JPH10265826A - Method for adjusting nitrogen content in nitrogen-containing steel - Google Patents
Method for adjusting nitrogen content in nitrogen-containing steelInfo
- Publication number
- JPH10265826A JPH10265826A JP7334897A JP7334897A JPH10265826A JP H10265826 A JPH10265826 A JP H10265826A JP 7334897 A JP7334897 A JP 7334897A JP 7334897 A JP7334897 A JP 7334897A JP H10265826 A JPH10265826 A JP H10265826A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- nitrogen
- steel
- tundish
- molten steel
- 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.)
- Pending
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、含窒素鋼における
窒素含有量の調整方法、特にＲＨ真空脱ガス装置とタン
ディッシュとの２段階で調整することにより、操業上の
トラブルを引き起こすことなく正確な鋼中窒素含有量の
制御を行う方法に関するものである。The present invention relates to a method for adjusting the nitrogen content of a nitrogen-containing steel, in particular, by adjusting the nitrogen content in two stages, a RH vacuum degassing apparatus and a tundish, without causing troubles in operation. The present invention relates to a method for controlling the nitrogen content in steel.
【０００２】[0002]
【従来の技術】近年、高清浄鋼への要求が高まり、非金
属介在物や水素含有量の低い鋼が求められている。こう
した鋼は、ＲＨ真空脱ガス装置による真空精錬を施すの
が普通である。ところで、珪素鋼などのようにインヒビ
ター形成元素として窒素を添加した含窒素鋼を製造しよ
うとする場合、このＲＨ真空脱ガス処理に当たって、鋼
中の窒素量がその真空精錬時に低下するという問題点が
あった。このような問題点に対し、従来、特公平２−22
5615号公報や特開昭63−282208号公報などでは、ＲＨ真
空脱ガス槽内の真空度を低下させて脱窒反応を抑制した
上で環流用ガスとしてＮ 2 ガスを用いて吸窒させるとい
う方法を提案している。2. Description of the Related Art In recent years, the demand for highly clean steel has been
There is a demand for steels with low content of metal inclusions and hydrogen. like this
The refined steel is subjected to vacuum refining by RH vacuum degassing equipment.
Is common. By the way, inhibitors such as silicon steel
A nitrogen-containing steel with nitrogen added as a
In the case of this RH vacuum degassing,
The problem is that the amount of nitrogen in
there were. In response to such problems,
No. 5615 and JP-A-63-282208 disclose RH
Reduced the degree of vacuum in the empty degassing tank to suppress the denitrification reaction
N as the reflux gas above TwoIt is possible to absorb nitrogen by using gas
We propose a method.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記各
従来技術の場合は、ＲＨ真空脱ガス装置の攪拌用環流ガ
スを単Ｎ2 ガスに切り換えるだけで最終的な所望の鋼中
窒素含有量にする方法であるから、正確な調整が難しく
成分的中率が悪いという問題点があった。また、これら
の従来技術の場合、各精錬時に予め窒素吸収速度や脱窒
素速度を推定しておく必要がある。というのは、溶鋼の
窒素濃度を測定するには、熱伝導定量法によるのが普通
であるが、この測定には時間がかかるため、どうしても
推定値に頼らざるを得ないのが実情である。ところが、
実際の溶鋼窒素濃度は、真空脱ガス槽内の真空度の変化
や浸漬管からのエヤーリーク量によってバラツキがあ
り、推定値どうりでないことから、しばしば操業上のト
ラブルを招き、また、高い成分的中率で鋼中窒素含有量
を調整することは困難であった。However, in the case of each of the above-mentioned prior arts, the desired desired nitrogen content in the steel is obtained only by switching the reflux gas for stirring of the RH vacuum degassing device to single N 2 gas. Because of this method, there was a problem that accurate adjustment was difficult and the component ratio was poor. Further, in the case of these conventional techniques, it is necessary to estimate a nitrogen absorption rate and a denitrification rate in advance at each refining. This is because the measurement of the nitrogen concentration in molten steel is usually carried out by a heat conduction quantification method, but since this measurement takes a long time, the fact is that it is absolutely necessary to rely on the estimated value. However,
The actual molten steel nitrogen concentration varies depending on changes in the degree of vacuum in the vacuum degassing tank and the amount of air leak from the immersion tube, and is not the estimated value. It was difficult to adjust the nitrogen content in steel at a moderate rate.
