JP5506973B1 - Spheroidal graphite cast iron and method for producing the same - Google Patents
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- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 229910052802 copper Inorganic materials 0.000 claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000005266 casting Methods 0.000 claims description 15
- 238000011081 inoculation Methods 0.000 claims description 15
- 238000000137 annealing Methods 0.000 claims description 8
- 239000002054 inoculum Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 238000007710 freezing Methods 0.000 claims description 2
- 230000008014 freezing Effects 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 abstract description 4
- 229910052804 chromium Inorganic materials 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 15
- 239000010949 copper Substances 0.000 description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 229910002804 graphite Inorganic materials 0.000 description 7
- 239000010439 graphite Substances 0.000 description 7
- 229910000859 α-Fe Inorganic materials 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 239000011651 chromium Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 239000011572 manganese Substances 0.000 description 5
- 238000010248 power generation Methods 0.000 description 5
- 229910001018 Cast iron Inorganic materials 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 229910000796 S alloy Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- QENHCSSJTJWZAL-UHFFFAOYSA-N magnesium sulfide Chemical compound [Mg+2].[S-2] QENHCSSJTJWZAL-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910007981 Si-Mg Inorganic materials 0.000 description 1
- 229910008316 Si—Mg Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
Abstract
【課題】良好な機械的性質および優れた低温靭性を確保しつつ、大幅にコストを低減し得る球状黒鉛鋳鉄およびその製造方法を提供する。
【解決手段】Ｃを３．５〜４．０質量％、Ｓｉを１．７〜２．３質量％、Ｍｎを０．２質量％未満、Ｃｒを０．１質量％未満、Ｍｇを０．０４〜０．０６質量％、ＣｕおよびＳ、並びにその他不可避的不純物を含有して、残部がＦｅからなり、氷点下で使用される球状黒鉛鋳鉄であって、上記Ｃｕを０．１０〜０．２０質量％、上記Ｓを０．０１〜０．０２質量％含有する。
【選択図】なしAn object of the present invention is to provide a spheroidal graphite cast iron capable of drastically reducing costs while ensuring good mechanical properties and excellent low temperature toughness, and a method for producing the same.
A C of 3.5 to 4.0 mass%, the Si 1.7 to 2.3 mass%, less than 0.2 mass% of Mn, Cr, less than 0.1 wt%, a M g 0 .04～0.06 mass%, Cu and S, as well as contain other unavoidable impurities, the balance being Fe, a spheroidal graphite cast iron to be used in sub-zero, the Cu from 0.10 to 0. 20 wt%, contains the S 0.01 to 0.02 wt%.
[Selection figure] None
Description
本発明は、低温靭性に優れた球状黒鉛鋳鉄およびその製造方法に関するものである。 The present invention relates to a spheroidal graphite cast iron excellent in low temperature toughness and a method for producing the same.
近年、電力供給設備として、燃料の枯渇が心配される石油や原子力を利用するものから、環境にも優しく再生可能な自然エネルギー（風力、太陽光など）を利用するものへの転換が図られている。特に風力発電設備は、発電コストが低く、工期が短いので、世界的に普及しつつある。また、我が国において、風力発電関連は、国家レベルでの重点化技術であり、さらなる開発が望まれている。 In recent years, there has been a shift in power supply facilities from those that use oil and nuclear power, which are worried about fuel depletion, to those that use natural energy (wind power, solar light, etc.) that is friendly to the environment. Yes. In particular, wind power generation facilities are spreading worldwide because of their low power generation cost and short construction period. In Japan, wind power generation is a priority technology at the national level, and further development is desired.
このような風力発電設備では、風力を受けるプロペラが、地上または洋上の数十メートル上空に配置される。このため、寒冷地に設けられた風力発電設備では、上記プロペラやこれに接続される機器（増速機など）が、−２０℃以下の低温環境下に配置されることもある。また、上記増速機のギヤボックスやベアリング用部品は、形状が複雑なので、現状だと鋳造法でしか製造することができない。 In such a wind power generation facility, a propeller that receives wind power is disposed on the ground or in the sky several tens of meters above the ocean. For this reason, in a wind power generation facility provided in a cold region, the propeller and devices (such as a gearbox) connected to the propeller may be arranged in a low temperature environment of −20 ° C. or lower. In addition, the gear box and bearing parts of the speed increaser have complicated shapes, so that they can be manufactured only by the casting method at present.
