JP2638298B2 - A method for determining the carbon equivalent, carbon content and silicon content of cast iron, as well as predicting its physical and mechanical properties - Google Patents
A method for determining the carbon equivalent, carbon content and silicon content of cast iron, as well as predicting its physical and mechanical propertiesInfo
- Publication number
- JP2638298B2 JP2638298B2 JP2507426A JP50742690A JP2638298B2 JP 2638298 B2 JP2638298 B2 JP 2638298B2 JP 2507426 A JP2507426 A JP 2507426A JP 50742690 A JP50742690 A JP 50742690A JP 2638298 B2 JP2638298 B2 JP 2638298B2
- Authority
- JP
- Japan
- Prior art keywords
- cast iron
- carbon
- content
- iron
- silicon
- 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.)
- Expired - Fee Related
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims description 30
- 229910001018 Cast iron Inorganic materials 0.000 title claims description 28
- 229910052799 carbon Inorganic materials 0.000 title claims description 26
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims description 17
- 229910052710 silicon Inorganic materials 0.000 title claims description 17
- 239000010703 silicon Substances 0.000 title claims description 17
- 238000000034 method Methods 0.000 title claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 26
- 238000001816 cooling Methods 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 15
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 13
- 230000008023 solidification Effects 0.000 claims description 13
- 238000007711 solidification Methods 0.000 claims description 13
- 229910052714 tellurium Inorganic materials 0.000 claims description 13
- 230000005496 eutectics Effects 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical group [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 8
- 229910052797 bismuth Inorganic materials 0.000 claims description 8
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical group [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 8
- 229910052796 boron Chemical group 0.000 claims description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 7
- 229910001567 cementite Inorganic materials 0.000 claims description 7
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052725 zinc Inorganic materials 0.000 claims description 7
- 239000011701 zinc Substances 0.000 claims description 7
- 238000002076 thermal analysis method Methods 0.000 claims description 4
- 238000002425 crystallisation Methods 0.000 claims description 3
- 230000008025 crystallization Effects 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- 238000005259 measurement Methods 0.000 description 9
- 238000005266 casting Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000011161 development Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 229910052684 Cerium Inorganic materials 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- ZMIGMASIKSOYAM-UHFFFAOYSA-N cerium Chemical compound [Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce] ZMIGMASIKSOYAM-UHFFFAOYSA-N 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229910001141 Ductile iron Inorganic materials 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 229910002056 binary alloy Inorganic materials 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001037 White iron Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- QNDQILQPPKQROV-UHFFFAOYSA-N dizinc Chemical compound [Zn]=[Zn] QNDQILQPPKQROV-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は鋳鉄の熱分析による冷却曲線を正確に測定し
これより鋳鉄中の炭素当量、炭素量および珪素量を判定
し、併せて鋳鉄の物理的、機械的諸性質を予測し、鋳造
工場の鋳造前工程の炉前管理を充分にする事及び高炉よ
りの出銑溶湯の測定を目的とする測定方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention accurately measures a cooling curve of a cast iron by thermal analysis, and determines a carbon equivalent, a carbon content and a silicon content in the cast iron based on the measured cooling curve. The present invention relates to a measurement method for predicting physical and mechanical properties, sufficiently controlling the pre-furnace of a pre-casting process in a foundry, and measuring a molten metal from a blast furnace.
