JPH01245A - Spheroidal graphite cast iron - Google Patents
Spheroidal graphite cast ironInfo
- Publication number
- JPH01245A JPH01245A JP62-323812A JP32381287A JPH01245A JP H01245 A JPH01245 A JP H01245A JP 32381287 A JP32381287 A JP 32381287A JP H01245 A JPH01245 A JP H01245A
- Authority
- JP
- Japan
- Prior art keywords
- elongation
- impact value
- cast iron
- spheroidal graphite
- graphite cast
- 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
- 229910001141 Ductile iron Inorganic materials 0.000 title claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 16
- 229910002804 graphite Inorganic materials 0.000 claims description 16
- 239000010439 graphite Substances 0.000 claims description 16
- 229910052759 nickel Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 229910052797 bismuth Inorganic materials 0.000 claims 1
- 239000000463 material Substances 0.000 description 40
- 230000007423 decrease Effects 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 9
- 229910001562 pearlite Inorganic materials 0.000 description 8
- 229910000859 α-Fe Inorganic materials 0.000 description 8
- 238000000137 annealing Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 150000001247 metal acetylides Chemical class 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 235000011835 quiches Nutrition 0.000 description 2
- 101150013553 CD40 gene Proteins 0.000 description 1
- 102100040245 Tumor necrosis factor receptor superfamily member 5 Human genes 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】 ［産業上の利用分野） 本発明は高靭性の球状黒鉛鋳鉄に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to high toughness spheroidal graphite cast iron.
〔従来技術及び発明が解決しようとする問題点〕従来の
フェライト地を有する球状黒鉛鋳鉄ＦＣＤ３７又はＦｃ
Ｄ４（１、伸び、衝撃ｍハａｘいが、引張強ざが低く、
パーライト地ＣあるＦＣ０５０又はＦＣＤ６０では引張
強さや耐力は高いが伸びや＊＊値、特に低温での衝撃値
が低い。[Prior art and problems to be solved by the invention] Conventional spheroidal graphite cast iron FCD37 or Fc with ferrite base
D4 (1, elongation, impact m ax is high, but tensile strength is low,
Pearlite base C, FC050 or FCD60, has high tensile strength and yield strength, but low elongation, ** value, and particularly low impact value at low temperatures.
これらを改善する為にＮｉを添加する方法が特公昭６１
−３３８９７号公報等によって開示されている。この発
明ではＳｉが２．０％以上であるため、−１５℃で最低
１ 、７ ｋｏｆ−ｍ／ｃａｉ２のｆｉｒ撃値しか得ら
れない。In order to improve these problems, a method of adding Ni was proposed in 1983.
This is disclosed in Japanese Patent No.-33897 and the like. In this invention, since the Si content is 2.0% or more, a minimum firing value of 1.7 kof-m/cai2 can be obtained at -15°C.
自動車用や産業用鋳物部品は最近さらに強靭性を要求さ
れかつ一４０℃程度の低温下でも使用されることが多く
、このような低温でも高い衝撃値が要求されるようにな
った。Cast parts for automobiles and industrial use have recently been required to have even greater toughness and are often used at temperatures as low as -40°C, and high impact values are now required even at such low temperatures.
そこで本発明者等は、Ｎｉを添加することにより引張強
さと耐力を向上させ、Ｓｉ含有聞を低くすることにより
伸びとｖｊ撃値を向上させた。Therefore, the present inventors improved the tensile strength and yield strength by adding Ni, and improved the elongation and vj impact value by lowering the Si content.
また上記発明ではフェライト組織であることを条件とし
実施例ではフェライト化焼なましを行なっているが、製
造原価を低減する意味では焼４【ましを行なわず、鋳放
し状態で使用することが最も好ましい。In addition, in the above invention, the condition is that the structure is ferritic, and in the embodiment, annealing is performed to make it ferrite, but in order to reduce manufacturing costs, it is best to use it in an as-cast state without performing annealing. preferable.
