JP7178086B2 - Graphite spheroidizing agent for cast iron - Google Patents
Graphite spheroidizing agent for cast iron Download PDFInfo
- Publication number
- JP7178086B2 JP7178086B2 JP2018217928A JP2018217928A JP7178086B2 JP 7178086 B2 JP7178086 B2 JP 7178086B2 JP 2018217928 A JP2018217928 A JP 2018217928A JP 2018217928 A JP2018217928 A JP 2018217928A JP 7178086 B2 JP7178086 B2 JP 7178086B2
- Authority
- JP
- Japan
- Prior art keywords
- cast iron
- graphite
- spheroidizing agent
- weight
- spheroidizing
- 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.)
- Active
Links
Images
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Description
本発明は、炭素及びケイ素を所定量含有する鉄である鋳鉄中における炭素である黒鉛の粒数を増大させる球状化剤に関するものである。 TECHNICAL FIELD The present invention relates to a spheroidizing agent for increasing the number of graphite grains, which is carbon, in cast iron, which is iron containing predetermined amounts of carbon and silicon.
一般に、鋳鉄には炭素が約３～５重量％と多く含有されているために、組織中に黒鉛が晶出することとなり、その晶出した黒鉛の形状によって、鋳鉄の機械的物性が種々変化する。鋳鉄中に黒鉛が片状に晶出される鋳鉄は、ねずみ鋳鉄と呼ばれ、硬いが伸びがなく脆いが、鋳鉄中に黒鉛が球状に晶出されるように工夫された鋳鉄は、ダクタイル鋳鉄と呼ばれ、鋳鉄の靭性が向上するために自動車部品、水道管など種々の構造物に使用されている。そのため、鋳鉄中における球状黒鉛の粒数が増え散在されると、鋳鉄はより強靭化され、さらに用途が広がったり高い要求基準をクリアして高品質化できたりするので、球状黒鉛の粒数を増加させるような球状化剤が求められている。 In general, cast iron contains a large amount of carbon, about 3 to 5% by weight, so that graphite crystallizes in the structure, and the mechanical properties of cast iron vary depending on the shape of the crystallized graphite. do. Cast iron in which graphite crystallizes in flakes is called gray cast iron, and cast iron that is hard but brittle because it does not stretch is called ductile cast iron. It is used in various structures such as automobile parts and water pipes because it improves the toughness of cast iron. Therefore, if the number of spheroidal graphite grains in cast iron increases and they are scattered, the cast iron becomes tougher, and the range of applications expands and high quality can be achieved by meeting high standards. There is a need for spheronizing agents that increase the
また、鋳鉄中における黒鉛の球状化に付随して種々の課題を解決するために種々の黒鉛化球状処理剤が知られている。 Also, various graphitization spheroidizing agents are known to solve various problems associated with the spheroidization of graphite in cast iron.
例えば、特許文献１には、シリコン４０～５０％、マグネシウム４～５％、カルシウム０．５～１．５％、アルミニウム１～３％、レアアース０．５～１．５％、ジルコニウム０．２～１．０％、炭素０．５～３％、不可避の不純物、残部実質的に鉄の組成をもつ球状黒鉛鋳鉄用球状化剤されている。 For example, in Patent Document 1, silicon 40-50%, magnesium 4-5%, calcium 0.5-1.5%, aluminum 1-3%, rare earth 0.5-1.5%, zirconium 0.2% .about.1.0%, 0.5-3% carbon, unavoidable impurities, the balance being a nodular graphite cast iron spheroidizing agent with a composition substantially iron.
しかしながら、特許文献１に開示されている球状化剤は、球状化処理後の溶湯のチル化をより一層低減するために添加されるものとして開示されており、球状黒鉛の粒数を増加させる効果については明示されておらず、本願の解決課題とは明確に異なるものである。 However, the spheroidizing agent disclosed in Patent Document 1 is disclosed as being added to further reduce the chilling of molten metal after spheroidizing treatment, and has the effect of increasing the number of spheroidal graphite grains. is not specified, and is clearly different from the problem to be solved by the present application.
そこで、本発明では、上記課題を鑑み、鋳鉄中における黒鉛を球状化させるとともに、その球状黒鉛の粒数を増加させる鋳鉄用黒鉛球状化剤を提供することを目的とする。 Therefore, in view of the above problems, an object of the present invention is to provide a graphite spheroidizing agent for cast iron that spheroidizes graphite in cast iron and increases the number of spheroidal graphite grains.
