JPH05161947A - Manufacture of magnesium-containing free-cutting steel by continuous casting - Google Patents
Manufacture of magnesium-containing free-cutting steel by continuous castingInfo
- Publication number
- JPH05161947A JPH05161947A JP35076091A JP35076091A JPH05161947A JP H05161947 A JPH05161947 A JP H05161947A JP 35076091 A JP35076091 A JP 35076091A JP 35076091 A JP35076091 A JP 35076091A JP H05161947 A JPH05161947 A JP H05161947A
- Authority
- JP
- Japan
- Prior art keywords
- magnesium
- powder
- continuous casting
- containing free
- magnesium sulfide
- 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.)
- Withdrawn
Links
- 239000011777 magnesium Substances 0.000 title claims abstract description 14
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 12
- 238000009749 continuous casting Methods 0.000 title claims abstract description 12
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 229910000915 Free machining steel Inorganic materials 0.000 title claims abstract description 9
- QENHCSSJTJWZAL-UHFFFAOYSA-N magnesium sulfide Chemical compound [Mg+2].[S-2] QENHCSSJTJWZAL-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000000843 powder Substances 0.000 claims abstract description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 20
- 239000010959 steel Substances 0.000 claims abstract description 20
- 239000002245 particle Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 abstract description 8
- 239000011812 mixed powder Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 2
- 238000005520 cutting process Methods 0.000 description 8
- 239000000126 substance Substances 0.000 description 6
- 230000005484 gravity Effects 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- JGIATAMCQXIDNZ-UHFFFAOYSA-N calcium sulfide Chemical compound [Ca]=S JGIATAMCQXIDNZ-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000010730 cutting oil Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Abstract
(57)【要約】
【目的】 マグネシュウム硫化物系介在物を均一分散さ
せた連続鋳造によるマグネシュウム含有快削鋼の製造方
法を提供する。
【構成】 平均粒径５０〜３００μｍの鉄粉と平均粒径
５〜３０μｍのマグネシュウム硫化物粉を、鉄粉とマグ
ネシュウム硫化物粉との体積比を４以上として、あらか
じめ均一に混合した混合粉を連続鋳造のタンデシュ内ま
たは、及びモ−ルド内溶鋼に添加する連続鋳造によるマ
グネシュウム含有快削鋼の製造方法。
【効果】 被削性の優れた連続鋳造法によるマグネシュ
ウム含有快削鋼の製造が可能となる。(57) [Summary] [Object] To provide a method for producing magnesium-containing free-cutting steel by continuous casting in which magnesium sulfide inclusions are uniformly dispersed. [Composition] An iron powder having an average particle diameter of 50 to 300 µm and a magnesium sulfide powder having an average particle diameter of 5 to 30 µm are mixed in advance with a volume ratio of the iron powder and the magnesium sulfide powder being 4 or more to obtain a mixed powder. A method for producing a magnesium-containing free-cutting steel by continuous casting which is added to molten steel in a continuous casting tandem or in a mold. [Effect] It becomes possible to manufacture magnesium-containing free-cutting steel by a continuous casting method with excellent machinability.
Description
【０００１】[0001]
【産業上の利用分野】本発明、マグネシュウム硫化物系
介在物を均一分散させた連続鋳造によるマグネシュウム
含有快削鋼の製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a magnesium-containing free-cutting steel by continuous casting in which magnesium sulfide inclusions are uniformly dispersed.
【０００２】[0002]
【従来の技術】従来、硫化物系介在物質としてマンガン
硫化物、カルシュウム硫化物は良く知られている。これ
らの物質は切削２次剪断域における垂直方向の負荷によ
って塑性変形し、摩擦力を低減させるために被削性を向
上させる。マグネシュウム硫化物もこれらの快削物質と
同様の効果を示すことが推測されるが、マグネシュウム
を鋼に添加する適当な方法がないために利用されていな
いのが実状である。また、マグネシュウムの酸化物生成
自由エネルギ−はカルシュウムのそれより小さいのでカ
ルシュウムよりは酸化されにくい上に、マンガンよりも
硫化物を形成しやすいので、カルシュウムよりも硫化物
として鋼中に残存しやすいと予測される。また、溶鋼よ
りも比重の小さいマグネシュウム硫化物を鋼中に均一に
分散させる方法が開発されれば快削物質として利用でき
ることが期待される。2. Description of the Related Art Conventionally, manganese sulfide and calcium sulfide are well known as sulfide-based intervening substances. These substances are plastically deformed by the vertical load in the secondary cutting shearing region, and improve the machinability in order to reduce the frictional force. It is presumed that magnesium sulfide has the same effect as these free-cutting substances, but it is the fact that it is not used because there is no suitable method for adding magnesium to steel. In addition, since the oxide free energy of magnesium is smaller than that of calcium, it is less likely to be oxidized than calcium, and more easily forms sulfides than manganese. is expected. Further, if a method for uniformly dispersing magnesium sulfide having a specific gravity smaller than that of molten steel in steel is developed, it is expected that it can be used as a free-cutting substance.
