JP6993646B2 - Inoculant for cast iron - Google Patents
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- JP6993646B2 JP6993646B2 JP2018083115A JP2018083115A JP6993646B2 JP 6993646 B2 JP6993646 B2 JP 6993646B2 JP 2018083115 A JP2018083115 A JP 2018083115A JP 2018083115 A JP2018083115 A JP 2018083115A JP 6993646 B2 JP6993646 B2 JP 6993646B2
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Description
本発明は、ダクタイル鋳鉄などの黒鉛粒数を増加させるための鋳鉄用接種剤に関するものである。 The present invention relates to an inoculant for cast iron for increasing the number of graphite grains such as ductile cast iron.
従来から黒鉛粒数を増加させるための鋳鉄用接種剤としては、母合金のなかに硫黄と黒鉛球状化元素との化合物を含有することを特徴とし、さらに詳細には、硫黄と化合したマグネシウムとの化合物、硫黄と化合した希土類元素との化合物、硫黄とマグネシウムと希土類元素との化合物のいずれかの化合物を含有する母合金としたことを特徴とするものが存在する（特許文献１）。 Conventionally, the injecting agent for cast iron for increasing the number of graphite grains has been characterized by containing a compound of sulfur and a graphite spheroidizing element in the mother alloy, and more specifically, magnesium combined with sulfur. (Patent Document 1), there is a compound characterized by containing a compound of any of the above compounds, a compound of a rare earth element compounded with sulfur, and a compound of sulfur, magnesium, and a rare earth element (Patent Document 1).
さらに、この種の鋳鉄用接種剤としては、球状黒鉛鋳鉄の溶湯処理の際に溶湯に接触させられる球状黒鉛鋳鉄用接種剤であって、ＳｉＣ粉末と少なくともＦｅ－Ｓｉ系合金とを複合化してなるものが存在する（特許文献２）。 Further, this type of injectant for cast iron is an injectant for spheroidal graphite cast iron that is brought into contact with the molten metal during the molten metal treatment of spheroidal graphite cast iron, and is a composite of SiC powder and at least an Fe—Si alloy. (Patent Document 2).
また、この種の鋳鉄用接種剤としては、球状黒鉛鋳鉄の鋳鉄溶湯に接種を行うためのＢｉ系接種剤であって、Ｂｉと、Ｎｉ、Ｃｕのいずれか１種または２種とを含む混合物または合金であることを特徴とするものが存在する（特許文献３）。 Further, this kind of inoculator for cast iron is a Bi-based inoculator for inoculating molten cast iron of spheroidal graphite cast iron, and is a mixture containing Bi and any one or two of Ni and Cu. Alternatively, there is one characterized by being an alloy (Patent Document 3).
ダクタイル鋳鉄などの鋳造において、接種剤による黒鉛粒数の増加によって得られる効果としては、鋳鉄の材質強度の向上、引け性（鋳造不良）の低減、鋳造歩留まりの向上（コスト低減）などが考えられる。 In casting of ductile cast iron, etc., the effects obtained by increasing the number of graphite grains by the injectant are considered to be improvement of the material strength of cast iron, reduction of shrinkage (casting defect), improvement of casting yield (cost reduction), etc. ..
そこで、本発明は、従来の接種剤と同等以上に黒鉛粒数を増加させる接種剤を提供することを目的としてなされたものである。 Therefore, the present invention has been made for the purpose of providing an inoculant that increases the number of graphite grains to be equal to or higher than that of a conventional inoculant.
