JP7117372B2 - 冷間圧延鋼帯の急速加熱装置および方法 - Google Patents
冷間圧延鋼帯の急速加熱装置および方法 Download PDFInfo
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Description
前記鋼帯を、200℃から目標キュリー温度-100℃までの温度範囲に加熱可能な、ガス加熱または電気加熱による第1輻射加熱機構が設けられる第1加熱帯、
前記鋼帯を、300℃から前記目標キュリー温度-50℃までの温度範囲に加熱可能な、第1誘導コイルによる第1誘導加熱機構が設けられる第2加熱帯、
前記鋼帯を、前記目標キュリー温度-30℃から前記目標キュリー温度-3℃までの温度範囲に加熱可能な、第2誘導コイルによる第2誘導加熱機構が設けられる第3加熱帯、および
鋼帯を、前記目標キュリー温度よりも高い温度に加熱可能な、ガス加熱または電気加熱による第2輻射加熱機構が設けられる第4加熱帯、に区画される。
重量%で、化学元素の含有量がC:0.035~0.120%、Si:2.9~4.5%、Mn:0.05~0.20%、P:0.005~0.050%、S:0.005~0.012%、Als:0.015~0.035%、N:0.001~0.010%、Cr:0.05~0.30%、Sn:0.005~0.200%、V:≦0.0100%、Ti:≦0.0100%である鋼板スラブは、以下の工程により製造される。鋼板スラブを1150℃で加熱した後に厚さ2.3mmに熱間圧延した熱間圧延鋼板とする工程、正常化焼鈍工程、冷間圧延の厚さを0.29mmとする目標厚さに冷間圧延する工程、圧延油および鉄分を除去するように冷間圧延鋼帯の表面を洗浄する工程、連続脱炭焼鈍ラインがそれぞれ従来の輻射管、中国特許(CN101652485A)および本発明の実施例の焼鈍設備を使用して脱炭焼鈍を行う工程、窒化処理工程、鋼板上にMgOコーティングを施してから雰囲気が100%H2、温度が1200℃の条件で20時間の高温焼鈍を行う工程、絶縁コーティングの塗布および加熱延伸平坦化焼鈍を行ってから方向性ケイ素鋼完成品を得る工程。
本実施形態2では、実施形態1と同様の製造工程を採用し、冷間圧延の厚さが0.29mmであった。連続脱炭焼鈍ラインは、本発明の実施例に係る冷間圧延鋼帯の急速加熱装置を使用し、連続脱炭焼鈍ライン速度が90m/minであった。第1加熱帯と第2加熱帯との間に1つの多波長の第1板温度計が設けられ、第2加熱帯と第3加熱帯との間に1つの多波長の第2板温度計が設けられ、第3加熱帯与第4加熱帯との間に2つの多波長の第3板温度計が設けられた。ここで、表2では異なる誘導加熱電力制御方式での板温状況を統計した。
本実施形態3は、実施形態1と同様の製造工程を採用するが、第2加熱帯および第3加熱帯の制御方式を変更したものである。ここで、比較例7と比較例8では、従来の輻射管加熱方式を採用し、比較例9~比較例11では、いずれも中国特許(CN101652485A)の焼鈍設備の加熱方式を採用した。実施例9~比較例13では、本発明の実施例に係る冷間圧延鋼帯の急速加熱装置により加熱し、第1誘導加熱機構を設置し、板温フィードバック電力制御方式を採用し、第2誘導加熱機構がインピーダンス補償電力制御方式を採用した。上記試験の試験データを採取することにより、表3を得た。
Claims (10)
- 加熱ゾーンと均熱ゾーンと冷却ゾーンとを備える冷間圧延鋼帯の連続焼鈍設備であって、
前記加熱ゾーンが、被加熱鋼帯の移動方向に沿って順に、
前記鋼帯を、200℃から目標キュリー温度-100℃までの温度範囲に加熱する、ガス加熱または電気加熱による第1輻射加熱機構が設けられる第1加熱帯、
前記鋼帯を、300℃から前記目標キュリー温度-50℃までの温度範囲に加熱する、第1誘導コイルによる第1誘導加熱機構が設けられる第2加熱帯、
前記鋼帯を、前記目標キュリー温度-30℃から前記目標キュリー温度-3℃までの温度範囲に加熱する、第2誘導コイルによる第2誘導加熱機構が設けられる第3加熱帯、および
鋼帯を、前記目標キュリー温度よりも高い温度に加熱する、ガス加熱または電気加熱による第2輻射加熱機構が設けられる第4加熱帯、
に区画されることを特徴とする冷間圧延鋼帯の連続焼鈍設備。 - 前記第1加熱帯と前記第2加熱帯との間に少なくとも1つの多波長の第1板温度計が設けられ、前記第2加熱帯と前記第3加熱帯との間に少なくとも1つの多波長の第2板温度計が設けられ、前記第3加熱帯と前記第4加熱帯との間に少なくとも1つの多波長の第3板温度計が設けられていることを特徴とする請求項1に記載の冷間圧延鋼帯の連続焼鈍設備。
- 前記第1誘導加熱機構が、順次接続された第1整流器と、第1インバータと、第1誘導コイルを含む第1発振回路とを備え、前記第1インバータが、前記第1整流器から供給される第1直流電力を受けて第1高周波電流に変換して前記第1発振回路に供給するものであり、
前記第2誘導加熱機構が、順次接続された第2整流器と、第2インバータと、第2誘導コイルを含む第2発振回路とを備え、前記第2インバータが、前記第2整流器から供給される第2直流電力を受けて第2高周波電流に変換して前記第2発振回路に供給するものであることを特徴とする請求項1に記載の冷間圧延鋼帯の連続焼鈍設備。 - 前記第1誘導加熱機構と第2誘導加熱機構の電流周波数の範囲が100~1000KHzであることを特徴とする請求項1に記載の冷間圧延鋼帯の連続焼鈍設備。
- 請求項1~4のいずれか1項に記載の冷間圧延鋼帯の連続焼鈍設備を用いて被加熱鋼帯を加熱することを特徴とする冷間圧延鋼帯の連続焼鈍方法。
- 第1加熱帯出口における第1目標板温を400~550℃とすることを特徴とする請求項5に記載の冷間圧延鋼帯の連続焼鈍方法。
- 第3加熱帯の昇温速度に応じて第2加熱帯出口における第2目標板温を設定し、前記第3加熱帯の昇温速度を50~150℃/sとすることを特徴とする請求項5に記載の冷間圧延鋼帯の連続焼鈍方法。
- 前記第2加熱帯の電力制御方法として、前記第2目標板温と第2板温度計の検出値との比較結果に基づき、前記第2加熱帯の加熱電力を調整することを特徴とする請求項7に記載の冷間圧延鋼帯の連続焼鈍方法。
- 前記第3加熱帯の電力制御方法として、前記第3加熱帯の初期電力と前記第3加熱帯出口における第3目標板温を設定し、前記第3目標板温と第3板温度計の検出値との比較結果に基づき、前記初期電力に応じて前記第3加熱帯の加熱電力を調整することを特徴とする請求項5に記載の冷間圧延鋼帯の連続焼鈍方法。
- 前記第3加熱帯の電力制御方法として、前記第3加熱帯の目標インピーダンスを設定し、前記目標インピーダンスと前記第3加熱帯の動作インピーダンスとの比較結果に基づき、前記第3加熱帯の加熱電力を調整することを特徴とする請求項5に記載の冷間圧延鋼帯の連続焼鈍方法。
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