【０００３】[0003]
【発明が解決しようとする課題】上述したように、マグ
ネシュウムを鋼に添加する適当な方法がないために利用
されていないのが実状である。しかし、溶鋼よりも比重
の小さいマグネシュウム硫化物を鋼中に均一に分散させ
る方法が開発されれば快削物質として利用できることか
ら種々検討がされたが溶鋼への添加歩留が極めて悪く、
かつ、溶鋼への均一分散が不可能に近く工業的に実用化
されていない。As described above, it is the actual situation that it is not utilized because there is no suitable method for adding magnesium to steel. However, if a method of uniformly dispersing magnesium sulfide having a smaller specific gravity than molten steel was developed in the steel, it could be used as a free-cutting substance, and various studies have been conducted, but the addition yield to molten steel is extremely poor,
Moreover, it is almost impossible to uniformly disperse it in molten steel, and it has not been industrially put to practical use.
【０００４】[0004]
【課題を解決するための手段】本発明者らはかかる実状
に鑑み、種々検討を重ねた結果、被削性の優れた連続鋳
造法によるマグネシュウム含有快削鋼の製造方法を提供
せんとするものである。その発明の要旨とするところ
は、平均粒径５０〜３００μｍの鉄粉と平均粒径５〜３
０μｍのマグネシュウム硫化物粉を、鉄粉とマグネシュ
ウム硫化物粉との体積比を４以上として、あらかじめ均
一に混合した混合粉を連続鋳造のタンデシュ内または、
及びモ−ルド内溶鋼に添加することを特徴とする連続鋳
造によるマグネシュウム含有快削鋼の製造方法にある。SUMMARY OF THE INVENTION The inventors of the present invention have made various investigations in view of the above circumstances, and as a result, intend to provide a method for producing a magnesium-containing free-cutting steel by a continuous casting method having excellent machinability. Is. The gist of the invention is that iron powder having an average particle size of 50 to 300 μm and an average particle size of 5 to 3 are used.
In the tundish of continuous casting, a mixed powder obtained by uniformly preliminarily mixing 0 μm magnesium sulfide powder in a volume ratio of iron powder and magnesium sulfide powder of 4 or more, or
And a method for producing a magnesium-containing free-cutting steel by continuous casting, which is characterized by adding to molten steel in a mold.
【０００５】[0005]
【作用】以下本発明について詳細に説明する。本発明に
おいて、被削性を確保するためにマグネシュウム硫化物
粉の平均粒径の下限を５μｍとした。また、上限につい
ては３０μｍを越えると被削性が飽和することから３０
μｍ以下とした。マグネシュウム硫化物粉を単独添加し
ないで混合粉として添加する理由は、マグネシュウム硫
化物粉は凝集して粉体を形成し体積が増加している上に
比重が溶鋼よりも小さいために単独で添加すると浮上し
て溶鋼中に歩留らないためである。凝集しているマグネ
シュウム硫化物粉を個々のマグネシュウム硫化物粉に分
離して体積を小さくするために鉄粉と混合させた。鉄粉
を選択した理由は溶鋼に添加した際、分離浮上しないた
めである。The present invention will be described in detail below. In the present invention, the lower limit of the average particle size of the magnesium sulfide powder is set to 5 μm in order to secure machinability. If the upper limit is more than 30 μm, the machinability will be saturated, so 30
It was set to not more than μm. The reason for adding magnesium sulfide powder as a mixed powder instead of adding it separately is that magnesium sulfide powder aggregates to form powder and increases in volume, and since it has a smaller specific gravity than molten steel, it is added separately. This is because they do not float and remain in molten steel. The agglomerated magnesium sulfide powder was separated into individual magnesium sulfide powders and mixed with iron powder to reduce the volume. The reason why iron powder is selected is that when it is added to molten steel, it does not float separately.
