JPS62199749A - Method for continuously casting ca-s free-cutting steel - Google Patents
Method for continuously casting ca-s free-cutting steelInfo
- Publication number
- JPS62199749A JPS62199749A JP3937786A JP3937786A JPS62199749A JP S62199749 A JPS62199749 A JP S62199749A JP 3937786 A JP3937786 A JP 3937786A JP 3937786 A JP3937786 A JP 3937786A JP S62199749 A JPS62199749 A JP S62199749A
- Authority
- JP
- Japan
- Prior art keywords
- free
- cutting steel
- steel
- continuous casting
- weight
- 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
- 229910000915 Free machining steel Inorganic materials 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims description 7
- 238000005266 casting Methods 0.000 title abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 20
- 239000010959 steel Substances 0.000 claims abstract description 20
- 238000009749 continuous casting Methods 0.000 claims abstract description 18
- 238000007654 immersion Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 229910018523 Al—S Inorganic materials 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000002844 melting Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 230000008018 melting Effects 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は、Ｃａ−３系快削鋼を連続鋳造法により溶製
する際、タンディシュと鋳型との間に設けた浸漬ノズル
の詰りかなく円滑に鋳造し得る方法に関する。[Detailed Description of the Invention] Industrial Field of Application This invention provides a method for smoothly melting Ca-3 free-cutting steel by continuous casting without clogging the immersion nozzle provided between the tundish and the mold. This invention relates to a method for casting.
従来の技術
Ｃａ快削鋼はＳ快削鋼ヤｐｂ快削鋼とは異なり、鋼中の
酸化物（Ｃ’ａＯ、Ｓｉｎ、、、／Ｖ２Ｏ３の複合酸化
物）を快削性に適したものに変化さけたものである。Conventional technology Ca free-cutting steel differs from S free-cutting steel and Pb free-cutting steel in that the oxides in the steel (composite oxides of C'aO, Sin, , /V2O3) are suitable for free-cutting properties. This is something that has changed.
そのため、被剛性改善の機構−管鋼質に及ぼす効果が他
の快削鋼とは異なり、ＣａとＳを複合添加することによ
り性能の優れた快削鋼を作り出すことができる。又、強
度が基本鋼と全く同等のものが得られるため合金鋼等に
適している。そのため、優れた被剛性を要求される自動
車部品用合金鋼等においてはＣａ−３系快削鋼がよく用
いられている。Therefore, the effect on the mechanism of rigidity improvement and the quality of the pipe steel is different from that of other free-cutting steels, and by adding Ca and S in combination, it is possible to create a free-cutting steel with excellent performance. In addition, it is suitable for alloy steels, etc., since it can provide strength exactly equivalent to that of basic steel. Therefore, Ca-3 free-cutting steel is often used in alloy steels for automobile parts that require excellent rigidity.
このＣａ−３系快削鋼はＣａ−３，Ｃａ−０等のＣａ系
介在物により被削性の向上が図られている。The machinability of this Ca-3 free-cutting steel is improved by Ca-based inclusions such as Ca-3 and Ca-0.
発明が解決しようとする問題点
ところが、このＣａ−５系快削鋼はＣａ−Ａ＆−３系の
高融点介在物を晶出するため、これを連続鋳造法で製造
すると、連続鋳造設備のタンディシュと鋳型との間に設
けた浸漬ノズルにノズル詰りか発生し、操業を中止せざ
るを得ない事態等が起り生産性が低下するため、連続鋳
造法による快削鋼の溶製を困難にしていた。そのため、
Ｃａ−３系快削鋼は鋳塊法により製造せざるを得す、製
造コストの低減を図ることができなかった。Problems to be Solved by the Invention However, since this Ca-5-based free-cutting steel crystallizes Ca-A&-3-based high-melting inclusions, if it is manufactured by continuous casting, the tundish of continuous casting equipment This makes it difficult to produce free-cutting steel using the continuous casting method because the immersion nozzle installed between the mold and the mold can become clogged, forcing the operation to be stopped and reducing productivity. Ta. Therefore,
Ca-3 free-cutting steel has to be manufactured by the ingot method, and it has not been possible to reduce manufacturing costs.
