JPS6046311A - Preparation of molten steel containing low melting point metal - Google Patents
Preparation of molten steel containing low melting point metalInfo
- Publication number
- JPS6046311A JPS6046311A JP15549083A JP15549083A JPS6046311A JP S6046311 A JPS6046311 A JP S6046311A JP 15549083 A JP15549083 A JP 15549083A JP 15549083 A JP15549083 A JP 15549083A JP S6046311 A JPS6046311 A JP S6046311A
- Authority
- JP
- Japan
- Prior art keywords
- melting point
- low melting
- point metal
- molten steel
- metals
- 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.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
Abstract
Description
【発明の詳細な説明】
る機械切削性の優れた快削鋼の製造方法に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing free-cutting steel having excellent machinability.
鋼の機械切削性は被剛性付与成分を添加することにより
得られる。特に鉛、ビスマス等の低融点金属を添加する
と、硫黄、燐等を多量に含有する切削性の優れた鋼に一
層良好な機械切削性を付与することが知られている。The machinability of steel can be obtained by adding stiffening components. In particular, it is known that addition of low melting point metals such as lead and bismuth imparts better mechanical machinability to steels containing large amounts of sulfur, phosphorus, etc. and having excellent machinability.
これら、被削性付与成分である鉛、ビスマス等の低融点
金属を溶鋼中へ添加する方法としては、従来よシこれも
の添加金属粒をアルゴン等の不活性ガスとともに固気圧
送を利用して溶鋼中あるいは溶鋼流中へ吹込む方法が一
般的であった。The conventional method for adding low-melting metals such as lead and bismuth, which are components that impart machinability, to molten steel is to use solid-state pumping to add these additional metal particles together with an inert gas such as argon. The most common method was to inject it into molten steel or into a molten steel flow.
またこれらの添加金属を鉄被覆ワイヤーとして溶鋼中へ
挿入添加する方法も試みられていた。Also, attempts have been made to insert these additive metals into molten steel in the form of iron-coated wires.
しかしながら、こわらの方法においては低融点金属源と
して前記の低融点金属単体を用いており、該低融点金属
源を溶鋼中へ均一に添加することが困難であシ、そこで
材質上パラツキのない快削鋼を得ることが困難であると
いう欠点がある。すなわち鉛、ビスマス等の低融金属は
比重が鉄よシも太きく（ｐｂで１１．４，Ｂｉで９，８
）、そのため溶鋼中へ添加されたこれら金属粒はいちは
やく沈降し１太部分溶鋼取鍋底部に偏析し、材質上パラ
ツキのない快削鋼を製造することは、困難であった。ま
たこのような沈降偏析現象は低融点金属を過剰にした鋼
にならないという欠点があった。However, in the Kowara method, the above-mentioned low melting point metal alone is used as a low melting point metal source, and it is difficult to uniformly add the low melting point metal source to molten steel. The disadvantage is that it is difficult to obtain free-cutting steel. In other words, the specific gravity of low-melting metals such as lead and bismuth is higher than that of iron (11.4 for PB, 9.8 for Bi).
), these metal particles added to the molten steel quickly settle and segregate at the bottom of the molten steel ladle in a thick portion, making it difficult to produce free-cutting steel with no material irregularities. In addition, such precipitation segregation phenomenon has the disadvantage that it does not result in steel containing an excess of low melting point metals.
本発明は上記の欠点を有利に解決したものであシ、その
要旨とするところは、溶鋼に低融点金属源全添加し低融
点金属含有溶鋼全製造するに当シ、低融点金属源として
該低融点金属の硫化物を用いることにある。又、低融点
金属と該低融点金属の硫化物、酸化物との混合物を用い
るところにある。The present invention advantageously solves the above-mentioned drawbacks, and the gist thereof is to add all low-melting point metal sources to molten steel, and to produce all molten steel containing low-melting point metals. The purpose is to use a sulfide of a low melting point metal. Also, a mixture of a low melting point metal and a sulfide or oxide of the low melting point metal is used.