そのため、本発明の鋳鉄用接種剤は、Ｆｅ―Ｓｉ系合金に、Ｃａ、Ａｌのいずれの元素も含有したものとすると共に、Ｔｉ、Ｖ、Ｎｂのうちいずれか一つ以上の元素を含有したものとし、Ｓｉが７０～７５重量％、Ｃａが２．２～２．３重量％、Ａｌが１．３～１．４重量％、Ｔｉ、Ｖ、Ｎｂのうちいずれか一つ以上の元素の合計が０．５～６．０重量％、残りが主にＦｅからなるものとしている。 Therefore, the inoculant for cast iron of the present invention is assumed to contain any element of Ca or Al in the Fe—Si alloy, and also contains any one or more of Ti, V and Nb. It is assumed that Si is 70 to 75% by weight, Ca is 2.2 to 2.3% by weight, Al is 1.3 to 1.4% by weight, and one or more of Ti, V, and Nb is used. The total is 0.5 to 6.0% by weight, and the rest is mainly composed of Fe .
そして、本発明の鋳鉄用接種剤は、平均粒径が０．１～１０．０ｍｍの粉末であるものとしている。 The inoculant for cast iron of the present invention is a powder having an average particle size of 0.1 to 10.0 mm.
本発明の鋳鉄用接種剤は、以上に述べたように構成されており、従来の接種剤と同等以上に黒鉛粒数を増加させることができるものとなった。 The inoculant for cast iron of the present invention is configured as described above, and the number of graphite grains can be increased to the same level as or higher than that of the conventional inoculant.
以下、本発明の鋳鉄用接種剤を実施するための形態を詳細に説明する。 Hereinafter, embodiments for carrying out the inoculant for cast iron of the present invention will be described in detail.
本発明の鋳鉄用接種剤は、ＦｅーＳｉ系合金に、Ｔｉ、Ｖ、Ｎｂのうちいずれか一つ以上の元素を含有したものとし、Ｓｉが７０～７５重量％、Ｔｉ、Ｖ、Ｎｂのうちいずれか一つ以上の元素の合計が０．５～６．０重量％、残りが主にＦｅからなるものとしている。 The inoculant for cast iron of the present invention is a Fe-Si alloy containing one or more of Ti, V, and Nb, and has 70 to 75% by weight of Si, Ti, V, and Nb. It is assumed that the total of any one or more of the elements is 0.5 to 6.0% by weight, and the rest is mainly composed of Fe.
本発明の鋳鉄用接種剤は、粉末であるものとしており、その粒度は接種剤の添加時期によって異なるが、平均粒径が０．１～１０．０ｍｍの粉末であるものとしている。接種剤の添加時期が遅いほど、粒度は小さくするのが好ましい。鋳込み直前で大きいものを使用すると溶け残り、また取鍋時であまり小さいものを使用すると取鍋付着しスラグ化、速く溶けて効果がでないなどの問題があるからである。例えば、接種剤の添加時期が、注湯流添加であれば０．２５～１．０ｍｍとするのが好ましく、鋳型内添加であれば０．２５ｍｍ未満とするのがより好ましく、取鍋添加であれば１．０～１０．０ｍｍとするのが好ましい。 The inoculant for cast iron of the present invention is a powder, and the particle size thereof varies depending on the timing of addition of the inoculant, but the average particle size is 0.1 to 10.0 mm. The later the inoculant is added, the smaller the particle size is preferably. This is because if a large one is used immediately before casting, it remains undissolved, and if a too small one is used at the time of ladle, it adheres to the ladle and becomes slag, and it melts quickly and has no effect. For example, the timing of addition of the inoculant is preferably 0.25 to 1.0 mm when the inoculant is added, more preferably less than 0.25 mm when the inoculant is added in the mold, and the ladle is added. If there is, it is preferably 1.0 to 10.0 mm.
本発明の鋳鉄用接種剤において、ＦｅーＳｉ系合金は、ＣａおよびＡｌのいずれの元素をも含有したものとしている。本発明の実施例で用いたＦｅーＳｉ系合金のＣａの含有量は２．２～２．３重量％、Ａｌ含有量は１．３～１．４重量％とした。
In the inoculant for cast iron of the present invention, the Fe-Si alloy contains both elements of Ca and Al. The Ca content of the Fe-Si alloy used in the examples of the present invention was 2.2 to 2.3% by weight, and the Al content was 1.3 to 1.4% by weight .
本発明の鋳鉄用接種剤は、Ｔｉの含有量が０．５～２．０重量％であるものとしており、好ましくは１．７～１．９重量％であるものとしている。本発明の鋳鉄用接種剤において、Ｔｉの含有量をこのような範囲としたのは、Ｔｉの含有量が０．５重量％未満である場合には黒鉛粒数の増加があまり見られず、Ｔｉの含有量が２．０重量％を超える場合にもそれ以上の黒鉛粒数の増加があまり見られないと共に、過剰添加すると球状化阻害の恐れがあるからである。 The inoculant for cast iron of the present invention has a Ti content of 0.5 to 2.0% by weight, preferably 1.7 to 1.9% by weight. In the inoculant for cast iron of the present invention, the Ti content was set in such a range because the increase in the number of graphite grains was not so much observed when the Ti content was less than 0.5% by weight. This is because even when the Ti content exceeds 2.0% by weight, the number of graphite grains does not increase so much, and if it is excessively added, spheroidization may be inhibited.
本発明の鋳鉄用接種剤は、Ｖの含有量が０．５～２．０重量％であるものとしており、好ましくは１．８～２．０重量％であるものとしている。本発明の鋳鉄用接種剤において、Ｖの含有量をこのような範囲としたのは、Ｖの含有量が０．５重量％未満である場合には黒鉛粒数の増加があまり見られず、Ｖの含有量が２．０重量％を超える場合にもそれ以上の黒鉛粒数の増加があまり見られないと共に、過剰添加すると球状化阻害の恐れがあるからである。 The inoculant for cast iron of the present invention has a V content of 0.5 to 2.0% by weight, preferably 1.8 to 2.0% by weight. In the inoculant for cast iron of the present invention, the reason why the V content is set in such a range is that when the V content is less than 0.5% by weight, the number of graphite grains does not increase so much. This is because even when the V content exceeds 2.0% by weight, the number of graphite grains does not increase so much, and if it is excessively added, spheroidization may be inhibited.
本発明の鋳鉄用接種剤は、Ｎｂの含有量が０．５～２．０重量％であるものとしており、好ましくは１．６～１．８重量％であるものとしている。本発明の鋳鉄用接種剤において、Ｎｂの含有量をこのような範囲としたのは、Ｎｂの含有量が０．５重量％未満である場合には黒鉛粒数の増加があまり見られず、Ｎｂの含有量が２．０重量％を超える場合にもそれ以上の黒鉛粒数の増加があまり見られないと共に、過剰添加すると球状化阻害の恐れがあるからである。 The inoculant for cast iron of the present invention has an Nb content of 0.5 to 2.0% by weight, preferably 1.6 to 1.8% by weight. In the inoculant for cast iron of the present invention, the Nb content was set in such a range because when the Nb content was less than 0.5% by weight, the number of graphite grains did not increase so much. This is because even when the Nb content exceeds 2.0% by weight, the number of graphite grains does not increase so much, and if it is excessively added, spheroidization may be inhibited.
（実施例１）
表１に示すように、Ｆｅ：２２．５重量％、Ｓｉ：７２．０重量％、Ｃａ：２．３重量％、Ａｌ：１．４重量％、Ｔｉ：１．８重量％からなる接種剤を調製し、ダクタイル鋳鉄系溶湯中に０．１重量％添加した。そして接種処理された溶湯から、鋳造により円柱形状のテストピ－スを作製し、実施例１の接種調製鋳鉄を得た。
(Example 1)
As shown in Table 1, an inoculant consisting of Fe: 22.5% by weight, Si: 72.0% by weight, Ca: 2.3% by weight, Al: 1.4% by weight, and Ti: 1.8% by weight. Was prepared and added in an amount of 0.1% by weight in a ductile cast iron-based molten metal. Then, a cylindrical test piece was produced from the inoculated molten metal by casting to obtain the inoculated prepared cast iron of Example 1.
（実施例２）
表１に示すように、Ｆｅ：２２．８重量％、Ｓｉ：７１．６重量％、Ｃａ：２．３重量％、Ａｌ：１．３重量％、Ｖ：１．９重量％からなる接種剤を調製し、ダクタイル鋳鉄系溶湯中に０．１重量％添加した。そして接種処理された溶湯から、鋳造により円柱形状のテストピ－スを作製し、実施例２の接種調製鋳鉄を得た。
(Example 2)
As shown in Table 1, an inoculant consisting of Fe: 22.8% by weight, Si: 71.6% by weight, Ca: 2.3% by weight, Al: 1.3% by weight, and V: 1.9% by weight. Was prepared and added in an amount of 0.1% by weight in a ductile cast iron-based molten metal. Then, a cylindrical test piece was produced from the inoculated molten metal by casting to obtain inoculated prepared cast iron of Example 2.
（実施例３）
表１に示すように、Ｆｅ：２２．９重量％、Ｓｉ：７１．８重量％、Ｃａ：２．２重量％、Ａｌ：１．４重量％、Ｎｂ：１．７重量％からなる接種剤を調製し、ダクタイル鋳鉄系溶湯中に０．１重量％添加した。そして接種処理された溶湯から、鋳造により円柱形状のテストピ－スを作製し、実施例２の接種調製鋳鉄を得た。
(Example 3)
As shown in Table 1, an inoculant consisting of Fe: 22.9% by weight, Si: 71.8% by weight, Ca: 2.2% by weight, Al: 1.4% by weight, and Nb: 1.7% by weight. Was prepared and added in an amount of 0.1% by weight in a ductile cast iron-based molten metal. Then, a cylindrical test piece was produced from the inoculated molten metal by casting to obtain inoculated prepared cast iron of Example 2.
（比較例１）
表１に示すように、Ｆｅ：２５．８重量％、Ｓｉ：７２．３重量％、Ｃａ：０．７重量％、Ａｌ：１．２重量％からなる接種剤を調製し、ダクタイル鋳鉄系溶湯中に０．１重量％添加した。そして接種処理された溶湯から、鋳造により円柱形状のテストピ－スを作製し、比較例１の接種調製鋳鉄を得た。
(Comparative Example 1)
As shown in Table 1, an inoculant consisting of Fe: 25.8% by weight, Si: 72.3% by weight, Ca: 0.7% by weight, and Al: 1.2% by weight was prepared, and a ductile cast iron-based molten metal was prepared. 0.1% by weight was added therein. Then, a cylindrical test piece was produced from the inoculated molten metal by casting to obtain inoculated prepared cast iron of Comparative Example 1.
（比較例２）
表１に示すように、Ｆｅ：２３．６重量％、Ｓｉ：７２．８重量％、Ｃａ：１．５重量％、Ａｌ：２．２重量％からなる接種剤を調製し、ダクタイル鋳鉄系溶湯中に０．１重量％添加した。そして接種処理された溶湯から、鋳造により円柱形状のテストピ－スを作製し、比較例２の接種調製鋳鉄を得た。
(Comparative Example 2)
As shown in Table 1, an inoculant consisting of Fe: 23.6% by weight, Si: 72.8% by weight, Ca: 1.5% by weight, and Al: 2.2% by weight was prepared, and a ductile cast iron-based molten metal was prepared. 0.1% by weight was added therein. Then, a cylindrical test piece was produced from the inoculated molten metal by casting to obtain inoculated prepared cast iron of Comparative Example 2.
（比較例３）
表１に示すように、Ｆｅ：２１．４重量％、Ｓｉ：７２．５重量％、Ｃａ：３．９重量％、Ａｌ：２．２重量％からなる接種剤を調製し、ダクタイル鋳鉄系溶湯中に０．１重量％添加した。そして接種処理された溶湯から、鋳造により円柱形状のテストピ－スを作製し、比較例３の接種調製鋳鉄を得た。
(Comparative Example 3)
As shown in Table 1, an inoculant consisting of Fe: 21.4% by weight, Si: 72.5% by weight, Ca: 3.9% by weight, and Al: 2.2% by weight was prepared, and a ductile cast iron-based molten metal was prepared. 0.1% by weight was added therein. Then, a cylindrical test piece was produced from the inoculated molten metal by casting to obtain inoculated prepared cast iron of Comparative Example 3.