炭素当量の測定の原理は鋳鉄の溶湯が凝固する際に最
初の熱停止温度（液相線であるところの初晶）、本来
鉄、炭素、珪素の基本的に三元系であるものを擬二元系
として炭素当量とするもので、炭素当量には種々の表し
方があるが、最も一般的に使用されているのはＣ％＋1/
3（Si％＋Ｐ％）であり更に共晶温度を測定し、これら
と液体、液体＋固体、固体の相互関係を検討し珪素量、
炭素量を判定し、更に凝固に至るまでの時間を関数とし
て鋳鉄の物理的、機械的諸性質を予測出来るもので実際
の鋳物の形状、材質等の変化によってこれらの数値を補
正し解析が行われ、注湯前に予め用意された当該技術に
よって製作されたカップによって、他の如何なる分析方
法より迅速であり、かつ現場的であり正確に溶湯の状態
を知り鋳込む前に管理する事が出来ると共に、目的とす
る組成や諸性質と異なる場合には適切な事前処理を実施
出来るものである事が知られている。これ等公知技術と
して従来米国特許3267732号や之に基く特許820206号等
があるが、何れもこの目的を十分に達成し得ない状況に
ある。The principle of the measurement of carbon equivalent is to simulate the initial heat stop temperature (primary crystal where it is the liquidus line) when the molten cast iron solidifies, and simulate the fundamentally ternary system of iron, carbon and silicon. The binary system has a carbon equivalent. There are various ways of expressing the carbon equivalent, but the most commonly used is C% + 1 /
3 (Si% + P%). Further, the eutectic temperature was measured, and the relationship between these and liquid, liquid + solid, and solid was examined to determine the silicon content,
It can determine the carbon content and predict the physical and mechanical properties of cast iron as a function of the time until solidification.These values are corrected according to changes in the actual casting shape and material, and analysis is performed. With the cup prepared by the technology prepared before pouring, it is quicker than any other analysis method, and it is possible to know the state of the molten metal accurately and manage it before casting. It is known that appropriate pre-processing can be performed when the composition and properties are different from the intended ones. Conventionally, there are U.S. Pat. No. 3,277,732 and U.S. Pat. No. 8,206,206 based on the above-mentioned known techniques, but none of them can sufficiently achieve this object.
前述の如き従来技術が提案された時期に比し、鋳造業
界の現状は、鋳造材質の選択の巾が大きく拡がり、コン
パクテッドグラファイト鋳鉄（COMPACTED GRAPHITE IRO
N、いわゆるCV鋳鉄）やオーステンパードダクタイル鋳
鉄（Austemperd Ductile IronいわゆるADI鋳鉄）等の出
現、又、合金鋳鉄の進歩発展等による高度な要望により
尚一層の迅速にして、しかも正確なる現場的炉前溶湯管
理技術が要求されて来たのである。即ち鉄、炭素系は２
元系であり、鉄、炭素、珪素等は三元系であり、二元系
では共晶温度は一定であり、三元系では共晶温度は最高
と最低があり、鋳鉄では珪素の含有量によって影響が大
きく、更に合金鋳鉄の添加元素によってある元素では共
晶温度は上昇し、ある元素では共晶温度は低下する等多
様化して来ており、更に複雑にしているのは基本的な
鉄、炭素、珪素の三元系の凝固には鉄、炭素（グラファ
イト）、珪素系の安定凝固と鉄：炭素（セメンタイト）
・珪素系の準安定凝固の二つ平衡が存在している事であ
る。Compared to the time when the prior art was proposed as described above, the current state of the casting industry has greatly expanded the range of choices of casting materials, and has enabled the development of compacted graphite cast iron (COMPACTED GRAPHITE IRO).
N, so-called CV cast iron) and Austemperd Ductile Iron (so-called ADI cast iron), etc., as well as advanced demands due to the development and development of alloy cast iron, etc., further quicker and more accurate on-site furnace Pre-molten metal management technology has been required. That is, iron and carbon are 2
It is a ternary system, iron, carbon, silicon, etc. are ternary systems, eutectic temperatures are constant in binary systems, eutectic temperatures are highest and lowest in ternary systems, and silicon content in cast iron The eutectic temperature increases for some elements and the eutectic temperature decreases for some elements, depending on the additional elements in the alloy cast iron. Iron, carbon (graphite), silicon-based stable solidification and iron: carbon (cementite) for ternary solidification of iron, carbon and silicon
-The two equilibrium of silicon-based metastable solidification exists.