そこで、微量の３ｉを添加づることにより黒鉛粒数を３
００ケ／−１２以上にすることによって、パーライトを
減少さＵ、熱処理をしなくても、又は熱処理をするとし
ても低温でかつ短時間の熱処理で充分な伸びと衝撃値を
確保し得ることを知見し本発明を完成するに至ったもの
である。Therefore, by adding a small amount of 3i, the number of graphite particles was increased to 3.
00/-12 or more, it is possible to reduce pearlite and ensure sufficient elongation and impact value without heat treatment or even with heat treatment at a low temperature and for a short time. These findings led to the completion of the present invention.
もちろん焼なましを行なってフェライト組織にすれば、
更に高い伸びや靭性が得られることはいうまでもない。Of course, if annealing is performed to create a ferrite structure,
Needless to say, even higher elongation and toughness can be obtained.
本発明目的は、伸びと衝撃値、特に低温での衝撃値を向
上せしめ、また必要に応じて３ｉを添加することにより
熱処理を省くか、行っても低温でかつ短時間の熱処理を
行うのみで製造原価を低減し得る球状黒鉛鋳鉄を提供す
るものである。The purpose of the present invention is to improve the elongation and impact value, especially the impact value at low temperatures, and if necessary, by adding 3i, heat treatment can be omitted, or even if heat treatment is performed, it can be done only at low temperature and for a short time. The present invention provides spheroidal graphite cast iron that can reduce manufacturing costs.
本発明の状黒鉛ｖＩ鉄は、
重け％でＣ：３．Ｏ〜４．０ ％
Ｓｉ：１．５ 〜２．３ ％
Ｍｎ： ＜０．３ ％
Ｐ ： ＜０．０３％
Ｎｉ：０．５ 〜２．０ ％
Ｃｒ： ＜０．１０％
ＭＯ：０．０２〜０．０６％
残余鉄及び不可避的不純物からなり、かつＧＥ値が３．
９〜４．６％の溶湯を用いるか、必要に応じて上記組成
の溶湯に０．００５〜０．０３％の３ｉを添加し、該Ｂ
ｉ添加と同時に又は添加後に接種を行ない、黒鉛粒数を
３００ケ／ｍｍ２以上とし、且つ３ｉの残留含有量を０
．００１５〜０．０１５％としたことを特徴とするもの
である。The graphite VI iron of the present invention has a weight percentage of C: 3. O ~ 4.0% Si: 1.5 ~ 2.3% Mn: <0.3% P: <0.03% Ni: 0.5 ~ 2.0% Cr: <0.10% MO: 0 .02~0.06% Consists of residual iron and unavoidable impurities, and has a GE value of 3.
Use 9-4.6% of molten metal, or add 0.005-0.03% of 3i to the molten metal of the above composition as necessary, and
Inoculation is carried out at the same time as or after the addition of i, so that the number of graphite particles is 300 particles/mm2 or more, and the residual content of 3i is 0.
．． 0015 to 0.015%.
次に、前記数値の限定理由について説明する。Next, the reason for limiting the above numerical values will be explained.
Ｃは３．０％未満では鋳造性が悪くなり、かつ黒鉛粒数
が減少するためパーライトが多くなる。If C is less than 3.0%, castability deteriorates and the number of graphite grains decreases, resulting in an increase in pearlite.
また４、０％を超えるとキッシュ黒鉛が出やすくなり強
度が低下する。Moreover, if it exceeds 4.0%, Quiche graphite tends to come out and the strength decreases.
Ｓｉは１．５％未満では炭化物が析出しやすくなり衝撃
値と伸びが低下する。また２、３％を超えるとシリコフ
ェライトの影響で衝撃値や伸びが低下する。If Si is less than 1.5%, carbides tend to precipitate, resulting in a decrease in impact value and elongation. Moreover, if it exceeds 2 to 3%, the impact value and elongation will decrease due to the influence of silicoferrite.
