JP2019189905A - Inoculant for cast iron - Google Patents

Inoculant for cast iron Download PDF

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JP2019189905A
JP2019189905A JP2018083115A JP2018083115A JP2019189905A JP 2019189905 A JP2019189905 A JP 2019189905A JP 2018083115 A JP2018083115 A JP 2018083115A JP 2018083115 A JP2018083115 A JP 2018083115A JP 2019189905 A JP2019189905 A JP 2019189905A
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cast iron
weight
inoculum
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JP6993646B2 (en
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寛明 辻
Hiroaki Tsuji
寛明 辻
昿爾 岡内
Koji Okauchi
昿爾 岡内
登起雄 甲斐
Tokio Kai
登起雄 甲斐
数男 十市
Kazuo Toichi
数男 十市
芳夫 五十嵐
Yoshio Igarashi
芳夫 五十嵐
中江　秀雄
Hideo Nakae
秀雄 中江
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Fundry Service Co Ltd
Toyo Denka Kogyo Co Ltd
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Toyo Denka Kogyo Co Ltd
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Abstract

To provide an inoculant that increases the number of graphite grains at least up to the same level in the conventional inoculant.SOLUTION: The inoculant has an Fe-Si alloy blended with at least one element of Ti, V, and Nb, preferably with Si of 70-75 wt.%, the total of at least one element of Ti, V, and Nb being 0.5-6.0 wt.%, and the balance mainly being Fe.SELECTED DRAWING: Figure 1

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, as an inoculum for cast iron for increasing the number of graphite grains, the master alloy is characterized by containing a compound of sulfur and graphite spheroidizing element, and more specifically, magnesium combined with sulfur and There is one characterized in that it is a master alloy containing any one of the following compounds, a compound of a rare earth element combined 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 inoculum for cast iron is an inoculant for spheroidal graphite cast iron that is brought into contact with the molten metal during the treatment of the spheroidal graphite cast iron, comprising a composite of SiC powder and at least a 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）。   Moreover, as this type of inoculum for cast iron, it is a Bi-based inoculum for inoculating molten iron of spheroidal graphite cast iron, and a mixture containing Bi and any one or two of Ni and Cu Or there exists what is characterized by being an alloy (patent document 3).

特開平９−２６３８１６号公報JP-A-9-263816 特開２０００−２５６７２２号公報JP 2000-256722 A 特開２０１２−３６４２３号公報号公報JP 2012-36423 A

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 castings such as ductile cast iron, the effects obtained by increasing the number of graphite particles due to the inoculant may be improved cast iron material strength, shrinkage (casting failure), 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。   Then, this invention is made | formed for the purpose of providing the inoculant which increases the number of graphite grains more than equivalent to the conventional inoculant.

そのため、本発明の鋳鉄用接種剤は、Ｆｅ―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ている。   Therefore, the inoculant for cast iron of the present invention contains one or more elements of Ti, V, and Nb in the Fe—Si alloy.

そして、本発明の鋳鉄用接種剤は、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。   And the inoculant for cast iron of the present invention has Si of 70 to 75% by weight, the total of any one or more elements of Ti, V, and Nb is 0.5 to 6.0% by weight, and the remainder is mainly It is made 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。   And the inoculant for cast iron of this invention shall be a powder with an average particle diameter of 0.1-10.0 mm.

さらに、本発明の鋳鉄用接種剤は、前記Ｔｉの含有量が０．５〜２．０重量％であるものとしている。   Furthermore, in the inoculum for cast iron of the present invention, the Ti content is 0.5 to 2.0% by weight.

さらに、本発明の鋳鉄用接種剤は、前記Ｖの含有量が０．５〜２．０重量％であるものとしている。   Furthermore, in the inoculum for cast iron of the present invention, the V content is 0.5 to 2.0% by weight.

さらに、本発明の鋳鉄用接種剤は、前記Ｎｂの含有量が０．５〜２．０重量％であるものとしている。   Furthermore, the inoculum for cast iron of the present invention is such that the Nb content is 0.5 to 2.0% by weight.

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 inoculum for cast iron of the present invention is configured as described above, and can increase the number of graphite grains to the same level or more as that of the conventional inoculum.

