JPH03267311A - Deoxidizing method in steel making stage - Google Patents
Deoxidizing method in steel making stageInfo
- Publication number
- JPH03267311A JPH03267311A JP6865590A JP6865590A JPH03267311A JP H03267311 A JPH03267311 A JP H03267311A JP 6865590 A JP6865590 A JP 6865590A JP 6865590 A JP6865590 A JP 6865590A JP H03267311 A JPH03267311 A JP H03267311A
- Authority
- JP
- Japan
- Prior art keywords
- oxides
- steel
- molten steel
- deoxidation
- oxide
- 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
Links
- 238000000034 method Methods 0.000 title claims description 15
- 238000009628 steelmaking Methods 0.000 title claims 2
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 37
- 239000010959 steel Substances 0.000 claims abstract description 37
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 12
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 8
- 239000001301 oxygen Substances 0.000 claims abstract description 8
- 229910000882 Ca alloy Inorganic materials 0.000 claims abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 3
- 238000007670 refining Methods 0.000 claims abstract description 3
- 238000002844 melting Methods 0.000 claims description 14
- 230000008018 melting Effects 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 229910000914 Mn alloy Inorganic materials 0.000 claims description 4
- 229910000676 Si alloy Inorganic materials 0.000 claims description 4
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 3
- 229910001093 Zr alloy Inorganic materials 0.000 claims description 3
- 238000009849 vacuum degassing Methods 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 13
- 229910052719 titanium Inorganic materials 0.000 abstract description 6
- 229910045601 alloy Inorganic materials 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 229910018643 Mn—Si Inorganic materials 0.000 abstract 1
- 230000001276 controlling effect Effects 0.000 abstract 1
- PMTRSEDNJGMXLN-UHFFFAOYSA-N titanium zirconium Chemical compound [Ti].[Zr] PMTRSEDNJGMXLN-UHFFFAOYSA-N 0.000 abstract 1
- 239000010936 titanium Substances 0.000 description 28
- 239000000047 product Substances 0.000 description 11
- 230000007423 decrease Effects 0.000 description 9
- 238000007711 solidification Methods 0.000 description 8
- 230000008023 solidification Effects 0.000 description 8
- 239000000203 mixture Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000012733 comparative method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 229910000532 Deoxidized steel Inorganic materials 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical group O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical group O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical group [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は脱酸材としてＭ合金をほとんど用いずに処理す
る製鋼工程での脱酸方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a deoxidizing method in a steel manufacturing process that uses almost no M alloy as a deoxidizing agent.
（従来の技術）
綱材の材質を向上させる方法として微小な脱酸生成物（
酸化物）を鋼材内に分散させてこれを変態、析出物の核
として利用する技術がある。この場合酸化物は微小であ
ることが必須で０．５〜５ｕＴｎ程度であることがのぞ
まれる。特に１０μｍ以上の大きな酸化物の生成は調材
材質、特に割れ感受性に悪影響を与えるために、その生
成を極力低減し、全体として微小な酸化物を多数分散さ
せる必要がある。(Prior art) As a method of improving the material quality of rope materials, minute deoxidation products (
There is a technology that disperses oxides in steel materials and uses them as nuclei for transformation and precipitates. In this case, it is essential that the oxide be minute, and preferably about 0.5 to 5 uTn. In particular, the formation of large oxides of 10 μm or more has a negative effect on the quality of the prepared material, especially on the cracking sensitivity, so it is necessary to reduce the formation as much as possible and to disperse a large number of small oxides as a whole.
この微小な酸化物を鋼材内に分散させる脱酸方法として
比較的脱酸力が弱いＴｉ脱酸が従来から行われているが
、Ｔｉ脱酸鋼の連続鋳造鋳片では下記の理由から鋳片の
厚み方向の中央部近傍（板厚の中心位置から表面へ板厚
の２５％程度の幅）で微小酸化物は減少している。すな
わち、Ｔｉ脱酸鋼では酸化物が凝固時に晶出成長するが
、冷却速度が遅く凝固時間が長い鋳片の厚み方向の中央
部では生成した酸化物が成長、凝集してその個数は減少
している。Ti deoxidation, which has a relatively weak deoxidizing power, has traditionally been used as a deoxidation method to disperse these minute oxides within steel materials. Micro oxides are reduced near the center in the thickness direction (a width of about 25% of the thickness from the center of the thickness to the surface). In other words, in Ti-deoxidized steel, oxides crystallize and grow during solidification, but in the center of the thickness of the slab where the cooling rate is slow and the solidification time is long, the generated oxides grow and aggregate, reducing their number. ing.