Ｍｎが０．３％を超えるとパーライトが多くなりｌ’ｌ
値と伸びが低下する。When Mn exceeds 0.3%, pearlite increases.
Value and elongation decrease.
Ｐは０．０３％を超えるとステダイトの影響で衝撃値と
伸びが低下する。When P exceeds 0.03%, the impact value and elongation decrease due to the influence of steadite.
Ｎｉは０．５％未満ではＮｉの効果がなく強度が得られ
ない。また２、０％を超えるとパーライトが多くなり衝
撃値や伸びが低下する。If Ni is less than 0.5%, it has no effect and strength cannot be obtained. Moreover, if it exceeds 2.0%, the amount of pearlite increases and the impact value and elongation decrease.
ｃｒが０．１％を超えると炭化物が析出しやすくなり衝
撃値と伸びが低下する。When cr exceeds 0.1%, carbides tend to precipitate, resulting in a decrease in impact value and elongation.
ＭＱは０．０２％未満では黒鉛が球状化せず、０．０６
％を超えると、ひけ巣、炭化物が出やすくなるばかりで
なく、経済的にも不利となる。If MQ is less than 0.02%, graphite will not become spheroidized and will be 0.06%.
If it exceeds %, not only will shrinkage cavities and carbides be more likely to appear, but it will also be economically disadvantageous.
ＧＥ値は３．９％未満では炭化物が出やすくなり、また
鋳造性も悪くなる。４．６％を超えるとキッシュ黒鉛が
出やすくなる。If the GE value is less than 3.9%, carbides tend to appear and castability deteriorates. If it exceeds 4.6%, quiche graphite tends to appear.
３ｉはその残留含有量が０．００１５％未満では黒鉛粒
数増大効果が低下し、そのため鋳放し組織中にせメンタ
イトが発生するようになる。When the residual content of 3i is less than 0.0015%, the effect of increasing the number of graphite grains decreases, and as a result, cementite is generated in the as-cast structure.
また残留含有量が０．０１５０％を超えると１３ｉの黒
鉛球状化阻害効果が現出し、黒鉛の球状化率が７０％以
下となって機械的諸性質が劣化する。If the residual content exceeds 0.0150%, the graphite spheroidization inhibiting effect of 13i appears, the graphite spheroidization rate becomes 70% or less, and mechanical properties deteriorate.
１３ｉは球状黒鉛鋳鉄ＷｊＳに対する溶は込み歩留まり
率が悪く、しかも変動も大きいため、その残留含有量を
０．００１５〜０．０１５０％にするためには添加間と
して０．００５〜０．０３０％に設定する必要がある。13i has a poor melt penetration yield rate for spheroidal graphite cast iron WjS and also has large fluctuations, so in order to make its residual content 0.0015 to 0.0150%, the addition interval should be 0.005 to 0.030%. It is necessary to set it to .
黒鉛粒数は、３００ケ／ １ｍ２未満では、黒鉛間距離
が大きくなりパーライトの析出が多くなって衝撃値、伸
びが低下する。If the number of graphite particles is less than 300 particles/1 m2, the distance between graphite particles becomes large, pearlite precipitation increases, and the impact value and elongation decrease.
本発明は、引張強さ、耐力が高く、かつ伸び、衝撃値、
特に−４０℃での衝撃値の高い球状黒鉛鋳鉄が鋳放しで
も得ることができる。The present invention has high tensile strength and yield strength, as well as elongation, impact value,
In particular, spheroidal graphite cast iron having a high impact value at -40° C. can also be obtained as-cast.
またフェライト化焼なまし熱処理を行なえば、更に高い
衝撃値、伸びが得られる。Further, if ferrite annealing heat treatment is performed, even higher impact value and elongation can be obtained.
〔実施例、１〕
２）鋳型
２５ｒＡｌ厚さＸ２５０１１１１長さのＹブロックの鋳
型をＣＯ２鋳型で造型した。[Example 1] 2) Mold 25rA Y block mold with Al thickness x 2501111 length was molded using a CO2 mold.