〔１〕すなわち、本発明は、鋳鉄中における球状黒鉛の粒数を増加させるための球状 化剤であって、シリコンを３０～６０重量％、マグネシウムを４～３０重量％、ジルコ ニウムを０．１～１０重量％及び所定量の鉄を含有することを特徴とする鋳鉄用黒鉛球 状化剤である。 [1] That is, the present invention is a spheroidizing agent for increasing the number of spheroidal graphite particles in cast iron, comprising 30 to 60% by weight of silicon, 4 to 30% by weight of magnesium, and 0.0% of zirconium. A graphite spheroidizing agent for cast iron characterized by containing 1 to 10% by weight and a predetermined amount of iron.
〔２〕そして、レアアースを０．１～５重量％含有することを特徴とする請求項１に記載の鋳鉄用黒鉛球状化剤である。 [2] The graphite spheroidizing agent for cast iron according to [1], which contains 0.1 to 5% by weight of rare earth.
本発明によれば、鋳鉄中における黒鉛を球状化させるとともに、その球状黒鉛の粒数を増加させることができる。 According to the present invention, graphite in cast iron can be spheroidized and the number of spheroidal graphite grains can be increased.
以下、本発明に係る鋳鉄用黒鉛球状化剤に関して、詳しく説明する。なお、範囲を表す表現は上限と下限を含むものである。 Hereinafter, the graphite spheroidizing agent for cast iron according to the present invention will be described in detail. In addition, the expression representing the range includes the upper limit and the lower limit.
シリコン（Ｓｉ）：
本発明の鋳鉄用黒鉛球状化剤がフェロシリコン系の処理剤であり、シリコンは配合されるマグネシウムの濃度を低くし、マグネシウムの爆発的な反応を抑えるために配合されている。シリコンの配合割合は、３０～６０重量％であることが好ましく、４０～５０重量％であることが好ましい。シリコンの配合割合がこの範囲であると、鋳鉄用黒鉛球状化剤を安定に製造することができ、鋳鉄用黒鉛球状化剤の融点を下げて鋳鉄が溶融している溶湯に添加したときに鋳鉄用黒鉛球状化剤を融けやすくして他の成分を溶湯中に分散させることができ、また、鋳鉄用黒鉛球状化剤のコストを低減することができる。
Silicon (Si):
The graphite spheroidizing agent for cast iron of the present invention is a ferrosilicon-based treatment agent, and silicon is added to lower the concentration of magnesium to be blended and to suppress the explosive reaction of magnesium. The mixing ratio of silicon is preferably 30 to 60% by weight, more preferably 40 to 50% by weight. When the blending ratio of silicon is within this range, the graphite spheroidizing agent for cast iron can be stably produced. The graphite spheroidizing agent for cast iron can be easily melted to disperse other components in the molten metal, and the cost of the graphite spheroidizing agent for cast iron can be reduced.
マグネシウム（Ｍｇ）：
マグネシウムは、鋳鉄中の黒鉛を球状化するための有効成分である。マグネシウムの配合割合は、４～３０重量％であることが好ましく、１０～３０重量％であることが好ましい。マグネシウムの配合割合がこの範囲であると、鋳鉄用黒鉛球状化剤を溶湯に添加したときに黒鉛を確実に球状化することができ、さらに、マグネシウムの爆発的な反応を抑制して溶湯の飛散による歩留りの低下などを抑えることができる。
Magnesium (Mg):
Magnesium is an active ingredient for spheroidizing graphite in cast iron. The mixing ratio of magnesium is preferably 4 to 30% by weight, preferably 10 to 30% by weight. When the proportion of magnesium is within this range, the graphite can be reliably spheroidized when the graphite spheroidizing agent for cast iron is added to the molten metal, and the explosive reaction of magnesium is suppressed to prevent the molten metal from scattering. It is possible to suppress a decrease in yield due to
ジルコニウム（Ｚｒ）：
ジルコニウムは、鋳鉄中の球状化黒鉛の粒数を増加させるための有効成分であり、球状化剤に共存させることで、ジルコニウムの黒鉛粒数増大効果により、黒鉛の球状化を促進し、さらにそれによって黒鉛粒数増大を加速させる相乗効果があると考えられる。ジルコニウムの配合割合は、０．１～３重量％であることが好ましく、０．５０～２重量％であるこが好ましい。ジルコニウムの配合割合がこの範囲であると、鋳鉄用黒鉛球状化剤を溶湯に添加したときに得られる鋳鉄の靭性を損なわない程度に黒鉛が球状化されるとともに、球状化黒鉛の粒数を増加させることができる。
Zirconium (Zr):