以下に先づ本発明に到達するまでに行った実験、測定に
ついて述べる。Below, we first describe the experiments and measurements that were carried out to arrive at the present invention.
本発明者らは低融点金属を溶鋼中へ均一に分散させるた
めの手段について実験全型ね、そして総合的に検討を加
えた。その結果、先づ低融点金属源として従来法である
該低融点金属単体を用いた場合には、溶鋼の攪拌条件、
低融点金属の添加条件をいろいろ変えて製造しても沈降
偏析現象を生じ、均一に分散させることはできないこと
金知った。The present inventors conducted all types of experiments and comprehensively investigated means for uniformly dispersing a low melting point metal into molten steel. As a result, when using the low melting point metal alone as the low melting point metal source in the conventional method, the stirring conditions of molten steel,
I learned that even if the low-melting-point metal was manufactured under various conditions, sedimentation and segregation would occur and uniform dispersion would not be possible.
そこで、沈降偏析現象音生じないか、又は生じるとして
も極微になる低融点金属源を見出すために、低融点金属
源としては（１）比ルが鉄に近く、溶鍋中で懸濁しやす
いこと、（２）低融点金属源が鋼の被削性等利質に悪影
響ヲ及ぼさないことの二点を満足することを重要なポイ
ントとして多くの実（倹全行つｆｃ。Therefore, in order to find a low melting point metal source that does not produce sedimentation and segregation noise, or if it does, it is minimal, the low melting point metal source should be (1) having a ratio close to that of iron and being easily suspended in the molten pot; (2) Many efforts are being made to ensure that the low melting point metal source does not adversely affect the machinability or other properties of the steel.
このような低融点金属源として本発明者らは低融点金属
の硫化物を見出し、実１５へ、ｊｔｌｌ定をおこｌよっ
た。As a source of such a low melting point metal, the present inventors found a sulfide of a low melting point metal, and conducted the jtll determination to Example 15.
その結果。the result.
■ 低融点金属中とくに鋼の被削性を向上させる鉛の安
定な硫化物は、比重が７５９であり、ビスマスの安定な
硫化物は、比重が７３９であシ、前記（１）の条件を滴
しており、溶鋼中で懸濁し取鍋底部に沈降することはほ
とんどないことが明らかになった。■ The stable sulfide of lead, which improves the machinability of low melting point metals, especially steel, has a specific gravity of 759, and the stable sulfide of bismuth has a specific gravity of 739. It became clear that the steel was suspended in the molten steel and almost never settled at the bottom of the ladle.
■ 又低融点金属源の被剛性を向上させる髄黄との化合
物即ち硫化物であるため、一層被削。■ It is also a sulfide, a compound with pulp yolk that improves the rigidity of the low melting point metal source, making it more difficult to cut.
性の優れた鋼を得ることができ、前記（２）の条件を満
すものであることが判明した。It has been found that a steel with excellent properties can be obtained and satisfies the condition (2) above.
本発明は上記実験に基づくものである。The present invention is based on the above experiment.
次に本発明方法に用いられる低融点金属硫化物の好まし
い品位、粒度について述べる。一般に硫化鉛は方鉛鉱と
して、また硫化ビスマスは、輝蒼鉱として天然に産出す
る。これらの鉱石はｉ’ ｂ ｓ 。Next, the preferred grade and particle size of the low melting point metal sulfide used in the method of the present invention will be described. In general, lead sulfide occurs naturally as galena, and bismuth sulfide occurs naturally as diastolite. These ores are i' b s.
Ｂｉ２５３ の純度が比較的高（、該鉱石全そのまま低
融点金属源として用いることもできる。まｆｃ。The purity of Bi253 is relatively high (the whole ore can also be used as a low melting point metal source).
もちろん化学的に合成されたＰｂＳ、Ｂｉ２Ｏ３を使用
してもよい。Of course, chemically synthesized PbS and Bi2O3 may also be used.
