JPS62149843A - Production of lead free cutting steel - Google Patents
Production of lead free cutting steelInfo
- Publication number
- JPS62149843A JPS62149843A JP29002485A JP29002485A JPS62149843A JP S62149843 A JPS62149843 A JP S62149843A JP 29002485 A JP29002485 A JP 29002485A JP 29002485 A JP29002485 A JP 29002485A JP S62149843 A JPS62149843 A JP S62149843A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- steel
- lead free
- particles
- cutting 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
Links
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は給快削鋼の製造方法に係り、特にＰｂを均一に
添加できる製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of producing free-cutting steel, and particularly to a method of producing free-cutting steel that can uniformly add Pb.
Ｐｂを鋼に添加することにより、機械加工性が著しく向
上すること（よ良（知られている。しかしながら、Ｐｂ
を溶鋼へ均一に添加することは、Ｐｂの溶鋼への溶解度
が小さいために、溶鋼温度を著しく高くし、かつ外力に
よる溶鋼の撹拌等が必要である。このため製鋼プロセス
において、大きな外力を付加しうる取鍋中の溶鋼へ添加
するか、あるいは造塊の上注ぎもしくは下注ぎ注入流中
に約０５〜１ ｍｍ程度の球状体ＰｂＱ添加し、溶鋼自
体が持つ撹拌エネルギーを利用する方法が行われている
。しかしながら溶鋼温度の微小な変動あるいは注入流速
の変動等でＰｂ添加歩留、Ｐｂ粒の分散度、巨視的Ｐｂ
粒の発生等々の問題を生じている。It is known that the addition of Pb to steel significantly improves machinability.
To uniformly add Pb to molten steel, the solubility of Pb in molten steel is low, so it is necessary to raise the molten steel temperature significantly and to stir the molten steel by external force. For this reason, in the steelmaking process, PbQ is added to the molten steel in a ladle to which a large external force can be applied, or spherical bodies of about 0.5 to 1 mm are added to the top or bottom pouring stream of the ingot, and the molten steel itself is A method is being used that utilizes the stirring energy possessed by However, due to minute fluctuations in molten steel temperature or fluctuations in injection flow rate, the Pb addition yield, the dispersion of Pb grains, and the macroscopic Pb
This causes problems such as the generation of grains.
一方、連続鋳造材へのＰｂの添加は、前記取鍋中での添
加のほかは、タンディツシュあるいは鋳型の溶鋼への添
加は外力付加が困難であり大きな外力は与えろことがで
きず、一方大きな外力を付加すればタンディツシュフラ
ックスあるいはモールドフラックスの溶鋼への巻き込み
等により溶鋼ｌ４浄性が低下し、更にＰｂの溶解に必要
な時間が不足する等の理由のため、従来タンディツシュ
あるいは鋳型てＰｂあるいはＰｂ合金を球状の粒子もし
くは線状体て添加ずろことは工業的に行われていない。On the other hand, when adding Pb to continuously cast materials, other than adding it in the ladle, it is difficult to add external force to the molten steel in the tundish or mold, and it is impossible to apply a large external force. Adding tundish flux or mold flux to the molten steel will reduce the purity of the molten steel, and furthermore, the time required to melt Pb will be insufficient. Adding alloys in the form of spherical particles or linear bodies has not been done industrially.
連続鋳造時のこれらの問題を解決するため特開昭５７−
１６８７５５においては鋳型的溶鋼を電磁撹拌し、鋳型
的溶鋼にＰｂまたはＰｂ合金から成る線を直接添加し連
続鋳造する方法が開示されているが、十分な撹拌エネル
ギーを与えることができずＰｂの均一分散、あるいは均
一なＰｂ粒の分布ができず、更に未溶解のＰｂが存在し
ている等の問題点がある。In order to solve these problems during continuous casting, JP-A-57-
No. 168755 discloses a method of continuous casting by electromagnetically stirring mold-like molten steel and directly adding wire made of Pb or Pb alloy to the mold-like molten steel. There are problems such as dispersion or uniform distribution of Pb particles and the presence of undissolved Pb.
