WO2016186094A1 - Method for processing molten cast iron - Google Patents

Method for processing molten cast iron Download PDF

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Publication number
WO2016186094A1
WO2016186094A1 PCT/JP2016/064548 JP2016064548W WO2016186094A1 WO 2016186094 A1 WO2016186094 A1 WO 2016186094A1 JP 2016064548 W JP2016064548 W JP 2016064548W WO 2016186094 A1 WO2016186094 A1 WO 2016186094A1
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Prior art keywords
cast iron
weight
molten metal
inoculum
inoculation
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PCT/JP2016/064548
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French (fr)
Japanese (ja)
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藤本 亮輔
本間 周平
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東芝機械株式会社
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Priority to KR1020177035909A priority Critical patent/KR102107888B1/en
Priority to JP2017519367A priority patent/JP6728150B2/en
Priority to DE112016002243.3T priority patent/DE112016002243T5/en
Priority to US15/575,044 priority patent/US20180148805A1/en
Priority to CN201680028691.3A priority patent/CN107532225B/en
Publication of WO2016186094A1 publication Critical patent/WO2016186094A1/en

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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00Refining of pig-iron; Cast iron
    • C21C1/10Making spheroidal graphite cast-iron
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00Treatment of fused masses in the ladle or the supply runners before casting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/20Measures not previously mentioned for influencing the grain structure or texture; Selection of compositions therefor
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00Refining of pig-iron; Cast iron
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00Refining of pig-iron; Cast iron
    • C21C1/10Making spheroidal graphite cast-iron
    • C21C1/105Nodularising additive agents
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D5/00Heat treatments of cast-iron
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/08Making cast-iron alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C37/00Cast-iron alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C37/00Cast-iron alloys
    • C22C37/04Cast-iron alloys containing spheroidal graphite
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C37/00Cast-iron alloys
    • C22C37/10Cast-iron alloys containing aluminium or silicon

Definitions

  • the present invention relates to a molten metal treatment method for cast iron (including both spheroidal graphite cast iron and flake graphite cast iron).
  • This molten metal treatment method includes inoculation treatment effective for improving the mechanical properties of thick cast iron (spheroidal graphite cast iron, flake graphite cast iron), among others.
  • Crystallization of abnormal graphite and coarse graphite can be avoided by increasing the number of eutectic cells by appropriate inoculation treatment. As the number of eutectic cells increases, the number of graphite grains and the graphite spheroidization ratio increase in spheroidal graphite cast iron, and the formation of fine A-type graphite is promoted in flake graphite cast iron. In either case, the mechanical properties are improved. Is done.
  • Patent Document 1 International Publication WO2015 / 034062A1 describes a spheroidizing method for molten metal when producing a thick spheroidal graphite cast iron product. The method disclosed here has room for further improvement in the refinement efficiency of graphite.
  • An object of the present invention is to provide a molten metal treatment method, particularly an inoculation method, which can suppress crystallization of abnormal graphite and coarse graphite and suppress deterioration of mechanical properties.
  • the present invention optimizes the amount of RE (rare earth, rare earth element), Ca (calcium), and Al (aluminum) added to the molten metal as a graphite nucleus compound in the inoculum. Suppresses abnormal graphite and coarse graphite that crystallize due to excessive graphitization.
  • inoculum As a graphite inoculum (hereinafter simply referred to as “inoculum”), 15 to 80% of Si and either La (lanthanum) or Ce (cerium), An inoculant containing Ca and Al, the balance being Fe (iron) and unavoidable impurities, was used, and the inoculant was added with each component element in the amount of RE (La or Ce): 0.001 to 0 0.009%, Ca: 0.001 to 0.02%, Al: 0.001 to 0.02%, and added to the molten metal.
  • RE La or Ce
  • the percentages indicating the content or the addition amount all mean% by weight unless otherwise specified.
  • RE, Ca, and Al exhibit graphitization and promote crystallization of abnormal graphite or coarse graphite.