しかも冷却速度の変化や添加元素の相違により、しば
しば同一溶湯の中で交互に二つの平衡が起る事がある。
こうした複平衡の問題が、この鋳鉄系の凝固を複雑にし
ているものである。最近の様にキュポラの操業が公害規
制により次第に電気炉溶解に移行しゝつある現状で溶解
後の経過時間による溶湯の変化による特性変化、簡単な
溶湯の組成の変化のみでなく溶湯中の酸素量、酸化物、
或は溶存酸素量の問題は鋼のみでなく鋳鉄にも大きな問
題となりつゝある。このため従来の熱分析方法では満足
し得ない状況が出現しているものである。このため初晶
温度のみでなく共晶温度も正確に測定しなければならな
いのであり安全な白銑化状態（鉄、セメンタイト系）で
冷却曲線を測定しなければならず準安定凝固による測定
が必要となるのは冷却曲線のみでなく他の発光分析法、
Ｘ線分析法等の機器分析試料にも必須条件となって来て
いる。本発明はこうした点に着目し、従来技術の準安定
凝固促進剤としてのテルル、ビスマス、ホウ素等の黒鉛
化阻害元素添加方法としての前記特許発明に基く測定用
カップ内にチルウオッシュ等の塗料として、或は金属テ
ルルの粉粒等のカップ内添加等があるが、これらは常に
一定の割合で正確に添加されているかは甚だ疑問であ
り、鋳鉄の溶湯の試料からいつも正しい初晶および共晶
温度が得られているか問題であり、特許820206号に記載
されている特許請求の範囲にある冷却曲線を得る方法に
於て……安定剤としてビスマス、ホウ素、セリウム、
鉛、マグネシウム及びテルルおよびそれ等の化合物およ
び混合物を湯の中に添加する……と記載してあるが、セ
リウム、マグネシウム等は代表的なダクタイル鋳鉄の球
状化反応剤であり且つ球状化安定剤であり、鉄、セメン
タイト系の準安定凝固の平衡状態を乱し、初晶、共晶の
各温度の測定を困難にするものである。初晶、共晶の測
定は当然の事ながら平衡状態を測定して始めて得られる
ものである。セリウム、マグネシウム等は黒鉛の球状化
の前に必ず脱酸、脱硫、脱炭の過程を経ているものであ
り炭素当量、炭素量を測定する際に脱炭作用を得る元素
を使用する事は不都合である事は明白である。Moreover, due to changes in the cooling rate and differences in the added elements, two equilibriums often occur alternately in the same molten metal.
Such a problem of double equilibrium complicates the solidification of the cast iron system. In recent years, the operation of cupolas has gradually shifted to electric furnace melting due to pollution regulations.In the current situation, changes in properties due to changes in molten metal due to elapsed time after melting, changes in composition of molten metal as well as oxygen in molten metal Quantity, oxide,
Alternatively, the problem of dissolved oxygen content is becoming a serious problem not only in steel but also in cast iron. For this reason, a situation that cannot be satisfied by the conventional thermal analysis method has appeared. Therefore, not only the primary crystallization temperature but also the eutectic temperature must be measured accurately, and the cooling curve must be measured in a safe white iron state (iron, cementite system), and measurement by metastable solidification is necessary. It is not only the cooling curve but other emission analysis methods,
It is becoming an essential condition for instrumental analysis samples such as X-ray analysis. The present invention focuses on this point, and as a paint such as chill wash in a measuring cup based on the patented invention as a method for adding a graphitization inhibiting element such as tellurium, bismuth, and boron as a metastable solidification accelerator of the prior art. Or addition of metallic tellurium powder in a cup, etc., but it is extremely doubtful that these are always added accurately at a constant ratio. It is a matter of whether the temperature is obtained or not, and in the method of obtaining a cooling curve as claimed in patent 820206, in which bismuth, boron, cerium,
Lead, magnesium and tellurium and their compounds and mixtures are added to hot water. Cerium, magnesium and the like are typical ductile iron spheroidizing reactants and spheroidizing stabilizers. This disturbs the equilibrium state of metastable solidification of iron and cementite, making it difficult to measure the temperatures of primary crystals and eutectics. The measurement of the primary crystal and the eutectic can be naturally obtained only after measuring the equilibrium state. Cerium, magnesium, etc. are always deoxidized, desulfurized and decarburized before spheroidizing graphite, so it is inconvenient to use elements that have a decarburizing effect when measuring carbon equivalent and carbon content. That is obvious.