３）結 果
上記鋳型に溶湯を注入して作成したテストピースについ
ての調査結果を以下に記す。3) Results The results of the investigation on test pieces made by pouring molten metal into the molds described above are described below.
第１図（ａ）、（ｂ）、（ｃ）、（ｄ）、（ｅ）に顕微
鏡組織を示す。本発明材は第１図（ａ）。Microscopic structures are shown in FIGS. 1(a), (b), (c), (d), and (e). The material of the present invention is shown in FIG. 1(a).
（ｂ）、（ｃ）に示ずようにＮｉの添加によりパーライ
ト量は増加してゆく。なお、第１図（ｄ）。As shown in (b) and (c), the amount of pearlite increases with the addition of Ni. In addition, FIG. 1(d).
（０）はそれぞれ従来材ＦＣＤ４０．ＦＣＤ６０を示寸
すのである。(0) is the conventional material FCD40. It indicates the size of FCD60.
第２図、第３図に機械的性質を示１が、本発明の０．５
３％Ｎｉ材は引張強さ、耐力はＦＣＤ４０に較べてやや
劣るものの、伸び、衝撃値は高い値を示している。Figures 2 and 3 show the mechanical properties.
Although the 3% Ni material is slightly inferior to FCD40 in tensile strength and yield strength, it exhibits high elongation and impact values.
また本発明の１．０５％Ｎｉ材は引張強さ、耐力、伸び
ともＦＣＤ４０材よりやや高く、衝撃値は改善されてい
る。勿論ＦＣＤ６０材に較べるとやはり数倍の伸びと衝
撃値を示している。Furthermore, the 1.05% Ni material of the present invention has slightly higher tensile strength, yield strength, and elongation than the FCD40 material, and has improved impact value. Of course, compared to FCD60 material, it still shows several times the elongation and impact value.
本発明の１．９８％Ｎｉ材はＦＣＤ４０ｔＪに較べ引張
強さは優れ、伸びと衝撃値はやや低い程度である。また
、ＦＣＤ６０ｔ４に較べると引張強さ、耐力はやや低い
が、伸び、！Ｉ撃値は優れている。The 1.98% Ni material of the present invention has superior tensile strength and slightly lower elongation and impact value than FCD40tJ. Also, compared to FCD60t4, the tensile strength and yield strength are slightly lower, but the elongation! The I hit value is excellent.
このように本発明材は、従来の材質に較べて極めて優れ
た材質であることがわかる。Thus, it can be seen that the material of the present invention is an extremely superior material compared to conventional materials.
〔実施例、２〕 １）化学成分 〔実施例、１〕と同じ。[Example, 2] 1) Chemical components Same as [Example 1].
２）熱処理
〔実施例、１〕で得られた素材（除ＦＣＤ６０）を次の
熱処理サイクルにてフェライト化焼なましを行った。2) The material obtained in heat treatment [Example 1] (FCD 60 removed) was annealed to ferrite in the next heat treatment cycle.
９００℃×２時間→７２０℃×２時間→炉冷３）結果
第４図（ａ）、（ｂ）、（ｃ）、（ｄ）は顕微鏡組織を
示すものである。本発明材は第４図（ａ）（ｂ）、（Ｃ
）に示すようにＮｉの添加量を増加し１．９８％まで含
有しても完全にフェライト化されている。なお、第４図
（ｄ）は従来材ＦＣＣ４０（熱処理材）を示すものであ
る。また熱処理を接したものの機械的性質を第５図、第
６図に示す。900°C x 2 hours → 720°C x 2 hours → Furnace cooling 3) Results Figures 4 (a), (b), (c) and (d) show the microscopic structure. The materials of the present invention are shown in Figures 4(a)(b) and (C).
), even if the amount of Ni added was increased to 1.98%, complete ferrite formation was achieved. Note that FIG. 4(d) shows a conventional material FCC40 (heat treated material). Further, the mechanical properties of the heat treated material are shown in FIGS. 5 and 6.
