JP3322806B2 - Fine dispersion method of oxides in steel - Google Patents
Fine dispersion method of oxides in steelInfo
- Publication number
- JP3322806B2 JP3322806B2 JP25352896A JP25352896A JP3322806B2 JP 3322806 B2 JP3322806 B2 JP 3322806B2 JP 25352896 A JP25352896 A JP 25352896A JP 25352896 A JP25352896 A JP 25352896A JP 3322806 B2 JP3322806 B2 JP 3322806B2
- Authority
- JP
- Japan
- Prior art keywords
- deoxidation
- oxides
- steel
- fine
- continuous cast
- 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.)
- Expired - Fee Related
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、大型介在物やクラ
スター状介在物の発生を抑止して、鋼中に酸化物を微細
分散させる方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for finely dispersing an oxide in steel while suppressing the generation of large inclusions and cluster-like inclusions.
【０００２】[0002]
【従来の技術】鋼材の材質を向上させる方法として、大
きさが０．５〜５μｍの微細な脱酸生成物（酸化物）を
鋼材内に分散させ、これを変態、析出物の核として利用
する技術が知られている。2. Description of the Related Art As a method for improving the quality of a steel material, a fine deoxidation product (oxide) having a size of 0.5 to 5 .mu.m is dispersed in the steel material and used as a core of transformation and precipitate. Techniques for doing so are known.
【０００３】特願平１−２２７５７０にはＺｒを脱酸剤
として用いる鋼中の酸化物微細分散法が、また特開平３
−２６７３１１号、特開平４−２７１３号公報にはＴ
ｉ，Ｚｒ，Ｃａを脱酸剤として用いる鋼中の酸化物微細
分散法が、また特開平４−１９１３１４号公報にはＴｉ
を脱酸剤として用いる鋼中の酸化物微細分散法が記載さ
れている。Japanese Patent Application No. 1-227570 discloses a method of finely dispersing oxides in steel using Zr as a deoxidizing agent.
-267311, JP-A-4-2713 discloses T
A method of finely dispersing oxides in steel using i, Zr, and Ca as deoxidizing agents is disclosed in Japanese Patent Application Laid-Open No. 4-191314.
Describes a method for finely dispersing oxides in steel using as a deoxidizing agent.
【０００４】格別な工夫を施さないで製造した連続鋳造
鋳片は、その表層近傍では０．５〜５μｍの微細酸化物
の密度は高い。しかしその内部、例えば板厚の１／２の
鋳片の中心部では微細酸化物の密度は低く、大型介在物
やクラスター状介在物が多い。このため表層部の金属組
織と中心部の金属組織とが不均一な鋼材となる。[0004] In continuous cast slabs manufactured without special measures, the density of fine oxides of 0.5 to 5 µm is high near the surface layer. However, in the inside thereof, for example, at the center of a slab having a thickness of 1/2, the density of the fine oxide is low, and there are many large inclusions and cluster-like inclusions. For this reason, the metal structure of the surface layer portion and the metal structure of the central portion are non-uniform steel materials.
【０００５】[0005]
【発明が解決しようとする課題】前記の各公報には、鋳
片の表層近傍にも内部にも微細酸化物を高い密度で発生
させる脱酸法が記載されている。本発明は、前記の各公
報と同様の効果を奏する事が可能で、前記各公報とは異
なる新たな鋼中の酸化物の微細分散法の提供を課題とし
ている。In each of the above publications, there is described a deoxidation method in which fine oxides are generated at a high density both in the vicinity of and inside the surface layer of a slab. An object of the present invention is to provide a new method for finely dispersing oxides in steel different from those disclosed in each of the above publications.
【０００６】[0006]
【課題を解決するための手段】即ち本発明は、（１）Ｍ
ｎ及びＳｉを用いて予め脱酸したＣ：０．０５〜０．２
０％，Ｍｎ：０．３０〜１．８０％，Ｓｉ：０．１０〜
０．３０％の溶鋼にＴｉ脱酸を行い更にその後にＭｇ脱
酸を施し、Ｔｉ：０．００５〜０．０２％，Ｍｇ：０．
００１〜０．０１５％とすることにより、大きさが０．
５〜５μｍの酸化物を連続鋳造鋳片の全ての部分に５０
ヶ／ｍｍ2以上の密度に分布せしめたことを特徴とす
る、鋼中の酸化物の微細分散法である。That is, the present invention provides (1) M
C previously deoxidized using n and Si: 0.05 to 0.2
0%, Mn: 0.30 to 1.80%, Si: 0.10
0.30% of molten steel is subjected to Ti deoxidation, and then to Mg deoxidation. Ti: 0.005 to 0.02%, Mg: 0.
