速加熱
して、表面温度１３７０℃×３０分の均熱をさせた後、
熱延を行った。残シのスラブは、従来方式の燃料燃焼加
熱炉に装入し、１３５０℃に均熱した後、熱延を行った
。これらのホットコイルを中間焼鈍を含む２回圧延性工
程で通板し、板厚０．３０ｍｚの成品とした結果を第２
表に示す。Example 1 CQ, 04%, Si 3.19%, M melted in a converter, degassed in a vacuum degassing device, and finely adjusted the components.
250% n0.06, molten brocade with 80.02% composition
It was continuously cast into a mm thick slab, and after the casting was completed, it was charged into a fuel combustion heating furnace set at 1250°C. The slab soaked at 1250°C was further charged into an induction heating furnace in which the atmosphere was controlled to 10% or less with N2 gas/4'-NO gas, and rapidly heated to a surface temperature of 1350°C for 30 minutes. After soaking, hot rolling was performed. The other slabs were charged as they were into a conventional fuel-fired heating furnace.
After soaking, hot rolling was performed. These hot coils were passed through a two-time rolling process including intermediate annealing to a plate thickness of 0.30.
The results are shown in Table 1.Table 1 Example 2 Molten in a converter, degassed in a vacuum degassing device and fine-tuned the components.C0.05%, St 3. i 3%,
Molten steel with Mn components of 0.07% and 30.02%
Continuously cast 250 mm slabs, and after completion of casting, 12
The slab was charged into a fuel combustion furnace set at 50°C and soaked at 1250°C.
After charging into an induction heating furnace whose atmosphere was controlled to below %, rapidly heating it, and soaking it for 30 minutes at a surface temperature of 1370°C,
Hot rolling was performed. The remaining slab was charged into a conventional fuel combustion heating furnace, heated to 1350°C, and then hot rolled. These hot coils were passed through a two-time rolling process including intermediate annealing, and the results of the finished product with a thickness of 0.30 mz are shown in the second table.
Shown in the table.
第 ２ 表
上記実施例１及び２からも明らかな様に、本発明方法に
よシ鉄歩留ロス及び磁性共に良好な結果が得られた。Table 2 As is clear from Examples 1 and 2 above, the method of the present invention yielded good results in terms of iron yield loss and magnetism.
第１図は誘導加熱炉で一方向性電磁鋼スラブを加熱した
場合のスラブ表面温度及び炉内雰囲気中０□濃度とスラ
ブ酸化減量の関係を示したものである。FIG. 1 shows the relationship between the slab surface temperature, the 0□ concentration in the furnace atmosphere, and the slab oxidation weight loss when a unidirectional electrical steel slab is heated in an induction heating furnace.
Claims (1)
温度に加熱後圧延する方法において、スラブ表面温度が
１３２５℃以上の高温域の加熱を、雰囲気中のＯ＿２濃
度を１０％以下に調整した誘導加熱炉により行なうこと
を特徴とする電磁鋼スラブの加熱方法。In a method in which a continuously cast electromagnetic steel slab is heated to a temperature of 1250 to 1400°C and then rolled, heating in a high temperature range where the slab surface temperature is 1325°C or higher is performed by induction heating in which the O_2 concentration in the atmosphere is adjusted to 10% or less. A method of heating an electromagnetic steel slab characterized by heating it using a furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18502585A JPS6169924A (en) | 1985-08-24 | 1985-08-24 | Method for heating electromagnetic steel slab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18502585A JPS6169924A (en) | 1985-08-24 | 1985-08-24 | Method for heating electromagnetic steel slab |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15396481A Division JPS5858228A (en) | 1981-09-30 | 1981-09-30 | Heating method for electrical steel slab |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6169924A true JPS6169924A (en) | 1986-04-10 |
| JPH0524202B2 JPH0524202B2 (en) | 1993-04-07 |
Family
