JPS63114936A - Low thermal expansion cast iron and its production - Google Patents
Low thermal expansion cast iron and its productionInfo
- Publication number
- JPS63114936A JPS63114936A JP26213886A JP26213886A JPS63114936A JP S63114936 A JPS63114936 A JP S63114936A JP 26213886 A JP26213886 A JP 26213886A JP 26213886 A JP26213886 A JP 26213886A JP S63114936 A JPS63114936 A JP S63114936A
- Authority
- JP
- Japan
- Prior art keywords
- graphite
- thermal expansion
- cast iron
- low thermal
- less
- 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
- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 69
- 238000011081 inoculation Methods 0.000 claims abstract description 38
- 229910052751 metal Inorganic materials 0.000 claims abstract description 25
- 239000002184 metal Substances 0.000 claims abstract description 25
- 229910052785 arsenic Inorganic materials 0.000 claims abstract description 17
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 4
- 239000002054 inoculum Substances 0.000 claims abstract description 3
- 229910052759 nickel Inorganic materials 0.000 claims abstract 3
- 229910017082 Fe-Si Inorganic materials 0.000 claims abstract 2
- 229910017133 Fe—Si Inorganic materials 0.000 claims abstract 2
- 239000000126 substance Substances 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims 2
- 229910002804 graphite Inorganic materials 0.000 abstract description 60
- 239000010439 graphite Substances 0.000 abstract description 60
- 229910045601 alloy Inorganic materials 0.000 abstract description 12
- 239000000956 alloy Substances 0.000 abstract description 12
- 230000035945 sensitivity Effects 0.000 abstract description 7
- 238000013016 damping Methods 0.000 abstract description 4
- 239000000654 additive Substances 0.000 abstract 1
- 230000000996 additive effect Effects 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 229910052750 molybdenum Inorganic materials 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- 238000000034 method Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 8
- 238000005266 casting Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 7
- 229910001141 Ductile iron Inorganic materials 0.000 description 5
- 230000005496 eutectics Effects 0.000 description 5
- 150000001247 metal acetylides Chemical class 0.000 description 5
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 229910000599 Cr alloy Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005087 graphitization Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 235000011835 quiches Nutrition 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000002255 vaccination Methods 0.000 description 1
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は超精密加工用工作機部材等に用いるのに適した
低熱膨張鋳鉄とその製造法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a low thermal expansion cast iron suitable for use in ultra-precision machining machine tool members, etc., and a method for producing the same.
従来、工作機用ベッドなどには片状黒鉛鋳鉄が使用され
ていた。この材質の物理的性質及び機械的性質はＲＴ〜
１００℃の熱膨張係数が１０〜１２’Ｘ１０−’程度、
引張強さが１０〜２０ ｋｇｆ／ｍｍ２程度である。近
年、工作機による加工精度の要求が飛躍的に厳しくなり
、これに伴って工作機を構成する材料も気温による寸法
変化の少い低熱膨張材が要求されるようになっている。Traditionally, flake graphite cast iron has been used for machine tool beds. The physical and mechanical properties of this material are RT~
The thermal expansion coefficient at 100℃ is about 10-12'X10-',
The tensile strength is about 10 to 20 kgf/mm2. In recent years, requirements for machining accuracy using machine tools have become dramatically stricter, and along with this, the materials constituting the machine tools are also required to be low thermal expansion materials with little dimensional change due to temperature.
これらの要求に応えるＲＴ〜１００℃の熱膨張係数が５
．０〜６．０Ｘ１０−’程度の鋳鉄材料は、片状黒鉛系
としてはミノ−バー鋳鉄、球状黒鉛系としではニレジス
ト鋳鉄（Ｄ−５）などが以前から存在している。The thermal expansion coefficient from RT to 100°C is 5 to meet these requirements.
．． As cast iron materials of the order of 0 to 6.0 x 10-', minover cast iron has existed for a long time as a flaky graphite-based material, and Niresist cast iron (D-5) as a spheroidal graphite-based material.
しかし、片状黒鉛系材質は、工作機部材に要求される他
の性質である減衰能は大きいものの、引張強さが２０ｋ
ｇｆ／ｆｆ１ｍ２以下と低く 、 ２０ｋｇｆ／ｍｍ”
以上の要求機能部品には適用困難である。However, although flaky graphite-based materials have a high damping capacity, which is another property required for machine tool parts, they have a tensile strength of 20k.
Low gf/ff1m2 or less, 20kgf/mm”
It is difficult to apply this method to the above required functional components.
一方、球状黒鉛鋳鉄系材質は引張強さは４０ｋｇｆ／ｍ
ｍ２以上と高い値を示すが、工作機部品に屡々要求され
る減衰能が低く、要求に応え得ない場合がある。On the other hand, the tensile strength of spheroidal graphite cast iron material is 40 kgf/m.