したがって、低温靭性に優れた鋳鉄が要望されており、この要望を満たすために、フェライト基地に微細な多数の球状黒鉛を均質に分布させた球状黒鉛鋳鉄が提案されている（例えば、特許文献１参照）。この球状黒鉛鋳鉄は、上記特許文献１の実験データにより、−４０℃での優れた靭性を確保していることが示されている。また、上記球状黒鉛鋳鉄は、上記特許文献１の記載によると、フェライト化焼きなましを行うことにより、さらに靭性および伸びが向上する。 Therefore, cast iron excellent in low-temperature toughness is demanded, and in order to satisfy this demand, spheroidal graphite cast iron in which a large number of fine spheroidal graphites are uniformly distributed on a ferrite base has been proposed (for example, Patent Document 1). reference). The spheroidal graphite cast iron shows that the toughness at −40 ° C. is secured by the experimental data of Patent Document 1 described above. Further, according to the description in Patent Document 1, the spheroidal graphite cast iron is further improved in toughness and elongation by performing ferritic annealing.
ところで、上記特許文献１に記載の球状黒鉛鋳鉄は、高価な元素であるＮｉが比較的多く添加されるので、当然ながら高価である。また、上記球状黒鉛鋳鉄に添加されるＢｉは、黒鉛化を阻害して球状黒鉛の微細化作用があるものの、歩留まりが悪い上に変動しやすいので、成分調整が困難である。さらに、上記球状黒鉛鋳鉄の製造において、フェライト化焼きなましを行うと、工数が増えることになる。したがって、上記特許文献１に記載の球状黒鉛鋳鉄は、高コストになるという問題があった。 Incidentally, the spheroidal graphite cast iron described in Patent Document 1 is naturally expensive because Ni, which is an expensive element, is added in a relatively large amount. Further, Bi added to the spheroidal graphite cast iron has the effect of refining the spheroidal graphite by inhibiting the graphitization, but the yield is poor and it is likely to fluctuate, so that it is difficult to adjust the components. Furthermore, in the production of the above-mentioned spheroidal graphite cast iron, the number of man-hours increases when ferritic annealing is performed. Therefore, the spheroidal graphite cast iron described in Patent Document 1 has a problem of high cost.
そこで、本発明は、良好な機械的性質および優れた低温靭性を確保しつつ、大幅にコストを低減し得る球状黒鉛鋳鉄およびその製造方法を提供することを目的とする。 Therefore, an object of the present invention is to provide a spheroidal graphite cast iron and a method for producing the same that can significantly reduce costs while ensuring good mechanical properties and excellent low temperature toughness.
上記課題を解決するため、請求項１に係る本発明の球状黒鉛鋳鉄は、Ｃを３．５〜４．０質量％、Ｓｉを１．７〜２．３質量％、Ｍｎを０．２質量％未満、Ｃｒを０．１質量％未満、Ｍｇを０．０４〜０．０６質量％、ＣｕおよびＳ、並びにその他不可避的不純物を含有して、残部がＦｅからなり、氷点下で使用される球状黒鉛鋳鉄であって、
上記Ｃｕを０．１０〜０．２０質量％、上記Ｓを０．０１〜０．０２質量％含有するものである。
In order to solve the above-mentioned problems, the spheroidal graphite cast iron of the present invention according to claim 1 is such that C is 3.5 to 4.0 mass%, Si is 1.7 to 2.3 mass%, and Mn is 0.2 mass. less%, less than 0.1 wt% of Cr, the M g 0.04 to 0.06 wt%, containing Cu and S, as well as other unavoidable impurities, the balance being Fe, is used in sub-zero Spheroidal graphite cast iron,
The Cu 0.10 to 0.20 wt%, those containing the S 0.01 to 0.02 wt%.