０．５３％Ｎｉ材は引張強さ、耐りはＦＣＤ４０熱処理
材と同程度であるが、伸び、衝撃値は著しく改善される
。特に低温（−４０℃）での衝′！Ｊ値が改善される。The tensile strength and durability of the 0.53% Ni material are comparable to those of the FCD40 heat-treated material, but the elongation and impact value are significantly improved. Especially at low temperatures (-40℃)! The J value is improved.
１．０５％Ｎｉ材では引張強さ、耐力は優れており伸び
、Ｉｉ撃値もやや優れている。特に低温衝撃値が改善さ
れる。The 1.05% Ni material has excellent tensile strength and yield strength, elongation, and somewhat excellent Ii impact value. In particular, the low temperature impact value is improved.
１．９８％Ｎｉ材では伸び、衝撃値はやや低ｙするが引
張強さ、耐力が苔しく改善される。The 1.98% Ni material elongates and the impact value is slightly low, but the tensile strength and yield strength are significantly improved.
〔実施例、３〕
１）化学成分
（ｗｔ％）２）鋳、型
２５ａ＋ｍ厚さＸ２５０ｍｍ長さのＹブロックの鋳型を
ＣＯ２鋳型で造型した。[Example, 3] 1) Chemical components
(wt%) 2) Casting: A Y block mold with a thickness of 25a+m and a length of 250 mm was produced using a CO2 mold.
３）結 果
上記鋳型に溶湯を注入して作成したテストピースについ
ての調査結果を以下に記す。3) Results The results of the investigation on test pieces made by pouring molten metal into the molds described above are described below.
第７図（ａ）、（ｂ）、（ｃ）に顕微鏡組織を示す。本
発明材は第７図（ａ＞、（ｂ）、（ｃ）に示すようにＮ
ｉの添加により、パーライト母は増加してゆく。またＦ
ＣＤ４０、ＦＣＤ６０は黒鉛粒数が本発明材に較べて少
ない。これは本発明材が３ｉを添加しているため黒鉛粒
数が多くなっている。Microscopic structures are shown in FIGS. 7(a), (b), and (c). As shown in Fig. 7 (a>, (b), (c)), the material of the present invention is
By adding i, the pearlite matrix increases. Also F
CD40 and FCD60 have fewer graphite grains than the materials of the present invention. This is because the material of the present invention has a large number of graphite grains due to the addition of 3i.
第８図、第９図に機械的性質を示すが、本発明の０．５
１％Ｎｉ材は引張強さ、耐力はＦＣＤ４０に較べて多少
劣るものの、伸び、Ｉｉｉ撃値はきわめて高い値を示し
ている。Mechanical properties are shown in FIGS. 8 and 9, and the 0.5
Although the 1% Ni material is somewhat inferior to FCD40 in tensile strength and yield strength, it exhibits extremely high elongation and III impact values.
また本発明の１．０３％Ｎｉ材は引張強さ、耐力、伸び
ともＦＣＤ４０材とほぼ同等であるが、衝撃値は著しく
改善されている。勿論ＦＣＤ６０材に較べるとやはり数
倍の伸びと１ｉｆｆ’値を示している。Further, the 1.03% Ni material of the present invention has almost the same tensile strength, yield strength, and elongation as the FCD40 material, but its impact value is significantly improved. Of course, compared to FCD60 material, it still shows several times the elongation and 1iff' value.
本発明の２．００％ｌ’Ｊｉ材はＦＣＤ４０材に較べ引
張強さは優れ、伸びは多少劣るもののｔγ値はほぼ同等
である。またＦＣ０６０材に較らべると引張強さ、耐力
はやや低いが、伸び、Ｉｊ撃値は優れている。The 2.00% l'Ji material of the present invention has superior tensile strength and almost the same tγ value as the FCD40 material, although its elongation is somewhat inferior. Also, compared to FC060 material, the tensile strength and yield strength are slightly lower, but the elongation and Ij impact value are superior.
