JPS625982B2 - - Google Patents
Info
- Publication number
- JPS625982B2 JPS625982B2 JP11798978A JP11798978A JPS625982B2 JP S625982 B2 JPS625982 B2 JP S625982B2 JP 11798978 A JP11798978 A JP 11798978A JP 11798978 A JP11798978 A JP 11798978A JP S625982 B2 JPS625982 B2 JP S625982B2
- Authority
- JP
- Japan
- Prior art keywords
- graphite
- cast iron
- vermicular
- added
- group
- 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
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 42
- 229910001018 Cast iron Inorganic materials 0.000 claims description 21
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 229910052797 bismuth Inorganic materials 0.000 claims description 7
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- 229910052791 calcium Inorganic materials 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 2
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 1
- 239000011575 calcium Substances 0.000 claims 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical group [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims 1
- 239000011777 magnesium Substances 0.000 claims 1
- 229910002804 graphite Inorganic materials 0.000 description 25
- 239000010439 graphite Substances 0.000 description 25
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 229910001141 Ductile iron Inorganic materials 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229910052684 Cerium Inorganic materials 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910014458 Ca-Si Inorganic materials 0.000 description 1
- 229910019064 Mg-Si Inorganic materials 0.000 description 1
- 229910019406 Mg—Si Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 238000001479 atomic absorption spectroscopy Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 230000024121 nodulation Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Description
本発明は、バーミキユラー黒鉛組織を有する強
靭鋳鉄に関するものである。
バーミキユラー黒鉛とは、黒鉛の形状からいえ
ば球状黒鉛と片状黒鉛の中間の形で、芋虫状黒鉛
とか偽球状黒鉛とか珊瑚状黒鉛とか塊状黒鉛とか
呼ばれ、球状黒鉛の不完全な状態として従来認識
されていたもので、球状黒鉛組織中に若干混在す
る状態で知られていた。
従来知られたバーミキユラー黒鉛組織を有する
強靭鋳鉄は通常の球状黒鉛鋳鉄に含有される黒鉛
球状化元素であるMg，Ce族等と共に球状化阻害
元素として、TiおよびまたはZrを比較的多量に
含有することによつて、球状黒鉛の生成が妨げら
れた鋳鉄である。
このバーミキユラー黒鉛鋳鉄は、球状黒鉛鋳鉄
に近い機械的性質を持ち、且つ鋳造性は片状黒鉛
鋳鉄の場合に近く良好で、特に引け巣の発生が少
なく鋳造方案歩留は球状黒鉛鋳鉄にくらべ遥かに
良好である。又、吸振性、熱伝導性、耐摩耗性、
疲労特性が球状黒鉛鋳鉄よりも良好で、吸振性、
熱伝導性は片状黒鉛鋳鉄に近い特性を有する新し
い分野の鋳鉄である。
しかしながら、従来のバーミキユラー黒鉛組織
を有する鋳鉄は、Mg，Ti，Zrの含有許容範囲が
非常に狭く、これら元素の成分組成をわずかに外
れるとバーミキユラー黒鉛組織を有する鋳鉄を得
ることができなかつた。
本発明は、従来のバーミキユラー黒鉛組織を有
する鋳鉄が、その成分組成上非常に製造が困難で
あるという欠点を除去改善した新規な成分組成を
有し、かつ安定してバーミキユラー黒鉛組織を有
する強靭鋳鉄を提供することを目的とするもので
あり、黒鉛球状化能の比較的弱い元素であるCa
のほかに黒鉛球状化能の比較的強い小量のMgお
よびまたはCe族を含有させ、AlおよびまたはBi
をバーミキユラー黒鉛安定化元素として含有させ
たバーミキユラー黒鉛組織を有する強靭鋳鉄に関
するものである。
次に本発明を詳細に説明する。
元来、球状化元素としてのCaは、Mgに比べ高
温における蒸気圧が低い。即ち1500℃における
Mgの蒸気圧は11.7気圧に達するがCaの同じ温度
における蒸気圧は1.62気圧にすぎない。又溶湯中
のＳに対する親和力は、Caの方がMgより大き
い。
この事は、球状黒鉛鋳鉄を製造するのに大きな
影響があるのであつて、このためCaはMgにくら
べ黒鉛球状化能力は弱い。このCaがMgにくらべ
黒鉛球状化能力が弱いということは、かえつて適
量なCa添加量によつて、バーミキユラー黒鉛組
織を安定して得ることが比較的容易である。この
ため黒鉛球状化剤としてMgのみを用いる場合の
ように多量のTi等の阻害元素を添加させる必要
がないので、Ti等による溶湯の汚れを防ぐこと
が出来、又戻し材の管理も非常に容易である。