  • crystallization of abnormal graphite and coarse graphite can be suppressed by optimizing the addition amount of RE, Ca, and Al as described above and using La or Ce alone as RE.
  • the added amount of Ca and Al is excessive, it not only promotes the crystallization of abnormal graphite or coarse graphite, but also promotes the formation of noro and dross.
  • the addition amount of Ca and Al as described above, a clean molten metal can be obtained, so that it is possible to suppress the occurrence of defects such as bite and pinholes in the product.
  • the material cost can be reduced, and the sensitivity to price fluctuations can be reduced.
  • Fig. 3 is a photograph of the structure of conventional spheroidal graphite cast iron.
  • Fig. 2 is a photograph of the structure of conventional flake graphite cast iron.
  • the inoculum used contains 15 to 80% Si, either La or Ce as RE, Ca and Al, and the balance Fe and unavoidable impurities.
  • the inoculum can be prepared by dissolving a predetermined amount (details will be described later) of RE, Ca, and Al in a molten Fe—Si alloy (ferrosilicon), solidifying the molten metal, and then crushing it into granules. .
  • the content of Si in the inoculum is 15 to 80% within this range, as is clear from the known Fe-Si phase diagram (see, for example, ASM HANDBOOK (trademark or registered trademark), Volume3, etc.). This is because the amount of Si dissolved increases. Further, when the Si content is 80% or more, other component elements are difficult to dissolve. Further, the Si content in the inoculant is preferably 15 to 25% or 50 to 60% in order to increase the amount of penetration.
  • the purity of Ce is preferably 80 to 100% by weight.
  • the purity of La is preferably 80 to 100% by weight.
  • the RE to be added is Ce
  • La does not exclude the inclusion of La that cannot be separated from Ce as an unavoidable impurity.
  • the amount of RE added to the molten metal is preferably 0.001 to 0.009%.
  • the amount of RE added is less than 0.001%, there is a problem that the number of eutectic cells is reduced in flake graphite cast iron, and in the case of spheroidal graphite cast iron, the neutralization ability of the graphite spheroidization inhibiting element is insufficient. The problem that a shape deteriorates arises.
  • the amount of RE exceeds 0.009%, there is no significant adverse effect in flake graphite cast iron, but nodular graphite cast iron has a problem that a lot of chunky graphite, which is abnormal graphite, is crystallized. When the graphite shape is deteriorated, it causes a decrease in mechanical properties.
  • the addition amount of Ca to the molten metal is preferably 0.001 to 0.020%, and similarly, the addition amount of Al to the molten metal is preferably 0.001 to 0.020%.
  • the addition amount of Ca and Al is less than 0.001, graphite nucleation is not sufficiently performed.
  • the addition amount of Ca and Al exceeds 0.020%, abnormal graphite or coarse graphite is likely to be crystallized, and noro and dross are likely to be generated, and the product may have a bite or pinhole defect. There is sex.
  • the above inoculum can be used when inoculating in the furnace just before the main hot water is discharged, and also the pouring method, hanging weir method, pouring flow inoculation method, in-mold method, wire treatment It can also be used for the implementation of all known methods of inoculation, such as the method.
  • the composition of the inoculum that can be suitably used for the pouring method, the hanging weir method, the pouring flow inoculation method, and the in-mold method is shown below.
  • Si 30-80% RE: 0.1 to 0.6% (purity 80 to 100% by weight La or Ce)
  • Ca 0.1 to 1.3%
  • Al 0.1 to 2.0% Remaining Fe and inevitable impurities
  • the composition of the inoculum that can be suitably used for the wire treatment method is shown below.
  • Si 30-60% RE: 0.3 to 1.8% (purity 80 to 100% by weight La or Ce)
  • Ca 0.1 to 6.0%
  • Al 0.1 to 6.0% Remaining Fe and inevitable impurities
  • the concentration of Fe and Si is kept low, and the concentration of other component elements is increased so that a sufficient inoculation effect can be achieved even with a small amount of wire feed. Therefore, the inoculation processing time can be shortened.
