JPH05148532A - Manufacture of grain oriented silicon steel sheet having excellent magnetic characteristic and insulating film quality - Google Patents
Manufacture of grain oriented silicon steel sheet having excellent magnetic characteristic and insulating film qualityInfo
- Publication number
- JPH05148532A JPH05148532A JP30898491A JP30898491A JPH05148532A JP H05148532 A JPH05148532 A JP H05148532A JP 30898491 A JP30898491 A JP 30898491A JP 30898491 A JP30898491 A JP 30898491A JP H05148532 A JPH05148532 A JP H05148532A
- Authority
- JP
- Japan
- Prior art keywords
- annealing
- steel sheet
- oxidation
- insulating film
- grain oriented
- 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
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- Manufacturing Of Steel Electrode Plates (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、方向性電磁鋼板の脱炭
焼鈍方法に係わり、磁気特性と絶縁皮膜の品質が共に優
れた方向性電磁鋼板の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 decarburizing and annealing a grain-oriented electrical steel sheet, and more particularly to a method for producing a grain-oriented electrical steel sheet having excellent magnetic properties and insulating film quality.
【0002】[0002]
【従来の技術】方向性珪素鋼板の製造工程中最終冷延
後、一次再結晶・脱炭・表面酸化を兼ねた、いわゆる脱
炭焼鈍が施される。この脱炭焼鈍を前部領域と後部領域
に分け、前部領域の雰囲気の酸化度(PH2O/PH2) を後
部領域のそれよりも高める方法が特公昭57−1575号公報
に提案されている。2. Description of the Related Art After the final cold rolling in the manufacturing process of grain-oriented silicon steel sheet, so-called decarburization annealing which also serves as primary recrystallization, decarburization and surface oxidation is performed. Japanese Patent Publication No. 57-1575 proposes a method of dividing this decarburization annealing into a front region and a rear region, and increasing the degree of oxidation (PH 2 O / PH 2 ) of the atmosphere in the front region higher than that in the rear region. ing.
【0003】一方、方向性珪素鋼板の磁気特性を向上さ
せる方法として、特公昭59-32526号公報に記載の素材成
分中のSi量を高めるとともに、それに応じてC量を高め
る方法や特公昭55-119126 号公報に記載の、熱延にてγ
相を3%以上析出させる方法──この方法を採るには、
素材C量を高める必要がある──などが知られている。On the other hand, as a method for improving the magnetic properties of grain-oriented silicon steel sheet, a method described in JP-B-59-32526 and a method for increasing the amount of Si in the raw material components and correspondingly increasing the amount of C and JP-B-55-55. -119126, γ in hot rolling
Method of precipitating 3% or more of phase ── To adopt this method,
It is known that it is necessary to increase the amount of material C.
【0004】脱炭焼鈍前のC量が高い材料に、脱炭焼鈍
雰囲気に関する前記従来技術を適用すると、十分低い値
(0.003%以下) に脱炭される前に、前部領域の酸化度が
高いために、鋼板表面の酸化皮膜が厚く生成し、その後
の脱炭がほとんど進行しなくなる。脱炭焼鈍後のC量が
十分低くない状態で仕上焼鈍が施されると、二次再結晶
が不完全になり易く、良好な磁気特性を持つ製品が得ら
れないという問題がある。When the above-mentioned prior art relating to the decarburizing and annealing atmosphere is applied to a material having a high C content before decarburizing and annealing, a sufficiently low value is obtained.
Before decarburization to (0.003% or less), since the degree of oxidation in the front region is high, a thick oxide film is formed on the surface of the steel sheet, and subsequent decarburization hardly progresses. If finish annealing is performed in a state where the amount of C after decarburization annealing is not sufficiently low, there is a problem that secondary recrystallization is likely to be incomplete and a product having good magnetic properties cannot be obtained.