Although it shows a high value of m2 or more, the damping capacity often required for machine tool parts is low and may not be able to meet the requirements.
Ｎｉを多量に含む鋳鉄を通常用いられているＭｇ系及び
又はＲＥ系の球状化剤を用いて黒鉛の球状化処理を行っ
た場合、共晶状黒鉛（チャンキー黒鉛）又は部分的な球
状化不良黒鉛を屡々発生し、このため機械的性質が著し
く低下することがある６更には球状化処理後の溶湯処理
の有無およびその方法の優劣によって、部品の薄肉部に
は炭化物の発生による熱膨張率の増大と機械的性質およ
び加工性の劣化が、厚肉部においては粗大黒鉛の発生に
よる機械的性質の劣化などの不具合が生じる。When graphite is spheroidized using Mg-based and/or RE-based spheroidizing agents, which are commonly used for cast iron containing a large amount of Ni, eutectic graphite (chunky graphite) or partial spheroidization occurs. Defective graphite is often generated, which can significantly deteriorate mechanical properties.6Furthermore, depending on the presence or absence of molten metal treatment after spheroidization treatment and the quality of that method, thermal expansion due to the generation of carbides in thin-walled parts of parts can occur. In thick-walled parts, problems such as the deterioration of mechanical properties due to the generation of coarse graphite occur in thick-walled parts.
本発明の目的は、まず熱膨張係数が低く、しかも引張強
さが片状黒鉛系低熱膨張鋳鉄より大きく、更に付随機能
としては減衰能が球状黒鉛系低熱膨張鋳鉄よりも大きい
チャンキー黒鉛を含まないＣＶ黒鉛低熱膨張鋳鉄と本鋳
鉄を高品質水準に安定して製造する方法とを提供するも
のである。The purpose of the present invention is to first contain chunky graphite which has a low coefficient of thermal expansion and a tensile strength greater than that of flaky graphite-based low thermal expansion cast iron, and which has an additional function of damping capacity greater than that of spheroidal graphite-based low thermal expansion cast iron. The present invention provides a low thermal expansion cast iron without CV graphite and a method for stably producing cast iron at a high quality level.
ついで、熱膨張係数が極めて低く、しかもチャンキー黒
鉛を含まず肉厚変化による黒鉛形状の変動が小さい球状
黒鉛低熱膨張鋳鉄と本鋳鉄を高品質水準に安定して製造
する方法とを提供するものである。Another object of the present invention is to provide a spheroidal graphite low thermal expansion cast iron that has an extremely low coefficient of thermal expansion, does not contain chunky graphite, and has small variations in graphite shape due to changes in wall thickness, and a method for stably producing the cast iron at a high quality level. It is.
本発明は化学組成が、重量％でＣ１，Ｏ〜２．７％、Ｓ
ｉ０．８〜３．０％、Ｎ１３０−４０％、〜１ｎ１．０
％以下、Ｃｒ３．０％以下、Ｔｉ０．５％以下。The chemical composition of the present invention is C1, O ~ 2.7%, S
i0.8-3.0%, N130-40%, ~1n1.0
% or less, Cr 3.0% or less, Ti 0.5% or less.
Ｓ ｂ 、 Ａ ｓの一種または二種の総量が０．００
２〜０゜０２％、残部は鉄及び不可避的元素よりなる溶
湯にその残留量が０．２％以下となるようにＭｇ及び又
は希土類元素（ＲＥ）を添加した後、Ｆｅ−８ｉを基合
金とする接種剤でその添加総量がＳｉ当量で０．０５％
以上となるような接種を１回以上行なうことを特徴とす
る低熱膨張鋳鉄の製造法と、本製造法で製造され黒鉛組
織が球状化率３０％以上７０％未満のチャンキー黒鉛を
含まないＣｖ黒鉛の低熱膨張鋳鉄、および黒鉛組織が球
状化率７０％以上であるチャンキー黒鉛を含まない球状
黒鉛の低熱膨張鋳鉄である。The total amount of one or both of S b and A s is 0.00
After adding Mg and/or rare earth elements (RE) to the molten metal so that the residual amount is 0.2% or less, the balance is iron and unavoidable elements, and then the Fe-8i-based alloy is The total added amount of the inoculant is 0.05% in terms of Si equivalent.
A method for manufacturing low thermal expansion cast iron characterized by performing inoculation one or more times as described above, and a Cv that does not contain chunky graphite and has a graphite structure with a spheroidization rate of 30% or more and less than 70%. These are low thermal expansion cast iron of graphite, and low thermal expansion cast iron of spheroidal graphite that does not contain chunky graphite and has a graphite structure with a spheroidization rate of 70% or more.
次に本発明の低熱膨張鋳鉄の化学組成数値限定理由につ
いて説明する。Next, the reason for limiting the numerical value of the chemical composition of the low thermal expansion cast iron of the present invention will be explained.