本発明は前述のような従来技術の諸欠点を改良するた
め種々検討実験の結果本発明の開発に成功したものであ
り、本発明の技術的構成は、鋳鉄の熱分析による冷却曲
線の測定に於て、その冷却曲線測定用カップの内面に、
アルミニウム３〜20重量％、亜鉛３〜20重量％、残部テ
ルルからなる組成の粉粒混合物の圧粉成型体、或は焼結
成型体を固定し、鋳鉄の溶湯を該測定用カップに注湯
し、鋳鉄の冷却曲線上に明確なる鉄、セメンタイト、珪
素の準安定凝固に基く初晶温度、共晶温度を出現させ、
鋳造の炭素当量、炭素量、珪素量を判定すると共にその
物理的、機械的性質をも予測する方法にある。The present invention has succeeded in the development of the present invention as a result of various examination experiments in order to improve the above-mentioned disadvantages of the prior art, and the technical configuration of the present invention is used for measuring a cooling curve by thermal analysis of cast iron. At the inside of the cup for cooling curve measurement,
A powder compact or a sintered compact of a powder-particle mixture having a composition of 3 to 20% by weight of aluminum, 3 to 20% by weight of zinc, and the balance of tellurium is fixed, and a molten cast iron is poured into the measuring cup. Then, the primary crystal temperature and eutectic temperature based on the metastable solidification of iron, cementite, and silicon that appear on the cooling curve of cast iron,
There is a method of determining the carbon equivalent, carbon content, and silicon content of a casting and also predicting its physical and mechanical properties.
前述のとおり、本発明者は充分なる脱酸素効果を有し
少量で且つ合金元素として残留しても鋳鉄の初晶温度、
共晶温度に影響せず、こうした観点よりアルミニウムに
着目し、併せてテルル、ビスマス、ホウ素の準安定凝固
促進剤の効果を高める事が出来るように、又同時にアル
ミニウムの脱酸反応による少量の発熱現象を抑制する目
的で少量の亜鉛の添加により、その発熱を蒸発潜熱で相
殺し準安定凝固の効果をより高め、完全に酸化物、或は
溶存酸素量等の影響を除去し、テルル、ビスマス、ホウ
素等の粉粒体と亜鉛、アルミニウムの粉粒体と混合の上
圧粉成型、或は焼結成型型として冷却曲線測定用カップ
の内側に固定させ、注湯する鋳鉄の溶湯とよく反応し迅
速かつ正確に、鋳鉄の炭素当量、炭素量、珪素量を測定
すると共に該鋳鉄の物理的、機械的性質をも判定するも
のである。As described above, the inventor has a sufficient deoxidizing effect and has a primary crystallization temperature of cast iron, even in a small amount and remaining as an alloy element,
Focusing on aluminum from this point of view without affecting the eutectic temperature, the effect of the metastable solidification accelerator of tellurium, bismuth and boron can be enhanced, and at the same time, a small amount of heat generated by the deoxidation reaction of aluminum By adding a small amount of zinc to suppress the phenomenon, the heat generation is offset by latent heat of vaporization to further enhance the effect of metastable solidification, and completely remove the effects of oxides or dissolved oxygen, and remove tellurium, bismuth Mixing powders such as boron and powders of zinc and aluminum with powder and powder compacting, or fixing as a sintering mold inside the cup for measuring the cooling curve and reacting well with the molten cast iron to be poured It is intended to quickly and accurately measure the carbon equivalent, carbon content, and silicon content of the cast iron and also determine the physical and mechanical properties of the cast iron.