【0005】[0005]
【発明が解決しようとする課題】本発明は、前記課題を
脱炭焼鈍方法の改良により解決し、磁気特性と絶縁皮膜
の品質が共に優れた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ものである。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems by improving a decarburizing annealing method, and to provide a method for producing a grain-oriented electrical steel sheet excellent in both magnetic properties and insulating film quality. It is what
【0006】[0006]
【課題を解決するための手段】すなわち、本発明は、方
向性電磁鋼板素材を最終冷延後、脱炭焼鈍を施すに当
り、脱炭焼鈍工程の前部領域の雰囲気の露点(dp)を40〜
65℃に、かつ酸化度(PH2O/PH2) を 0.3以下とし、さ
らに後部領域の雰囲気の露点(dp)を40〜75℃に、かつ酸
化度(PH2O/PH2) を0.3 〜 0.6とすることを特徴とす
る磁気特性と絶縁皮膜の品質が共に優れた方向性電磁鋼
板の製造方法である。Means for Solving the Problems That is, in the present invention, when decarburizing annealing is performed after the final cold rolling of grain-oriented electrical steel sheet, the dew point (dp) of the atmosphere in the front region of the decarburizing annealing step is set. 40 ~
The degree of oxidation (PH 2 O / PH 2 ) is set to 65 or less, the dew point (dp) of the atmosphere in the rear region is set to 40 to 75 ° C., and the degree of oxidation (PH 2 O / PH 2 ) is set to 0.3. It is a method for producing a grain-oriented electrical steel sheet excellent in both magnetic properties and the quality of the insulating film, which is characterized in that
【0007】[0007]
【作用】従来の脱炭焼鈍方法では、焼鈍工程の前部領域
の雰囲気の酸化度(PH2O/PH2) の高いことが、脱炭が
十分に進行しない原因であることから本発明は、先ず前
部領域の酸化度を低くし、かつ脱炭に必要な水分を所定
量確保するため、露点(dp)を比較的高目にし、表面酸化
皮膜の生成を極力抑制しながら、脱炭を十分に進行させ
るようにした。他方、脱炭焼鈍の全ヒートサイクルに亘
って、前部領域と同様の低い酸化度の雰囲気で処理する
と、表面酸化量が少なく、次工程の仕上焼鈍で形成され
るガラス質の絶縁皮膜の密着性と表面外観の均一性が劣
るので、後部領域の雰囲気の酸化度を前部領域より高め
て、所定量の酸化量を得るようにした。In the conventional decarburization annealing method, the high degree of oxidation (PH 2 O / PH 2 ) in the atmosphere in the front region of the annealing step is the reason why decarburization does not proceed sufficiently. First, in order to lower the degree of oxidation in the front area and to secure a certain amount of water necessary for decarburization, the dew point (dp) is set relatively high and decarburization is performed while suppressing the formation of surface oxide film as much as possible. Was made to progress sufficiently. On the other hand, over the entire heat cycle of decarburization annealing, when treated in an atmosphere with the same low degree of oxidation as the front area, the amount of surface oxidation is small, and the adhesion of the vitreous insulating film formed by finish annealing in the next step Since the uniformity and the uniformity of the surface appearance are inferior, the degree of oxidation of the atmosphere in the rear region was made higher than that in the front region to obtain a predetermined amount of oxidation.
【0008】次に本発明を、実験結果に基づいてさらに
詳細に説明する。図1は、脱炭焼鈍前の鋼板成分が、
C: 0.045%, Si:3.05%, Mn:0.05%,Se: 0.012%,
Sb:0.03%である0.23mm厚の鋼板を、同図中に示す条
件で焼鈍し、その途中で中断して、炉から引出した鋼板
のC濃度を調査した結果である。同図から、焼鈍前部の
雰囲気の酸化度が低くかつ、dpの高い本発明例では、前
部焼鈍時点で、好適範囲に脱炭しているのに比し、前部
雰囲気の酸化度が高いか、あるいは、酸化度, dp共に低
い比較例では、前部焼鈍終了後はもちろん、後部焼鈍終
了後でも、好適範囲まで脱炭が進行していないことが判
る。Next, the present invention will be described in more detail based on experimental results. Fig. 1 shows that the steel sheet composition before decarburization annealing is
C: 0.045%, Si: 3.05%, Mn: 0.05%, Se: 0.012%,
Sb: 0.03% of a 0.23 mm thick steel plate was annealed under the conditions shown in the figure, interrupted in the middle, and the C concentration of the steel plate pulled out from the furnace was investigated. From the figure, the degree of oxidation of the atmosphere of the annealing front is low, and in the example of the present invention with a high dp, at the time of the front annealing, the degree of oxidation of the front atmosphere is higher than that of decarburization in a suitable range. In the comparative example where the degree of oxidation is high, or the degree of oxidation and dp are both low, it is understood that decarburization has not progressed to a suitable range not only after the front annealing but also after the rear annealing.