Zirconium is an active ingredient for increasing the number of spheroidized graphite grains in cast iron. It is thought that there is a synergistic effect that accelerates the increase in the number of graphite grains. The blending ratio of zirconium is preferably 0.1 to 3% by weight, preferably 0.50 to 2% by weight. When the blending ratio of zirconium is within this range, the graphite is spheroidized to the extent that the toughness of the cast iron obtained when the graphite spheroidizing agent for cast iron is added to the molten metal is not impaired, and the number of spheroidized graphite grains is increased. can be made
レアアース（ＲＥ）：
レアアースは、鋳鉄中の黒鉛を球状化させるための補助などする成分であり、スカンジウム、イットリウムの２元素と、ランタンからルテチウムまでの原子番号の１５元素の総称である。レアアースの配合割合は、０．１～５重量％であることが好ましく、０．５～３重量％であることが好ましい。レアアースの配合割合がこの範囲であると、鋳鉄用黒鉛球状化剤を溶湯に添加したときに黒鉛の球状化を促進し、さらに、溶湯が凝固したときの引け量を抑えることができる。
Rare earth (RE):
Rare earth is a component that assists in spheroidizing graphite in cast iron, and is a general term for two elements, scandium and yttrium, and 15 elements with atomic numbers from lanthanum to lutetium. The rare earth content is preferably 0.1 to 5% by weight, more preferably 0.5 to 3% by weight. When the blending ratio of the rare earth is within this range, it is possible to promote the spheroidization of graphite when the graphite spheroidizing agent for cast iron is added to the molten metal, and to suppress the amount of shrinkage when the molten metal solidifies.
カルシウム（Ｃａ）：
カルシウムは、球状化処理時の反応を抑制する効果とともに、マグネシウムの球状化作用を補助する働きがある。０．５％未満ではその効果が得られず、６％を超えると、処理後にＣａ酸化物が大量に発生することになり、実用に適さない。
Calcium (Ca):
Calcium has the effect of suppressing the reaction during the spheroidizing treatment, and also has the function of assisting the spheroidizing action of magnesium. If it is less than 0.5%, the effect cannot be obtained, and if it exceeds 6%, a large amount of Ca oxide will be generated after the treatment, which is not suitable for practical use.
鉄（Ｆｅ）：
本発明の鋳鉄用黒鉛球状化剤の基材であり、シリコンと同様に、配合されるマグネシウムの濃度を低くし、マグネシウムの爆発的な反応を抑えることができる。
Iron (Fe):
It is the base material of the graphite spheroidizing agent for cast iron of the present invention, and like silicon, it can reduce the concentration of magnesium to be blended and suppress the explosive reaction of magnesium.
また、鋳鉄用黒鉛球状化剤は、不純物としてマンガン、リン、クロム、チタン、アルミニウム、スズなどが不可避的に混合されていてもよい。 In addition, manganese, phosphorus, chromium, titanium, aluminum, tin, and the like may be unavoidably mixed as impurities in the graphite spheroidizing agent for cast iron.
本発明の鋳鉄用黒鉛球状化剤は、溶湯に添加されるときには、上記の材料からなるソリッドワイヤーとして線状に形成されていたり、上記の材料が、薄い鋼板などで緊密に被覆されたコアードワイヤーとして線状に形成されていたりすることが好ましい。なお、コアードワイヤーとして線状に形成されているときには、被覆した鋼板も全体の重量として含まれ、各成分の割合は、各成分の配合量及び被覆した鋼板の重量の総量に対しての割合である。 When the graphite spheroidizing agent for cast iron of the present invention is added to the molten metal, it is formed in a linear form as a solid wire made of the above material, or a cored wire in which the above material is closely coated with a thin steel plate or the like. It is preferable that it is formed in a linear shape as. When the cored wire is formed linearly, the coated steel sheet is also included in the total weight, and the ratio of each component is the ratio to the total weight of the compounded amount of each component and the coated steel plate. be.
〔実施例１〕
Ｓｉ４７．６重量％、Ｍｇ２３．５重量％、Ｃａ２．８重量％、ＲＥ０．８重量％、Ｚｒ１．２重量％、不純物成分を含むＦｅＳｉＭｇ合金である球状化剤を充填したコアードワイヤーを作製した。
[Example 1]
A cored wire filled with a FeSiMg alloy containing 47.6% by weight of Si, 23.5% by weight of Mg, 2.8% by weight of Ca, 0.8% by weight of RE, 1.2% by weight of Zr, and an impurity component was produced.