第１図及び第２図に示す冷却曲線測定用カップ（１）
を用いて本発明方法を実施した。該測定用カップ（１）
の内底面には熱電対（３）を包囲してリング状の本発明
成型体（２）を内設してある。前記成型体（２）はテル
ル、ビスマス、ホウ素、亜鉛、アルミニウム等の金属粉
粒体又はその混合物を圧粉成型し又は焼結成型したもの
であり、その好適な組成範囲は前述した諸理由から下記
の範囲である。Cup (1) for measuring a cooling curve shown in FIGS. 1 and 2
Was used to carry out the method of the present invention. The measuring cup (1)
A ring-shaped molded body of the present invention (2) surrounding the thermocouple (3) is provided on the inner bottom surface. The compact (2) is formed by compacting or sintering a metal powder such as tellurium, bismuth, boron, zinc, or aluminum or a mixture thereof, and the preferable composition range is as described above. The range is as follows.
アルミニウム 3〜20重量％ 亜 鉛 3〜20重量％ テ ル ル 残 部 また、前記テルル含有量の１部の50重量％までビスマ
ス、ホウ素で置換する事が出来る。Aluminum: 3 to 20% by weight Zinc: 3 to 20% by weight Tellurium balance Further, up to 50% by weight of one part of the tellurium content can be replaced with bismuth or boron.
これら組成成分範囲は前記範囲未満では本発明の所期
目的が達成されず、その上限値を超える添加量では徒ら
に高価な元素を浪費するものにすぎないものである事は
実験の結果確認された。Experimental results confirm that the intended purpose of the present invention is not achieved if these composition component ranges are less than the above ranges, and that if the added amount exceeds the upper limit, only expensive elements are wasted. Was done.
なお前記図面に示す測定用カップ内における成型体
（２）の配置関係は最良の態様を示したものであり、成
型体の測定用カップ内への配設を図示のものに限定する
ものではない。The arrangement relationship of the molded body (2) in the measuring cup shown in the drawing is the best mode, and the arrangement of the molded body in the measuring cup is not limited to the illustrated one. .
実施例１ 成型体組成 アルミニウム 7.3重量％ 亜 鉛 9.7重量％ テ ル ル 残 部 圧粉成型諸条件 前記組成粉粒体を均一に混合し、この混合粉粒を所定
サイズの粉末冶金用ダイスに充填し粉末冶金用プレスに
て約1mm厚さのリング状成型体とした。この際の粉粒体
に粘結剤は一切使用しないが、混合の割合によっては少
量揮発性の粘結剤を使用しても差支えない。このリング
状成型体を図示の如くシエルサンド製の測定用カップ内
の中央底部に圧粉成型体の外径、厚さに適合するポケッ
トを設け前記成型体を圧入しこれを固定するものであ
る。もちろん内径は熱電対保護管の外径より少し大き目
にして成型してあるため熱電対の挿入には差支えない。
このカップ内に溶湯温度1400〜1405℃の被測定鋳鉄を各
種配合組成別に注湯したところ次の結果が得られた。Example 1 Composition of compacted body Aluminum 7.3% by weight Zinc zinc 9.7% by weight Ter Remainder Compaction molding conditions The above-mentioned composition and granules were mixed uniformly, and the mixed particles were filled in a powder metallurgy die of a predetermined size. Then, a ring-shaped molded product having a thickness of about 1 mm was formed by a press for powder metallurgy. No binder is used for the powder at this time, but a small amount of volatile binder may be used depending on the mixing ratio. As shown in the figure, a pocket suitable for the outer diameter and thickness of the green compact is provided in the center bottom of a shell sand measuring cup as shown in the figure, and the compact is pressed in and fixed. . Of course, since the inner diameter is slightly larger than the outer diameter of the thermocouple protection tube and molded, there is no problem in inserting the thermocouple.