また、請求項２に係る本発明の球状黒鉛鋳鉄の製造方法は、請求項１に記載の球状黒鉛鋳鉄を溶湯の鋳込みにより製造する球状黒鉛鋳鉄の製造方法であって、
上記鋳込み前に、Ｓを含有する接種剤を溶湯に添加する第一接種工程と、
上記鋳込み時に、Ｓを含有する接種剤を溶湯に添加する第二接種工程とが具備されるものである。
A method for producing the spheroidal graphite cast iron of the present invention according to claim 2 is a method for producing the spheroidal graphite cast iron according to claim 1, wherein the spheroidal graphite cast iron according to claim 1 is produced by casting a molten metal.
Before the casting, a first inoculation step of adding an inoculum containing S to the molten metal,
A second inoculation step of adding an inoculum containing S to the molten metal at the time of casting.
さらに、請求項３に係る本発明の球状黒鉛鋳鉄の製造方法は、請求項２に記載の球状黒鉛鋳鉄の製造方法において、フェライト化焼きなましを行わないものである。 Furthermore, the manufacturing method of the spheroidal graphite cast iron of the present invention according to claim 3 is the same as the manufacturing method of the spheroidal graphite cast iron according to claim 2, but does not perform ferrite annealing.
上記球状黒鉛鋳鉄およびその製造方法によると、良好な機械的性質および優れた低温靭性を確保しつつ、大幅にコストを低減することができる。 According to the above spheroidal graphite cast iron and its manufacturing method, it is possible to significantly reduce the cost while ensuring good mechanical properties and excellent low temperature toughness.
以下、本発明の実施の形態に係る球状黒鉛鋳鉄およびその製造方法について説明する。なお、本実施の形態において、低温とは氷点下（０℃以下）を言う。
まず、上記球状黒鉛鋳鉄について説明する。
Hereinafter, the spheroidal graphite cast iron and the manufacturing method thereof according to the embodiment of the present invention will be described. In the present embodiment, low temperature means below freezing point (0 ° C. or lower).
First, the spheroidal graphite cast iron will be described.
この球状黒鉛鋳鉄は、Ｃ（炭素）を３．５〜４．０質量％、Ｓｉ（ケイ素）を１．７〜２．３質量％、Ｍｎ（マンガン）を０．２質量％未満、Ｃｒ（クロム）を０．１質量％未満、およびＭｇ（マグネシウム）を０．０４〜０．０６質量％、Ｐ（リン）を０．０２５質量％未満含有する。 This spheroidal graphite cast iron has C (carbon) of 3.5 to 4.0 mass%, Si (silicon) of 1.7 to 2.3 mass%, Mn (manganese) of less than 0.2 mass%, Cr ( Chromium) is contained in an amount of less than 0.1% by mass, Mg (magnesium) in an amount of 0.04 to 0.06% by mass, and P (phosphorus) in an amount of less than 0.025% by mass.
特に上記球状黒鉛鋳鉄は、その特徴として、Ｃｕ（銅）を０．１０〜０．２０質量％、Ｓ（硫黄）を０．０１〜０．０２質量％含有する。なお、上記球状黒鉛鋳鉄は、その他不可避的不純物も含有し、残部がＦｅ（鉄）などからなる。 In particular, the spheroidal graphite cast iron contains 0.10 to 0.20 mass% Cu (copper) and 0.01 to 0.02 mass% S (sulfur) as its features. The spheroidal graphite cast iron contains other inevitable impurities, and the balance is Fe (iron).
次に、上述の成分範囲にした理由について説明する。
ＣおよびＳｉの含有量については、それぞれの範囲を、ＣＥ値（Ｃ＋Ｓｉ／３）が４．３程度になるようにして定めた。なぜなら、ＣＥ値と機械的強度とには強い相関関係があり、球状黒鉛鋳鉄の所定の機械的強度を確保するためである。特にＳｉの含有量については、Ｓｉを多量に含有すると０．２％耐力および引張強さが向上するものの、−２０℃での衝撃値が低下するので、これらが図１および図２に示すＤＩＮ規格を満たす範囲として、１．７％〜２．３％とした。なお、上記ＤＩＮ規格は、図１および図２に示すように、ＥＮ−ＧＪＳ−４００Ｕ−Ｌ相当材において、０．２％耐力が２２０ＭＰａ以上、引張強さが３７０ＭＰａ以上、−２０℃での衝撃値が１０Ｊ以上である。
Next, the reason why the above-described component range is adopted will be described.