  • the amount of each element added to the molten metal is as described above.
  • the inoculum according to this embodiment does not contain Mg (magnesium). Therefore, when casting a spheroidal graphite cast iron product, the spheroidizing process is performed separately prior to the inoculation process using a spheroidizing agent different from the inoculum used for the inoculation process.
  • Mg which is an element contributing to spheroidization
  • the spheroidization treatment is performed with a separate spheronizing agent, and the inoculation effect can be enhanced by performing the inoculation treatment immediately after pouring into the mold after the spheronization treatment.
  • the above inoculum may be added to the molten metal.
  • Fig. 6 shows a schematic diagram of the pouring method.
  • the reaction groove (pocket) at the bottom of the ladle is filled with the inoculant, and the hot water at 1400-1500 ° C is poured into the ladle and inoculated. .
  • the above-mentioned inoculating agent can be disposed so as to cover the surface of the spheroidizing agent filled in the reaction groove, and can also be used as a cover agent that moderates the Mg reaction.
  • the amount of Mg added is large, the reaction becomes violent, but the reaction can be moderated by adding a large amount of Ca within the above optimum range (0.001 to 0.02 wt% with respect to the entire molten metal).
  • Fig. 7 shows a schematic diagram of the wire processing method.
  • the inoculation process can be efficiently performed in a short time by the wire process.
  • FIG. 8 shows a schematic diagram in which the hanging weir inoculation and in-mold inoculation are performed in combination. It is also possible to carry out only the weir inoculation or in-mold inoculation. Generally, the mechanical properties of the casting can be further improved by inoculating immediately before pouring the mold. Moreover, as shown in the schematic diagram of FIG. 9, the pouring flow inoculation and the hanging weir inoculation may be performed in combination.
  • inoculation of the molten metal in the ladle hanging weir inoculation, in-mold inoculation and pouring flow inoculation It is also preferable to inoculate the molten metal a plurality of times by combining the above, and by doing so, the mechanical properties of the casting can be further improved. In addition, when performing inoculation several times, it is made for the sum total of each component element with respect to a molten metal to be in the range mentioned above.
  • the casting temperature is preferably slightly lower, from 1280 to 1360 ° C., in order to ensure good mechanical properties of the casting.
  • the spheroidizing temperature is preferably 1400 to 1500 ° C.
  • a spheroidizing agent different from the inoculant was placed at the bottom of the reaction groove at the bottom of the ladle, and the spheroidizing treatment was performed together with the inoculation. No. 1 and 11 are no inoculation.
  • the addition amount of Ca is 0.003%, 0.012%, or 0.03%
  • the addition amount of Al is 0.003%, 0.012%, or 0.03%.
  • the amount of RE added was 0.002%, 0.008%, or 0.020%.
  • composition of the spheroidal graphite cast iron melt is C: 3.5 to 3.7%, Si: 2.4 to 2.6%, and Mn: 0.5 to 1.0%. C: 3.1-3.2%, Si: 1.5-1.7%, Mn: 0.8-0.9%.
  • the obtained test piece was subjected to a tensile test to measure the tensile strength and elongation at break, and the structure was observed.
  • Table 1 shows the test results.
  • Nos. 1 to 10 are spheroidal graphite cast iron
  • Nos. 11 to 20 are flake graphite cast iron.
  • Nos. 11 to 20 show the mechanical properties and conditions of flake graphite cast iron.
  • the amount of RE added is 0.02% even when there is no inoculation (No. 1), when RE is Ce + La (using misch metal as RE) (No. 2-4), and when RE is La alone or Ce alone In the case of (No. 7, 10), the tensile strength was less than 450 MPa. However, in other cases (No. 5, 6, 8, 9), that is, in the examples, the tensile strength was 450 MPa or more.