中央部での酸化物の個数を増加させるためには、凝固前
の溶鋼段階で微小な酸化物を生成し、凝固時の酸化物と
併せて全体の酸化物個数の増加を図る必要がある。従っ
て脱酸力が強く微小な酸化物を生成するＺｒの添加を組
み合わせたＴｉ十Ｚｒの複合脱酸が有効であり、特１！
ｌ６２−３１６１４２号（特開平１１５９３５６号公報
）に記載されている。In order to increase the number of oxides in the center, it is necessary to generate minute oxides in the molten steel stage before solidification, and to increase the total number of oxides together with the oxides during solidification. Therefore, composite deoxidation of Ti and Zr combined with the addition of Zr, which has strong deoxidizing power and produces minute oxides, is effective, and especially 1!
It is described in No. 162-316142 (Japanese Unexamined Patent Publication No. 1159356).
しかしながら、Ｔｉ＋Ｚｒ脱酸では、溶鋼段階で生成し
た酸化物は溶鋼内で衝突し時間の経過とともに合体凝集
し巨大な塊状あるいは群落状の酸化物、すなわち、クラ
スターを形成し溶鋼から浮上離脱しやすくなる。通常、
取鍋で脱酸材添加から鋳造凝固するまでには約２０分程
度の時間がかかり、酸化物がクラスター化し微小な酸化
物が減少するので、脱酸材添加から凝固まで時間が異な
る鋳片長さ方向で酸化物個数は減少し、クラスターは増
加し、その結果鋼材の材質が鋳造長さ方向で不均質なも
のとなっている可能性がある。However, in Ti+Zr deoxidation, the oxides generated during the molten steel collide within the molten steel, coalesce and agglomerate over time, forming huge lumps or clusters of oxides, or clusters, which tend to float away from the molten steel. . usually,
It takes about 20 minutes from adding deoxidizing agent to casting solidification in a ladle, and the oxides cluster and the minute oxides decrease, so the length of the slab varies from the time from adding deoxidizing agent to solidifying. In this direction, the number of oxides decreases and the number of clusters increases, and as a result, the material quality of the steel material may be non-uniform in the casting length direction.
（発明が解決しようとする課題）
本発明は上記クラスターの生成を抑制し、鋼材内に微小
な酸化物を多数分散させることを目的とした脱酸方法で
ある。(Problems to be Solved by the Invention) The present invention is a deoxidizing method aimed at suppressing the formation of the above-mentioned clusters and dispersing a large number of minute oxides in a steel material.
（課題を解決するための手段）
本発明は、Ｔｉ＋Ｚｒ脱酸で生成したクラスターの生成
を抑制するために、さらにＣａを添加して酸化物の融点
を下げ溶融状態とし、この低融点化によりクラスターを
生成することなく多数の微小な酸化物を均一に分布させ
ようとするもので、その要旨とするところは下記のとお
りである。(Means for Solving the Problems) In order to suppress the formation of clusters generated by Ti+Zr deoxidation, the present invention further adds Ca to lower the melting point of the oxide to a molten state, and by lowering the melting point, the clusters The aim is to uniformly distribute a large number of minute oxides without producing any oxides, and the gist is as follows.
（１）転炉から出鋼された取鍋固溶鋼に、第一脱酸材と
してＭｎ 、 Ｓｉ合金を投入し、その後第二脱酸材と
してＴｉ 、 Ｚｒ 、 Ｃａ合金を溶鋼中に投入して
酸素を５０ｐｐｍ以下として溶製し、その際鋼中成分の
重量濃度を以下に示す範囲に制御することを特徴とする
製鋼工程での脱酸方法。(1) Mn and Si alloys are added as first deoxidizers to the ladle solid solution steel tapped from the converter, and then Ti, Zr, and Ca alloys are added to the molten steel as second deoxidizers. A deoxidizing method in a steel manufacturing process, which comprises melting with oxygen at 50 ppm or less, and controlling the weight concentration of components in the steel within the range shown below.