〔発明が解決しようとする問題点〕
本発明の目的は、上記従来技術の問題点を解決し、溶鋼
温度あるいは造塊注入流速の変動の影響を緩和し大きな
外力もしくは溶鋼流エネルギーが付加できない場合、ま
たは十分なＰｂ溶解時間の得られない連続鋳造用の鋳型
の場合でもＰｂ粒の不均一分散、巨大Ｐｂ粒の生成、未
溶解Ｐｂの存在を防止できる鉛快削泪の製造方法を提供
するにある。[Problems to be Solved by the Invention] The purpose of the present invention is to solve the above-mentioned problems of the prior art, to alleviate the effects of fluctuations in molten steel temperature or ingot injection flow rate, and to solve the problem when large external force or molten steel flow energy cannot be applied. To provide a method for manufacturing a lead free-cutting hole that can prevent uneven dispersion of Pb grains, generation of giant Pb grains, and presence of undissolved Pb even in the case of continuous casting molds in which sufficient Pb melting time cannot be obtained. It is in.
〔問題点を解決するための手段および作用〕本発明の要
旨とするところは次の如くである。[Means and operations for solving the problems] The gist of the present invention is as follows.
すなわち、重量比でＰｂ：０．０３〜０４％の組成から
成る鉛快削鋼の製造方法において、溶鋼内における反応
性が強い物質粒を第２相粒として混合したＰｂもしくは
Ｐｂ合金から成る複合粒体を前記ｉ８鋼に添加すること
を特徴とする鉛快削鋼の製造方？去である。That is, in a method for producing lead free-cutting steel having a composition of Pb: 0.03 to 04% by weight, a composite consisting of Pb or a Pb alloy mixed with particles of highly reactive substances in molten steel as second phase particles is used. A method for producing lead free-cutting steel characterized by adding granules to the i8 steel. It's gone.
本発明における鉛快削鋼のＰｂ含有量は００３％未満で
あれば被削性の向上が認められず、一方０４％を越える
とｉｇ的性質が劣化し地底発生等の問題を生じるので０
．０３〜０４％の範囲に限定した。If the Pb content of the lead free-cutting steel in the present invention is less than 0.03%, no improvement in machinability will be recognized, while if it exceeds 0.4%, the ig properties will deteriorate and problems such as underground formation will occur.
．． It was limited to a range of 0.03% to 0.04%.
第２相粒の物質粒としてはｉ８鋼内において脱酸、脱硫
反応性の強いＣａ、（、ａ合金、Ｍｇ、Ｍｇ合金ＡＢａ
、Ｂａ合金、希土類金属、Ｎａ、Ｎａ合金等をＰｂまた
はＰｂ合金に均一に混入させる。これらの第２相粒を混
在させたＰｂあるいはＰｂ合金から成る複合粒体は溶鋼
に添加されると、第２相粒の溶鋼との反応エネルギーあ
るいは蒸発エネルギーによってＰｂの溶鋼への分散を促
進する。The material grains of the second phase grains include Ca, (, a alloy, Mg, Mg alloy ABa, which has strong deoxidation and desulfurization reactivity in i8 steel.
, Ba alloy, rare earth metal, Na, Na alloy, etc. are uniformly mixed into Pb or Pb alloy. When composite grains made of Pb or Pb alloy mixed with these second phase grains are added to molten steel, they promote the dispersion of Pb into the molten steel by reaction energy or evaporation energy of the second phase grains with the molten steel. .
これらの第２相粒の物質粒の最大大きさは複合粒体の大
きさに依存する。複合粒体の大きさが２ｍｍの時、第２
相粒は０１〜０２闘が溶鋼中のＰｂ分散、Ｐｂ添加量か
らみて好ましいが０．８ｍｍでも効果に大きな差がない
。The maximum size of these second phase grains depends on the size of the composite grains. When the size of the composite particles is 2 mm, the second
Although phase grains of 01 to 02 mm are preferable in terms of Pb dispersion in molten steel and the amount of Pb added, there is no significant difference in effect even if the phase grains are 0.8 mm.
複き粒体の大きさは、気送用パイプを使用して溶鋼に添
加する場合は、気送による搬送性の点から径０．２ｍｍ
未満では目詰りあるいは気送圧の高圧化等の問題があり
、気送圧を過度に高圧とすれば添加量のコンＩ・ロール
が困難になり、また溶鋼を過度に撹乱するので下限は０
、２ ＋ｎｍとした。一方、５１ｎＩｎを越えると溶
鋼中における溶解時間が長（なり未溶解Ｐｂによる地底
が発生するので上限を５ｆｆｌｎＩとした。When adding to molten steel using a pneumatic pipe, the size of the composite grains should be 0.2 mm in terms of transportability by pneumatic transport.
If it is less than 0, there will be problems such as clogging or high pneumatic pressure, and if the pneumatic pressure is too high, it will be difficult to control and roll the addition amount, and the molten steel will be disturbed excessively, so the lower limit is 0.