Regarding the contents of C and Si, the respective ranges were determined such that the CE value (C + Si / 3) was about 4.3. This is because there is a strong correlation between the CE value and the mechanical strength, and the predetermined mechanical strength of the spheroidal graphite cast iron is ensured. In particular, with respect to the Si content, 0.2% proof stress and tensile strength are improved when a large amount of Si is contained, but the impact value at −20 ° C. decreases. The range satisfying the standard was 1.7% to 2.3%. In addition, as shown in FIG. 1 and FIG. 2, the DIN standard is an EN-GJS-400U-L equivalent material with a 0.2% proof stress of 220 MPa or more, a tensile strength of 370 MPa or more, and an impact at −20 ° C. The value is 10J or more.
Ｍｎの含有量については、Ｍｎを多量に含有するとパーライトが生成されるので、０．２質量％未満とした。
Ｃｒの含有量については、Ｃｒを多量に含有すると炭化物が生成されるので、０．１質量％未満とした。
The Mn content was set to less than 0.2% by mass because pearlite was produced when a large amount of Mn was contained.
The Cr content was set to less than 0.1% by mass because carbide is generated when a large amount of Cr is contained.
Ｍｇの含有量については、黒鉛の球状化のために、０．０４〜０．０６質量％とした。
Ｐの含有量については、Ｐは不可避的不純物の１つであるから、特に限定されるものではないが、一例として０．０２５質量％以下とした。
The Mg content was set to 0.04 to 0.06% by mass for spheroidizing graphite.
The content of P is not particularly limited because P is one of the inevitable impurities, but is 0.025% by mass or less as an example.
以下、本発明の要旨であるＣｕおよびＳの成分範囲について詳細に説明する。
一般に鋳鉄は、Ｃｕを含有させることにより、機械的性質が良好になるものの、低温靭性に劣る。言い換えれば、０．２％耐力および引張強さが向上するものの、低温での衝撃値が低下する。しかしながら、本発明者らは、Ｃｕの含有量が０．１０〜０．２０質量％であれば、良好な機械的性質と優れた低温靭性とが両立することを見出した。具体的には、α−Ｆｅ（フェライト）にＣｕが０．１０質量％以上固溶すると、機械的性質が良好になるとともに、低温靭性に優れる。しかし、α−Ｆｅ（フェライト）におけるＣｕの溶解度（常温）は０．２０質量％であり、それを超えると低温靭性に劣る。したがって、０．１０〜０．２０質量％が、Ｃｕの好ましい含有量である。これにより、本発明の鋳鉄では、特許文献１のように高価なＮｉを添加することなく、良好な機械的性質と優れた低温靭性とが両立する。
Hereinafter, the component ranges of Cu and S which are the gist of the present invention will be described in detail.
In general, cast iron contains Cu, but its mechanical properties are improved, but it is inferior in low-temperature toughness. In other words, although the 0.2% proof stress and the tensile strength are improved, the impact value at a low temperature is lowered. However, the present inventors have found that if the Cu content is 0.10 to 0.20% by mass, good mechanical properties and excellent low temperature toughness are compatible. Specifically, when Cu is dissolved in α-Fe (ferrite) in an amount of 0.10% by mass or more, the mechanical properties are improved and the low temperature toughness is excellent. However, the solubility (normal temperature) of Cu in α-Fe (ferrite) is 0.20% by mass, and if it exceeds that, the low temperature toughness is inferior. Therefore, 0.10 to 0.20 mass% is a preferable content of Cu. Thereby, the cast iron of the present invention achieves both good mechanical properties and excellent low temperature toughness without adding expensive Ni as in Patent Document 1.