Ｔｉ ： ０．００８〜０．０１８％
Ｚｒ ： ０．００５〜０．０１５％
Ｃａ ： ０．００１０−０．００４５％ｕ ： ｏ、
ｏｏｓ％以下
（２）転炉から出鋼された取鍋固溶鋼に、第一脱酸材と
してＭｎ 、 Ｓｉ合金を投入した後に真空脱ガス精錬
工程で溶鋼中の酸素を６０〜１５０ｐｐｍとし、その後
第二脱酸材としてＴｉ 、 Ｚｒ 、 Ｃａ合金を溶鋼
中に投入して酸素を５０ｐｐｍ以下として溶製し、その
際鋼中成分の重量濃度を以下に示す範囲に制御すること
を特徴とする製鋼工程での脱酸方法。Ti: 0.008-0.018% Zr: 0.005-0.015% Ca: 0.0010-0.0045% U: o,
oos% or less (2) After adding Mn and Si alloy as the first deoxidizing agent to the ladle solid solution steel tapped from the converter, the oxygen in the molten steel is reduced to 60 to 150 ppm in a vacuum degassing refining process, and then Steel manufacturing characterized by adding Ti, Zr, Ca alloy as a second deoxidizing material into molten steel to reduce oxygen to 50 ppm or less, and controlling the weight concentration of the components in the steel within the range shown below. Deoxidation method in process.
Ｔｉ ： ０．００８ 〜０．０１８ ％Ｚｒ ：
０．００５ 〜０．０１５ ％Ｃａ ： ０．００１
０〜０．００４５％Ａｌ ７０．００５％以下
以下、本発明の詳細な説明する。Ti: 0.008 to 0.018% Zr:
0.005 to 0.015%Ca: 0.001
0 to 0.0045% Al 70.005% or less The present invention will be described in detail below.
（作 用）
Ｔｉ＋Ｚｒ脱酸ではＺｒ添加後に生成した一次脱酸生成
物は、凝固までの時間内に酸化物同士が衝突すると、高
融点酸化物であるために球状化しにくく、塊状あるいは
群落状生成物、すなわち、クラスターを生成する。この
クラスターは酸化物と鉄の両者が混合したものである。(Function) In Ti + Zr deoxidation, if the oxides collide with each other during the time until solidification, the primary deoxidation products generated after Zr addition will not easily become spheroidal because they are high melting point oxides, and will form lumps or clusters. generate objects, i.e. clusters. This cluster is a mixture of both oxide and iron.
このクラスターの見かけの比重は鉄を含有しているため
球状酸化物より大きいが、見かけの大きさが大きいため
に全体としてクラスター化すると酸化物は浮上しやすい
。従って時間経過に伴って微小な酸化物の減少を抑制す
るためには、このクラスター生成を抑制することが必須
である。そのためには酸化物の融点を下げ、溶融段階で
酸化物自身が溶融していることが必要である。この方法
として、Ｃａ添加により酸化物の低融点化を図り、微小
な酸化物を均一分散させて、鋳造長さ方向の酸化物分布
を均一化するものである。The apparent specific gravity of this cluster is larger than that of the spherical oxide because it contains iron, but because of its large apparent size, the oxide tends to float when clustered as a whole. Therefore, in order to suppress the reduction of minute oxides over time, it is essential to suppress this cluster formation. For this purpose, it is necessary to lower the melting point of the oxide and to melt the oxide itself at the melting stage. This method involves lowering the melting point of the oxide by adding Ca, uniformly dispersing minute oxides, and making the oxide distribution uniform in the casting length direction.
Ｔｉ＋Ｚｒ脱酸とＴｔ＋Ｚｒ＋Ｃａ脱酸の微小な酸化物
とクラスター生成実績について第１図に示す。Ｔｉ＋Ｚ
ｒ 十Ｃａ脱酸では微小な脱酸生成物の個数が多く、か
つクラスターが観察されないことが分る。Figure 1 shows the results of minute oxide and cluster formation in Ti+Zr deoxidation and Tt+Zr+Ca deoxidation. Ti+Z
It can be seen that in the r10Ca deoxidation, the number of minute deoxidation products is large and no clusters are observed.