この発明は、かかる現状にかんがみ、浸漬ノズルにノズ
ル詰りが発生しないＣａ−３系快削鋼の連続鋳造法を提
供するものであり、浸漬ノズル詰りの原因となるＣａ−
Ａ（１−３系高融点介在物の晶出を防止するには、ｇｉ
Ｍ量を減してＣａ−３系低融点介在物に変えればよいと
いう知見に基いてなされたものでおる。In view of the current situation, the present invention provides a continuous casting method for Ca-3 free-cutting steel that does not cause nozzle clogging in the immersion nozzle.
A (To prevent crystallization of 1-3 high melting point inclusions, gi
This was done based on the knowledge that it is sufficient to reduce the amount of M and replace it with Ca-3 type low melting point inclusions.
問題点を解決するための手段
゛ この発明は、Ｃａ Ｏ，０１０ｆｉｆｆｉ％
以上、Ｓｏ、０２０重量％以上を含有するＣａ−３系快
削鋼の連続鋳造において、溶鋼の＝ＩＩＭ量を０．０１
０重量％以下に保って連続鋳造することにある。Means for solving the problem ゛ This invention is based on CaO,010fiffi%
As described above, in continuous casting of Ca-3 free-cutting steel containing 020% by weight or more of So, the =IIM amount of molten steel is 0.01
The goal is to continuously cast the metal while keeping it below 0% by weight.
この発明において使用するＣａ−３系快削鋼は基本成分
の含有量及び合金元素の含有量は特別に限定する必要は
ないが、快削性を付与するためＣａ、Ｓ及びｇｉＮにつ
いては次のように限定する。The content of basic components and the content of alloying elements in the Ca-3 free-cutting steel used in this invention do not need to be particularly limited, but in order to impart free-cutting properties, Ca, S, and giN are as follows: be limited as follows.
Ｃａは、優れた被剛性を得るため０．０１０重量％以上
の含有が必要であるが、１．０重量％を超えて多くを添
加しても被削性の向上は飽和し、文通の性質に悪影響を
与えるから上限を１．Ｏｉｉ％以下とすることが望まし
い。Ca needs to be contained in an amount of 0.010% by weight or more in order to obtain excellent rigidity, but even if more than 1.0% by weight is added, the improvement in machinability is saturated and the properties of correspondence The upper limit is set to 1. It is desirable to set it to Oii% or less.
Ｓは、Ｃａと相乗して被削性の向上に有効であるが、そ
の効果を得るには０．０２０重量％以上の含有が必要で
ある。しかし、０．５０重量％を超えると鋼の性質に悪
影響を与えるから０．５０重量％以下が望ましい。S is effective in improving machinability in synergy with Ca, but it needs to be contained in an amount of 0.020% by weight or more to obtain this effect. However, if it exceeds 0.50% by weight, it will adversely affect the properties of the steel, so it is preferably 0.50% by weight or less.
＝ＡＭは、第３図に示すように、０．０１０重四％を超
えて多く含有すると、Ｃａ−／Ｖ−３系高融点介在物が
浸漬ノズル内で晶出してノズル詰まりの原因となるから
、ｏ、 ｏｉｏ重量％以下に限定する。=As shown in Figure 3, if AM is contained in a large amount exceeding 0.010% by weight, Ca-/V-3-based high melting point inclusions will crystallize in the immersion nozzle, causing nozzle clogging. Therefore, o, oio is limited to less than % by weight.
作用
このように、溶鋼のｉＭ量をｏ、ｏｉｏ重量％以下に保
つことにより、第３図に示すように、ＣａＳの活量を低
下させることができる。その結果、タンディシュから浸
漬ノズルを経て鋳型に流下する溶鋼の流動性が確保され
ノズル詰まりを起すことがない。Effect: By keeping the iM content of molten steel below o, oio weight percent, the activity of CaS can be reduced as shown in FIG. 3. As a result, the fluidity of the molten steel flowing down from the tundish to the mold through the immersion nozzle is ensured, and nozzle clogging does not occur.