  • FIG. 1 is an example of the spheroidal graphite cast iron of the present invention
  • FIG. 2 is a photograph of the structure of the conventional spheroidal graphite cast iron
  • FIG. 3 is an example of flake graphite cast iron according to the present invention
  • FIG. 4 is a structural diagram photograph of flake graphite cast iron of a conventional example.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

This method for processing molten cast iron uses an inoculant that includes: 15-80 wt% of Si; as a rare earth element, either La of 80-100 wt% purity or Ce of 80-100 wt% purity; Ca; and Al; the remainder consisting of Fe and unavoidable impurities. The method includes a molten cast iron inoculation process, in which the inoculant is added to molten cast iron such that the amounts of the constituent elements added in relation to the molten cast iron are 0.001-0.009 wt% La or Ce, 0.001-0.02 wt% Ca, and 0.001-0.02 wt% Al.

Description

鋳鉄溶湯処理方法Cast iron melt processing method
 本発明は、鋳鉄(球状黒鉛鋳鉄及び片状黒鉛鋳鉄の両方を含む)の溶湯処理方法に関するものである。この溶湯処理方法には、とりわけ厚肉鋳鉄(球状黒鉛鋳鉄、片状黒鉛鋳鉄)の機械的性質を向上させるのに有効な接種処理が含まれる。 The present invention relates to a molten metal treatment method for cast iron (including both spheroidal graphite cast iron and flake graphite cast iron). This molten metal treatment method includes inoculation treatment effective for improving the mechanical properties of thick cast iron (spheroidal graphite cast iron, flake graphite cast iron), among others.
 球状黒鉛鋳鉄及び片状黒鉛鋳鉄の鋳造において、溶解炉から取鍋への出湯時、取鍋から鋳型への注湯時等に溶湯に接種処理を行うことにより、鋳鉄製品の機械的性質(引張強さ、伸び)を改善することが一般的に行われている。 In casting of spheroidal graphite cast iron and flake graphite cast iron, mechanical properties (tensiles) of cast iron products are obtained by inoculating the molten metal at the time of pouring from the melting furnace to the ladle, pouring from the ladle to the mold, etc. Strength, elongation) is generally improved.
 厚肉鋳鉄製品においては、黒鉛の晶出が起こる共晶凝固時間が長くなるため、金属組織中に異常黒鉛または粗大黒鉛が晶出しやすい。異常黒鉛または粗大黒鉛の晶出により、鋳鉄の引張強さが低下する。フェライト系球状黒鉛鋳鉄においては、異常黒鉛または粗大黒鉛の晶出により、材料の伸びが著しく低下する。 In thick cast iron products, the eutectic solidification time during which crystallization of graphite occurs becomes long, so abnormal graphite or coarse graphite tends to crystallize in the metal structure. Due to the crystallization of abnormal graphite or coarse graphite, the tensile strength of cast iron decreases. In ferritic spheroidal graphite cast iron, the elongation of the material is significantly reduced due to crystallization of abnormal graphite or coarse graphite.
 異常黒鉛及び粗大黒鉛の晶出は、適切な接種処理を行って共晶セルを増加させることにより回避することができる。共晶セルの増加に伴い、球状黒鉛鋳鉄においては黒鉛粒数及び黒鉛球状化率が増加し、片状黒鉛鋳鉄においては微細A型黒鉛の形成が促進され、いずれの場合も機械的性質が改善される。 Crystallization of abnormal graphite and coarse graphite can be avoided by increasing the number of eutectic cells by appropriate inoculation treatment. As the number of eutectic cells increases, the number of graphite grains and the graphite spheroidization ratio increase in spheroidal graphite cast iron, and the formation of fine A-type graphite is promoted in flake graphite cast iron. In either case, the mechanical properties are improved. Is done.
 比較的薄肉の鋳鉄製品を鋳造する場合、取鍋または掛け堰内で、Fe-Si(フェロシリコン)に、Ca(カルシウム)、Al(アルミニウム)、Ba(バリウム)、Bi(ビスマス)等を添加してなる接種剤を用いて接種処理することが良く知られている。 When casting cast iron products with relatively thin walls, Ca (calcium), Al (aluminum), Ba (barium), Bi (bismuth), etc. are added to Fe-Si (ferrosilicon) in a ladle or hanging weir. It is well known to inoculate using an inoculum.