【０００６】平均粒径５〜３０μｍのマグネシュウム硫
化物粉末が鉄粉表面に機械的に付着して均一分散するた
めには鉄粉の平均粒径の下限は５０μｍ以上であること
が望ましい。上限については寸法が大きくなりすぎると
マグネシュウム硫化物粉と鉄粉とが不均一混合となりや
すいので３００μｍ以下であることが望ましい。鉄粉と
マグネシュウム硫化物粉との体積比を４以上としたの
は、鉄粉表面積を大きくしてマグネシュウム硫化物粉が
付着しやすくするためである。取鍋内溶鋼へ混合粉を添
加すると、酸化物系介在物と複合介在物を生成しやすい
ので混合粉の添加場所はタンデッシュ内及び、又はモ−
ルド内溶鋼に限定した。次に実施例により本発明を具体
的に説明する。In order for the magnesium sulfide powder having an average particle diameter of 5 to 30 μm to be mechanically attached to the surface of the iron powder and uniformly dispersed, the lower limit of the average particle diameter of the iron powder is preferably 50 μm or more. The upper limit is preferably 300 μm or less, because if the size becomes too large, the magnesium sulfide powder and the iron powder are likely to be non-uniformly mixed. The volume ratio of the iron powder and the magnesium sulfide powder is set to 4 or more in order to increase the surface area of the iron powder and facilitate the attachment of the magnesium sulfide powder. When the mixed powder is added to the molten steel in the ladle, oxide-based inclusions and complex inclusions are easily generated. Therefore, the mixed powder is added in the tundish and / or
Limited to molten steel in rud. Next, the present invention will be specifically described with reference to examples.
【０００７】[0007]
【実施例】混合粉は鉄粉とマグネシュウム硫化物粉を炭
化タングステンボ−ルと共に容器に入れて、アジテ−タ
で混合することにより製造した。そのときの鉄粉とマグ
ネシュウム硫化物粉の平均粒径を表１に示す。平均粒径
は各種メッシュのふるいにより分級して、粒度分布図を
作成し、その平均値をもって表示した。このときの鉄粉
の表面は出来るだけ凹凸のあるものが望ましい。また、
硬さは軟らかい方が好ましく、純鉄に近い成分が適して
いる。容量１００ｋｇの高周波溶解炉で低炭素鋼を溶製
して、１００ｋｇ鋳型へ注入し、注入流へプレス成型し
た混合粉を添加した。各チャ−ジ共にマグネシュウム硫
化物の添加は７０ｋｇである。一方、比較材は１００ｋ
ｇ鋳型にＭｇワイヤを注入することにより製造した。い
ずれの鋳片も熱間鋳造により径５０ｍｍの丸棒とした
後、９２０℃×２ｈｒ焼準した。EXAMPLE A mixed powder was produced by placing iron powder and magnesium sulfide powder in a container together with a tungsten carbide ball and mixing them with an agitator. Table 1 shows the average particle diameters of the iron powder and the magnesium sulfide powder at that time. The average particle size was classified by sieving various meshes, a particle size distribution chart was prepared, and the average value was displayed. At this time, it is desirable that the surface of the iron powder be as uneven as possible. Also,
The hardness is preferably soft, and a component close to pure iron is suitable. Low-carbon steel was melted in a high-frequency melting furnace with a capacity of 100 kg, poured into a 100 kg mold, and press-molded mixed powder was added to the casting flow. The addition of magnesium sulfide was 70 kg in each charge. On the other hand, the comparison material is 100k
It was manufactured by injecting Mg wire into a g mold. Each of the cast pieces was formed into a round bar having a diameter of 50 mm by hot casting and then normalized at 920 ° C. for 2 hours.
【０００８】表２に本発明製造法による鋼Ａ，Ｂ，Ｃ，
と比較鋼Ｄ，Ｅ，Ｆ，Ｇ，Ｈの化学成分及びフランク摩
擦幅ＶＢ測定結果を示す。Ｄ，Ｅ，Ｆ，Ｇは混合粉を使
用しているが鉄粉またはマグネシュウム硫化物粉の粒径
が本発明の範囲外であり、Ｈは現状の製造方法、すなわ
ち鋳型にＭｇワイヤを添加することにより製造した鋼で
ある。切削条件は次の通りである。工具材：超硬合金Ｐ
２０、切削方法：長手方向旋削、切削速度：１３０ｍ／
ｍｉｎ、送り：０．２５ｍｍ／ｒｅｖ、切り込み：１．
５ｍｍ、切削油：なし、の条件で４０ｍｉｎ間切削し
て、工具摩耗（ＶＢ）を測定した。シャルピ−試験片は
鍛造方向と平行方向に採取した。Table 2 shows the steels A, B, C according to the manufacturing method of the present invention.