本発明の実施例の接種剤を添加して製造した鋳鉄の肉厚部組織の顕微鏡写真であり、（ａ）は実施例１を示し、（ｂ）は実施例２を示し、（ｃ）は実施例３を示している。It is a microscope picture of the thick part structure | tissue of the cast iron manufactured by adding the inoculant of the Example of this invention, (a) shows Example 1, (b) shows Example 2, (c) is Example 3 is shown. 比較例の接種剤を添加して製造した鋳鉄の肉厚部組織の顕微鏡写真であり、（ａ）は比較例１を示し、（ｂ）は比較例２を示し、（ｃ）は比較例３を示している。It is a microscope picture of the thick part structure | tissue of the cast iron manufactured by adding the inoculant of a comparative example, (a) shows the comparative example 1, (b) shows the comparative example 2, (c) shows the comparative example 3 Is shown.

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, the form for implementing the inoculum for cast iron of this invention is demonstrated 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 according to the present invention contains at least one element of Ti, V, and Nb in an Fe-Si alloy, and Si is 70 to 75% by weight, Ti, V, and Nb. The total of any one or more elements is 0.5 to 6.0% by weight, and the remainder 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 inoculum for cast iron of the present invention is a powder, and the particle size of the inoculum varies depending on the addition time of the inoculum, but the average particle diameter is 0.1 to 10.0 mm. The later the inoculum is added, the smaller the particle size is. This is because if a large one is used just before casting, it remains undissolved, and if a very small one is used at the time of ladle, there is a problem that the ladle adheres to slag, melts quickly and is not effective. For example, if the inoculum is added in a pouring stream, it is preferably 0.25 to 1.0 mm. If it is added in the mold, it is more preferably less than 0.25 mm. If it exists, it is preferable to set it as 1.0-10.0 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％としたが、特に限定されるものではない。   In the inoculum for cast iron according to the present invention, the Fe-Si alloy contains any element of Ca and Al. The Ca content of the Fe-Si alloy used in the examples of the present invention is 2.2 to 2.3 wt%, and the Al content is 1.3 to 1.4 wt%, but is particularly limited. It is not a thing.

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 cast iron inoculant of the present invention has a Ti content of 0.5 to 2.0% by weight, and preferably 1.7 to 1.9% by weight. In the inoculum for cast iron of the present invention, the content of Ti is in such a range, when the content of Ti is less than 0.5% by weight, an increase in the number of graphite grains is not so much seen. This is because even when the Ti content exceeds 2.0% by weight, there is not much increase in the number of graphite grains beyond that, and excessive addition may cause spheroidization.

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 inoculum 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 inoculum for cast iron of the present invention, the V content is in such a range, when the V content is less than 0.5% by weight, the increase in the number of graphite grains is not so much seen. This is because even when the V content exceeds 2.0% by weight, the number of graphite grains is not increased so much, and excessive addition may cause spheroidization.

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 inoculum for cast iron of the present invention has a Nb content of 0.5 to 2.0% by weight, preferably 1.6 to 1.8% by weight. In the inoculum for cast iron of the present invention, the Nb content is set in such a range, when the Nb content is less than 0.5% by weight, the increase in the number of graphite grains is not so much seen. This is because even when the Nb content exceeds 2.0% by weight, the number of graphite grains is not much increased, and excessive addition may cause spheroidization.

（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 inoculum comprising Fe: 22.5 wt%, Si: 72.0 wt%, Ca: 2.3 wt%, Al: 1.4 wt%, Ti: 1.8 wt% And 0.1% by weight was added to the ductile cast iron melt. A cylindrical test piece was prepared from the inoculated molten metal by casting, and the inoculation prepared cast iron of Example 1 was obtained.