本発明の強靭鋳鉄は、前述の理由で鋳鉄にCa
を主として添加しこれに補助元素として、少量の
Mg，Ce族を活性化元素として、又Al，Biをバー
ミキユラー黒鉛安定化元素として添加し、鋳鉄中
のCa含有量を0.006％〜0.2％とし、これに補助元
素として、活性化元素としてのMg，Ce族、又は
両者を0.005％〜0.02％含有させ、これにバーミ
キユラー黒鉛安定化元素としてAlを0.002〜0.02
％又はBi0.001〜0.01％又はこの両者の合計0.002
％〜0.02％含有することを特徴とする強靭鋳鉄で
ある。
この場合の活性化元素のMgおよびまたはCe族
と、バーミキユラー黒鉛安定化元素であるAl，
Bi等の含有比率は、前者の２元素の合計を１重量
部とした場合、後者のAl，Biが0.3〜0.6重量部の
場合が最も安定したバーミキユラー黒鉛組織を作
る。
尚Ca，Ce族、Mgの上限以上の含有量でAl，Bi
の下限以下の含有量の場合は、黒鉛組織は球状黒
鉛が多くなり、又其の逆の場合は片状黒鉛となり
本発明の目的に沿わないので上記の数値に制限し
た。
又この本発明鋳鉄の機械的性質は抗張力３Kg
ｆ／mm2〜45Kgｆ／mm2伸び３〜12％を示すものであ
る。
次に本発明を実施例について説明する。
実施例
イ 実施条件
50Kg容量の高周波誘導電気炉にて、純鉄を主原
料とし、これに人造黒鉛電極、金属珪素を加え、
次の組成範囲の鋳鉄溶湯を溶製した。
Ｃ＝3.0％〜3.8％
Si＝1.5％〜2.2％
この溶湯に、第１表に示した組成のCa添加剤
を溶湯の重量比で0.3％、0.6％、1.0％、1.5％、
2.0％を添加し、これをCO2鋳型で作つたＹブロ
ツク鋳型に鋳込んだ。又同時に原子吸光分析試料
を石英管にて採取した。
The present invention relates to strong cast iron having a vermicular graphite structure. Vermicular graphite is an intermediate form of graphite between spheroidal graphite and flake graphite, and is also called caterpillar graphite, pseudospheroidal graphite, coralline graphite, or lumpy graphite, and is traditionally referred to as an incomplete state of spheroidal graphite. It was recognized that it was slightly mixed in the spheroidal graphite structure. The conventionally known strong cast iron having a vermicular graphite structure contains relatively large amounts of Ti and/or Zr as elements that inhibit spheroidization along with Mg, Ce group, etc., which are graphite spheroidizing elements contained in normal spheroidal graphite cast iron. In particular, it is cast iron in which the formation of spheroidal graphite is inhibited. This vermicular graphite cast iron has mechanical properties similar to those of spheroidal graphite cast iron, and its castability is close to that of flake graphite cast iron.In particular, there are fewer shrinkage cavities and the casting yield is much higher than that of spheroidal graphite cast iron. is in good condition. In addition, vibration absorption, thermal conductivity, wear resistance,
Fatigue properties are better than spheroidal graphite cast iron, vibration absorption,
Thermal conductivity is a new field of cast iron with properties similar to flake graphite cast iron. However, conventional cast iron with a vermicular graphite structure has a very narrow allowable range for the content of Mg, Ti, and Zr, and if the composition of these elements is slightly deviated, cast iron with a vermicular graphite structure cannot be obtained. The present invention is a strong cast iron having a new composition that eliminates the drawback that conventional cast iron having a vermicular graphite structure is extremely difficult to manufacture due to its composition, and also having a stable vermicular graphite structure. The purpose is to provide Ca, an element with relatively weak graphite spheroidizing ability.
In addition to the above, a small amount of Mg and/or Ce group, which has a relatively strong graphite nodulation ability, is contained, and Al and/or Bi is added.