, 2 + nm. On the other hand, if it exceeds 51 nIn, the dissolution time in molten steel becomes long (and undissolved Pb forms underground), so the upper limit was set at 5fflnI.
複合粒体は取鍋内、上注ぎ造塊注入流あるいは下注ぎ造
塊注入管等へ添加することができる。The composite granules can be added to the ladle, to the top pour agglomerate injection stream, to the bottom pour agglomerate injection tube, etc.
更に、複合粒体は連続鋳造用タンディツシュあるいは鋳
型のいずれにも添加できる。タンディツシュに添加する
場合は、取鍋からタンディツシュへの注入溶鋼流が落下
する位置に添加することにより溶鋼自体の撹拌エネルギ
ーを利用できる。次に、鋳型への添加を第１図により説
明する。Additionally, the composite particles can be added to either the tundish or the mold for continuous casting. When adding to the tundish, the stirring energy of the molten steel itself can be utilized by adding it at a position where the molten steel flow from the ladle to the tundish falls. Next, the addition to the mold will be explained with reference to FIG.
溶鋼２はタンディツシュ底部４に設けられたノズル６か
ら鋳型８に鋳込まれるが、本発明の複合粒体１０は気送
用パイプ１２によってノズル６から落下する溶鋼注入流
１４に添加され注入溶鋼の撹拌エネルギーを利用する。Molten steel 2 is poured into a mold 8 from a nozzle 6 provided at the bottom 4 of the tundish, and the composite granules 10 of the present invention are added to the molten steel injection stream 14 falling from the nozzle 6 through a pneumatic pipe 12, and are added to the molten steel injected into the molten steel. Utilizes stirring energy.
なお、鋳型８内の溶鋼２はフラックス１６でカバーされ
ている。Note that the molten steel 2 in the mold 8 is covered with flux 16.
本発明においては、反応性の強い物質粒を第２相粒とし
て含有しているので撹拌エネルギーが存在しない場合に
おいても、ＰｂあるいはＰｂ合金の複合粒体の溶鋼への
添加に際し、第２相粒の溶鋼との反応エネルギーあるい
は蒸発エネルギーを利用することにより、溶鋼へのＰｂ
の均一な拡散、分布を行うことができる。In the present invention, since the highly reactive substance particles are contained as the second phase particles, even in the absence of stirring energy, when adding Pb or Pb alloy composite particles to molten steel, the second phase particles By using the reaction energy or evaporation energy of Pb with molten steel,
can be uniformly diffused and distributed.
第１表に成分を示しｔこＳＡＥ １２Ｌ１４およびＳ
ＡＥ １０Ｌ４５の溶鋼を転炉で出鋼しＰｂ以外の成
分を調整し、第２表に示す如（ＣａＳｉを第２相粒とす
る複合粒体を取鍋、造塊鋳型、あるいは連続鋳造のタン
ディツシュおよび鋳型等゛Ｃ溶鋼に添加した。なお、比
較のため第２相粒を含有しない０．５ｍｍ未満あるいは
１ 、０ ｍａｎ未満のＰｂ粒も同様（こ溶鋼に添加し
て比較例とした。Table 1 shows the ingredients for SAE 12L14 and S
Molten steel of AE 10L45 is tapped in a converter, the components other than Pb are adjusted, and the composite granules with CaSi as the second phase grains are prepared in a ladle, an ingot mold, or a continuous casting tundish as shown in Table 2. For comparison, Pb grains of less than 0.5 mm or less than 1.0 man, which do not contain second phase grains, were also added to the molten steel (this was added to the molten steel as a comparative example).
第 １ 表
これらの溶鋼を鋳造後、直径５０ｍｍの棒鋼としＰｂ粒
の分散状況をマイクロアナライザーで、地底をＪＩＳＧ
Ｏ５５６で調査した。Ｐｂ粒の最大サイズは圧延方向に
ついて調査した。また、超音波探傷試験ＵＴを周波数５
ＭＨｚの垂直探傷法て行い巨大Ｐｂ粒の存在の有無を調
査した。測定は長さ６０００ ｍｍの１５０本について
エコー高さの％で表わした最大数をとり、２０％以下１
．ｔ Ｍ ｎ Ｓからのノイズなので０％とした。また
、直径５０胴の棒鋼までのＰｂ添加歩留を調査した。こ
れらの結果を同じく第２表に示した。Table 1 After casting these molten steels, they were made into steel bars with a diameter of 50 mm, and the dispersion of Pb particles was measured using a microanalyzer using a JISG test.