Ｃ：組織中に黒鉛が発生する限界は約０．８％であるが
、１．０％未満では組織中の黒＠量が著しく減少し、鋳
造性および加工性が低下する。C: The limit for graphite generation in the structure is about 0.8%, but if it is less than 1.0%, the amount of black in the structure decreases significantly, resulting in poor castability and workability.
２．７％を超えると特に厚肉鋳物においてキッシュ黒鉛
が多量に晶出して引張強さが低下し、また、鋳造欠陥も
発生し易くなる。If it exceeds 2.7%, a large amount of Quiche graphite will crystallize, especially in thick-walled castings, resulting in a decrease in tensile strength and also making casting defects more likely to occur.
Ｓｉ： ０．８％未満では本来の黒鉛化促進機能が発揮
されず組織中の黒鉛量が著しく減少し、場合によっては
炭化物発生の恐れが生じる。Si: If it is less than 0.8%, the original graphitization promoting function will not be exhibited, and the amount of graphite in the structure will decrease significantly, and in some cases, there may be a risk of generation of carbides.
３．０％を超えると熱膨張係数を低位に抑制することか
困難になると共に靭性が低下する。Ｃ量によってはキッ
シュ黒鉛の発生を促進する。If it exceeds 3.0%, it becomes difficult to suppress the coefficient of thermal expansion to a low level and the toughness decreases. Depending on the amount of C, the generation of quiche graphite is promoted.
Ｎｉ：他の化学組成が本特許請求の範囲においてＮｉが
３０％未満の場合あるいは４０％を超えた場合、何れも
ＲＴ〜１００℃の熱膨張係数が９Ｘ１０−”以上となり
本発明の目的と合致しなくなる。Ni: If other chemical compositions include less than 30% or more than 40% of Ni in the scope of this claim, the coefficient of thermal expansion from RT to 100°C will be 9X10-'' or more, which is consistent with the purpose of the present invention. I won't be able to do it.
Ｍｎ：Ｍｎは鋳鉄溶湯を清浄にし、鋳造欠陥を防止する
ために必要な元素であるが、１％を超えると熱膨張係数
が９Ｘ１０−’以上となり目的に合致しない。Mn: Mn is an element necessary to clean molten cast iron and prevent casting defects, but if it exceeds 1%, the coefficient of thermal expansion becomes 9X10-' or more, which does not meet the purpose.
Ｃｒ：Ｃｒは耐食性を向上するが３％を超えると黒鉛の
晶出が著しく困難になり、薄肉鋳物においては屡々炭化
物を晶出し熱膨張係数が大となる。Cr: Cr improves corrosion resistance, but if it exceeds 3%, it becomes extremely difficult to crystallize graphite, and in thin-walled castings, carbides are often crystallized and the coefficient of thermal expansion increases.
また硬度が上昇し切削性が低下する。Furthermore, hardness increases and machinability decreases.
Ｔｊ、：Ｔｊは黒鉛の形状を安定してＣｖ化するに有効
な元素であるが、含有量の増加と共に熱膨張係数を増大
させ、更には１％を超えると黒鉛の晶出を阻害すると共
に切削性を低下させる。なお、Ｔｊは球状黒鉛系鋳鉄に
は原則として添加しない。Tj: Tj is an effective element for stably converting the shape of graphite into Cv, but as the content increases, the coefficient of thermal expansion increases, and when it exceeds 1%, it inhibits the crystallization of graphite and Decreases machinability. Note that Tj is not added to spheroidal graphite cast iron in principle.
Ｓｂ、Ａｓ：本発明の特徴は通常有害元素として忌避さ
れる。Ｓｂ、Ａｓを一種又は二種以上含有させることに
有る。Sb, As: Features of the present invention are usually avoided as harmful elements. The purpose is to contain one or more of Sb and As.
高Ｎｉ系の鋳鉄溶湯は、Ｍｇ及び又は希土類元素で処理
した場合、極めて共晶状黒鉛（チャンキー黒鉛）を晶出
し易く、最終組織が共晶状黒鉛＋ＣＶ黒鉛又は共晶状黒
鉛子球状黒鉛となり、このために機械的性質が著しく劣
化する。When high Ni-based molten cast iron is treated with Mg and/or rare earth elements, it is extremely easy to crystallize eutectic graphite (chunky graphite), and the final structure is eutectic graphite + CV graphite or eutectic graphite spheroidal graphite. Therefore, the mechanical properties are significantly deteriorated.
Ｓ ｂ 、 Ａ ｓの添加はこの共晶状黒鉛の晶出を抑
制するに顕著な効果が有り、しかも熱膨張係数を増大さ
せない。その含有量の下限はＳｂ、Ａｓの一種又は二種
の総量が０．００２％であり、これ未満では効果が薄い
。The addition of S b and As has a remarkable effect in suppressing the crystallization of this eutectic graphite, and does not increase the coefficient of thermal expansion. The lower limit of the content is 0.002% for the total amount of one or both of Sb and As, and if it is less than this, the effect will be weak.