これら硫化物中ＰｂＳ、Ｂｉ２８ｇの品位は９０％以上
であればよい。９０％未満であれば不純物による溶鋼汚
染、取鍋耐大物浸食作用が大きくなる。The quality of 28g of PbS and Bi in these sulfides may be 90% or more. If it is less than 90%, contamination of molten steel by impurities and erosion of large objects in the ladle will increase.
また粒度はホッパーよシ済鋼表面へ添加する上方添加方
式では３〜ＳＯＷが適正範囲である。３Ｍ以下では集じ
ん系への吸引比率が高（，５０ｍ以上ではホラノミ−内
でいわゆる棚つシ現象をきたす。まｆｃ浸漬ランスによ
シネ活性ガスと共に溶鋼中へ吹込むインジェクション方
式では安定した吹込みを行うため１，５Ｈ以下が適正範
囲である。１．５ＩＩＪＩ金超えると吹込みの際の管内
摩擦抵抗が大きくなり安定した吹込みがおこなえない。In addition, the appropriate particle size range is 3 to SOW in the upward addition method in which the particles are added to the surface of the steel that has been passed through the hopper. Below 3M, the suction ratio to the dust collection system is high (and above 50m, a so-called "shelf drop" phenomenon occurs in the hollow chamber). However, with the injection method in which FC immersion lance is used to blow into the molten steel along with the cine active gas, stable blowing is not possible. The appropriate range is 1.5H or less for injection.If it exceeds 1.5IIJI, the frictional resistance inside the pipe during injection becomes large and stable injection cannot be performed.
なお、本発明において低融点金属硫化物の添加方式は・
特に限定するものではない。In addition, in the present invention, the method of adding the low melting point metal sulfide is as follows:
It is not particularly limited.
又、低融点金属硫化物を必要に応じすなわち材質要求特
性に応じ、低融点金属、低融点金属酸化物と混合して添
加してもよい。Further, a low melting point metal sulfide may be added in a mixture with a low melting point metal or a low melting point metal oxide as needed, that is, depending on the required characteristics of the material.
鋼の被剛性をコントロールする上で鋼中の低融点金属の
形態をコントロールすることは重要であり、これら上記
の添加物及びその量の選定により鋼材中の低融点金属単
体、低融点金属硫化物、低融点金属の硫化物＋酸化物の
比率を任意にコントロールして、要求される被削性に応
じた’４１ ｋ製造することができる。In order to control the stiffness of steel, it is important to control the morphology of the low melting point metal in the steel, and by selecting the above additives and their amounts, it is possible to control the form of the low melting point metal and low melting point metal sulfide in the steel material. By controlling the ratio of low melting point metal sulfide + oxide, it is possible to manufacture '41k according to the required machinability.
次に本発明の効果について説明する。Next, the effects of the present invention will be explained.
本発明者らは本発明の効果を確認するため。In order to confirm the effects of the present invention.
１００ ｔｏｎ溶鋼を用いた実験をおこなった。An experiment was conducted using 100 tons of molten steel.
この実験における溶鍋の成分及び温度は第１表に示す通
りである。The components and temperature of the melting pot in this experiment are shown in Table 1.
第１表
該溶鋼に低融点金属源として金属鉛粒、硫化鉛（品位９
８％以上工業合成製品）、金属ビスマス、硫化ビスマス
（Ｂ ｌ２Ｓｓ ｒ品位９８チ以上、工業合成製品）で
粒度が３〜１０閣のものを上方添加法によ、！７Ｐｂあ
るいはＢｉ換算で溶鋼に対して０．４％添加した。その
結果、第１図に示す如く鉛源添加溶鋼、ビスマス源添加
溶鋼ともに、単体の金属粒で添加する従来法に比べ硫化
物として添加する本発明法は鉛又はビスマスの歩留が著
しく向上したことが確認された。Table 1 Metallic lead particles, lead sulfide (grade 9
8% or more industrially synthesized product), bismuth metal, bismuth sulfide (Bl2Ssr grade 98% or more, industrially synthesized product) with a particle size of 3 to 10 degrees by the upward addition method! 7 Pb or Bi was added in an amount of 0.4% to the molten steel. As a result, as shown in Figure 1, in both lead source-added molten steel and bismuth source-added molten steel, the yield of lead or bismuth was significantly improved by the method of the present invention in which lead is added as a sulfide, compared to the conventional method in which it is added as a single metal particle. This was confirmed.
これによシ低融点金属添加コストの大ｒｉＪな低減が図
られた。This has led to a significant reduction in the cost of adding low melting point metals.
また本発明法によって得られた鋼塊中の任意の複数部位
のそれぞれのＰｂ、Ｂｉ分析値間のパランキは平均値に
対して±０．０２％であったのに対し。Moreover, the paranki between the respective Pb and Bi analysis values of arbitrary plural parts in the steel ingot obtained by the method of the present invention was ±0.02% with respect to the average value.
さらに本発明法は従来法のように低融点金属添加時に檄
しく発生する粉じんもほとんど皆無であった。Furthermore, in the method of the present invention, unlike the conventional method, almost no dust was generated when low melting point metals were added.
以上の効果確認の実馳から明らかなように１本発明によ
れば、機械切削性に優れ、かつ品質のノ々ラツキが極め
て少ない低融点金属含有快削鋼を低コストで製造するこ
とが可能となった。さらに低融点金属添加時の粉じん発
生等の環境問題も有利に解決され鉄鋼業にとって極めて
有益なものである。As is clear from the confirmation of the above effects, according to the present invention, it is possible to produce at low cost a free-cutting steel containing a low-melting point metal that has excellent machinability and has extremely little unevenness in quality. It became. Furthermore, environmental problems such as dust generation when low-melting point metals are added are advantageously solved, which is extremely beneficial to the steel industry.
代理人 弁理士 秋 沢 政 光 外２名Agent Patent Attorney Masaaki Akizawa 2 people outside
Claims (2)
鋼を製造するに当り低融点金属源として該低融点金属の
硫化物を用いることを特徴とする低融点金属含有溶鋼の
製造方法。(1) A method for producing molten steel containing a low melting point metal, which comprises adding a low melting point metal source to molten steel to produce molten steel containing a low melting point metal, and using a sulfide of the low melting point metal as the low melting point metal source.
鍋を製造するに当シ低融点金爲源として該低融点金属と
該低融点金属の硫化物、酸化物との混合物を用いること
を特徴とする低融点金属含有溶鋼の製造方法。(2) When adding a low melting point metal source to molten steel to produce a molten pot containing a low melting point metal, it is recommended to use a mixture of the low melting point metal and a sulfide or oxide of the low melting point metal as the low melting point metal source. A method for producing molten steel containing low melting point metals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15549083A JPS6046311A (en) | 1983-08-25 | 1983-08-25 | Preparation of molten steel containing low melting point metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15549083A JPS6046311A (en) | 1983-08-25 | 1983-08-25 | Preparation of molten steel containing low melting point metal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6046311A true JPS6046311A (en) | 1985-03-13 |
| JPH0256405B2 JPH0256405B2 (en) | 1990-11-30 |
Family
ID=15607182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15549083A Granted JPS6046311A (en) | 1983-08-25 | 1983-08-25 | Preparation of molten steel containing low melting point metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6046311A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62501081A (en) * | 1984-11-05 | 1987-04-30 | エクストラメ・アンデュストリ−・ソシエテ・アノニム | Processing methods for refining metals and alloys |
-
1983
- 1983-08-25 JP JP15549083A patent/JPS6046311A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62501081A (en) * | 1984-11-05 | 1987-04-30 | エクストラメ・アンデュストリ−・ソシエテ・アノニム | Processing methods for refining metals and alloys |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0256405B2 (en) | 1990-11-30 |
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