The present invention relates to strong cast iron having a vermicular graphite structure containing as a vermicular graphite stabilizing element. Next, the present invention will be explained in detail. Originally, Ca as a spheroidizing element has a lower vapor pressure at high temperatures than Mg. i.e. at 1500℃
The vapor pressure of Mg reaches 11.7 atm, but the vapor pressure of Ca at the same temperature is only 1.62 atm. Also, Ca has a greater affinity for S in the molten metal than Mg. This has a great influence on the production of spheroidal graphite cast iron, and for this reason, Ca has a weaker graphite spheroidizing ability than Mg. The fact that Ca has a weaker graphite spheroidizing ability than Mg means that it is relatively easy to stably obtain a vermicular graphite structure by adding an appropriate amount of Ca. For this reason, there is no need to add a large amount of inhibiting elements such as Ti, unlike when using only Mg as a graphite nodularizing agent, so it is possible to prevent the molten metal from being contaminated by Ti, etc., and the management of the return material is also very easy. It's easy. The strong cast iron of the present invention has Ca
is mainly added, and a small amount of it is added as an auxiliary element.
Mg and Ce group are added as activating elements, and Al and Bi are added as vermicular graphite stabilizing elements to adjust the Ca content in cast iron to 0.006% to 0.2%. , Ce group, or both at 0.005% to 0.02%, and 0.002 to 0.02% Al as a vermicular graphite stabilizing element.
% or Bi0.001~0.01% or the total of both 0.002
It is a strong cast iron characterized by containing 0.02% to 0.02%. In this case, the activating element Mg and or Ce group and the vermicular graphite stabilizing element Al,
Regarding the content ratio of Bi, etc., when the sum of the former two elements is 1 part by weight, the most stable vermicular graphite structure is created when the latter, Al and Bi, are 0.3 to 0.6 parts by weight. In addition, if the content exceeds the upper limit of Ca, Ce group, and Mg, Al, Bi
If the content is below the lower limit, the graphite structure will consist of a large amount of spheroidal graphite, and vice versa, the graphite structure will become flaky graphite, which does not meet the purpose of the present invention, so the above values were used. In addition, the mechanical properties of the cast iron of the present invention include a tensile strength of 3 kg.
f/mm 2 to 45 kgf/mm 2 It shows an elongation of 3 to 12%. Next, the present invention will be explained with reference to examples. Example A Implementation conditions In a high-frequency induction electric furnace with a capacity of 50 kg, pure iron was used as the main raw material, and artificial graphite electrodes and metallic silicon were added to it.
Molten cast iron with the following composition range was produced. C = 3.0% to 3.8% Si = 1.5% to 2.2% Ca additives having the composition shown in Table 1 were added to this molten metal at a weight ratio of 0.3%, 0.6%, 1.0%, 1.5%,
2.0% was added and cast into a Y block mold made with a CO 2 mold. At the same time, a sample for atomic absorption analysis was collected using a quartz tube.
【表】
このCa添加剤中のCaは、Ca−Si，Ce族は、塩
化物、弗化物、Mgは塩化物、弗化物、Mg−Si合
金、Alは塩化物、弗化物、金属粉、Biは金属、
酸化物、酸塩化物の形で配合され、又Caの空気
中における消耗を防ぐためCaCl2等のフラツクス
を使用してある。
この添加剤を各々秤量し、前述の高周波誘導炉
で溶製された鋳鉄溶湯50Kgを各々10Kg宛分湯しこ
れに前述の各添加％添加しＹブロツクに鋳込ん
だ。
このＹブロツクより試料を採取し顕微鏡組織，
化学成分を調べ又このＹブロツクより採取した
JIS4号試験片から機械的性質（抗張力、伸び）を
試験した。
化学成分中Ｃ，Siは通常の化学分析により試験
し、又Ca，Mg，Ce族，Al，Biは別に採取した試
料により原子吸光分析により定量した。
ロ 実施結果
前述の実施例による結果は次の第２表に示し
た。[Table] Ca in this Ca additive is Ca-Si, Ce group is chloride, fluoride, Mg is chloride, fluoride, Mg-Si alloy, Al is chloride, fluoride, metal powder, Bi is metal,
It is formulated in the form of oxides and acid chlorides, and fluxes such as CaCl 2 are used to prevent Ca from being consumed in the air. Each of these additives was weighed, 50 kg of molten cast iron melted in the above-mentioned high-frequency induction furnace was divided into 10 kg of each, and each of the above-mentioned addition percentages was added to the molten metal and cast into a Y block. A sample was collected from this Y block and its microscopic structure was examined.