And the chemical compositions of comparative steels D, E, F, G, and H and the flank friction width VB measurement results are shown. D, E, F, and G use mixed powder, but the particle size of iron powder or magnesium sulfide powder is outside the scope of the present invention, and H is the current manufacturing method, that is, adding Mg wire to the mold. It is the steel produced by this. The cutting conditions are as follows. Tool material: cemented carbide P
20, Cutting method: Longitudinal turning, Cutting speed: 130m /
min, feed: 0.25 mm / rev, cut: 1.
Tool wear (VB) was measured by cutting for 40 min under the conditions of 5 mm and no cutting oil. The Charpy test piece was sampled in the direction parallel to the forging direction.
【０００９】[0009]
【表１】 表１のＭｇＳ：マグネシュウム硫化物粉、平均粒径：μ
ｍ、体積比：鉄粉／マグネシュウム硫化物[Table 1] MgS in Table 1: Magnesium sulfide powder, average particle size: μ
m, volume ratio: iron powder / magnesium sulfide
【００１０】表２から明らかなように、本発明Ａ，Ｂ，
Ｃ，は工具摩耗が著しく小さい。鉄粉またはマグネシュ
ウム硫化物粉の粒径が本発明の範囲外である鋼、Ｄ，
Ｅ，Ｆ，Ｇ，Ｈは工具摩耗か衝撃値のいずれかが劣って
いることがわかる。As is clear from Table 2, the inventions A, B,
C, the tool wear is extremely small. Steel having a particle size of iron powder or magnesium sulfide powder outside the scope of the present invention, D,
It can be seen that E, F, G and H are inferior in either tool wear or impact value.
【００１１】[0011]
【表２】 [Table 2]
【００１２】[0012]
【発明の効果】以上の実施例からも明らかなごとく本発
明によれば、被削性の優れた連続鋳造法によるマグネシ
ュウム含有快削鋼の製造が可能となり、工業上の効果は
極めて顕著なものがある。As is apparent from the above examples, according to the present invention, it becomes possible to produce a magnesium-containing free-cutting steel by a continuous casting method having excellent machinability, and the industrial effect is extremely remarkable. There is.
Claims (1)
粒径５〜３０μｍのマグネシュウム硫化物粉を、鉄粉と
マグネシュウム硫化物粉との体積比を４以上として、あ
らかじめ均一に混合した混合粉を連続鋳造のタンデシュ
内または、及びモ−ルド内溶鋼に添加することを特徴と
する連続鋳造によるマグネシュウム含有快削鋼の製造方
法。1. An iron powder having an average particle size of 50 to 300 μm and a magnesium sulfide powder having an average particle size of 5 to 30 μm are mixed in advance by uniformly mixing the iron powder and the magnesium sulfide powder in a volume ratio of 4 or more. A method for producing a magnesium-containing free-cutting steel by continuous casting, characterized in that powder is added to molten steel in a continuous casting tandem or in a mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35076091A JPH05161947A (en) | 1991-12-12 | 1991-12-12 | Manufacture of magnesium-containing free-cutting steel by continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35076091A JPH05161947A (en) | 1991-12-12 | 1991-12-12 | Manufacture of magnesium-containing free-cutting steel by continuous casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05161947A true JPH05161947A (en) | 1993-06-29 |
Family
ID=18412683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35076091A Withdrawn JPH05161947A (en) | 1991-12-12 | 1991-12-12 | Manufacture of magnesium-containing free-cutting steel by continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05161947A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7086151B2 (en) * | 2002-01-24 | 2006-08-08 | Copeland Corporation | Powder metal scrolls |
| US8684711B2 (en) | 2007-01-26 | 2014-04-01 | Emerson Climate Technologies, Inc. | Powder metal scroll hub joint |
| US8955220B2 (en) | 2009-03-11 | 2015-02-17 | Emerson Climate Technologies, Inc. | Powder metal scrolls and sinter-brazing methods for making the same |
-
1991
- 1991-12-12 JP JP35076091A patent/JPH05161947A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7086151B2 (en) * | 2002-01-24 | 2006-08-08 | Copeland Corporation | Powder metal scrolls |
| US7845918B2 (en) | 2002-01-24 | 2010-12-07 | Emerson Climate Technologies, Inc. | Powder metal scrolls |
| US8568117B2 (en) | 2002-01-24 | 2013-10-29 | Emerson Climate Technologies, Inc. | Powder metal scrolls |
| US8684711B2 (en) | 2007-01-26 | 2014-04-01 | Emerson Climate Technologies, Inc. | Powder metal scroll hub joint |
| US8955220B2 (en) | 2009-03-11 | 2015-02-17 | Emerson Climate Technologies, Inc. | Powder metal scrolls and sinter-brazing methods for making the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990311 |