The investigation was conducted using O556. The maximum size of Pb grains was investigated in the rolling direction. In addition, the ultrasonic flaw detection test UT was carried out at a frequency of 5
The presence or absence of giant Pb grains was investigated using a MHz vertical flaw detection method. Measurements were made by taking the maximum number expressed as a percentage of the echo height for 150 lines with a length of 6000 mm, and taking the maximum number expressed as a percentage of the echo height.
．． Since it is noise from tMnS, it was set to 0%. In addition, the Pb addition yield was investigated for steel bars up to 50 mm in diameter. These results are also shown in Table 2.
第２表において、本発明例はＰｂ粒の分散が良好で、巨
大粒による地底、ＵＴ大欠陥なく、歩留がすぐれている
ことが明らかである。In Table 2, it is clear that the present invention example has good dispersion of Pb grains, no underground defects due to giant grains, and no large UT defects, and has an excellent yield.
本発明は上記実施例からも明らかな如く、溶鋼内におけ
ろ反応性が強い物質粒を第２相粒として′１Ｅｆ１合し
たＰｂあるいはＰｂ合金から成る複合粒体を溶鋼に添加
することにより溶鋼の度拌流や注入流を必要とする。−
となく 、Ｐｂ校が均一に分散した鉛快削鋼の製造が可
能となり、Ｊすまず高速化、自動化される機械加工の要
求に応えられる被削性良好な鉛快削鋼を得ることができ
た。As is clear from the above-mentioned embodiments, the present invention is capable of producing molten steel by adding to molten steel composite grains made of Pb or Pb alloy in which '1Ef1 is combined with grains of highly reactive substances in the molten steel as second phase grains. Requires stirring flow or injection flow. −
This makes it possible to produce lead free-cutting steel in which Pb particles are uniformly dispersed, making it possible to obtain lead free-cutting steel with good machinability that can meet the demands of high-speed, automated machining. Ta.
第１図は本発明実施例における複合体の溶鋼への添加を
示す鋳型の断面図である。
２・・取鍋 ４・・タンディツシュ底
部８・鋳型 １０−複合粒体１２・・気送
用パイプFIG. 1 is a sectional view of a mold showing the addition of a composite to molten steel in an example of the present invention. 2. Ladle 4. Tundish bottom 8. Mold 10-Composite granules 12. Pneumatic pipe
Claims (5)
る鉛快削鋼の製造方法において、溶鋼内における反応性
が強い物質粒を第２相粒として混合したＰｂもしくはＰ
ｂ合金から成る複合粒体を前記溶鋼に添加することを特
徴とする鉛快削鋼の製造方法。(1) In a method for manufacturing lead free-cutting steel having a composition of Pb: 0.03 to 0.4% by weight, Pb or Pb is mixed with particles of highly reactive substances in molten steel as second phase particles.
A method for producing lead free-cutting steel, which comprises adding composite grains made of B alloy to the molten steel.
の範囲第１項に記載の鉛快削鋼の製造方法。(2) The method for manufacturing lead free-cutting steel according to claim 1, wherein the composite particles have a diameter of 0.2 to 5 mm.
特許請求の範囲第１項に記載の鉛快削鋼の製造方法。(3) The method for producing lead free-cutting steel according to claim 1, wherein the composite granules are added to the molten steel in the ladle.
て前記溶鋼に添加する特許請求の範囲第１項に記載の鉛
快削鋼の製造方法。(4) The method for producing lead free-cutting steel according to claim 1, wherein the composite particles are added to the molten steel in a continuous casting tundish.
添加する特許請求の範囲第１項に記載の鉛快削鋼の製造
方法。(5) The method for producing lead free-cutting steel according to claim 1, wherein the composite particles are added to the molten steel in a continuous casting mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29002485A JPS62149843A (en) | 1985-12-23 | 1985-12-23 | Production of lead free cutting steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29002485A JPS62149843A (en) | 1985-12-23 | 1985-12-23 | Production of lead free cutting steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62149843A true JPS62149843A (en) | 1987-07-03 |
Family
ID=17750801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29002485A Pending JPS62149843A (en) | 1985-12-23 | 1985-12-23 | Production of lead free cutting steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62149843A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103469113A (en) * | 2013-08-01 | 2013-12-25 | 西安建筑科技大学 | Process for increasing lead yield in smelt of free-cutting stainless steel used for nibs |
-
1985
- 1985-12-23 JP JP29002485A patent/JPS62149843A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103469113A (en) * | 2013-08-01 | 2013-12-25 | 西安建筑科技大学 | Process for increasing lead yield in smelt of free-cutting stainless steel used for nibs |
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