 上述のように、厚肉の鋳鉄製品を鋳造するときには共晶凝固時間が長くなる。このため、共晶セルの増加作用だけでなく黒鉛化促進作用を有するCa、Al、Ba、Bi等を含む一般的な接種剤を厚肉の鋳鉄製品の鋳造に用いると、異常黒鉛(球状黒鉛鋳鉄の場合には「チャンキー黒鉛」)または粗大黒鉛が晶出する可能性がある。つまり、厚肉の鋳鉄製品の鋳造時には、共晶セル数を増加させつつ、必要以上の黒鉛化を抑制する必要がある。このため、黒鉛核生成物質としては希土類元素を用いることが好ましいと考えられる。 As mentioned above, the eutectic solidification time becomes longer when casting thick cast iron products. For this reason, when a general inoculant containing Ca, Al, Ba, Bi, etc. having not only an eutectic cell increasing action but also a graphitization promoting action is used for casting thick cast iron products, abnormal graphite (spherical graphite) In the case of cast iron, “chunky graphite”) or coarse graphite may crystallize. In other words, when casting a thick cast iron product, it is necessary to suppress graphitization more than necessary while increasing the number of eutectic cells. For this reason, it is considered preferable to use rare earth elements as the graphite nucleation substance.
 厚肉の片状黒鉛鋳鉄製品の鋳造において、上記の要求を十分に満足しうる希土類元素を含む接種剤を用いた溶湯処理方法は知られていない。特許文献1(国際公開WO2015/034062A1)には、厚肉の球状黒鉛鋳鉄製品を製造する際の溶湯の球状化処理方法が記載されている。ここに開示された方法は、黒鉛の微細化効率においてさらなる改善の余地がある。 In the casting of thick flake graphite cast iron products, there is no known melt treatment method using an inoculum containing rare earth elements that can sufficiently satisfy the above requirements. Patent Document 1 (International Publication WO2015 / 034062A1) describes a spheroidizing method for molten metal when producing a thick spheroidal graphite cast iron product. The method disclosed here has room for further improvement in the refinement efficiency of graphite.
国際公開WO2015/034062A1International Publication WO2015 / 034062A1
 本発明は、異常黒鉛及び粗大黒鉛の晶出を抑制し、機械的性質の低下を抑制することができる溶湯処理方法特に接種方法を提供することを目的としている。 An object of the present invention is to provide a molten metal treatment method, particularly an inoculation method, which can suppress crystallization of abnormal graphite and coarse graphite and suppress deterioration of mechanical properties.
 上記目的を達成するため、本発明では、接種剤中で黒鉛核の化合物となるRE(レアアース、希土類元素)、Ca(カルシウム)、Al(アルミニウム)の溶湯への添加量を最適化することにより、過剰な黒鉛化作用で晶出する異常黒鉛、粗大黒鉛を抑制する。 In order to achieve the above object, the present invention optimizes the amount of RE (rare earth, rare earth element), Ca (calcium), and Al (aluminum) added to the molten metal as a graphite nucleus compound in the inoculum. Suppresses abnormal graphite and coarse graphite that crystallize due to excessive graphitization.
 本発明の一実施形態による接種方法では、黒鉛接種剤(以下、単に「接種剤」と呼ぶ)として、15~80%のSiと、La(ランタン)またはCe(セリウム)のいずれか一方と、Caと、Alとを含み、残部Fe(鉄)及び不可避的不純物からなる接種剤を用い、この接種剤を、溶湯に対する各成分元素の添加量がRE(LaまたはCe):0.001~0.009%、Ca:0.001~0.02%、Al:0.001~0.02%となるように、溶湯に添加する。なお、本明細書において、含有量または添加量を示すパーセンテージは、特別な断り書きが無い限り、全て重量%を意味する。 In the inoculation method according to one embodiment of the present invention, as a graphite inoculum (hereinafter simply referred to as “inoculum”), 15 to 80% of Si and either La (lanthanum) or Ce (cerium), An inoculant containing Ca and Al, the balance being Fe (iron) and unavoidable impurities, was used, and the inoculant was added with each component element in the amount of RE (La or Ce): 0.001 to 0 0.009%, Ca: 0.001 to 0.02%, Al: 0.001 to 0.02%, and added to the molten metal. In the present specification, the percentages indicating the content or the addition amount all mean% by weight unless otherwise specified.