そして、１００ｋｇの鋳鉄溶湯に、上記球状化剤を鋳鉄溶湯の０．４２％（４２０ｇ）添加した。そして添加処理した球状化剤含有鋳鉄溶湯から、カントバック分析用メダル試料および鋳造により円柱形状のテストピースを処理直後および７分経過後にそれぞれ採取した。 Then, 0.42% (420 g) of the spheroidizing agent was added to 100 kg of molten cast iron. A medal sample for Kantback analysis and a cylindrical test piece by casting were taken from the molten cast iron containing the spheroidizing agent immediately after the treatment and after 7 minutes, respectively.
〔比較例１〕
Ｓｉ４１．２重量％、Ｍｇ２４．６重量％、Ｃａ２．８重量％、ＲＥ０．８重量％、不純物成分を含むＦｅＳｉＭｇ合金である球状化剤を充填したコアードワイヤーを作製した。
[Comparative Example 1]
A cored wire filled with a FeSiMg alloy containing 41.2 wt% Si, 24.6 wt% Mg, 2.8 wt% Ca, 0.8 wt% RE and an impurity component as a spheroidizing agent was produced.
そして、１００ｋｇの鋳鉄溶湯に、上記球状化剤を鋳鉄溶湯の０．４２重量％（４２０ｇ）添加した。そして添加処理した球状化剤含有鋳鉄溶湯から、カントバック分析用メダル試料および鋳造により円柱形状のテストピースを処理直後および７分経過後にそれぞれ採取した。 Then, 0.42% by weight (420 g) of the spheroidizing agent was added to 100 kg of molten cast iron. A medal sample for Kantback analysis and a cylindrical test piece by casting were taken from the molten cast iron containing the spheroidizing agent immediately after the treatment and after 7 minutes, respectively.
＜球状黒鉛粒数＞
そして、このようにして得られた実施例のテストピース、比較例のテストピースの切断し断面を研磨後、顕微鏡を用いて研磨箇所を観察し組織画像を撮影した。この画像をＪＩＳ規格（ＪＩＳＧ５５０２：球状黒鉛鋳鉄品）に対応した黒鉛球状化測定ソフト（日鉄住金テクノロジー製）にて単位面積あたりの球状化黒鉛の粒数を計測した。合わせてその画像における黒鉛球状化率について、同ソフトを用いて計測した。これらの計測を５回行い、それらを算術平均した。
<Number of spherical graphite grains>
Then, after cutting and polishing the cross section of the test piece of the example and the test piece of the comparative example obtained in this manner, the polished portion was observed using a microscope and a tissue image was taken. The number of spheroidized graphite grains per unit area of this image was measured using graphite spheroidization measurement software (manufactured by Nippon Steel & Sumikin Technology) compliant with JIS standards (JIS G5502: spheroidal graphite cast iron). In addition, the graphite spheroidization rate in the image was measured using the same software. These measurements were taken 5 times and they were arithmetically averaged.
＜Ｍｇ歩留り＞
さらに実施例のカントバック分析用試料、比較例のカントバック分析用試料の成分分析を実施し、分析したMg値と溶湯重量からの積で求められる残留しているMg量に対して、ワイヤーにて溶湯へ投入したMg添加量で除して百分率とすることで、各Mg歩留まりの比率を算出した。
<Mg yield>
Furthermore, the component analysis of the sample for cantback analysis of the example and the sample for cantback analysis of the comparative example was performed, and the amount of residual Mg found in the product of the analyzed Mg value and the weight of the molten metal was found in the wire. The ratio of each Mg yield was calculated by dividing by the amount of Mg added to the molten metal to obtain a percentage.
上記実施例及び比較例における球状化剤の組成を表１に、そして、球状化黒鉛の粒数、球状化率、Mg歩留まりの結果をまとめて表２に示す。 Table 1 shows the composition of the spheroidizing agent in the above examples and comparative examples, and Table 2 shows the results of the number of spheroidized graphite particles, the spheroidization rate, and the Mg yield.