このように本発明材は、従来の材質に較べて極めて優れ
た材質であることがわかる。Thus, it can be seen that the material of the present invention is an extremely superior material compared to conventional materials.
（実施例、４） １）化学成分 〔実施例、３〕と同じ。(Example, 4) 1) Chemical components Same as [Example 3].
２）熱処理
〔実施例、３〕で得られた糸ｔＪ（除ＦＣＤ６０）を次
の熱処理サイクルにてフェライト化焼なましを行った。2) The yarn tJ (excluding FCD of 60) obtained in heat treatment [Example 3] was annealed to form ferrite in the next heat treatment cycle.
９００℃×２時間→７２０℃×２時間→炉冷３）結 果
第１０図（ａ）、（ｂ）、（Ｃ）は顕微鏡組織を示すも
のぐある。本発明材は第１０図（ａ）。900°C x 2 hours → 720°C x 2 hours → Furnace cooling 3) Results Figures 10 (a), (b), and (C) show the microscopic structure. The material of the present invention is shown in FIG. 10(a).
（ｂ）、（Ｃ）に示すようにＮｉの添加囚を増加し２．
０％まで含有しても完全にフェライト化されている。ま
た熱処理をほどこしたものにおいても、本発明材の黒鉛
粒数はＦＣＤ４０熱処理材よりも多いことが明らかであ
る。As shown in (b) and (C), the amount of Ni added was increased.2.
Even if the content is up to 0%, ferrite is completely formed. Furthermore, even in the heat-treated material, it is clear that the number of graphite grains in the material of the present invention is greater than that in the FCD40 heat-treated material.
第１１図、第１２図に機械的性質を示す。Mechanical properties are shown in FIGS. 11 and 12.
０．５１％Ｎｉ材は引張強さ、耐力はＦＣＣ４０熱処理
材と同程度であるが、伸び、衝撃値は著しく改善される
。特に低温（−４０℃）での衝撃値が改善される。The tensile strength and yield strength of the 0.51% Ni material are comparable to those of the FCC40 heat-treated material, but the elongation and impact value are significantly improved. In particular, the impact value at low temperatures (-40°C) is improved.
２６００％Ｎｉ材では伸び、衝撃値はやや低ドするが引
張強さ、耐力が著しく改善される。The 2600% Ni material has a slightly lower elongation and impact value, but its tensile strength and yield strength are significantly improved.
以上の説明で明らかなように、本発明の球状黒鉛鋳鉄は
、眞述のとおり鋳放し状Ｂで優れた引張強さ、伸び及び
衝撃値を有するものであるが、熱処理を施すと鋳放し材
に較べ、更に優れた伸び、衝撃値、特に低湿での衝撃値
が改善される。As is clear from the above explanation, the spheroidal graphite cast iron of the present invention has excellent tensile strength, elongation, and impact value in the as-cast state B, as stated above, but when heat treated, it becomes as-cast. Compared to the above, it has better elongation and impact value, especially improved impact value at low humidity.
すなわち、球状黒鉛鋳鉄の機械的性質の向上と製造原価
の低減に著しい効果をもたらすものである。That is, it brings about a remarkable effect in improving the mechanical properties of spheroidal graphite cast iron and reducing manufacturing costs.
第１図（ａ）、（ｂ）、（ｃ）、（ｄ）。
（ｅ）、第４図（ａ）、（ｂ）、（ｃ）、（ｄ）、第７
図（ａ）、（ｂ）、（ｃ）、第１０図（ａ）。
（ｂ）（Ｃ）はともに金属顕微鏡組織写真、第２．３．
５．６．８．９．１１．１２図はともに機械的性質を示
づものである。
特許出願人 日立金属株式会社
（ａ）
ｋ、駈φ９μ
×１（川
第 １ 図
（ｂ’） ” 、、
（ｃ）（ｄ〕
貌ｆ ｇｆ 城を灯第３図
ＮＬ ＮＬ ＮＬ
第５図
第６図
従来材
（Ｃ，）
／Ｃ１＋４（１
×！００
第８図
第９図
ＮＬ ＮＬ ＮＬ
第１０図
（ａ） ’ （ｂ）？
〕・′５：ン・・ｒ匂１．Ｑ；（％ト言２、、、：Ｏｊ
）％Ｎ）
第１１図
第１２図Figure 1 (a), (b), (c), (d). (e), Figure 4 (a), (b), (c), (d), Figure 7
Figures (a), (b), (c), and Figure 10 (a). (b) and (C) are both metal micrographs, No. 2.3.