発明の効果
この発明は、Ｃａ−３系快削鋼を連続鋳造する際、溶鋼
のＳｆ］１ｌＡ１１Ｊｔ−を０．０１０重量％以下に保
つことにより、高融点介在物の晶出を阻止して浸漬ノズ
ルのノズル詰まりを防止できる。そのため、ノズル詰ま
りによる操業の中止が皆無となり、操業効率の向上によ
り生産コストの低減を図ることができる。Effects of the Invention This invention prevents the crystallization of high-melting point inclusions by keeping the Sf]1lA11Jt- of the molten steel at 0.010% by weight or less when continuously casting Ca-3 free-cutting steel. Prevents nozzle clogging. Therefore, there is no need to stop operations due to nozzle clogging, and production costs can be reduced by improving operational efficiency.
実施例 この発明の実施例について説明する。Example Examples of this invention will be described.
実施例１
第１表に示す成分範囲のＣａ−３系快削鋼を使って、各
種成分のスラブを湾曲型連続鋳造機にて溶製した。Example 1 Using Ca-3 free-cutting steel having the composition range shown in Table 1, slabs with various compositions were cast using a curved continuous casting machine.
そして、各種成分の溶鋼を鋳造する際の浸漬ノズルの詰
まりを調べた。その結果をＣａ／Ｓと鍔Ａｇとの関係で
まとめて第１図に示す。Then, clogging of the immersion nozzle during casting of molten steel of various components was investigated. The results are summarized in FIG. 1 in terms of the relationship between Ca/S and collar Ag.
図中にノズル詰まり発生領域として示すように、Ｃａ／
Ｓが比較的に小さり！ＩＩＩＩＭが多い範囲においてノ
ズル詰まりが発生し、ｇｉＭを０．０１０ｉ量％以下に
すればＣａ／Ｓの広い範囲においてノズル詰まりが発生
しないことがわかる。As shown in the figure as the nozzle clogging area, Ca/
S is relatively small! It can be seen that nozzle clogging occurs in a range where IIIM is large, and nozzle clogging does not occur in a wide range of Ca/S when giM is set to 0.010i amount % or less.
実施例２
第２表に示す、この発明の実施によるｉｌＭＡについて
被剛性を試験した。なお、この際比較のため、連続鋳造
法で溶製された従来のＣａ−３系快削鋼からなる鋼Ｂ及
び通常の連続鋳造材からなるｗＩＣをも試験した。Example 2 The ilMAs according to the practice of this invention shown in Table 2 were tested for stiffness. At this time, for comparison, Steel B, which is made of a conventional Ca-3 free-cutting steel produced by continuous casting, and wIC, which is made of a normal continuous cast material, were also tested.
その被削性試験は、１０＃の孔を穿孔したときのドリル
回転数を変え、ドリルが破損するまでのドリル寿命で測
定した。その結果を第２図に示す。The machinability test was performed by changing the number of rotations of the drill when drilling a 10# hole, and measuring the life of the drill until it broke. The results are shown in FIG.
この結果より、この発明の実施による快削鋼の被削性は
従来法による快削鋼である鋼Ｂと変わりないことがわか
る。From this result, it can be seen that the machinability of the free-cutting steel produced by implementing the present invention is the same as that of Steel B, which is free-cutting steel produced by the conventional method.