【０００４】本発明の主たる目的は、鋼中窒素含有量を
正確に的中させるための方法を提案することにある。本
発明の他の目的は、粗調整と微調整との２段階に分けて
調整することにより、操業トラブルを引き起こすことな
く的中率の高い窒素含有量制御を行う方法を提案するこ
とにある。[0004] The main object of the present invention is to propose a method for accurately determining the nitrogen content in steel. Another object of the present invention is to propose a method of performing a nitrogen content control with a high hit ratio without causing an operation trouble by performing adjustment in two stages of a coarse adjustment and a fine adjustment.
【０００５】[0005]
【課題を解決するための手段】本発明は、従来技術が現
在抱えている上述した問題点を解決する方法につき鋭意
研究した結果、ＲＨ真空脱ガス処理時に粗調整を行い、
この脱ガス処理終了時の鋼中窒素濃度に応じ、次に連鋳
タンディッシュの段階で微調整することが有効であると
の知見を得て、本発明を開発した。SUMMARY OF THE INVENTION The present invention has been studied as to how to solve the above-mentioned problems that the prior art has at present.
The present invention was developed based on the finding that it is effective to make a fine adjustment at the stage of the continuous casting tundish in accordance with the nitrogen concentration in the steel at the end of the degassing treatment.
【０００６】すなわち、本発明は、含窒素鋼用溶鋼中の
窒素濃度を、真空脱ガス処理終了時点の溶鋼中窒素濃度
に応じ、タンディッシュの上ノズルから吹き込むＮ2 ガ
スおよびArガスの吹込み量を制御して最終調整すること
を特徴とする含窒素鋼における窒素含有量の調整方法で
ある。また、本発明においては、取鍋内製錬溶鋼の窒素
濃度に応じ、まず、ＲＨ真空脱ガス処理時における攪拌
用環流ガスとしてのＮ2 ガスおよびArガスの吹込み量を
制御することにより該脱ガス処理終了時点の鋼中窒素濃
度を粗調整し、次いで、このときの窒素濃度に応じてタ
ンディッシュの上ノズルから吹き込むＮ2 ガスとArガス
との混合比を制御することにより、溶鋼中の窒素濃度を
微調整することが好ましい。また、本発明においては、
攪拌用環流ガスとして、まず窒素ガスを吹込み、次いで
製錬溶鋼の窒素濃度に応じてArガスに切り換えることに
より、鋼中窒素濃度を粗調整することが好ましい。ま
た、本発明においては、タンディッシュの上ノズルから
吹き込む混合ガスは、吹込み量が該上ノズルを通過する
溶鋼量に対して、８Nl／ｔ以下となるように制御するこ
とが好ましい。That is, according to the present invention, the nitrogen concentration in the molten steel for nitrogen-containing steel is changed according to the nitrogen concentration in the molten steel at the end of the vacuum degassing treatment, by blowing N 2 gas and Ar gas blown from the upper nozzle of the tundish. This is a method for adjusting the nitrogen content in the nitrogen-containing steel, wherein the final adjustment is performed by controlling the amount. Further, in the present invention, the amount of N 2 gas and Ar gas as a reflux gas for stirring is controlled at the time of the RH vacuum degassing process by controlling the blowing amount of N 2 gas and Ar gas in accordance with the nitrogen concentration of the molten steel in the ladle. By roughly adjusting the nitrogen concentration in the steel at the end of the degassing process, and then controlling the mixing ratio of N 2 gas and Ar gas blown from the upper nozzle of the tundish according to the nitrogen concentration at this time, It is preferable to finely adjust the nitrogen concentration of the above. In the present invention,
It is preferable to roughly adjust the nitrogen concentration in steel by injecting nitrogen gas as the reflux gas for stirring first, and then switching to Ar gas in accordance with the nitrogen concentration of the molten steel. Further, in the present invention, it is preferable to control the mixed gas blown from the upper nozzle of the tundish so that the blow amount is 8 Nl / t or less with respect to the amount of molten steel passing through the upper nozzle.