Ｔｉ＋Ｚｒ＋Ｃａ脱酸による酸化物個数増加について実
験結果を調査解析すると、基本的には、Ｔｉは凝固時の
酸化物の晶出、Ｚｒは脱酸材添加時の微小な酸化物の生
成（−成膜酸生成物） 、Ｃａは脱酸力が強く、酸化物
の形態制御によりクラスター化を抑制することが判明し
た。When examining and analyzing the experimental results regarding the increase in the number of oxides due to Ti+Zr+Ca deoxidation, we find that Ti is basically caused by the crystallization of oxides during solidification, and Zr is caused by the formation of minute oxides (-film formation) when the deoxidizer is added. It was found that Ca has a strong deoxidizing power and that clustering can be suppressed by controlling the form of oxides.
Ｔｉ、 Ｚｒ、 Ｃａ、 ＡＩの成分範囲について第２
図（ａ）〜（ｄ）を用いて説明する。Regarding the component ranges of Ti, Zr, Ca, and AI,
This will be explained using Figures (a) to (d).
Ｔｉ＜０．００８％では凝固時に晶出する酸化物の生成
能力が小さく、酸化物の個数が全体に低い。When Ti<0.008%, the ability to generate oxides that crystallize during solidification is small, and the number of oxides is low overall.
方Ｔｉ＞０．０１８％では酸化物中のチタン酸化物の組
成が高く高融点化し、その酸化物はクラスター化し微小
な酸化物は減少する（第２図（ａ））。On the other hand, when Ti>0.018%, the composition of titanium oxide in the oxide becomes high and the melting point increases, the oxide becomes clustered, and the number of minute oxides decreases (FIG. 2(a)).
Ｃａ＜０．００１０％ではＴｉとＺｒの脱酸生成物の低
融点化が困難でクラスター発生を抑止できない。また、
Ｃａ＞０．００４５％ではクラスター化を抑制し球状化
生成物となるが、充分低融点化したため脱酸生成物同士
の凝集合体が容易であり、その結果脱酸生成物の粗大化
が進行し、割れの主要な要因となる１０ｎ以上の大きな
酸化物の生成が増加し、材質上悪影響を与える（第２図
（ｂ））。When Ca<0.0010%, it is difficult to lower the melting point of the deoxidized product of Ti and Zr, and cluster generation cannot be suppressed. Also,
When Ca>0.0045%, clustering is suppressed and a spheroidized product is formed, but since the melting point is sufficiently low, the deoxidized products easily aggregate and coalesce, and as a result, the deoxidized products become coarser. , the formation of large oxides of 10n or more, which are the main cause of cracks, increases, which has an adverse effect on the material quality (Fig. 2(b)).
Ｚｒ ＜ ０ 、００５％では脱酸付添加に伴なう一次
脱酸生成物の生成が少なく、酸化物の個数が全体に少な
い。一方、Ｚｒ＞０．０１５％では脱酸生成物中のジル
コニウム酸化物の組成が高く高融点化し、その酸化物は
クラスター化し、微小な酸化物は減少する（第２図（Ｃ
））。When Zr<0,005%, the production of primary deoxidation products accompanying deoxidation addition is small, and the number of oxides is small overall. On the other hand, when Zr>0.015%, the composition of the zirconium oxide in the deoxidized product becomes high and the melting point increases, the oxide clusters, and the number of minute oxides decreases (Figure 2 (C
)).
ＡＩ＞０．００５％では脱酸生成物中のアルミニウム酸
化物の組成が高く高融点化し、そのため酸化物はクラス
ター化し、微小な酸化物は減少する（第２図（ｄ））。When AI>0.005%, the composition of aluminum oxide in the deoxidized product becomes high and the melting point increases, so that the oxide clusters and the number of fine oxides decreases (FIG. 2(d)).
従って、脱酸生成物をクラスター化することなく微小な
酸化物を多数分散させるには溶鋼成分を下記の範囲に制
御することが有効である。Therefore, in order to disperse a large number of fine oxides without clustering the deoxidized products, it is effective to control the molten steel components within the following range.