 共晶凝固時間が1.0ks以上になる厚肉鋳鉄においては、RE、Ca及びAlが黒鉛化作用を示し異常黒鉛または粗大黒鉛の晶出を助長する。しかしながら、上記のようにRE、Ca及びAlの添加量を最適化し、かつ、REとしてLaまたはCeを単独で用いることにより、異常黒鉛及び粗大黒鉛の晶出を抑制することができる。 In thick cast iron with a eutectic solidification time of 1.0 ks or longer, RE, Ca, and Al exhibit graphitization and promote crystallization of abnormal graphite or coarse graphite. However, crystallization of abnormal graphite and coarse graphite can be suppressed by optimizing the addition amount of RE, Ca, and Al as described above and using La or Ce alone as RE.
 Ca、Al添加量が過剰になると異常黒鉛または粗大黒鉛の晶出を助長するだけではなくノロ及びドロスの生成を助長する。しかしながら、上記のようにCa、Alの添加量を最適化することにより、清浄な溶湯が得られるので、製品にノロかみやピンホールなどの欠陥が生じることを抑制することができる。 If the added amount of Ca and Al is excessive, it not only promotes the crystallization of abnormal graphite or coarse graphite, but also promotes the formation of noro and dross. However, by optimizing the addition amount of Ca and Al as described above, a clean molten metal can be obtained, so that it is possible to suppress the occurrence of defects such as bite and pinholes in the product.
 また、高価かつ価格の安定性に不安が残るREの添加量を上記のように低めに抑えることにより、材料費を低減することができ、かつ、価格変動への感度を小さくすることができる。 Also, by suppressing the amount of RE that is expensive and remains unstable in price stability as described above, the material cost can be reduced, and the sensitivity to price fluctuations can be reduced.
本発明の実施例の球状黒鉛鋳鉄の組織図写真。The structure figure photograph of the spheroidal graphite cast iron of the example of the present invention. 従来例の球状黒鉛鋳鉄の組織図写真。Fig. 3 is a photograph of the structure of conventional spheroidal graphite cast iron. 本発明の実施例の片状黒鉛鋳鉄の組織図写真。The structure figure photograph of flake graphite cast iron of the example of the present invention. 従来例の片状黒鉛鋳鉄の組織図写真。Fig. 2 is a photograph of the structure of conventional flake graphite cast iron. 掛け堰法を示す概略図。Schematic which shows a hanging weir method. 置き注ぎ法を示す概略図。Schematic which shows the pouring method. ワイヤ処理法を示す概略図。Schematic which shows a wire processing method. 複合的に実施される掛け堰接種及びインモールド接種を示す概略図。Schematic which shows the hanging dam inoculation and in-mold inoculation implemented in combination. 複合的に実施される注湯流接種及び掛け堰接種を示す概略図。Schematic which shows the pouring flow inoculation and hanging dam inoculation implemented in combination.
 本発明の好適な実施形態について以下に説明する。 A preferred embodiment of the present invention will be described below.
 厚肉球状黒鉛鋳鉄で共晶凝固時間が1.0ks以上になるような鋳造品において、本発明の実施形態に係る溶湯処理方法、特に接種方法を用いることにより、異常黒鉛であるチャンキー黒鉛の晶出を抑制することができる。 In a cast product with eutectic solidification time of 1.0 ks or more with thick-walled spheroidal graphite cast iron, by using the molten metal treatment method according to the embodiment of the present invention, particularly the inoculation method, Crystallization can be suppressed.