By setting the amount to 001 to 0.015%, the size is set to 0.1.
Apply 5-5 μm of oxide to all parts of the continuous cast slab.
This is a method for finely dispersing oxides in steel, characterized in that the oxides are distributed at a density of at least 1 / mm 2 .
【０００７】また（２）連続鋳造鋳片が、板厚が１００
ｍｍ以下の連続鋳造鋳片であることを特徴とする、前記
（１）に記載の鋼中の酸化物の微細分散法である。(2) The continuous cast slab has a thickness of 100
(1) The method for finely dispersing oxides in steel according to the above (1), wherein the method is a continuous cast slab of not more than mm.
【０００８】また（３）連続鋳造鋳片が、溶接性が良好
な厚板を製造するための連続鋳造鋳片であることを特徴
とする、前記（１）または（２）に記載の鋼中の酸化物
の微細分散法である。(3) The steel according to (1) or (2), wherein the continuous cast slab is a continuous cast slab for producing a thick plate having good weldability. Is a method of finely dispersing an oxide.
【０００９】本発明では、Ｍｎ及びＳｉを用いて予め脱
酸し、Ｃ：０．０５〜０．２０％，Ｍｎ：０．３０〜
１．８０％，Ｓｉ０．１０〜０．３０％の溶鋼とする。
この脱酸は、例えば出鋼や真空処理や仕上精錬に際して
合金を溶湯に添加して行う。Ｃが０．０５％未満、Ｍｎ
が０．３０％未満では厚板にした際の強度が不十分であ
り、またＣが０．２０％超、Ｍｎが１．８０％超では厚
板にした際の溶接性が不十分となる。In the present invention, Mn and Si are previously deoxidized, and C: 0.05 to 0.20% and Mn: 0.30 to 0.30%.
1.80%, Si 0.10 to 0.30% molten steel.
This deoxidation is performed, for example, by adding the alloy to the molten metal at the time of tapping, vacuum treatment, or finish refining. C is less than 0.05%, Mn
If less than 0.30%, the strength when formed into a thick plate is insufficient, and if C exceeds 0.20% and Mn exceeds 1.80%, the weldability when formed into a thick plate becomes insufficient. .
【００１０】Ａｌを脱酸剤として用いると大型介在物や
クラスター状の介在物が発生し易いために、本発明で
は、脱酸にはＡｌを使用しない。本発明では、後で行う
Ｔｉ脱酸、Ｍｇ脱酸におけるＴｉ，Ｍｇの歩留りを安定
にするために、Ｓｉは０．１０〜０．３０％にしてお
く。When Al is used as a deoxidizing agent, large inclusions and cluster-like inclusions are easily generated, and therefore, in the present invention, Al is not used for deoxidation. In the present invention, the content of Si is set to 0.10 to 0.30% in order to stabilize the yield of Ti and Mg in the subsequent Ti deoxidation and Mg deoxidation.
【００１１】本発明は、次に、溶鋼にＴｉ脱酸を行い更
にその後にＭｇ脱酸を施し、溶鋼のＴｉを０．００５〜
０．０２％に、Ｍｇを０．００１〜０．０１５％に調整
する。Ｔｉは溶鋼の凝固に際して微細な２次脱酸生成物
を形成する。即ちＴｉは、溶鋼の凝固速度が大きい連続
鋳造鋳片の表層近傍に微細な脱酸生成物を高い密度に形
成する。しかし凝固速度が小さくなる板厚の１／２近傍
の鋳片の中心部では微細な脱酸生成物の密度は激減す
る。According to the present invention, the molten steel is then subjected to Ti deoxidation, followed by Mg deoxidation, so that the molten steel has a Ti of 0.005 to 0.005.
Adjust to 0.02% and Mg to 0.001 to 0.015%. Ti forms a fine secondary deoxidation product upon solidification of molten steel. That is, Ti forms a fine deoxidation product at a high density near the surface layer of a continuous cast slab having a high solidification rate of molten steel. However, the density of fine deoxidation products is drastically reduced at the center of the slab near 1/2 of the plate thickness at which the solidification rate is low.