【０００７】[0007]
【発明の実施の形態】上述したように本発明は、溶鋼中
の窒素濃度をＲＨ真空脱ガス処理時の攪拌用環流ガスに
て粗調整し、その後、連鋳タンディッシュの上ノズルか
ら、ノズル詰まり防止用ガスとして吹き込むArガスとＮ
2 ガスの混合ガスの混合比を制御して最終成分に的中す
るように微調整するという２段階にわたる調整方法であ
り、このようなな方法によれば、正確で操業上のトラブ
ルを引き起こすことなく目標成分組成に調整することが
可能である。DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, in the present invention, the nitrogen concentration in molten steel is roughly adjusted by a reflux gas for stirring at the time of RH vacuum degassing, and then the nozzle is continuously moved from the upper nozzle of the continuous casting tundish to the nozzle. Ar gas and N injected as clogging prevention gas
This is a two-stage adjustment method in which the mixture ratio of the two gases is controlled and fine-tuned so as to hit the final component. According to such a method, it is accurate and causes trouble in operation. It is possible to adjust the composition of the target component without the need.
【０００８】図１は、連鋳タンディッシュの一例であ
り、図示の１は取鍋、２はタンディッシュ、３はタンデ
ィッシュ上ノズル、４はノズル詰まり防止用ガス吹き込
みパイプ、５は鋳型である。FIG. 1 shows an example of a continuous casting tundish, wherein 1 is a ladle, 2 is a tundish, 3 is a nozzle on the tundish, 4 is a gas blowing pipe for preventing nozzle clogging, and 5 is a mold. .
【０００９】本発明にかかる方法は、たとえば鋼中の窒
素含有量を85ppm にしようとする場合、第１段階のＲＨ
真空脱ガス処理において粗調整する溶鋼の窒素濃度のレ
ベルは、75〜85ppm の範囲にする。というのは、発明者
らの研究によると、図２に示すように、タンディッシュ
の上ノズルから吹き込む混合ガス量がノズル通過溶鋼量
当たり８Nl／ｔを超えると窒素吸収効率が著しく低下し
制御精度が低下するので、第二段階での微調整幅を大き
くすることができないからである。一方で、図３に示す
ように、タンディッシュの上ノズルからＮ2 ガスを吹き
込む場合、その混合ガス吹込み量 (全量をＮ 2 として計
算) が溶鋼トン当たり８Nl／ｔのときに、鋼中のＮ2 は
10ppm 上昇することがわかる。従って、目標成分を85pp
m とする場合に、成分的中率を上げるべく正確な制御を
行うためには、どうしても粗調整段階 (ＲＨ真空脱ガス
処理終了時点) での溶鋼窒素濃度を最終成分の窒素濃度
−５±５ppm 程度に調整することが望ましいと言える。[0009] The method according to the present invention can be used, for example, in nitrogen in steel.
If the elemental content is to be 85 ppm, the first stage RH
Level of nitrogen concentration in molten steel to be roughly adjusted in vacuum degassing
The bell should be in the range of 75-85 ppm. Because the inventor
According to their research, as shown in Figure 2, tundish
The amount of mixed gas blown from the upper nozzle is the amount of molten steel passing through the nozzle
If it exceeds 8 Nl / t, the nitrogen absorption efficiency will decrease significantly.
Since the control accuracy decreases, increase the fine adjustment width in the second stage.
Because it cannot be done. Meanwhile, shown in FIG.
So, from the top nozzle of the tundish, NTwoBlowing gas
When injecting the mixed gas, TwoAs a total
Is 8 Nl / t per ton of molten steel when NTwoIs
It can be seen that it increases by 10 ppm. Therefore, the target component is 85pp
m, precise control is required to increase the component predictive value.
In order to perform it, it is absolutely necessary to perform the rough adjustment stage (RH
The nitrogen concentration of the final component
It can be said that it is desirable to adjust to about -5 ± 5 ppm.