5.6.8.9.11.12 Both figures show mechanical properties. Patent applicant: Hitachi Metals, Ltd. (a) k, φ9μ × 1 (Fig. 1 (b')
(c) (d) Appearance f gf Lighting the castle Fig. 3 NL NL NL Fig. 5 Fig. 6 Conventional material (C,) /C1+4 (1 ×!00 Fig. 8 Fig. 9 NL NL NL Fig. 10 ( a) ' (b)?
]・'5: N...r smell 1. Q;(%Top word 2,,,:Oj
)%N) Figure 11 Figure 12
Claims (3)
を添加し、該Ｂｉ添加と同時に又は添加後に接種を行な
い、黒鉛粒数を３００ケ／ｍｍ＾２以上とした特許請求
の範囲第１項記載の球状黒鉛鋳鉄。(2) 0.005 to 0.03% Bi in the molten metal with the above composition
The spheroidal graphite cast iron according to claim 1, wherein the spheroidal graphite cast iron is inoculated at the same time or after the addition of Bi, and the number of graphite grains is 300 particles/mm^2 or more.
た特許請求の範囲第１項又は第２項記載の球状黒鉛鋳鉄
。(3) Spheroidal graphite cast iron according to claim 1 or 2, wherein the Bi content is 0.0015 to 0.015%.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62323812A JP2716063B2 (en) | 1987-03-09 | 1987-12-23 | Spheroidal graphite cast iron with excellent low temperature toughness |
| GB8805483A GB2203448B (en) | 1987-03-09 | 1988-03-08 | Nodular cast iron |
| DE3807455A DE3807455C2 (en) | 1987-03-09 | 1988-03-08 | Nodular cast iron with high impact strength and method for its treatment |
| US07/165,873 US4889687A (en) | 1987-03-09 | 1988-03-09 | Nodular cast iron having a high impact strength and process of treating the same |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5220587 | 1987-03-09 | ||
| JP62-52205 | 1987-03-09 | ||
| JP62323812A JP2716063B2 (en) | 1987-03-09 | 1987-12-23 | Spheroidal graphite cast iron with excellent low temperature toughness |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JPS64245A JPS64245A (en) | 1989-01-05 |
| JPH01245A true JPH01245A (en) | 1989-01-05 |
| JP2716063B2 JP2716063B2 (en) | 1998-02-18 |
Family
ID=26392817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62323812A Expired - Fee Related JP2716063B2 (en) | 1987-03-09 | 1987-12-23 | Spheroidal graphite cast iron with excellent low temperature toughness |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2716063B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2730959B2 (en) * | 1988-03-09 | 1998-03-25 | 日立金属株式会社 | Spheroidal graphite cast iron and method for producing the same |
| JPH06116677A (en) * | 1992-10-06 | 1994-04-26 | Nippon Steel Corp | Ductile cast iron material excellent in tenacity and surface roughening resistance |
| EP1225239A4 (en) * | 1999-06-08 | 2002-09-11 | Asahi Tec Corp | Non-austempered spheroidal graphite cast iron |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5917183B2 (en) * | 1977-02-09 | 1984-04-19 | 日立金属株式会社 | As-cast pearlite terrestrial graphite cast iron |
-
1987
- 1987-12-23 JP JP62323812A patent/JP2716063B2/en not_active Expired - Fee Related
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