When the cast iron to be measured having a molten metal temperature of 1400 to 1405 ° C. was poured into the cup according to each composition, the following results were obtained.
実施例２ アルミニウム 6.94重量％ 亜 鉛 9.72重量％ ビスマス 10.50重量％ テ ル ル 残 部 の混合物を実施例１と同様に成型体として用いて同様の
測定操作を行ったところ実施例１とほゞ同様の結果が得
られた。また、テルルの一部をホウ素で置換した場合も
ほゞ同様の結果が得られた。 Example 2 Aluminum 6.94 wt% Zinc 9.72 wt% Bismuth 10.50 wt% Ter The remaining mixture was used as a molded body in the same manner as in Example 1 to perform a similar measurement operation. Was obtained. In addition, almost the same results were obtained when part of tellurium was replaced with boron.
本発明による作用、効果を列記すれば以下のとりであ
る： （１）測定範囲が広く亜共晶側より過共晶側へ、更に合
金鋳鉄の測定も可能である。The actions and effects of the present invention are listed as follows: (1) The measurement range is wide, and it is possible to measure the alloy cast iron from the hypoeutectic side to the hypereutectic side.
（２）従来方法のチルウオッシュやテルル等の金属粉粒
の測定カップ内面塗布とは異り常に一定量の組成の添加
剤を正しく添加する事が出来る。チルウオッシュの様に
夫々の測定カップの中のテルル等の量が或は高く或は低
く、しばしば冷却曲線上に冷却、いわゆる再輝現象が現
れたりする事によって測定が困難になったりする様な事
を防止出来るものであり、これら複合した添加剤の開発
により三元晶温度の下限値を適格に捕捉し、鉄、セメン
タイト系の準安定凝固領域で常に安定した初晶、共晶温
度を知る事が出来る。(2) Unlike the conventional method of applying metal powder particles such as chill wash and tellurium on the inner surface of a measuring cup, an additive having a constant composition can always be correctly added. As in the case of chill wash, the amount of tellurium or the like in each measuring cup is high or low, and the measurement often becomes difficult due to the appearance of cooling, a so-called re-brightness phenomenon, on the cooling curve. With the development of these composite additives, the lower limit of the ternary temperature can be properly captured and the primary and eutectic temperatures always stable in the metastable solidification region of iron and cementite. I can do things.
（３）以上の結果本発明によれば前記圧粉成型体或は焼
結成型体の該鋳鉄に対する添加量は重量％で0.2−1.0％
で充分目的を達する事が出来、その測定結果は炭素当量
にて±0.05％、炭素量にて±0.05、珪素量に於ても±0.
15％以内として殆んどが100％近く正確に測定される様
になり、鋳造工場の現場炉前溶湯管理方式として、その
能力を充分に発揮する事が出来、更にこれからの鋳造技
術の進歩発展に対応する溶解作業の管理技術に寄与する
事であろう。(3) As described above, according to the present invention, the amount of the green compact or sintered compact added to the cast iron is 0.2-1.0% by weight.
Can achieve the purpose sufficiently, and the measurement result is ± 0.05% in carbon equivalent, ± 0.05 in carbon amount, and ± 0 in silicon amount.
Almost 100% can be measured accurately within 15%, and it can fully demonstrate its ability as a method of managing molten metal in the front of a furnace in a casting factory, and further develop casting technology in the future It will contribute to the management technology of the melting operation corresponding to.
図面の簡単な説明 第１図は本発明方法に用いる冷却曲線測定用カップの
平面図、 第２図は、図１のII−II線に沿った縦断面図。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a cooling curve measuring cup used in the method of the present invention, and FIG. 2 is a longitudinal sectional view taken along the line II-II of FIG.