【００１０】なお、本発明においては、タンディッシュ
上ノズルより吹き込むArガス・Ｎ2ガスの混合ガスの総
量を、図２に示すように、ノズル通過溶鋼量に対し８Nl
／ｔに限定するが、これは、この混合ガス量が８Nl／ｔ
を超えると吹込みガスが溶鋼中からタンディッシュ上部
に吹き抜けることがあり、溶鋼への窒素吸収率が不安定
となり、正確な成分調整ができなくなるからである。In the present invention, the total amount of the mixed gas of Ar gas and N 2 gas blown from the nozzle above the tundish is, as shown in FIG.
/ T, but this is because the mixed gas amount is 8Nl / t
If the pressure exceeds, the blown gas may blow from the molten steel to the upper part of the tundish, and the nitrogen absorption rate into the molten steel becomes unstable, so that accurate component adjustment cannot be performed.
【００１１】[0011]
【実施例】この実施例は、Ｃ＝0.07wt％, Si= 3.5 wt％
の珪素鋼用含窒素溶鋼を、まずＲＨ真空脱ガスで処理し
た。この脱ガス処理開始時の溶鋼温度は1585℃、溶鋼量
は180t、脱ガス処理開始から20分間攪拌用環流ガスとし
てＮ2 ガスを1800Nl/min.吹き込んだ。その後、上記環
流ガスをArガスに切り換え、Arガスを1800Nl/min.10分
間吹き込む脱ガス処理をした。この脱ガス処理前の取鍋
内溶鋼の窒素濃度は90ppm で、この値は脱ガス処理を開
始して20分経過後に判明した。また、この脱ガス処理終
了時点の鋼中窒素濃度は78ppm 、温度は1550℃であっ
た。次に、上記脱ガス処理後の窒素濃度分析結果から、
タンディッシュの上ノズルからＮ2 ガス：11Nl/min. ,
Arガス：4 Nl/min. の割合で混合した混合ガスを吹き込
んだ。図４に、各調整段階の鋼中 [Ｎ] wt％の推移につ
いて示す。EXAMPLE In this example, C = 0.07 wt%, Si = 3.5 wt%
Was first treated by RH vacuum degassing. The temperature of the molten steel at the start of the degassing treatment was 1585 ° C., the amount of the molten steel was 180 t, and 1800 Nl / min. Of N 2 gas was blown in as a reflux gas for stirring for 20 minutes from the start of the degassing treatment. Thereafter, the reflux gas was switched to Ar gas, and degassing was performed by blowing Ar gas at 1800 Nl / min. For 10 minutes. The nitrogen concentration of the molten steel in the ladle before this degassing treatment was 90 ppm, and this value was found 20 minutes after the start of the degassing treatment. The nitrogen concentration in the steel at the end of this degassing treatment was 78 ppm, and the temperature was 1550 ° C. Next, from the nitrogen concentration analysis results after the degassing process,
N 2 gas from the upper nozzle of the tundish: 11 Nl / min.,
Ar gas: A mixed gas mixed at a rate of 4 Nl / min. Was blown. FIG. 4 shows the transition of [N] wt% in steel at each adjustment stage.
【００１２】そこで、連続鋳造後の鋳片から試料を採取
し分析したところ、鋼中の窒素含有量は85ppm と目標成
分どおりの値を示した。図５は、ＲＨ真空脱ガス装置の
攪拌用環流ガスをＮ2 ガスとし、最終窒素含有量をこの
Ｎ2 ガス制御のみで調整した従来方法と、本発明方法と
を、目標鋼中 [Ｎ] と実績鋼中［Ｎ］との関係で示した
ものであるが、本発明方法の方が狭い範囲で調整ができ
ることがわかった。つまり、本発明方法の方がはるかに
高い精度で鋼中窒素含有量の調整ができることがわかっ
た。Therefore, when a sample was taken from the slab after continuous casting and analyzed, the nitrogen content in the steel was 85 ppm, which was a value corresponding to the target component. FIG. 5 shows that the conventional method in which the reflux gas for stirring of the RH vacuum degassing apparatus is N 2 gas and the final nitrogen content is adjusted only by this N 2 gas control, and the method of the present invention are the target steel [N] The results are shown in the relationship between [N] and the actual steel, and it was found that the method of the present invention can be adjusted in a narrower range. That is, it was found that the method of the present invention can adjust the nitrogen content in steel with much higher accuracy.