（以下余白）
第２表
ただし、ＩＩＩＩＡはこの発明の実施による鋼、鋼Ｂは
従来の連続鋳造による快削鋼、
ｍｃは通常の連続鋳造鋼、
実施例３
Ｇ Ｏ，５０重ｆｆｉ％、Ｓｉ Ｏ，２０重量％、）ｆ
ｎｌ、０重量％、Ｃａ Ｏ，００３重量％、５Ｏ１０２
５重量％を含有する鋼の＝ＸｉＡ＆量を種々変化させ、
介在物融点の変化を試験した。その結果をＣａＳの活量
と介在物融点との関係で第３図に示した。この結果より
ｉＮを低減すればＣａＳの活量が低下し、ＣａＳが溶け
やすくなり融点が降下することがわかる。(Leaving space below) Table 2 However, IIIA is steel according to the present invention, steel B is free-cutting steel made by conventional continuous casting, mc is ordinary continuous casting steel, Example 3 G O, 50 wt ffi%, Si O, 20% by weight, )f
nl, 0% by weight, Ca O, 003% by weight, 5O102
Varying the amount of =XiA& of steel containing 5% by weight,
The change in inclusion melting point was tested. The results are shown in FIG. 3 as a relationship between CaS activity and inclusion melting point. This result shows that if iN is reduced, the activity of CaS decreases, CaS becomes more soluble, and the melting point decreases.
第１図はＣａ／Ｓと面Ｎとの関係において浸漬ノズル詰
まり発生領域を示すグラフ、第２図はこの発明の実施に
よるＣａ−３系快削鋼からなる１ＩｌｉＡと従来の連続
鋳造によるＣａ−３系快削鋼からなる鋼Ｂ及び通常の連
続鋳造材からなる１ｌｌＣのドリル回転数とドリル穿孔
数との関係によりドリル寿命を示すグラフ、第３図はＣ
ａ−３系快削鋼のｄＭｆｆｉを変化させた場合のＣａＳ
の活量と介在物融点との関係を示すグラフである。FIG. 1 is a graph showing the area where immersion nozzle clogging occurs in the relationship between Ca/S and surface N. FIG. 2 is a graph showing 1IliA made of Ca-3 free cutting steel according to the present invention and Ca- A graph showing the drill life according to the relationship between the drill rotation speed and the number of drill holes for Steel B made of 3 series free-cutting steel and 1llC made of ordinary continuous casting material, Figure 3 is C.
CaS when changing dMffi of a-3 series free-cutting steel
2 is a graph showing the relationship between the activity of and the melting point of inclusions.
Claims (1)
含有するＣａ−Ｓ系快削鋼の連続鋳造において、溶鋼中
のｓｏｌＡｌ量を０．０１０重量％以下に制限して連続
鋳造することを特徴とするＣａ−Ｓ系快削鋼の連続鋳造
法。Continuous casting of Ca-S free-cutting steel containing 0.010% by weight or more of Ca and 0.020% by weight or more of S is characterized by continuous casting by limiting the amount of solAl in the molten steel to 0.010% by weight or less. A continuous casting method for Ca-S free-cutting steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3937786A JPS62199749A (en) | 1986-02-25 | 1986-02-25 | Method for continuously casting ca-s free-cutting steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3937786A JPS62199749A (en) | 1986-02-25 | 1986-02-25 | Method for continuously casting ca-s free-cutting steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62199749A true JPS62199749A (en) | 1987-09-03 |
Family
ID=12551334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3937786A Pending JPS62199749A (en) | 1986-02-25 | 1986-02-25 | Method for continuously casting ca-s free-cutting steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62199749A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100605712B1 (en) * | 2001-12-22 | 2006-08-01 | 주식회사 포스코 | Method for Reducing Nozzle Clogging for Molten Steel Containing Al and S |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55141550A (en) * | 1979-04-19 | 1980-11-05 | Daido Steel Co Ltd | Structural steel with low anisotropy of mechanical properties and superior machinability, and its manufacture by continuous casting |
-
1986
- 1986-02-25 JP JP3937786A patent/JPS62199749A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55141550A (en) * | 1979-04-19 | 1980-11-05 | Daido Steel Co Ltd | Structural steel with low anisotropy of mechanical properties and superior machinability, and its manufacture by continuous casting |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100605712B1 (en) * | 2001-12-22 | 2006-08-01 | 주식회사 포스코 | Method for Reducing Nozzle Clogging for Molten Steel Containing Al and S |
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