このようにして得られた実施例１～３の接種調製鋳鉄の肉厚部組織を顕微鏡により観察した結果は、図１（ａ）～（ｃ）に示した顕微鏡写真のとおりであり、黒鉛粒数は、実施例１が４１８個／ｍｍ2 、実施例２が４１６個／ｍｍ2 、実施例３が４２１個／ｍｍ2 であり、黒鉛球状化率（ＪＩＳ：ＮＩＫ法）は、実施例１が９５．１％、実施例２が９５．０％、実施例３が９４．７％であった。
た。
The results of observing the thick structure of the inoculum-prepared cast iron of Examples 1 to 3 thus obtained with a microscope are as shown in the micrographs shown in FIGS. 1 (a) to 1 (c), and graphite grains. The number was 418 pieces / mm 2 in Example 1, 416 pieces / mm 2 in Example 2, 421 pieces / mm 2 in Example 3, and the graphite spheroidization rate (JIS: NIK method) was in Example 1. Was 95.1%, Example 2 was 95.0%, and Example 3 was 94.7%.
rice field.
また、比較例１～３の接種調製鋳鉄の肉厚部組織を顕微鏡により観察した結果は、図２（ａ）～（ｃ）に示した顕微鏡写真のとおりであり、黒鉛粒数は、比較例１が２７１個／ｍｍ2 、比較例２が２７９個／ｍｍ2 、比較例３が３４５個／ｍｍ2 であり、黒鉛球状化率（ＪＩＳ：ＮＩＫ法）は、比較例１が９２．６％、比較例２が９３．３％、比較例３が９６．１％であった。 The results of observing the thick structure of the inoculated cast iron of Comparative Examples 1 to 3 with a microscope are as shown in the micrographs shown in FIGS. 2 (a) to 2 (c), and the number of graphite grains is the comparative example. 1 is 271 pieces / mm 2 , Comparative Example 2 is 279 pieces / mm 2 , Comparative Example 3 is 345 pieces / mm 2 , and the graphite spheroidization rate (JIS: NIK method) is 92.6% in Comparative Example 1. Comparative Example 2 was 93.3%, and Comparative Example 3 was 96.1%.
以上の結果、黒鉛粒数においては、実施例１～３は、いずれも４００個／ｍｍ2 以上となっており、比較例１、２は、２８０個／ｍｍ2 止まりであり、比較例３でも３５０個／ｍｍ2 止まりであり、本発明の実施例における黒鉛粒数は、比較例における黒鉛粒数との比較において明らかな有意差が見られた。 As a result of the above, in terms of the number of graphite grains, all of Examples 1 to 3 have 400 pieces / mm 2 or more, Comparative Examples 1 and 2 have only 280 pieces / mm 2 and even in Comparative Example 3. The number was only 350 / mm2 , and the number of graphite grains in the examples of the present invention was clearly significantly different from the number of graphite grains in the comparative example.
なお、黒鉛球状化率においては、実施例１～３の平均値が９５．０％であり、比較例１～３の平均値が９４．０％であり、明らかな有意差は見られなかったが、比較例１、２との比較においては、本発明の実施例の黒鉛球状化率の方が優れていた。 Regarding the graphite spheroidization rate, the average value of Examples 1 to 3 was 95.0%, and the average value of Comparative Examples 1 to 3 was 94.0%, and no clear significant difference was observed. However, in comparison with Comparative Examples 1 and 2, the graphite spheroidization rate of the examples of the present invention was superior.
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| CN107119221A (en) | 2017-04-26 | 2017-09-01 | 含山县朝霞铸造有限公司 | A kind of micro alloyed high strength grey cast iron part and its method of smelting |
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