【００１３】[0013]
【発明の効果】以上説明したように本発明によれば、Ｒ
Ｈ真空脱ガス処理の粗調整とこの処理終了時点の鋼中窒
素濃度に応じて連鋳タンディッシュの上ノズルから吹き
込むガスの窒素混合量を変える微調整との２段階の調整
を行うことにより、効率よく調整するようにしたので、
鋼中窒素含有量を高い精度で的中させることが可能であ
る。As described above, according to the present invention, R
By performing a two-stage adjustment of the rough adjustment of the H vacuum degassing process and the fine adjustment of changing the nitrogen mixture amount of the gas blown from the upper nozzle of the continuous casting tundish according to the nitrogen concentration in the steel at the end of this process, Because I adjusted it efficiently,
It is possible to hit the nitrogen content in steel with high accuracy.
【図１】連鋳タンディッシュの概略を示す断面図。FIG. 1 is a sectional view schematically showing a continuous casting tundish.
【図２】タンディッシュノズルから吹き込む混合ガス量
と窒素吸収効率との関係を示すグラフ。FIG. 2 is a graph showing the relationship between the amount of mixed gas blown from a tundish nozzle and nitrogen absorption efficiency.
【図３】タンディッシュノズルからのＮ2 ガス量と鋼中
［Ｎ］上昇量との関係を示すグラフ。FIG. 3 is a graph showing the relationship between the amount of N 2 gas from a tundish nozzle and the amount of [N] rise in steel.
【図４】実施例の窒素濃度変化を示すグラフ。FIG. 4 is a graph showing a change in nitrogen concentration in an example.
【図５】実施例における目標窒素濃度と実績窒素濃度と
の関係を示すグラフ。FIG. 5 is a graph showing a relationship between a target nitrogen concentration and an actual nitrogen concentration in an example.
１ 取鍋 ２ タンディッシュ ３ タンディッシュ上ノズル ４ ガス吹き込みパイプ ５ 鋳型 DESCRIPTION OF SYMBOLS 1 Ladle 2 Tundish 3 Tundish upper nozzle 4 Gas blowing pipe 5 Mold
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｂ２２Ｄ 41/58 Ｂ２２Ｄ 41/58 Ｃ２１Ｃ 7/10 Ｃ２１Ｃ 7/10 Ａ (72)発明者 蓮沼 純一 岡山県倉敷市水島川崎通１丁目 （番地な し） 川崎製鉄株式会社水島製鉄所内 (72)発明者 朝穂 隆一 岡山県倉敷市水島川崎通１丁目 （番地な し） 川崎製鉄株式会社水島製鉄所内──────────────────────────────────────────────────の Continuation of front page (51) Int.Cl. 6 Identification code FI B22D 41/58 B22D 41/58 C21C 7/10 C21C 7/10 A (72) Inventor Junichi Hasunuma 1 Mizushima Kawasaki-dori Mizushima Kurashiki City, Okayama Prefecture Chome (without address) Mizushima Works, Kawasaki Steel Corporation (72) Inventor Ryuichi Asa 1-chome, Mizushima, Kawasaki-dori, Kurashiki City, Okayama Prefecture (without address) Mizushima Works, Kawasaki Steel Corporation
Claims (4)
ガス処理終了時点の溶鋼中窒素濃度に応じ、タンディッ
シュの上ノズルから吹き込むＮ2 ガスおよびArガスの吹
込み量を制御して最終調整することを特徴とする含窒素
鋼における窒素含有量の調整方法。The amount of N 2 gas and Ar gas blown from the upper nozzle of a tundish is controlled according to the nitrogen concentration in the molten steel for nitrogen-containing steel according to the nitrogen concentration in the molten steel at the end of the vacuum degassing process. And finally adjusting the nitrogen content in the nitrogen-containing steel.
ず、ＲＨ真空脱ガス処理時における攪拌用環流ガスとし
てのＮ2 ガスおよびArガスの吹込み量を制御することに
より該脱ガス処理終了時点の鋼中窒素濃度を粗調整し、
次いで、このときの窒素濃度に応じてタンディッシュの
上ノズルから吹き込むＮ2 ガスとArガスとの混合比を制
御することにより、溶鋼中の窒素濃度を微調整すること
を特徴とする請求項１記載の調整方法。2. In accordance with the nitrogen concentration of smelting steel in a ladle, first, the amount of N 2 gas and Ar gas blown as a reflux gas for stirring during RH vacuum degassing is controlled to control the degassing. Rough adjustment of the nitrogen concentration in steel at the end of processing,
Then, the nitrogen concentration in the molten steel is finely adjusted by controlling the mixing ratio of N 2 gas and Ar gas blown from the upper nozzle of the tundish according to the nitrogen concentration at this time. The adjustment method described.