１…測定用カップ ２…成型体 ３…熱電対DESCRIPTION OF SYMBOLS 1: Measurement cup 2: Molded body 3: Thermocouple
Claims (2)
て、その冷却曲線測定用カップの内面に、アルミニウム
３〜20重量％、亜鉛３〜20重量％、残部テルルからなる
組成の粉粒混合物の圧粉成型体、或は焼結成型体を固定
し、鋳鉄の溶湯を該測定用カップに注湯し、鋳鉄の冷却
曲線上に明確なる鉄、セメンタイト、珪素の準安定凝固
に基く初晶温度、共晶温度を出現させ、鋳鉄の炭素当
量、炭素量、珪素量を判定すると共にその物理的、機械
的性質をも予測する方法。In a method for measuring a cooling curve of a cast iron by thermal analysis, a powder having a composition comprising 3 to 20% by weight of aluminum, 3 to 20% by weight of zinc and the balance tellurium is provided on the inner surface of a cup for measuring the cooling curve. After fixing the green compact or sintered compact of the mixture, the molten iron of the cast iron is poured into the measuring cup, and the iron, cementite, and silicon based on the metastable solidification of the iron, cementite, and silicon clearly defined on the cooling curve of the cast iron are fixed. A method in which the crystallization temperature and the eutectic temperature appear to determine the carbon equivalent, carbon content, and silicon content of cast iron, as well as its physical and mechanical properties.
テルルの一部をビスマス又はホウ素で置換する請求項１
記載の鋳鉄の炭素当量、炭素量、珪素量を判定すると共
にその物理的、機械的性質をも予測する方法。2. The method according to claim 1, wherein part of tellurium, which is a component of the green compact or sintered compact, is replaced with bismuth or boron.
A method of determining the carbon equivalent, carbon content, and silicon content of the cast iron described, and also predicting its physical and mechanical properties.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2507426A JP2638298B2 (en) | 1990-05-16 | 1990-05-16 | A method for determining the carbon equivalent, carbon content and silicon content of cast iron, as well as predicting its physical and mechanical properties |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2507426A JP2638298B2 (en) | 1990-05-16 | 1990-05-16 | A method for determining the carbon equivalent, carbon content and silicon content of cast iron, as well as predicting its physical and mechanical properties |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2638298B2 true JP2638298B2 (en) | 1997-08-06 |
Family
ID=18527361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2507426A Expired - Fee Related JP2638298B2 (en) | 1990-05-16 | 1990-05-16 | A method for determining the carbon equivalent, carbon content and silicon content of cast iron, as well as predicting its physical and mechanical properties |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2638298B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100507533C (en) * | 2006-02-07 | 2009-07-01 | 合肥工大双发信息系统技术有限公司 | Metal liquid integrative performance on-line intelligent checking system |
| CN100507534C (en) * | 2006-02-07 | 2009-07-01 | 合肥工大双发信息系统技术有限公司 | Sensor for metal liquid comprehensive performance on-line detection |
| CN113933338A (en) * | 2021-10-15 | 2022-01-14 | 马鞍山钢铁股份有限公司 | Sintering layered dissection test equipment and test method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5411718A (en) * | 1977-06-28 | 1979-01-29 | Ricoh Co Ltd | Diazo copying material for informediates |
-
1990
- 1990-05-16 JP JP2507426A patent/JP2638298B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5411718A (en) * | 1977-06-28 | 1979-01-29 | Ricoh Co Ltd | Diazo copying material for informediates |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100507533C (en) * | 2006-02-07 | 2009-07-01 | 合肥工大双发信息系统技术有限公司 | Metal liquid integrative performance on-line intelligent checking system |
| CN100507534C (en) * | 2006-02-07 | 2009-07-01 | 合肥工大双发信息系统技术有限公司 | Sensor for metal liquid comprehensive performance on-line detection |
| CN113933338A (en) * | 2021-10-15 | 2022-01-14 | 马鞍山钢铁股份有限公司 | Sintering layered dissection test equipment and test method |
| CN113933338B (en) * | 2021-10-15 | 2024-02-09 | 马鞍山钢铁股份有限公司 | Sintering layered anatomical test equipment and test method |
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