【００１２】Ｍｇは溶鋼に添加すると微細な一次酸化物
を形成する。本発明者の知見によると、Ｍｇ脱酸を行う
と、溶鋼の凝固速度が小さくなる鋳片の中心部に、この
Ｍｇの一次酸化物による微細な脱酸生成物を高い密度で
形成する。このため、本発明によりＴｉおよびＭｇで複
合脱酸をを行うと、凝固速度が大きい連続鋳造鋳片の表
層近傍にはＴｉの２次脱酸生成物である微細な脱酸生成
物が高い密度で形成され、かつ凝固速度が小さい連続鋳
造鋳片の中心部近傍にもＭｇの一次脱酸生成物である微
細な脱酸生成物が高い密度で形成されて、連続鋳造鋳片
の全ての部分に高い密度の微細な脱酸生成物を形成する
ことができる。Mg forms a fine primary oxide when added to molten steel. According to the knowledge of the present inventor, when Mg deoxidation is performed, a fine deoxidation product due to the primary oxide of Mg is formed at a high density in the central portion of the slab where the solidification rate of the molten steel decreases. Therefore, when complex deoxidation is performed with Ti and Mg according to the present invention, a fine deoxidation product, which is a secondary deoxidation product of Ti, has a high density near the surface layer of a continuously cast slab having a high solidification rate. In the vicinity of the center of the continuous cast slab having a low solidification rate, a fine deoxidation product, which is a primary deoxidation product of Mg, is formed at a high density, and all parts of the continuous cast slab are formed. A high density fine deoxidation product can be formed.
【００１３】Ｔｉが０．００５％未満、Ｍｇが０．００
１％未満では微細な脱酸生成物の形成密度が不十分とな
る。一方Ｔｉが０．０２％超、Ｍｇが０．０１５％超で
は大型介在物やクラスター状介在物が形成され易い。本
発明ではＴｉ脱酸を行いその後Ｍｇ脱酸を行う。Ｍｇ脱
酸を先に行うと、Ｍｇの歩留りが低く且つ歩留りの変動
が大きい。本発明によりＴｉ脱酸を行いその後Ｍｇ脱酸
を行うと、Ｔｉ脱酸により溶鋼中の酸素量が安定し、こ
のためＭｇ脱酸におけるＭｇの歩留りが高く且つ安定化
する。[0013] Ti is less than 0.005%, Mg is 0.00
If it is less than 1%, the formation density of fine deoxidation products becomes insufficient. On the other hand, if the content of Ti exceeds 0.02% and the content of Mg exceeds 0.015%, large inclusions and cluster-like inclusions are easily formed. In the present invention, Ti deoxidation is performed, and then Mg deoxidation is performed. If Mg deoxidation is performed first, the yield of Mg is low and the yield varies greatly. When Ti deoxidation is performed and then Mg deoxidation is performed according to the present invention, the oxygen content in the molten steel is stabilized by Ti deoxidation, and thus the yield of Mg in Mg deoxidation is high and stabilized.
【００１４】本発明者等の知見によると、大きさが０．
５〜５μｍの微細酸化物が全ての部分に５０ヶ／ｍｍ2
以上の密度で分布している連続鋳造鋳片は、鋳造組織が
微細であり、通常の１／２程度の圧下量の熱間圧延によ
って、通常と同様の優れた機械的性質を有する厚板にす
る事ができる。また本発明の鋳片より製造した厚板は、
微細酸化物が全ての部分に高い密度で分布し、このため
溶接に際しては溶接熱影響部における微細酸化物がフェ
ライト析出核となり靭性の優れた熱影響部を形成する。
このため本発明の方法で製造した連続鋳造鋳片を用いて
製造した厚板は、溶接性が良好である。According to the findings of the present inventors, the size is not more than 0.
Fine oxide of 5 to 5 μm is 50 / mm 2 on all parts.
The continuous cast slab distributed at the above density has a fine cast structure and is formed into a thick plate having the same excellent mechanical properties as usual by hot rolling with a reduction amount of about 1/2 of the usual amount. You can do it. Also, a thick plate manufactured from the slab of the present invention,
Fine oxides are distributed at a high density in all parts, so that at the time of welding, the fine oxides in the weld heat affected zone become ferrite precipitation nuclei to form a heat affected zone excellent in toughness.