総量の上限は０．０２％であり、これを超えて含有せし
めるとＭｇ及び又は希土類元素で処理しても組織中に片
状黒鉛が晶出し、安定してＣＶ状黒鉛組織又は球状黒鉛
組織が得難くなる。The upper limit of the total amount is 0.02%, and if the content exceeds this, flaky graphite will crystallize in the structure even if treated with Mg and/or rare earth elements, resulting in a stable CV-shaped graphite structure or spheroidal graphite structure. It becomes difficult to obtain.
Ｍｇ及び又は希土類元素（ＲＥ）：Ｍｇ及び又はＲＥは
低熱膨張鋳鉄の黒鉛形状を球状化率３０以上７０％未満
のＣｖ状または球状化率を７０以上の球状にするために
含有させるものである。ＣＶ黒鉛の低熱膨張鋳鉄を得る
ためには通常Ｍｇ及び又はＲＥを総量で０．００８〜０
．０３％含有せしめる。更にＴｉを０．０５〜０．３％
含有せしめることによって一層安定したＣＶ状黒鉛組織
を得ることができる。Mg and/or rare earth element (RE): Mg and/or RE are included to make the graphite shape of low thermal expansion cast iron into a Cv shape with a spheroidization rate of 30 or more and less than 70% or a spherical shape with a spheroidization rate of 70 or more. . In order to obtain low thermal expansion cast iron of CV graphite, the total amount of Mg and/or RE is usually 0.008 to 0.
．． 03% content. Furthermore, 0.05 to 0.3% Ti
By including it, a more stable CV-shaped graphite structure can be obtained.
球状黒鉛の低熱膨張鋳鉄を得るには通常Ｍｇ及び又はＲ
Ｅの総量を０．０３〜０ 、３％含有せしめる。しかし
ＲＥが０．２％を超えると、接種による溶湯黒鉛化促進
処理を行なっても薄肉鋳物においては炭化物が晶出し易
くなり、熱膨張係数の増大と切削性の低下が起る。To obtain low thermal expansion cast iron of spheroidal graphite, Mg and or R are usually used.
The total amount of E is 0.03 to 0.3%. However, when RE exceeds 0.2%, carbides tend to crystallize in thin-walled castings even if molten metal graphitization promotion treatment by inoculation is performed, resulting in an increase in the coefficient of thermal expansion and a decrease in machinability.
続いて製造法である接種の効果について説明する。第１
表は本発明による球状黒鉛低熱膨張鋳鉄の接種前溶湯化
学組成を示したものである。第２表は本鋳物の肉厚を変
えて接種の効果を調べたものである。−次接種は何れも
Ｆｅ−８ｉ（７５）をＳｉ当量にて０．２％添加し、二
次接種はＦｅ−３ｉ（７３） −Ｃａ（２）−Ａｌ（３
）合金をＳｉ当量で０．１％添加したものである。Next, the effect of inoculation, which is a manufacturing method, will be explained. 1st
The table shows the chemical composition of the molten metal before inoculation of the spheroidal graphite low thermal expansion cast iron according to the present invention. Table 2 shows the results of investigating the effect of inoculation by varying the wall thickness of the casting. - Fe-8i (75) was added at 0.2% Si equivalent for both secondary inoculations, and Fe-3i (73) -Ca(2)-Al(3
) alloy added in an amount of 0.1% in terms of Si equivalent.
第１表 （ｗｔ％）
第２表
注：（）は炭化物発生
発明者等は、実験によって５ｍｍの肉厚鋳物において注
湯流に対し８１当量で０．０５％の接種を行なうことに
より、炭化物が消失することを確認した。尚、ここでは
球状黒鉛低熱膨張鋳鉄における結果を例示したが、ＣＶ
黒鉛低熱膨張鋳鉄においても接種による黒鉛粒数の増加
および球状化率の肉厚差での安定性は同様の傾向を示す
ことを確認している。Table 1 (wt%) Table 2 Note: () indicates carbide generation The inventors experimentally found that carbides were generated by inoculating 81 equivalents of 0.05% into the poured metal flow in 5 mm thick castings. confirmed to disappear. Note that although the results for spheroidal graphite low thermal expansion cast iron are illustrated here, CV
It has been confirmed that the increase in the number of graphite grains due to inoculation and the stability of the spheroidization rate with differences in wall thickness show similar trends in graphite low thermal expansion cast iron.
以下本発明の実施例をさらに詳細に説明する。Examples of the present invention will be described in more detail below.