Ｔｉ ： ０．００８〜０．０１８％
Ｚｒ ： ０．００５ 〜０．０１５ ％Ｃａ ：
０．００１０〜０．００４５％Ａ７ ： ０．００５％
以下
なお、成分コントロール、材質のバラツキ等を考慮する
と、Ｔｉ ： ０．０１０〜０．０１５％、Ｚｒ ：
０．００５〜０．０１５％、Ｃａ ： ０．００１５〜
０．００４０％、Ａ１： ０．００５％以下とすること
が望ましい。Ti: 0.008-0.018% Zr: 0.005-0.015% Ca:
0.0010-0.0045% A7: 0.005%
In addition, considering component control, material variations, etc., Ti: 0.010 to 0.015%, Zr:
0.005~0.015%, Ca: 0.0015~
0.0040%, A1: Desirably 0.005% or less.
（実施例）
第１表に本発明法及び比較法における溶鋼成分、脱酸元
素の種類、製造された鋳片の鋳片厚み方向の中央部の酸
化物個数と粒径側の酸化物分布、平均酸化物粒径、クラ
スター生成の有無を示す。ここで、製造方法１〜１１は
比較方法であり、１２〜１４が本発明方法である。比較
方法のうち１はＴｉ単独脱酸、２．３はＴｉ＋Ｚｒ脱酸
、４はＴｉ＋Ｃａ脱酸で、５〜１１は脱酸元素の溶鋼中
濃度が本発明範囲外にある。(Example) Table 1 shows the composition of molten steel in the present invention method and the comparative method, the type of deoxidizing element, the number of oxides in the center of the manufactured slab in the thickness direction of the slab, and the oxide distribution on the grain size side. Indicates the average oxide particle size and the presence or absence of cluster formation. Here, manufacturing methods 1 to 11 are comparative methods, and manufacturing methods 12 to 14 are methods of the present invention. Among the comparative methods, 1 is Ti deoxidation alone, 2.3 is Ti+Zr deoxidation, 4 is Ti+Ca deoxidation, and in 5 to 11, the concentration of the deoxidizing element in the molten steel is outside the range of the present invention.
第１表から明らかなように、１．２では酸化物個数が少
なく、３では酸化物個数は多いもののクラスターが発生
している。４では酸化物個数が少なく、かつ粒径が大き
くなっている。Ｔｉ＋Ｚｒ十Ｃａ脱酸の本発明範囲外の
５〜１１の結果は次のとおりである。Ｚｒの上限超では
酸化物はクラスター化し、微小な酸化物は減少しており
、Ｚｒの下限未満では酸化物の個数が全体に少なくなっ
ている。Ｃａの上限超ではクラスター化を抑制し、球状
化酸化物となるが、十分低融点化したため酸化物同士の
凝集合体が容易となり、酸化物が粗大化している。Ｔｉ
の上限超では酸化物はクラスクー化し、微小な酸化物は
減少している。Ｔｉの下限未満では酸化物の個数が全体
に少ない。Ｍの上限超では酸化物はクラスター化し、微
小な酸化物は減少している。As is clear from Table 1, in case 1.2, the number of oxides is small, and in case 3, although the number of oxides is large, clusters are generated. In No. 4, the number of oxides is small and the particle size is large. The results of 5 to 11 outside the scope of the present invention for Ti+Zr+Ca deoxidation are as follows. When the Zr content exceeds the upper limit, the oxides cluster and the number of minute oxides decreases, and when the Zr content exceeds the lower limit, the number of oxides decreases overall. If the Ca content exceeds the upper limit, clustering is suppressed and a spheroidized oxide is formed, but since the melting point is sufficiently low, the oxides easily aggregate and coalesce, and the oxide becomes coarse. Ti
Above the upper limit of , the oxides become clascous and the number of minute oxides decreases. Below the lower limit of Ti, the number of oxides is small overall. When M exceeds the upper limit, oxides cluster and the number of minute oxides decreases.
一方、本発明範囲内の？５ｔｌｆｆｉ中濃度のＴｉ ＋
Ｚｒ ＋ Ｃａ脱酸では粒径が３１程度と微細で多数
の酸化物が、クラスターを発生させることなく、鋳片内
に分布している。On the other hand, what is within the scope of the present invention? 5tlffi medium concentration of Ti +
In Zr + Ca deoxidation, a large number of fine oxides with a particle size of about 31 mm are distributed within the slab without generating clusters.