表２のように、実施例の球状化剤を用いた場合において、鋳鉄中における黒鉛が球状化されるとともに、比較例の球状化剤を用いた場合と比べるとその球状黒鉛の粒数が有意に増加していることが分かり、さらに、図１に示すように球状黒鉛が鋳鉄中に散在していることが分かった。また、Mgの歩留りに関して、実施例の球状化剤を用いた場合は、比較例の球状化剤を用いた場合よりも、添加直後においても高く、また、７分経過後において比較例の場合と同様に低下する傾向にあるが、その低下が抑制されるという効果も奏する。 As shown in Table 2, when the spheroidizing agents of the examples are used, the graphite in the cast iron is spheroidized, and the number of spheroidal graphite grains is significantly higher than when the spheroidizing agents of the comparative examples are used. Furthermore, as shown in FIG. 1, it was found that spheroidal graphite was scattered in the cast iron. Regarding the yield of Mg, when the spheroidizing agent of the example was used, it was higher than the case of using the spheroidizing agent of the comparative example even immediately after the addition, and after 7 minutes, it was higher than the case of the comparative example. Although it tends to decrease similarly, there is an effect that the decrease is suppressed.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018217928A JP7178086B2 (en) | 2018-11-21 | 2018-11-21 | Graphite spheroidizing agent for cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018217928A JP7178086B2 (en) | 2018-11-21 | 2018-11-21 | Graphite spheroidizing agent for cast iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2020084246A JP2020084246A (en) | 2020-06-04 |
| JP7178086B2 true JP7178086B2 (en) | 2022-11-25 |
Family
ID=70909683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2018217928A Active JP7178086B2 (en) | 2018-11-21 | 2018-11-21 | Graphite spheroidizing agent for cast iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP7178086B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7280711B2 (en) | 2019-02-26 | 2023-05-24 | キヤノンメディカルシステムズ株式会社 | Ultrasound diagnostic device, medical image processing device, and position information correction processing program |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3202639B2 (en) * | 1997-02-25 | 2001-08-27 | 中小企業総合事業団 | Method for spheroidizing spheroidal graphite cast iron |
-
2018
- 2018-11-21 JP JP2018217928A patent/JP7178086B2/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7280711B2 (en) | 2019-02-26 | 2023-05-24 | キヤノンメディカルシステムズ株式会社 | Ultrasound diagnostic device, medical image processing device, and position information correction processing program |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2020084246A (en) | 2020-06-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Tzeng et al. | Effects of scandium addition on iron-bearing phases and tensile properties of Al–7Si–0.6 Mg alloys | |
| RU2213796C2 (en) | High-temperature magnesium alloy | |
| Cui et al. | Influence of yttrium on microstructure and mechanical properties of as-cast Mg–5Li–3Al–2Zn alloy | |
| Chen et al. | Effects of combinative addition of lanthanum and boron on grain refinement of Al–Si casting alloys | |
| JP5923117B2 (en) | Metal alloy refinement method | |
| AU2006246965B2 (en) | Aluminium alloy | |
| Ii et al. | The constituents in Al–10Zn–2.5 Mg–2.5 Cu aluminum alloy | |
| Du et al. | Effect of La addition on the microstructure and mechanical properties of Mg–6 wt% Zn alloys | |
| JP2013529255A (en) | Aluminum alloy and aluminum alloy casting | |
| Majd et al. | Effect of RE elements on the microstructural and mechanical properties of as-cast and age hardening processed Mg–4Al–2Sn alloy | |
| Tian et al. | The microstructure and mechanical properties of Mg-3Al-3RE alloys | |
| Yarkadaş et al. | The effect of Cerium addition on microstructure and mechanical properties of high pressure die cast Mg-5Sn alloy | |
| Zhang et al. | Effect of Sc microalloying addition on microstructure and mechanical properties of as-cast Al–12Si alloy | |
| Dwivedi et al. | Influence of silicon content and heat treatment parameters on mechanical properties of cast Al–Si–Mg alloys | |
| JP2010189706A (en) | Spheroidal graphite cast iron tube and method for producing the same | |
| Qiu et al. | Effects of Mn and Sn on microstructure of Al-7Si-Mg alloy modified by Sr and Al-5Ti-B | |
| CA2943886C (en) | Aluminum alloy powder formulations with silicon additions for mechanical property improvements | |
| Razaq et al. | Influence of alloying elements Sn and Ti on the microstructure and mechanical properties of gray cast iron | |
| JP7178086B2 (en) | Graphite spheroidizing agent for cast iron | |
| Şevik et al. | The effect of strontium on the microstructure and mechanical properties of Mg–6Al–0.3 Mn–0.3 Ti–1Sn | |
| JP2011144443A (en) | Aluminum alloy for semisolid casting | |
| Silva et al. | Casting in the semi-solid state of ZK60 magnesium alloy modified with rare earth addition | |
| Açıkgöz et al. | Influence of silver addition on the microstructure and mechanical properties of squeeze cast Mg–6Al–1Sn–0.3 Mn–0.3 Ti | |
| JP6993646B2 (en) | Inoculant for cast iron | |
| Zhang et al. | Effects of in situ TiB2 particle on microstructures and mechanical properties of AZ91 alloy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20211026 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20220929 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20221004 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20221018 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20221026 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20221107 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 7178086 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |