JPH0875686A - Measurement of content of manganese in cast iron - Google Patents
Measurement of content of manganese in cast ironInfo
- Publication number
- JPH0875686A JPH0875686A JP6240747A JP24074794A JPH0875686A JP H0875686 A JPH0875686 A JP H0875686A JP 6240747 A JP6240747 A JP 6240747A JP 24074794 A JP24074794 A JP 24074794A JP H0875686 A JPH0875686 A JP H0875686A
- Authority
- JP
- Japan
- Prior art keywords
- cast iron
- manganese
- molten metal
- content
- eutectic temperature
- 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
Landscapes
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は鋳鉄中のマンガン含量
の測定法に関する。より詳細に述べると、この発明は鋳
鉄の溶湯を熱分析して鋳鉄中のマンガンの含量を測定す
る方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring manganese content in cast iron. More specifically, the present invention relates to a method for measuring the content of manganese in cast iron by thermal analysis of a molten cast iron.
【０００２】[0002]
【従来の技術】鋳鉄の製造に当たって、原材料にスクラ
ップを利用すると、マンガンが混入する。このように鋳
鉄中にマンガンが存在すると鋳鉄を白銑化する傾向があ
るために、チルの発生や引け欠陥の原因となる。したが
って、通常は鋳鉄中のマンガンの含量を１％以下にする
ことが規定されている。2. Description of the Related Art In manufacturing cast iron, when scrap is used as a raw material, manganese is mixed. Thus, the presence of manganese in the cast iron tends to whiten the cast iron, which causes chilling and shrinkage defects. Therefore, it is usually prescribed that the content of manganese in cast iron be 1% or less.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来、
鋳鉄の製造過程において、マンガンの含有量を迅速に測
定する手段がなかったために、使用するスクラップの種
類を厳格に選択する以外に途がなかった。したがって、
鋳鉄の溶湯を凝固させてテストピースを製作し、これを
発光分析法などによって分析していたのである。[Problems to be Solved by the Invention] However, in the past,
In the manufacturing process of cast iron, there was no means to measure the content of manganese rapidly, so there was no choice but to strictly select the type of scrap to be used. Therefore,
The cast iron melt was solidified to produce a test piece, which was analyzed by optical emission analysis.
【０００４】[0004]
【発明の説明】その問題の解決手段として、この発明に
よれば、鋳鉄の溶湯の熱分析に通常使用されている熱電
対を具備するコップ状の試料採取容器に、炉前で注入し
た溶湯に接種剤を溶湯の重量に対して１％以上添加し、
熱電対に接続した自動熱分析装置によって、その鋳鉄の
共晶温度を求め、予め得た共晶温度とマンガン含量との
関係と比較して、溶湯中のマンガン含量を決定する。As a solution to the problem, according to the present invention, the molten metal injected in front of the furnace is put into a cup-shaped sampling container equipped with a thermocouple which is usually used for thermal analysis of molten cast iron. Add 1% or more of inoculant to the weight of molten metal,
The eutectic temperature of the cast iron is obtained by an automatic thermal analyzer connected to a thermocouple, and the manganese content in the molten metal is determined by comparing with the previously obtained relationship between the eutectic temperature and the manganese content.
【０００５】接種剤としては、シリコン系、たとえばＦ
ｅ−５０％Ｓｉ；Ｆｅ−７５％Ｓｉ；特殊の元素を含む
シリコン系、たとえばＣａ−Ｓｉ；Ｆｅ−Ｓｉ−Ｃａ；
Ｆｅ−Ｓｉ−Ｓｒ；Ｆｅ−Ｓｉ−Ｂａ；Ｆｅ−Ｓｉ−
Ｃｅ；Ａｌ−Ｃａ−Ｓｉ；ＲＥ−Ｓｉなどが好ましく、
黒鉛系のものは不適当である。As an inoculant, a silicon type, for example, F
e-50% Si; Fe-75% Si; silicon containing special elements, such as Ca-Si; Fe-Si-Ca;
Fe-Si-Sr; Fe-Si-Ba; Fe-Si-
Ce; Al-Ca-Si; RE-Si and the like are preferable,
Graphite materials are unsuitable.
【０００６】添加する接種剤の量は、接種剤の種類によ
るが、一般に接種剤として使用されているシリコン系の
場合には、図１に示すように、０．８％（ｗｔ）以上の
添加量によって、一定の共晶温度を示す。The amount of the inoculant to be added depends on the kind of the inoculant, but in the case of the silicon type which is generally used as the inoculant, as shown in FIG. 1, addition of 0.8% (wt) or more is added. The amount indicates a constant eutectic temperature.
【０００７】また、この接種温度が一定になる接種剤の
量も対象となる溶湯の性状によって相違するが、長時間
保持することによって、白銑化傾向の強い溶湯であって
も、接種剤をその溶湯の重量に対して１％以上添加する
ことによって、一定の共晶温度を示すものである。The amount of the inoculant for which the inoculation temperature is constant also varies depending on the properties of the target molten metal. However, by holding it for a long time, even if the molten metal has a strong tendency to white pig iron, A constant eutectic temperature is exhibited by adding 1% or more to the weight of the molten metal.
【０００８】この発明の方法によって得られる共晶温度
とマンガン含量との関係は、図２の例に示すように、マ
ンガン含量が増加するにしたがって共晶温度が直線的に
低下している。As for the relationship between the eutectic temperature and the manganese content obtained by the method of the present invention, as shown in the example of FIG. 2, the eutectic temperature decreases linearly as the manganese content increases.
【０００９】[0009]
【発明の作用】鋳鉄の共晶反応には、オーステナイト・
セメンタイト系とオーステナイト・黒鉛系とがある。前
者の共晶反応を利用する技術は、従来からテルルを使用
することが行われている。そして、この共晶温度は溶融
の性状に左右されることなく、溶湯の成分、特にシリコ
ン含有量の影響を大きく受けるものであることから、シ
リコン分析法として実用化されている。The function of the invention is as follows.
There are cementite type and austenite / graphite type. The former technique utilizing the eutectic reaction has conventionally used tellurium. Since the eutectic temperature is largely unaffected by the properties of melting and is greatly influenced by the components of the molten metal, especially the silicon content, it has been put to practical use as a silicon analysis method.
【００１０】後者の共晶反応は、溶湯の共晶凝固に際し
て充分な黒鉛化が行える場合においては、マンガンの含
有量によって大きく影響を受けるものであることから、
マンガン分析法として利用することができる。しかし、
通常は充分に黒鉛化することができないために、溶湯の
性状の影響を大きく受け、白銑化傾向の強い溶湯であれ
ばあるほど、低い共晶温度を呈する。The latter eutectic reaction is greatly affected by the manganese content when sufficient graphitization can be carried out during eutectic solidification of the molten metal.
It can be used as a manganese analysis method. But,
Usually, since it cannot be sufficiently graphitized, it is greatly influenced by the properties of the molten metal, and the more the molten metal having a strong tendency of white pig forming, the lower the eutectic temperature is.
【００１１】したがって、この発明によれば、溶湯の共
晶凝固に際して充分な黒鉛化が行えるように、溶湯の重
量に対して１％以上の接種剤を、予め熱分析用の試料採
取容器に配置しておくことによって、この容器に注入し
た鋳鉄の溶湯を充分に黒鉛化することができ、これによ
って溶湯中のマンガン含量の分析を行うことができる。Therefore, according to the present invention, 1% or more of the inoculant with respect to the weight of the molten metal is placed in advance in the sampling container for thermal analysis so that sufficient graphitization can be performed during eutectic solidification of the molten metal. By doing so, the molten cast iron poured into this container can be sufficiently graphitized, and thereby the manganese content in the molten metal can be analyzed.
【００１２】[0012]
【発明の効果】鋳鉄中にマンガンが存在すると、白銑化
する傾向が強いことから、チルの発生や、引け欠陥の原
因となる。鋳鉄中のマンガンは原材料であるスクラップ
から混入するものであるが、従来は鋳鉄の溶湯中のマン
ガンの含量を迅速に測定する方法がなく、専ら使用する
スクラップの種類を厳格に選定することに依存していた
のである。EFFECTS OF THE INVENTION The presence of manganese in cast iron has a strong tendency to turn white pig iron, which causes chilling and shrinkage defects. Manganese in cast iron is mixed from scrap, which is a raw material, but conventionally, there is no method for quickly measuring the content of manganese in the molten cast iron, and it depends exclusively on strictly selecting the type of scrap to be used. I was doing it.
【００１３】この発明の方法によれば、炉前で、極めて
簡単でしかも容易に鋳鉄中のマンガンの含量を測定する
ことができるので、製造される鋳物の品質の向上に資す
る効果が極めて大きいものである。According to the method of the present invention, the content of manganese in cast iron can be measured very easily and easily in front of the furnace, so that the effect of improving the quality of the cast product produced is extremely great. Is.
【図１】鋳鉄の共晶温度と接種剤添加量との関係を示す
線図である。FIG. 1 is a diagram showing the relationship between the eutectic temperature of cast iron and the amount of inoculant added.
【図２】共晶温度とマンガン含有量との関係を示す線図
である。FIG. 2 is a diagram showing the relationship between eutectic temperature and manganese content.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 久保田 泰司 静岡県磐田郡豊田町赤池32番地 有限会社 日本サブランスプローブエンジニアリング 内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Taiji Kubota 32 Akaike, Toyota-cho, Iwata-gun, Shizuoka Japan Sublance Probe Engineering Co., Ltd.
Claims (3)
前記容器に注入する溶湯の重量に対して１％以上の接種
剤を添加しておくことと、前記試料採取容器に溶湯を注
入してその共晶温度を測定することと、前記測定結果を
予め測定した鋳鉄の共晶温度とマンガン含量との関係と
比較することとから成る鋳鉄中のマンガン含量の測定
法。1. A sampling container for thermal analysis of molten cast iron,
Adding 1% or more of an inoculant to the weight of the molten metal to be poured into the container, measuring the eutectic temperature by injecting the molten metal into the sampling container, A method for measuring manganese content in cast iron, comprising comparing with the relationship between the measured eutectic temperature of cast iron and the manganese content.
ｅ−７５％Ｓｉのいずれか一方とする請求項１に記載の
方法。2. The inoculant is made of Fe-50% Si or F.
The method according to claim 1, wherein one of e-75% Si is used.
Ｃａ；Ｆｅ−Ｓｉ−Ｓｒ；Ｆｅ−Ｓｉ−Ｂａ；Ｆｅ−Ｓ
ｉ−Ｃｅ；Ａｌ−Ｃａ−ＳｉおよびＲＥ−Ｓｉから成る
シリコン系の部類から選択する請求項１に記載の方法。3. The inoculant is Ca-Si; Fe-Si-
Ca; Fe-Si-Sr; Fe-Si-Ba; Fe-S
The method of claim 1 selected from the silicon-based class consisting of i-Ce; Al-Ca-Si and RE-Si.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6240747A JP2750820B2 (en) | 1994-09-09 | 1994-09-09 | Method for measuring manganese content in cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6240747A JP2750820B2 (en) | 1994-09-09 | 1994-09-09 | Method for measuring manganese content in cast iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0875686A true JPH0875686A (en) | 1996-03-22 |
| JP2750820B2 JP2750820B2 (en) | 1998-05-13 |
Family
ID=17064112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6240747A Expired - Fee Related JP2750820B2 (en) | 1994-09-09 | 1994-09-09 | Method for measuring manganese content in cast iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2750820B2 (en) |
-
1994
- 1994-09-09 JP JP6240747A patent/JP2750820B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2750820B2 (en) | 1998-05-13 |
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