（発明の効果）
本発明によれば、材質上有害となるクラスターを生成す
ることなく、鋳片内に微小な酸化物を多数分散させるこ
とが可能であるから、本発明は産業上きわめて有用であ
る。(Effects of the Invention) According to the present invention, it is possible to disperse a large number of minute oxides in a slab without producing clusters that are harmful to the material, so the present invention is extremely useful industrially. be.
第１図はＴｉ＋Ｚｒ脱酸の場合とＴｉ十Ｚｒ十Ｃａ脱酸
の場合の微小酸化物とクラスターの生成実績を比較して
示す図、第２図（ａ）〜（６）は溶鋼中のＴｉ、 Ｃａ
、 Ｚｒ。
Ａｌ濃度と酸化物生成個数、酸化物平均粒径及びクラス
ター生成個数の関係を示す図である。Figure 1 is a diagram comparing the formation of micro oxides and clusters in the case of Ti + Zr deoxidation and in the case of Ti + Zr + Ca deoxidation. , Ca
, Zr. FIG. 2 is a diagram showing the relationship between Al concentration, the number of oxides produced, the average particle size of oxides, and the number of clusters produced.
Claims (2)
してＭｎ、Ｓｉ合金を投入し、その後第二脱酸材として
Ｔｉ、Ｚｒ、Ｃａ合金を溶鋼中に投入して酸素を５０ｐ
ｐｍ以下として溶製し、その際鋼中成分の重量濃度を以
下に示す範囲に制御することを特徴とする製鋼工程での
脱酸方法。 Ｔｉ：０．００８〜０．０１８％ Ｚｒ：０．００５〜０．０１５％ Ｃａ：０．００１０〜０．００４５％ Ｎ：０．００５％以下(1) Mn and Si alloys are added as the first deoxidizer to the molten steel in the ladle tapped from the converter, and then Ti, Zr and Ca alloys are added as the second deoxidizer to the molten steel. 50p of oxygen
1. A deoxidizing method in a steel manufacturing process, characterized in that the steel is melted to a temperature of pm or less, and the weight concentration of components in the steel is controlled within the range shown below. Ti: 0.008-0.018% Zr: 0.005-0.015% Ca: 0.0010-0.0045% N: 0.005% or less
してＭｎ、Ｓｉ合金を投入した後に真空脱ガス精錬工程
で溶鋼中の酸素を６０〜１５０ｐｐｍとし、その後第二
脱酸材としてＴｉ、Ｚｒ、Ｃａ合金を溶鋼中に投入して
酸素を５０ｐｐｍ以下として溶製し、その際鋼中成分の
重量濃度を以下に示す範囲に制御することを特徴とする
製鋼工程での脱酸方法。 Ｔｉ：０．００８〜０．０１８％ Ｚｒ：０．００５〜０．０１５％ Ｃａ：０．００１０〜０．００４５％ Ａｌ：０．００５％以下(2) After adding Mn and Si alloys as the first deoxidizer to the molten steel in the ladle tapped from the converter, the oxygen in the molten steel is reduced to 60 to 150 ppm in the vacuum degassing refining process, and then the second deoxidation A steelmaking process characterized by adding Ti, Zr, and Ca alloys as acid materials into molten steel and melting with oxygen at 50 ppm or less, and controlling the weight concentration of the components in the steel within the range shown below. Deoxidation method. Ti: 0.008-0.018% Zr: 0.005-0.015% Ca: 0.0010-0.0045% Al: 0.005% or less
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6865590A JPH03267311A (en) | 1990-03-19 | 1990-03-19 | Deoxidizing method in steel making stage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6865590A JPH03267311A (en) | 1990-03-19 | 1990-03-19 | Deoxidizing method in steel making stage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03267311A true JPH03267311A (en) | 1991-11-28 |
Family
ID=13379934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6865590A Pending JPH03267311A (en) | 1990-03-19 | 1990-03-19 | Deoxidizing method in steel making stage |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03267311A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010280953A (en) * | 2009-06-04 | 2010-12-16 | Sumitomo Metal Ind Ltd | Method for restraining nozzle-blockade of zr-added steel and method for manufacturing minute-oxide dispersing steel |
-
1990
- 1990-03-19 JP JP6865590A patent/JPH03267311A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010280953A (en) * | 2009-06-04 | 2010-12-16 | Sumitomo Metal Ind Ltd | Method for restraining nozzle-blockade of zr-added steel and method for manufacturing minute-oxide dispersing steel |
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