〔実施例、１〕
Ｎｉを含む戻り肩、金属Ｎｌを主体とする原料を３００
ｋｇ高周波電気炉にて熔解し、これにＣｒ合金、Ｔｊ合
金及びその他成分調整用合金を添加して元湯とした。[Example 1] Return shoulder containing Ni, raw material mainly composed of metal Nl
kg was melted in a high-frequency electric furnace, and a Cr alloy, a Tj alloy, and other alloys for adjusting the composition were added thereto to form a base melt.
この元湯を逐次６０ｋｇづつ分は湯して下記５項目の実
験を行なった。The following five experiments were conducted by sequentially using this source hot water for 60 kg each.
まず溶湯処理の方法及び鋳型について説明する。First, the molten metal processing method and mold will be explained.
１、溶湯処理
（イ）Ｃｖ化処理
Ｆｅ−５ｉ（４５） Ｍｇ（４，５）−ＲＥ（１，５
）合金を溶湯量に対し０．４５％を取鍋の底にセットし
上方より溶湯を注湯するいわゆるサンドイクチ法に依っ
た。1. Molten metal treatment (a) Cv treatment Fe-5i (45) Mg (4,5)-RE (1,5
) The so-called sandwich method was used, in which 0.45% of the molten metal was set at the bottom of a ladle and the molten metal was poured from above.
（ロ）ｓｂ及びＡｓの添加
後述の試料１及び２を採取した残湯１８０ｋｇに対し、
ｓｂの０．０２％、Ａｓの０．００５％を炉中でホスホ
ライザーにより添加した。(b) Addition of sb and As For 180 kg of residual hot water from which Samples 1 and 2 described below were collected,
0.02% of sb and 0.005% of As were added by a phosphorizer in the furnace.
（ハ）接種
一次接種はＣｖ化処理が完了した取鍋溶湯表面にＦｅ−
３ｉ（７５）合金をＳｉ当量で溶湯量の０．３％添加し
攪拌する方法とした。(c) Inoculation The primary inoculation is Fe-
3i(75) alloy was added in an Si equivalent amount of 0.3% of the amount of the molten metal and stirred.
二次接種はＦｅ −５Ｌ（７３）−Ｃａ（２）−Ａｌ（
３）合金粒を、注湯量の０．１％鋳型への注湯流中へ添
加する方法とした。Secondary inoculation was Fe-5L(73)-Ca(2)-Al(
3) A method was adopted in which alloy grains were added to the flow of molten metal in an amount of 0.1% of the amount of molten metal poured into the mold.
尚、接種処理を行なわない溶湯に対しては、予めＣＶ化
処理合金と共にＦｅ−５ｉ（７５）合金の接種によるＳ
Ｌ増量に見合う量をセットした。In addition, for molten metal that is not subjected to inoculation treatment, S is inoculated with Fe-5i (75) alloy together with the CV treated alloy in advance.
I set the amount commensurate with the L increase.
２、鋳型
肉厚２５ｍｍと７５ｍｍのＹブロック鋳型に同一溶湯を
注湯することにより、ｓｂおよびＡｓの添加の有無およ
び接種処理の有無と方法が肉厚感度に及ぼす影響を検討
した。2. By pouring the same molten metal into Y block molds with mold wall thicknesses of 25 mm and 75 mm, we investigated the effects of the presence or absence of addition of sb and As, and the presence or absence and method of inoculation treatment on wall thickness sensitivity.
次にＣＶ系鋳鉄５種類の実験の方法及び目的について説
明する。Next, the method and purpose of experiments on five types of CV cast iron will be explained.
ａ、実験１
元湯に対しｓｂおよびＡｓの添加を行なわず、取鍋中で
黒鉛のＣｖ焙処理行なって一次及び二次の接種をせずに
注湯した。a. Experiment 1 SB and As were not added to the starting hot water, graphite was subjected to Cv roasting in a ladle, and the hot water was poured without primary or secondary inoculation.
ｂ、実験２
実験１に対し一次及び二次の接種をすることによる効果
を検討した。b. Experiment 2 In contrast to Experiment 1, the effects of primary and secondary inoculation were investigated.
Ｃ６実験３
元湯に対しｓｂおよびＡｓを添加し、黒鉛のＣＶ化処理
を行なって、−次及び二次の接種をせずに注湯した。実
験１との対比によりｓｂ及びＡｓ添加によるチャンキー
黒鉛の防止効果とそれによる機械的性質の影響を検討し
た。C6 Experiment 3 SB and As were added to the starting water, CV treatment of graphite was performed, and the water was poured without subsequent or secondary inoculation. In comparison with Experiment 1, the effect of preventing chunky graphite by adding sb and As and its influence on mechanical properties was investigated.
ｄ、実験４
実験３に対し一次接種のみを行なって注湯し一次接種の
効果を検討した。d. Experiment 4 In contrast to Experiment 3, only primary inoculation was performed and hot water was poured to examine the effect of primary inoculation.