吹込み、次いで製錬溶鋼の窒素濃度に応じてArガスに切
り換えることにより、鋼中窒素濃度を粗調整することを
特徴とする請求項１または２に記載の調整方法。3. The nitrogen concentration in the steel is roughly adjusted by first blowing nitrogen gas as the reflux gas for stirring and then switching to Ar gas in accordance with the nitrogen concentration of the molten steel. 3. The adjustment method according to 1 or 2.
混合ガスは、吹込み量が該上ノズルを通過する溶鋼量に
対して、８Nl／ｔ以下となるように制御することを特徴
とする請求項１〜３のいずれか１項に記載の調整方法。4. The mixed gas blown from the upper nozzle of the tundish is controlled so that the blow rate is 8 Nl / t or less with respect to the amount of molten steel passing through the upper nozzle. 4. The adjustment method according to any one of items 3 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7334897A JPH10265826A (en) | 1997-03-26 | 1997-03-26 | Method for adjusting nitrogen content in nitrogen-containing steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7334897A JPH10265826A (en) | 1997-03-26 | 1997-03-26 | Method for adjusting nitrogen content in nitrogen-containing steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10265826A true JPH10265826A (en) | 1998-10-06 |
Family
ID=13515576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7334897A Pending JPH10265826A (en) | 1997-03-26 | 1997-03-26 | Method for adjusting nitrogen content in nitrogen-containing steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10265826A (en) |
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| WO2019044292A1 (en) * | 2017-08-30 | 2019-03-07 | Ｊｆｅスチール株式会社 | Continuous casting method for steel and method for manufacturing thin steel plate |
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| CN114107608A (en) * | 2021-11-02 | 2022-03-01 | 北京首钢股份有限公司 | Method for controlling nitrogen content in external refining |
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-
1997
- 1997-03-26 JP JP7334897A patent/JPH10265826A/en active Pending
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|---|---|---|---|---|
| JP2014128822A (en) * | 2012-12-28 | 2014-07-10 | Kobe Steel Ltd | Method for manufacturing high nitrogen steel |
| WO2019044292A1 (en) * | 2017-08-30 | 2019-03-07 | Ｊｆｅスチール株式会社 | Continuous casting method for steel and method for manufacturing thin steel plate |
| JP6493635B1 (en) * | 2017-08-30 | 2019-04-03 | Ｊｆｅスチール株式会社 | Method of continuous casting of steel and method of manufacturing thin steel sheet |
| CN111032248A (en) * | 2017-08-30 | 2020-04-17 | 杰富意钢铁株式会社 | Method for continuously casting steel and method for manufacturing thin steel plate |
| CN111032248B (en) * | 2017-08-30 | 2021-11-09 | 杰富意钢铁株式会社 | Method for continuously casting steel and method for manufacturing thin steel plate |
| CN108067598A (en) * | 2018-01-03 | 2018-05-25 | 河钢股份有限公司承德分公司 | The method for reducing low-carbon low-silicon steel continuous casting head stove nitrogen in steel content |
| CN112676544A (en) * | 2020-12-11 | 2021-04-20 | 北京首钢股份有限公司 | Nitrogen increasing method in high-nitrogen steel continuous casting process |
| CN114107608A (en) * | 2021-11-02 | 2022-03-01 | 北京首钢股份有限公司 | Method for controlling nitrogen content in external refining |
| CN117701829A (en) * | 2024-02-06 | 2024-03-15 | 包头市威丰稀土电磁材料股份有限公司 | Nitrogen control method for oriented silicon steel |
| CN117701829B (en) * | 2024-02-06 | 2024-04-26 | 包头市威丰稀土电磁材料股份有限公司 | Nitrogen control method for oriented silicon steel |
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