【0009】図2は、図1と同様に、C:0.07%, Si:
3.20%, Mn:0.06%, Se: 0.015%, Sb: 0.020%, A
l:0.03%, N: 0.007%を含有する鋼板( 0.23mm厚)
の脱炭焼鈍後の表面酸化増量を鋼板両面合計の1m2当り
の量で示したもので、後部雰囲気の酸化度の高い発明例
では、好適範囲の酸化増量が得られるのに比し、酸化度
の低い比較例では、酸化増量が小さいことが判る。FIG. 2 is similar to FIG. 1 in that C: 0.07%, Si:
3.20%, Mn: 0.06%, Se: 0.015%, Sb: 0.020%, A
l: 0.03%, N: 0.007% containing steel plate (0.23mm thickness)
The amount of surface oxidation increase after decarburization annealing is shown by the amount per 1 m 2 of the total amount of both sides of the steel sheet. In the invention examples having a high degree of oxidation in the rear atmosphere, the amount of oxidation increase in the preferable range was It can be seen that in the comparative example of low degree, the increase in oxidation amount is small.
【0010】次に脱炭焼鈍雰囲気の限定理由を述べる。
前部領域については、酸化度が 0.3を超えるとき、およ
びdpが40℃より低いとき脱炭焼鈍後のC濃度が好適範囲
まで低下しないため、またdpが65℃を超えると酸化度が
0.3より大となるため、酸化度を 0.3以下dpを40〜65℃
に限定する。後部領域については、酸化度が 0.6を超え
ると、酸化増量が過大となり、成品の磁気特性を劣化さ
せる。また酸化度が 0.3未満またはdpが40℃を下回ると
きには、好適範囲の酸化増量が得られない。またdpが75
℃を超えると酸化度が 0.6を超えるため、酸化度を 0.3
〜 0.6、dpを40〜75℃に限定する。Next, the reasons for limiting the decarburization annealing atmosphere will be described.
Regarding the front region, when the oxidation degree exceeds 0.3 and when dp is lower than 40 ° C, the C concentration after decarburization annealing does not decrease to a suitable range, and when dp exceeds 65 ° C, the oxidation degree is increased.
Since it is greater than 0.3, the degree of oxidation is 0.3 or less dp is 40 to 65 ° C
Limited to In the rear region, if the degree of oxidation exceeds 0.6, the amount of increased oxidation becomes excessive, deteriorating the magnetic properties of the product. If the degree of oxidation is less than 0.3 or dp is less than 40 ° C., the amount of increased oxidation cannot be obtained in the preferred range. Also, dp is 75
When the temperature exceeds ℃, the degree of oxidation exceeds 0.6.
~ 0.6, dp limited to 40 ~ 75 ℃.
【0011】前部領域、後部領域の焼鈍時間としては雰
囲気の酸化度の程度に応じて、前部領域では、好適範囲
の鋼中C濃度が、後部領域では、好適範囲の表面酸化増
量が得られる時間を選べばよい。本発明の対象とする鋼
板は、成分としてC:0.03〜0.10%、Si: 2.8〜 4.5%
を含有する方向性珪素鋼板用素材であり、結晶粒成長抑
制のために含有させる元素のいかんを問わない。As for the annealing time of the front region and the rear region, depending on the degree of oxidation of the atmosphere, the C concentration in the steel in the preferable range is obtained in the front region, and the amount of surface oxidation increase in the preferable region is obtained in the rear region. All you have to do is choose the time you can spend The steel sheet targeted by the present invention has C: 0.03 to 0.10% and Si: 2.8 to 4.5% as components.
It is a raw material for grain-oriented silicon steel sheet, containing any of the elements contained for suppressing crystal grain growth.
【0012】酸化度の調整は、雰囲気をH2−N2またはH2
−Arの混合ガスとし、混合比率の調整とdpの調整によっ
て行う。The degree of oxidation is adjusted by changing the atmosphere to H 2 --N 2 or H 2
-Ar mixed gas is used by adjusting the mixing ratio and dp.
【0013】[0013]
【実施例】表1に示す成分を含有する方向性珪素鋼板を
鋳造, 熱延, 焼鈍, 冷延の工程を経て、0.23mm厚に仕上
げた後、H2−N2混合ガス中、表2に示す雰囲気条件で84
0℃の脱炭焼鈍を施し、次いで MgOを主体とする分離剤
を塗布し、仕上焼鈍を施した。EXAMPLE A grain-oriented silicon steel sheet containing the components shown in Table 1 was cast, hot-rolled, annealed, and cold-rolled to a thickness of 0.23 mm, and then in a H 2 —N 2 mixed gas. 84 under the atmospheric conditions shown in
Decarburization annealing was performed at 0 ° C, then a separating agent mainly containing MgO was applied, and finish annealing was performed.