また、さらに優れた低温靭性を得るために、鋳鉄における球状黒鉛は、微細且つ多数であって均質に分布していることが望ましい。ここで、通常の球状化剤を使用すると、球状黒鉛は所望のサイズよりも大きくなる。しかしながら、本発明者らは、Ｓの接種を行うことにより、球状黒鉛が所望のサイズに微細分散することを確認した。原理的には、ＳがＭｇＳ（硫化マグネシウム）などを生成し、これらＭｇＳなどが球状黒鉛の核になると考えられる。したがって、Ｓの接種を行うことにより、特許文献１のように成分調整が困難なＢｉを添加することなく、球状黒鉛が微細分散する。 In order to obtain further excellent low temperature toughness, it is desirable that the spheroidal graphite in the cast iron is fine and numerous and is uniformly distributed. Here, when a normal spheroidizing agent is used, the spherical graphite becomes larger than a desired size. However, the present inventors have confirmed that spherical graphite is finely dispersed in a desired size by inoculating S. In principle, it is considered that S generates MgS (magnesium sulfide) and the like, and these MgS and the like become the core of the spherical graphite. Therefore, by inoculating S, spherical graphite is finely dispersed without adding Bi, which is difficult to adjust as in Patent Document 1.
以下、上記球状黒鉛鋳鉄の製造方法について、具体的に示した実施例を説明する。 Hereinafter, specific examples of the method for producing the spheroidal graphite cast iron will be described.
溶解炉には、５ｔｏｎ低周波溶解炉を使用した。また、成分調整後の出湯の温度を１４８０℃とした。
次に、球状化剤としてＦｅ−Ｓｉ−Ｍｇ合金を取鍋内添加した。ここで、添加方法をサンドイッチ法とし、添加量を１．１％とした。そして、一次接種としてＦｅ−Ｓｉ−Ｃａ−Ｓ合金（第一接種剤）を取鍋内添加した（第一接種工程）。ここで、添加方法をサンドイッチ法とし、添加量を０．３％とした。
A 5 ton low frequency melting furnace was used as the melting furnace. Moreover, the temperature of the hot water after component adjustment was 1480 degreeC.
Next, an Fe—Si—Mg alloy was added in the ladle as a spheroidizing agent. Here, the addition method was a sandwich method, and the addition amount was 1.1%. And Fe-Si-Ca-S alloy (1st inoculum) was added in the pan as primary inoculation (1st inoculation process). Here, the addition method was a sandwich method, and the addition amount was 0.3%.
その後、二次接種としてＦｅ−Ｓｉ−Ｃａ−Ｓ合金（第二接種剤）を、鋳込み流（鋳込み中の溶湯流れ）に直接添加した（第二接種工程）。ここで、添加温度が１３５０℃であり、添加量を０．１％とした。なお、二次接種を行う理由は、確実に接種の効果を得て、微細で多数の球状黒鉛を生成するためである。すなわち、二次接種は、一次接種から鋳込みまでの時間経過により薄れた一次接種の効果を補うためのものである。また、鋳込みには、ＪＩＳＧ５５０２本体付き供試材を採取できるようにした。 Then, the Fe-Si-Ca-S alloy (second inoculum) was directly added to the casting flow (melt flow during casting) as the second inoculation (second inoculation step). Here, the addition temperature was 1350 ° C., and the addition amount was 0.1%. In addition, the reason for performing the secondary inoculation is that the effect of the inoculation is surely obtained and fine and many spherical graphites are generated. That is, the secondary inoculation is intended to supplement the effect of the primary inoculation that has faded over time from the primary inoculation to casting. In addition, for casting, a specimen with a JISG5502 main body can be collected.
そして、上記鋳込み後には、熱処理を行わず、つまり鋳放しとした。
引張試験片はＪＩＳ１４Ａに準拠したものとし、衝撃試験片はＪＩＳ４号（Ｖノッチ）に準拠したものとした。以下、採取した供試材の成分並びに試験片の機械的性質および低温靭性を、比較材（１）〜（３）とともに表１および表２に示す。また、表２の内容をグラフ化して、図１に示す。
Then, after the casting, no heat treatment was performed, that is, casting was performed.
The tensile test piece was based on JIS14A, and the impact test piece was based on JIS4 (V notch). Hereinafter, the components of the sample material collected and the mechanical properties and low temperature toughness of the test pieces are shown in Tables 1 and 2 together with the comparative materials (1) to (3). Further, the contents of Table 2 are graphed and shown in FIG.
本実施例２に係る球状黒鉛鋳鉄の製造方法は、上記実施例１に係る製造方法の鋳込み後に、応力除去焼なましの熱処理を行ったものである。これ以外については、実施例２は実施例１と同一である。 The manufacturing method of the spheroidal graphite cast iron according to the second embodiment is a heat treatment for stress relief annealing after the casting of the manufacturing method according to the first embodiment. In other respects, Example 2 is the same as Example 1.
すなわち、本実施例２では、鋳込み後に、応力除去焼なましの熱処理として、５９０℃で５時間保持し、その後は炉内でゆっくりと冷却（炉冷）した。以下、採取した供試材の成分並びに試験片の機械的性質および低温靭性を、比較材（１）〜（３）および従来材とともに表３および表４に示す。また、表４の内容をグラフ化して、図２に示す。なお、上記従来材は、比較材（３）相当材において、Ｎｉの含有量を、本発明材のＣｕの含有量と同じにしたものである。 That is, in this Example 2, after casting, as heat treatment for stress relief annealing, it was held at 590 ° C. for 5 hours, and then slowly cooled (furnace cooling) in the furnace. Hereinafter, the components of the collected specimens and the mechanical properties and low temperature toughness of the test pieces are shown in Tables 3 and 4 together with the comparative materials (1) to (3) and the conventional materials. Further, the contents of Table 4 are graphed and shown in FIG. The conventional material is the same as the comparative material (3), but the Ni content is the same as the Cu content of the present invention material.
このように、本発明の上記球状黒鉛鋳鉄およびその製造方法によると、球状黒鉛鋳鉄の機械的性質および低温靭性を向上させることができた。また、高価なＮｉや成分調整が困難なＢｉを用いないので、大幅にコストを低減することができた。さらに、上記製造方法によると、熱処理を行わず、または応力除去焼なましのみの熱処理を行い、フェライト化焼なましを行わないので、工数を減らし、一層コストを低減することができた。 Thus, according to the above-mentioned spheroidal graphite cast iron of the present invention and the production method thereof, the mechanical properties and low-temperature toughness of the spheroidal graphite cast iron could be improved. Moreover, since expensive Ni and Bi which is difficult to adjust components are not used, the cost can be significantly reduced. Furthermore, according to the above manufacturing method, heat treatment is not performed, or heat treatment is performed only for stress-relief annealing, and ferrite annealing is not performed. Therefore, man-hours can be reduced and costs can be further reduced.
ところで、上記実施例１および２では、第一接種剤および第二接種剤として、Ｆｅ−Ｓｉ−Ｃａ−Ｓ合金について説明したが、これに限定されるものではなく、Ｓを含有するものであればよい。 By the way, in the said Example 1 and 2, although Fe-Si-Ca-S alloy was demonstrated as a 1st inoculation agent and a 2nd inoculation agent, it is not limited to this, What is contained S That's fine.
Claims (3)
上記Ｃｕを０．１０〜０．２０質量％、上記Ｓを０．０１〜０．０２質量％含有することを特徴とする球状黒鉛鋳鉄。 C is 3.5 to 4.0% by mass, Si is 1.7 to 2.3% by mass, Mn is less than 0.2% by mass, Cr is less than 0.1% by mass , and Mg is 0.04 to 0%. 0.06% by mass, Cu and S, and other inevitable impurities, the balance being Fe, and the spheroidal graphite cast iron used below freezing point,
The Cu 0.10 to 0.20 wt%, spheroidal graphite cast iron, characterized in that it contains the S 0.01 to 0.02 wt%.
上記鋳込み前に、Ｓを含有する接種剤を溶湯に添加する第一接種工程と、
上記鋳込み時に、Ｓを含有する接種剤を溶湯に添加する第二接種工程とが具備されることを特徴とする球状黒鉛鋳鉄の製造方法。 A method for producing spheroidal graphite cast iron according to claim 1, wherein the spheroidal graphite cast iron according to claim 1 is produced by casting a molten metal.
Before the casting, a first inoculation step of adding an inoculum containing S to the molten metal,
And a second inoculation step of adding an inoculum containing S to the molten metal at the time of casting.
3. The method for producing spheroidal graphite cast iron according to claim 2, wherein ferritic annealing is not performed.
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