Therefore, a thick plate manufactured using the continuous cast slab manufactured by the method of the present invention has good weldability.
【００１５】[0015]
【発明の実施の形態】本発明者等は、高周波溶解炉を用
いて表１のＮｏ１〜１０の各溶鋼をそれぞれ約３００ｋ
ｇ宛製造し、それぞれを水冷銅鋳型に注入し、厚さ：２
４０ｍｍ、幅：５００ｍｍ、高さ：３００ｍｍの鋳片と
した。この鋳片を切断し、検鏡観察により大きさが０．
５〜５μｍの微細酸化物の分布を調査した。その結果を
表２に示した。BEST MODE FOR CARRYING OUT THE INVENTION The present inventors used a high-frequency melting furnace to reduce each of the molten steels No. 1 to No.
g, each poured into a water-cooled copper mold, thickness: 2
It was a slab of 40 mm, width: 500 mm, and height: 300 mm. The slab was cut, and the size was reduced to 0.
The distribution of fine oxides of 5-5 μm was investigated. The results are shown in Table 2.
【００１６】[0016]
【表１】 [Table 1]
【００１７】[0017]
【表２】 [Table 2]
【００１８】表１及び表２にみられる如く、Ｔｉのみで
脱酸したＮｏ１，２は鋳片の一方の面からの距離が１０
ｍｍ以下あるいは２３０ｍｍ超の部分では微細酸化物の
量が多いが、６０ｍｍ〜１８０ｍｍの部分では微細酸化
物の量は少なく、特に１２０ｍｍの部分（板厚の１／２
の部分）では微細酸化物は激減している。一方本発明の
Ｎｏ３〜Ｎｏ１０は、６０ｍｍ〜１８０ｍｍの部分にも
また１２０ｍｍの部分（板厚の１／２の部分）にも、十
分な量の微細酸化物が形成されている。As can be seen from Tables 1 and 2, No. 1 and No. 2 deoxidized only with Ti have a distance from one surface of the slab of 10%.
mm or less than 230 mm, the amount of fine oxide is large, but in the range of 60 mm to 180 mm, the amount of fine oxide is small, particularly in the case of 120 mm (1/2 of the plate thickness).
), The amount of fine oxides has dropped sharply. On the other hand, in No. 3 to No. 10 of the present invention, a sufficient amount of fine oxide is formed both in the portion of 60 mm to 180 mm and in the portion of 120 mm (half of the plate thickness).
【００１９】本発明者等はまた、本発明の方法で表３の
Ｎｏ．１１〜１３の各溶鋼を製造し、それぞれを水冷銅
鋳型に注入し、厚さ：９０ｍｍ、幅：５００ｍｍ、高
さ：３００ｍｍの鋳片とした。この鋳片を切断し、検鏡
観察により大きさが０．５〜５μｍの微細酸化物の分布
を調査した。その結果を表４に示した。The present inventors have also found that the method of the present invention provides No. 3 in Table 3. Each molten steel of Nos. 11 to 13 was manufactured, and each was poured into a water-cooled copper mold to obtain a slab having a thickness of 90 mm, a width of 500 mm, and a height of 300 mm. The slab was cut, and the distribution of fine oxides having a size of 0.5 to 5 μm was examined by microscopic observation. Table 4 shows the results.
【００２０】[0020]
【表３】 [Table 3]
【００２１】[0021]
【表４】 [Table 4]
【００２２】表３に見られる如く、表３の化学分析値は
表１の本発明材の化学分析値と大きな相違はない。しか
し表４に見られる如く、表４の４５ｍｍの部分（板厚の
１／２の部分）の微細酸化物の個数は、表２の１２００
ｍｍの部分（板厚の１／２の部分）の酸化物の個数より
も多い。このように板厚が１００ｍｍ以下の鋳片におい
ては、微細酸化物の密度は、板厚が２４０ｍｍの鋳片の
場合よりも一層均一化されている。As can be seen from Table 3, the chemical analysis values in Table 3 are not significantly different from the chemical analysis values of the material of the present invention in Table 1. However, as can be seen from Table 4, the number of fine oxides in the 45 mm portion (half the plate thickness) in Table 4 is 1200 in Table 2.
The number is larger than the number of oxides in the mm portion (a half of the plate thickness). As described above, in the slab having a plate thickness of 100 mm or less, the density of the fine oxide is more uniform than in the slab having a plate thickness of 240 mm.