The chemical components were investigated and collected from this Y block.
Mechanical properties (tensile strength, elongation) were tested using JIS No. 4 test pieces. Among the chemical components, C and Si were tested by conventional chemical analysis, and Ca, Mg, Ce group, Al, and Bi were determined by atomic absorption spectrometry using separately collected samples. B. Results of implementation The results of the above-mentioned examples are shown in Table 2 below.
【表】【table】
【表】
尚第１図に示したバーミキユラー黒鉛組織は実
施例のNo.43のものを代表的な例として示した。第
２図は、同じ組織の400倍に拡大したものであ
る。
以上の実施結果に見られるように本発明の
Ca，Mg，Ce族，Al，Biの含有を示す鋳鉄は明ら
かにバーミキユラー黒鉛組織で抗張力32Kgｆ／mm2
〜45Kgｆ／mm2である。[Table] The vermicular graphite structure shown in FIG. 1 is shown as Example No. 43 as a representative example. Figure 2 shows the same tissue magnified 400 times. As seen in the above implementation results, the present invention
Cast iron containing Ca, Mg, Ce group, Al, and Bi clearly has a vermicular graphite structure with a tensile strength of 32 Kgf/mm 2
~45Kgf/ mm2 .
第１，２図はそれぞれ本発明のバーミキユラー
黒鉛組織を有する強靭鋳鉄の倍率100倍、400倍の
顕微鏡写真である。
Figures 1 and 2 are micrographs at 100x and 400x magnification, respectively, of strong cast iron having a vermicular graphite structure according to the present invention.
Claims (1)
0.006〜0.2％、セリウム族元素、マグネシウムの
うちから選ばれる何れか少なくとも１種0.005〜
0.02％、アルミニウム、ビスマスのうちから選ば
れる何れか少なくとも１種アルミニウムにあつて
は0.002〜0.02％、ビスマスにあつては0.001〜
0.01％合計量では0.002〜0.02％を含有することを
特徴とするバーミキユラー黒鉛組織を有する強靭
鋳鉄。1 Carbon 2.5-4.5%, Silicon 1-4.5%, Calcium
0.006~0.2%, at least one selected from cerium group elements, magnesium 0.005~
0.02%, at least one selected from aluminum and bismuth, 0.002 to 0.02% for aluminum, 0.001 to 0.001 for bismuth
Strong cast iron having a vermicular graphite structure containing 0.002 to 0.02% in total amount of 0.01%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11798978A JPS5544560A (en) | 1978-09-27 | 1978-09-27 | Tough cast iron having vermicular graphite structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11798978A JPS5544560A (en) | 1978-09-27 | 1978-09-27 | Tough cast iron having vermicular graphite structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5544560A JPS5544560A (en) | 1980-03-28 |
| JPS625982B2 true JPS625982B2 (en) | 1987-02-07 |
Family
ID=14725260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11798978A Granted JPS5544560A (en) | 1978-09-27 | 1978-09-27 | Tough cast iron having vermicular graphite structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5544560A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5893854A (en) * | 1981-11-30 | 1983-06-03 | Mitsubishi Motors Corp | Exhaust manifold |
| JPS58184320A (en) * | 1982-04-23 | 1983-10-27 | Komatsu Ltd | Manufacturing of part liable to be frictionally worn |
| JPS61210891A (en) * | 1985-03-14 | 1986-09-19 | Shinko Electric Co Ltd | Controlling method for underwater motor |
| DE3807455C2 (en) * | 1987-03-09 | 1996-11-07 | Hitachi Metals Ltd | Nodular cast iron with high impact strength and method for its treatment |
| SE520028C2 (en) | 1998-07-03 | 2003-05-13 | Sintercast Ab | Process for the preparation of compact graphite iron alloy, this article, and the use of compact graphite alloy |
-
1978
- 1978-09-27 JP JP11798978A patent/JPS5544560A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5544560A (en) | 1980-03-28 |
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