ｅ、実験５
実験４に対し二次接種も行なって注湯し二次接種の効果
を検討した。e. Experiment 5 A secondary inoculation was also performed in Experiment 4, and the effect of the secondary inoculation was investigated by pouring hot water.
各試料の分析結果は鉄と不可避的不純物と第３表に示す
とおりであった。尚試料Ｎｏは上記実験Ｎｏと対応する
。The analysis results for each sample were as shown in Table 3, including iron and inevitable impurities. Note that the sample number corresponds to the above experiment number.
第４表に熱膨張係数（２０〜１００℃）、機械的性質及
び黒鉛組織を示す。Table 4 shows the thermal expansion coefficient (20 to 100°C), mechanical properties, and graphite structure.
第４表 肉厚はｍｍ
〔実施例、２〕
Ｎｉを含む戻り屑、金属Ｎｉを主体とする原料を３００
ｋｇ高周波電気炉にて熔解し、これにＣｒ合金、及びそ
の他成分調整用合金を添加して元湯とした。Table 4 Thickness is mm [Example, 2] Return scrap containing Ni, raw material mainly consisting of metallic Ni is 300 mm
kg was melted in a high-frequency electric furnace, and a Cr alloy and other alloys for adjusting the composition were added thereto to form a base melt.
この元湯を逐次６０ｋｇづつ分は湯して下記５項目の実
験を行なった。The following five experiments were conducted by sequentially using this source hot water for 60 kg each.
まず溶湯処理の方法及び鋳型について説明する。First, the molten metal processing method and mold will be explained.
１、溶湯処理
（イ）球状化処理
Ｆｅ−５ｉ（４５） Ｍｇ（４，５）−ＲＥ（１，５
）合金を溶湯量に対し０．８５％を取鍋の底にセットし
上方より溶湯を注湯するいわゆるサンドイツチ法に依っ
た。1. Molten metal treatment (a) Spheroidization treatment Fe-5i (45) Mg (4,5)-RE (1,5
) The so-called Sanderuch method was used, in which 0.85% of the molten metal was set at the bottom of a ladle and the molten metal was poured from above.
（ロ）ｓｂの添加
後述の試料６及び７を採取した残湯１８０’ｋｇに対し
、Ｓｂ０．０２５％を炉中でホスホライザーにより添加
した。(b) Addition of sb 0.025% of Sb was added to 180 kg of residual hot water from which Samples 6 and 7 described below were taken using a phosphorizer in a furnace.
（ハ）接種
球状化処理が完了した取鍋溶湯に対する一次及び二次接
種は〔実施例、１〕と同様に行なった。(c) Inoculation The primary and secondary inoculations of the molten metal in the ladle that had undergone the spheroidization process were carried out in the same manner as in [Example 1].
尚、接種処理を行なわない溶湯に対しては、予め球状化
処理合金と共にＦｅ−５ｉ（７５）合金の接種によるＳ
ｉ増量に見合う量をセットした。For molten metal that is not subjected to inoculation treatment, S is inoculated with Fe-5i (75) alloy together with the spheroidized alloy in advance.
I set the amount commensurate with the increase.
２、鋳型
肉厚２５ｍｍと７５ｍｍのＹブロック鋳型に同一溶湯を
注湯することにより、Ｓｂ添加の有無および接種処理の
有無と方法が肉厚感度に及ぼす影響を検討した。2. By pouring the same molten metal into Y-block molds with mold wall thicknesses of 25 mm and 75 mm, we investigated the effects of the presence or absence of Sb addition and the presence or absence of inoculation treatment on wall thickness sensitivity.
次に球状黒鉛系鋳鉄５種類の実験の方法及び目的につい
て説明する。Next, the method and purpose of experiments on five types of spheroidal graphite cast iron will be explained.
ａ、実験６
元湯に対しＳｂ添加を行なわず、取鍋中で黒鉛の球状化
処理を行なった後、−次及び二次の接種をせずに注湯し
た。a. Experiment 6 After Sb was not added to the starting hot water and graphite was spheroidized in a ladle, the hot water was poured without subsequent or secondary inoculation.
ｂ、実験７
実験５に対し一次及び二次の接種をすることによる効果
を検討した。b. Experiment 7 Regarding Experiment 5, the effects of primary and secondary inoculation were investigated.
Ｃ０実験８
元湯に対しｓｂを添加し、黒鉛の球状化処理を行なった
後、−次及び二次の接種をせずに注湯した。実験６との
対比によりＳｂ添加によるチャンキー黒鉛の防止効果及
び球状化率の向上効果とそれによる機械的性質への影響
を検討した。C0 Experiment 8 After adding sb to the original hot water and performing graphite spheroidization treatment, the hot water was poured without subsequent or secondary inoculation. In comparison with Experiment 6, we examined the effect of adding Sb on preventing chunky graphite and improving the spheroidization rate, and the effect thereof on mechanical properties.
ｄ、実験９
実験８に対し一次接種のみを追加して注湯し一次接種の
効果を検討した。d. Experiment 9 In Experiment 8, only the primary inoculation was added and water was poured to examine the effect of the primary inoculation.
ｂ、実験１０
実験９に対し、更に二次接種を行なって注湯し二次接種
の効果を検討した。b. Experiment 10 In contrast to Experiment 9, secondary inoculation was further performed and hot water was poured to examine the effect of secondary inoculation.
各試料の分析結果は鉄と不可避的不純物と第５表に示す
とおりであった。尚試料Ｎｏは上記実験Ｎｏと対応する
。The analysis results for each sample were as shown in Table 5, including iron and inevitable impurities. Note that the sample number corresponds to the above experiment number.
第５表 （ｗｔ％）
第６表に熱膨張係数（２０〜１００℃）１機械的性質及
び黒鉛組織を示す。Table 5 (wt%) Table 6 shows the thermal expansion coefficient (20 to 100°C) 1 mechanical properties and graphite structure.
第６表 肉厚はｍｍ
〔発明の効果〕
Ｃｖ状黒鉛鋳鉄においては第４表より明らかなようにｓ
ｂおよびＡｓを添加しない試料１および２には何れもチ
ャンキー黒鉛が晶出し機械的性質も低位であるのに対し
、ｓｂおよびＡｓを添加した試料３，４および５は何れ
もチャンキー黒鉛の晶出は観察されず機械的性質も高位
に有る。Table 6 Wall thickness is mm [Effect of the invention] As is clear from Table 4, in Cv graphite cast iron, s
In Samples 1 and 2 without the addition of sb and As, chunky graphite crystallizes and the mechanical properties are low, whereas in Samples 3, 4 and 5 with the addition of sb and As, chunky graphite crystallizes and the mechanical properties are low. No crystallization was observed and the mechanical properties were high.
次に接種の効果を見るにｓｂおよびＡｓの有無にかかわ
らず何れも接種を行なった試料は機械的性質が向上し、
肉厚感度が低くなっている。この傾向は試料４と試料５
を対比すると明白なように二次接種によって顕著に現わ
れる。尚熱膨張係数はｓｂおよびＡｓの添加の有無およ
び接種の有無によって変化は見られない。Next, looking at the effect of inoculation, the mechanical properties of the inoculated samples improved regardless of the presence or absence of sb and As.
Thickness sensitivity is low. This tendency is observed in samples 4 and 5.
As is clear from the comparison, this effect becomes more noticeable after secondary vaccination. Note that the coefficient of thermal expansion does not change depending on whether or not sb and As are added and whether or not there is inoculation.
以上述べたように、ｓｂおよびＡｓを含有させることと
、−次又は二次の接種を行なうことにより。As mentioned above, by including sb and As and by performing subsequent or secondary inoculation.
組織中にチャンキー黒鉛を含まず、機械的性質に優れ、
特に肉厚感受性の低い低熱膨張ＣＶ黒鉛鋳鉄を得ること
ができた。It does not contain chunky graphite in its structure and has excellent mechanical properties.
In particular, low thermal expansion CV graphite cast iron with low wall thickness sensitivity could be obtained.
球状黒鉛鋳鉄に於いては第６表より明らかなようにｓｂ
を添加しない試料６および７には何れもチャンキー黒鉛
が晶出し、機械的性質も低位であるのに対し、Ｓｂを添
加した試料８，９および１０は何れもチャンキー黒鉛の
晶出は観察されず、しかも黒鉛の球状化率が上がり機械
的性質が高位にある。As is clear from Table 6, in spheroidal graphite cast iron, sb
Chunky graphite was crystallized in both samples 6 and 7 without addition of Sb, and the mechanical properties were low, whereas no chunky graphite crystallization was observed in samples 8, 9, and 10 with addition of Sb. Moreover, the spheroidization rate of graphite is increased and the mechanical properties are high.
次に接種の効果を見るにｓｂの添加の有無にかかわらず
、いずれも接種を行なった試料は球状化率と機械的性質
が向上し肉厚感度が低くなっている。この傾向は試料９
と試料１０を対比すると明らかなように二次接種によっ
て更に顕著となる。Next, looking at the effect of inoculation, regardless of whether sb was added or not, the spheroidization rate and mechanical properties of the inoculated samples improved, and the wall thickness sensitivity became lower. This tendency was observed in sample 9.
As is clear from comparing sample 10 and sample 10, it becomes even more noticeable after secondary inoculation.
尚熱膨張係数は試料６ないし試料１０において変化は見
られない。Note that no change in the coefficient of thermal expansion is observed in Samples 6 to 10.