ID=16163461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18502585A Granted JPS6169924A (en) | 1985-08-24 | 1985-08-24 | Method for heating electromagnetic steel slab |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6169924A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0543936A (en) * | 1991-08-12 | 1993-02-23 | Nippon Steel Corp | Method for heating grain oriented electrical steel slab |
| JPH06212247A (en) * | 1993-01-11 | 1994-08-02 | Nippon Steel Corp | Method for controlling atmosphere in induction heating furnace |
| KR100259400B1 (en) * | 1994-07-22 | 2000-06-15 | 에모또 간지 | Method of manufacturing grain oriented silicon steel exhibiting excellent magnetic characteristics over the entire length of coil thereof |
-
1985
- 1985-08-24 JP JP18502585A patent/JPS6169924A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0543936A (en) * | 1991-08-12 | 1993-02-23 | Nippon Steel Corp | Method for heating grain oriented electrical steel slab |
| JP2563695B2 (en) * | 1991-08-12 | 1996-12-11 | 新日本製鐵株式会社 | Method of heating grain-oriented electrical steel slabs |
| JPH06212247A (en) * | 1993-01-11 | 1994-08-02 | Nippon Steel Corp | Method for controlling atmosphere in induction heating furnace |
| KR100259400B1 (en) * | 1994-07-22 | 2000-06-15 | 에모또 간지 | Method of manufacturing grain oriented silicon steel exhibiting excellent magnetic characteristics over the entire length of coil thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0524202B2 (en) | 1993-04-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP7454646B2 (en) | High magnetic induction grain-oriented silicon steel and its manufacturing method | |
| JPS5920731B2 (en) | Manufacturing method for electric iron plates with excellent magnetic properties | |
| JPH0686631B2 (en) | Method for manufacturing unidirectional electrical steel sheet with high magnetic flux density | |
| JPH01230721A (en) | Manufacture of grain-oriented silicon steel sheet having high saturation magnetic flux density | |
| JPS6160895B2 (en) | ||
| JPS6169924A (en) | Method for heating electromagnetic steel slab | |
| JP3369443B2 (en) | Manufacturing method of high magnetic flux density unidirectional electrical steel sheet | |
| JPS5832214B2 (en) | Method for manufacturing unidirectional silicon steel sheet with extremely high magnetic flux density and low iron loss | |
| JPS6242968B2 (en) | ||
| JPS5858228A (en) | Heating method for electrical steel slab | |
| JP3133855B2 (en) | Manufacturing method of grain-oriented electrical steel sheet with excellent magnetic properties | |
| JPS5823411A (en) | Nondirectional electromagnetic steel plate having superior magnetism and manufacture therefor | |
| JPS6237688B2 (en) | ||
| JPH0250908A (en) | Method for preventing intergranular oxidation of high-strength cold-rolled steel sheet | |
| JPH02138418A (en) | Production of grain-oriented electrical steel sheet having excellent magnetic characteristic and surface characteristic | |
| JPS581172B2 (en) | Manufacturing method of non-oriented silicon steel sheet with excellent magnetic properties | |
| JPH066747B2 (en) | Method for producing unidirectional silicon steel sheet having high magnetic flux density and low iron loss | |
| JPS6169927A (en) | Method for heating continuous casting slab of single orientation electro magnetic steel | |
| JP3536303B2 (en) | Manufacturing method of grain-oriented electrical steel sheet with uniform magnetic properties in the width direction | |
| JPS61243124A (en) | Production of black plate for tin plate having excellent workability | |
| JPH0657854B2 (en) | Method of heating grain-oriented silicon steel slab | |
| JPS6360812B2 (en) | ||
| JPH0689406B2 (en) | Method for producing grain-oriented silicon steel sheet having good magnetic properties | |
| JPH02263921A (en) | Production of grain-oriented silicon steel plate | |
| JPS6184327A (en) | Production of high-silicon thin grain-oriented silicon steel sheet |