（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 inoculum comprising Fe: 22.8 wt%, Si: 71.6 wt%, Ca: 2.3 wt%, Al: 1.3 wt%, V: 1.9 wt% And 0.1% by weight was added to the ductile cast iron melt. A cylindrical test piece was prepared from the inoculated molten metal by casting to obtain inoculation 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 inoculum comprising Fe: 22.9 wt%, Si: 71.8 wt%, Ca: 2.2 wt%, Al: 1.4 wt%, Nb: 1.7 wt% And 0.1% by weight was added to the ductile cast iron melt. A cylindrical test piece was prepared from the inoculated molten metal by casting to obtain inoculation 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 inoculum comprising Fe: 25.8% by weight, Si: 72.3% by weight, Ca: 0.7% by weight, Al: 1.2% by weight was prepared, and the ductile cast iron melt was prepared. 0.1 wt% was added. A cylindrical test piece was prepared from the inoculated molten metal by casting to obtain an inoculation 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 inoculum comprising Fe: 23.6% by weight, Si: 72.8% by weight, Ca: 1.5% by weight, Al: 2.2% by weight was prepared, and the ductile cast iron melt was prepared. 0.1 wt% was added. A cylindrical test piece was prepared from the inoculated molten metal by casting to obtain inoculation 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 inoculum comprising Fe: 21.4% by weight, Si: 72.5% by weight, Ca: 3.9% by weight, and Al: 2.2% by weight was prepared. 0.1 wt% was added. A cylindrical test piece was prepared from the inoculated molten metal by casting to obtain inoculation 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 observation of the thick part structure of the inoculated prepared cast iron of Examples 1 to 3 obtained in this way with a microscope are as shown in the micrographs shown in FIGS. The numbers are 418 / mm 2 in Example 1, 416 / mm 2 in Example 2 , and 421 / mm 2 in Example 3, and the graphite spheroidization rate (JIS: NIK method) is as in Example 1. Was 95.1%, Example 2 was 95.0%, and Example 3 was 94.7%.
It was.

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。 Moreover, the result of having observed the thick part structure | tissue of the inoculation preparation cast iron of Comparative Examples 1-3 with a microscope is as the micrograph shown to Fig.2 (a)-(c), and the number of graphite grains is a 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, in Examples 1 to 3, the number of graphite particles is 400 pieces / mm 2 or more, and Comparative Examples 1 and 2 are only 280 pieces / mm 2. It was only 350 pieces / mm 2 , and the number of graphite grains in the examples of the present invention showed a clear significant difference in comparison with 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。   In addition, in the graphite spheroidization rate, the average value of Examples 1 to 3 was 95.0%, the average value of Comparative Examples 1 to 3 was 94.0%, and no obvious significant difference was observed. However, in comparison with Comparative Examples 1 and 2, the graphite spheroidization ratio of the example of the present invention was superior.

Claims (6)

Ｆｅ―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ていることを特徴とする鋳鉄用接種剤。   An inoculum for cast iron, wherein the Fe-Si alloy contains at least one element of Ti, V, and Nb. 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ことを特徴とする請求項１に記載の鋳鉄用接種剤。   Si is 70 to 75% by weight, and the total of any one or more elements of Ti, V, and Nb is 0.5 to 6.0% by weight, and the remainder is mainly composed of Fe. The inoculum for cast iron according to claim 1. 平均粒径が０．１〜１０．０ｍｍの粉末であるものとしていることを特徴とする請求項１または２に記載の鋳鉄用接種剤。     The inoculum for cast iron according to claim 1 or 2, wherein the powder has an average particle size of 0.1 to 10.0 mm. 前記Ｔｉの含有量が０．５〜２．０重量％であるものとしていることを特徴とする請求項１〜３のいずれかに記載の鋳鉄用接種剤。   The inoculum for cast iron according to any one of claims 1 to 3, wherein the Ti content is 0.5 to 2.0 wt%. 前記Ｖの含有量が０．５〜２．０重量％であるものとしていることを特徴とする請求項１〜３のいずれかに記載の鋳鉄用接種剤。   The inoculum for cast iron according to any one of claims 1 to 3, wherein the V content is 0.5 to 2.0 wt%. 前記Ｎｂの含有量が０．５〜２．０重量％であるものとしていることを特徴とする請求項１〜３のいずれかに記載の鋳鉄用接種剤。   The inoculum for cast iron according to any one of claims 1 to 3, wherein the Nb content is 0.5 to 2.0% by weight.
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