以上述べたようにｓｂを含有させることと、−次又は二
次の接種を行なうことにより、組織中にチャンキー黒鉛
を含まず球状化率が高く、機械的性質に優れ、特に肉厚
感受性の低い低熱膨張球状黒鉛鋳鉄を得ることが出来た
。As mentioned above, by containing sb and performing secondary or secondary inoculation, the structure does not contain chunky graphite, has a high spheroidization rate, has excellent mechanical properties, and is particularly effective against wall thickness sensitivity. We were able to obtain low thermal expansion spheroidal graphite cast iron.
Claims (1)
．８〜３．０％、Ｎｉ３０〜４０％、Ｍｎ１．０％以下
、Ｃｒ３．０％以下、Ｔｉ０．５％以下、Ｍｇ及び又は
希土類元素（ＲＥ）０．２％以下、Ｓｂ、Ａｓの一種ま
たは二種の総量が０．００２〜０．０２％、残部は鉄及
び不可避的元素よりなる低熱膨張鋳鉄。 ２、黒鉛組織が球状化率３０％以上７０％未満である特
許請求の範囲第１項記載の低熱膨張鋳鉄。 ３、黒鉛組織が球状化率７０％以上である特許請求の範
囲第１項記載の低熱膨張鋳鉄。 ４、化学組成が、重量％でＣ１．０〜２．７％、Ｓｉ０
．８〜３．０％、Ｎｉ３０〜４０％、Ｍｎ１．０％以下
、Ｃｒ３．０％以下、Ｔｉ０．５％以下、Ｓｂ、Ａｓの
一種または二種の総量が０．００２〜０．０２％、残部
は鉄及び不可避的元素よりなる溶湯にその残留量が０．
２％以下となるようにＭｇ及び又は希土類元素（ＲＥ）
を添加した後、Ｆｅ−Ｓｉを基合金とする接種剤でその
添加総量がＳｉ当量で０．０５％以上となるような接種
を１回以上行なうことを特徴とする低熱膨張鋳鉄の製造
法。[Claims] 1. Chemical composition is C1.0-2.7% by weight, Si0
．． 8 to 3.0%, Ni 30 to 40%, Mn 1.0% or less, Cr 3.0% or less, Ti 0.5% or less, Mg and/or rare earth elements (RE) 0.2% or less, one type of Sb, As, or A low thermal expansion cast iron in which the total amount of the two types is 0.002 to 0.02%, and the balance is iron and unavoidable elements. 2. The low thermal expansion cast iron according to claim 1, wherein the graphite structure has a spheroidization rate of 30% or more and less than 70%. 3. The low thermal expansion cast iron according to claim 1, wherein the graphite structure has a spheroidization rate of 70% or more. 4. Chemical composition is C1.0-2.7% by weight, Si0
．． 8-3.0%, Ni 30-40%, Mn 1.0% or less, Cr 3.0% or less, Ti 0.5% or less, the total amount of one or both of Sb and As is 0.002-0.02%, The remainder consists of iron and unavoidable elements, and the residual amount in the molten metal is 0.
Mg and/or rare earth elements (RE) to be 2% or less
A method for producing low thermal expansion cast iron, which comprises adding inoculation at least once with an inoculant based on Fe-Si so that the total amount added becomes 0.05% or more in terms of Si equivalent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26213886A JPS63114936A (en) | 1986-11-04 | 1986-11-04 | Low thermal expansion cast iron and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26213886A JPS63114936A (en) | 1986-11-04 | 1986-11-04 | Low thermal expansion cast iron and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63114936A true JPS63114936A (en) | 1988-05-19 |
Family
ID=17371583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26213886A Pending JPS63114936A (en) | 1986-11-04 | 1986-11-04 | Low thermal expansion cast iron and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63114936A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005298887A (en) * | 2004-04-09 | 2005-10-27 | Ito Tekko Kk | Low thermal expansion cast iron material |
| CN109457172A (en) * | 2018-11-01 | 2019-03-12 | 苏州市海威特铸造厂 | A kind of low linear expansion coefficient casting and its casting technique |
| WO2022085642A1 (en) * | 2020-10-23 | 2022-04-28 | 日之出水道機器株式会社 | Iron alloy material for casting and cast iron |
-
1986
- 1986-11-04 JP JP26213886A patent/JPS63114936A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005298887A (en) * | 2004-04-09 | 2005-10-27 | Ito Tekko Kk | Low thermal expansion cast iron material |
| JP4578847B2 (en) * | 2004-04-09 | 2010-11-10 | 伊藤鉄工株式会社 | Low thermal expansion cast iron |
| CN109457172A (en) * | 2018-11-01 | 2019-03-12 | 苏州市海威特铸造厂 | A kind of low linear expansion coefficient casting and its casting technique |
| WO2022085642A1 (en) * | 2020-10-23 | 2022-04-28 | 日之出水道機器株式会社 | Iron alloy material for casting and cast iron |
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