【0014】仕上焼鈍に際して、素材 No.1〜4に対し
ては、Arガス中で 870℃ 30Hr 保定後、H2ガス中で1200
℃ 10Hr 、素材 No.5〜10に対しては、N2ガス中で 750
℃ 20Hr 保定後、H2ガス中で1200℃ 10Hr の焼鈍条件を
適用した。得られた成品の磁気特性と絶縁皮膜評価を表
3に示す。同表からいずれの素材についても成品の磁気
特性、絶縁皮膜評価が良好な条件は、本発明に対応する
D,E,Fのみであることが明らかである。At the time of finish annealing, for materials Nos. 1 to 4, after holding at 870 ° C. for 30 Hr in Ar gas, 1200 in H 2 gas.
750 ℃ in N 2 gas for 10Hr, material No. 5-10
After holding at ℃ 20Hr, annealing condition of 1200 ℃ 10Hr in H 2 gas was applied. Table 3 shows the magnetic properties and insulating film evaluation of the obtained product. From the table, it is clear that the conditions for good magnetic properties and good evaluation of the insulating film of all the materials are D, E and F corresponding to the present invention.
【0015】[0015]
【表1】 [Table 1]
【0016】[0016]
【表2】 [Table 2]
【0017】[0017]
【表3】 [Table 3]
【0018】[0018]
【発明の効果】本発明により、磁気特性,絶縁皮膜共に
良好な成品を安定して製造することが可能となった。According to the present invention, it becomes possible to stably manufacture a product having good magnetic properties and an insulating film.
【図1】脱炭焼鈍中の鋼中C%の変化を示す図である。FIG. 1 is a diagram showing changes in C% in steel during decarburization annealing.
【図2】脱炭焼鈍後の酸化増量を示す図である。FIG. 2 is a diagram showing the amount of increase in oxidation after decarburization annealing.
Claims (1)
焼鈍を施すに当り、脱炭焼鈍工程の前部領域の雰囲気の
露点(dp)を40〜65℃に、かつ酸化度(PH2O/PH2) を
0.3以下とし、さらに後部領域の雰囲気の露点(dp)を40
〜75℃に、かつ酸化度(PH2O/PH2) を0.3 〜 0.6とす
ることを特徴とする磁気特性と絶縁皮膜の品質が共に優
れた方向性電磁鋼板の製造方法。1. When decarburizing annealing is performed after the final cold rolling of the grain-oriented electrical steel sheet, the dew point (dp) of the atmosphere in the front region of the decarburizing annealing step is set to 40 to 65 ° C. and the oxidation degree ( PH 2 O / PH 2 )
0.3 or less, and the dew point (dp) of the atmosphere in the rear area is 40 or less.
A method for producing a grain-oriented electrical steel sheet having excellent magnetic properties and insulating film quality, characterized in that the degree of oxidation (PH 2 O / PH 2 ) is set to 0.3 to 0.6 at a temperature of up to 75 ° C.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30898491A JP3387937B2 (en) | 1991-11-25 | 1991-11-25 | Method for producing grain-oriented silicon steel sheet excellent in both magnetic properties and insulating film quality |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30898491A JP3387937B2 (en) | 1991-11-25 | 1991-11-25 | Method for producing grain-oriented silicon steel sheet excellent in both magnetic properties and insulating film quality |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH05148532A true JPH05148532A (en) | 1993-06-15 |
JP3387937B2 JP3387937B2 (en) | 2003-03-17 |
Family
ID=17987554
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP30898491A Expired - Fee Related JP3387937B2 (en) | 1991-11-25 | 1991-11-25 | Method for producing grain-oriented silicon steel sheet excellent in both magnetic properties and insulating film quality |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3387937B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019013350A1 (en) * | 2017-07-13 | 2019-01-17 | 新日鐵住金株式会社 | Oriented electromagnetic steel plate |
-
1991
- 1991-11-25 JP JP30898491A patent/JP3387937B2/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019013350A1 (en) * | 2017-07-13 | 2019-01-17 | 新日鐵住金株式会社 | Oriented electromagnetic steel plate |
JPWO2019013350A1 (en) * | 2017-07-13 | 2020-08-06 | 日本製鉄株式会社 | Grain oriented electrical steel |
US11450460B2 (en) | 2017-07-13 | 2022-09-20 | Nippon Steel Corporation | Grain-oriented electrical steel sheet |
Also Published As
Publication number | Publication date |
---|---|
JP3387937B2 (en) | 2003-03-17 |
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