【００２３】[0023]
【発明の効果】本発明によると、連続鋳造鋳片の全ての
部分に、大きさが０．５〜５μｍの微細な酸化物を５０
ヶ／ｍｍ2以上の密度で分布する鋳片が得られる。連続
鋳造鋳片の板厚が１００ｍｍ以下の場合は微細な酸化物
の分布が更に均一になり好ましい。本発明の連続鋳造鋳
片を用いると溶接性が良好な厚板を製造することができ
る。According to the present invention, a fine oxide having a size of 0.5 to 5 .mu.m is applied to all portions of a continuous cast slab.
Slabs / mm 2 or more are obtained. When the thickness of the continuous cast slab is 100 mm or less, the distribution of fine oxides becomes more uniform, which is preferable. When the continuous cast slab of the present invention is used, a thick plate having good weldability can be manufactured.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平９−104944（ＪＰ，Ａ) 特開 平８−238544（ＪＰ，Ａ) 特開 平４−279248（ＪＰ，Ａ) 特開 平２−220735（ＪＰ，Ａ) 特開 昭61−284517（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C21C 7/06 B22D 11/116 C21C 7/00 C21C 7/04 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-104944 (JP, A) JP-A-8-238544 (JP, A) JP-A-4-279248 (JP, A) JP-A-2- 220735 (JP, A) JP-A-61-284517 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C21C 7/06 B22D 11/116 C21C 7/00 C21C 7/04
Claims (3)
０．０５〜０．２０％，Ｍｎ：０．３０〜１．８０％，
Ｓｉ：０．１０〜０．３０％の溶鋼にＴｉ脱酸を行ない
更にその後にＭｇ脱酸を施し、Ｔｉ：０．００５〜０．
０２％，Ｍｇ：０．００１〜０．０１５％とすることに
より、大きさが０．５〜５μｍの酸化物を連続鋳造鋳片
の全ての部分に５０ヶ／ｍｍ2以上の密度に分布せしめ
たことを特徴とする、鋼中の酸化物の微細分散法。C: pre-deoxidized with Mn and Si:
0.05 to 0.20%, Mn: 0.30 to 1.80%,
Si: 0.10 to 0.30% molten steel is subjected to Ti deoxidation, followed by Mg deoxidation, and Ti: 0.005 to 0.30%.
02%, Mg: 0.001 to 0.015%, oxides having a size of 0.5 to 5 μm are distributed at a density of 50 / mm 2 or more in all portions of the continuous cast slab. A method for finely dispersing oxides in steel.
連続鋳造鋳片であることを特徴とする、請求項１に記載
の鋼中の酸化物の微細分散法。2. The method for finely dispersing oxides in steel according to claim 1, wherein the continuous cast slab is a continuous cast slab having a thickness of 100 mm or less.
造するための連続鋳造鋳片であることを特徴とする、請
求項１または２に記載の鋼中の酸化物の微細分散法。3. The finely divided oxide in steel according to claim 1, wherein the continuous cast slab is a continuous cast slab for producing a thick plate having good weldability. Dispersion method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25352896A JP3322806B2 (en) | 1996-09-25 | 1996-09-25 | Fine dispersion method of oxides in steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25352896A JP3322806B2 (en) | 1996-09-25 | 1996-09-25 | Fine dispersion method of oxides in steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10102131A JPH10102131A (en) | 1998-04-21 |
| JP3322806B2 true JP3322806B2 (en) | 2002-09-09 |
Family
ID=17252630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25352896A Expired - Fee Related JP3322806B2 (en) | 1996-09-25 | 1996-09-25 | Fine dispersion method of oxides in steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3322806B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3504521B2 (en) * | 1998-12-15 | 2004-03-08 | 株式会社神戸製鋼所 | Spring steel with excellent fatigue properties |
| EP2292352B1 (en) | 1999-04-08 | 2014-05-14 | Nippon Steel & Sumitomo Metal Corporation | Method for processing molten steel for cast steel and steel material with excellent workability |
| KR100481365B1 (en) * | 2000-12-14 | 2005-04-08 | 주식회사 포스코 | Method of manufacturing steel plate to be precipitating TiN and TiO for welded structures |
-
1996
- 1996-09-25 JP JP25352896A patent/JP3322806B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10102131A (en) | 1998-04-21 |
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