 使用される接種剤は、15~80%のSiと、REとしてLaまたはCeのいずれか一方と、Caと、Alとを含み、残部Fe及び不可避的不純物からなる。 The inoculum used contains 15 to 80% Si, either La or Ce as RE, Ca and Al, and the balance Fe and unavoidable impurities.
 接種剤は、Fe-Si合金(フェロシリコン)溶湯に所定量(詳細後述)のRE、Ca及びAlを溶解させ、この溶湯を凝固させた後に、砕いて粒状にすることにより作製することができる。 The inoculum can be prepared by dissolving a predetermined amount (details will be described later) of RE, Ca, and Al in a molten Fe—Si alloy (ferrosilicon), solidifying the molten metal, and then crushing it into granules. .
 接種剤中のSiの含有量を15~80%とするのは、公知のFe-Si状態図(例えばASM HANDBOOK(商標または登録商標),Volume3等を参照)より明らかなように、この範囲内でSiの溶け込み量が多くなることによる。また、Siの含有量が80%以上の場合、他の成分元素が溶け込み難くなる。また、接種剤中のSiの含有量を15~25%または50~60%とすることが、溶け込み量を増やす上でさらに好ましい。 The content of Si in the inoculum is 15 to 80% within this range, as is clear from the known Fe-Si phase diagram (see, for example, ASM HANDBOOK (trademark or registered trademark), Volume3, etc.). This is because the amount of Si dissolved increases. Further, when the Si content is 80% or more, other component elements are difficult to dissolve. Further, the Si content in the inoculant is preferably 15 to 25% or 50 to 60% in order to increase the amount of penetration.
 REは、複数種のREの合金(例えば「ミッシュメタル」と呼ばれるCe:La=2:1の合金)または混合物の形態としてではなく、Ce(セリウム)のみ若しくはLa(ランタン)のみが単独で添加される。Ceのみ、あるいはLaのみを単独で適量添加することにより、優れた機械的性質が得られる。REとしてCeのみを用いる場合には、Ceの純度は80~100重量%とするのが好ましい。REとしてLaのみを用いる場合には、Laの純度は80~100重量%とするのが好ましい。上記成分規定は、例えば添加するREをCeとしたときに、添加するRE中にCeから分離しきれないLaが不可避的不純物として含まれることを排除するものではない。 RE is not an alloy of multiple types of RE (for example, an alloy of Ce: La = 2: 1 called “Misch metal”) or a mixture, but only Ce (cerium) or La (lanthanum) is added alone. Is done. By adding an appropriate amount of Ce alone or La alone alone, excellent mechanical properties can be obtained. When only Ce is used as RE, the purity of Ce is preferably 80 to 100% by weight. When only La is used as RE, the purity of La is preferably 80 to 100% by weight. For example, when the RE to be added is Ce, La does not exclude the inclusion of La that cannot be separated from Ce as an unavoidable impurity.
 REの溶湯に対する添加量は0.001~0.009%とすることが好ましい。REの添加量が0.001%未満の場合、片状黒鉛鋳鉄においては共晶セル数が減少するという問題が生じ、球状黒鉛鋳鉄においては黒鉛球状化阻害元素の中和能が不足して黒鉛形状が悪化するという問題が生じる。REの添加量が0.009%を超えた場合、片状黒鉛鋳鉄においては大きな悪影響はないが、球状黒鉛鋳鉄においては異常黒鉛であるチャンキー黒鉛が多く晶出するという問題が生じる。黒鉛形状が悪くなると、機械的性質低下の原因となる。 The amount of RE added to the molten metal is preferably 0.001 to 0.009%. When the amount of RE added is less than 0.001%, there is a problem that the number of eutectic cells is reduced in flake graphite cast iron, and in the case of spheroidal graphite cast iron, the neutralization ability of the graphite spheroidization inhibiting element is insufficient. The problem that a shape deteriorates arises. When the amount of RE exceeds 0.009%, there is no significant adverse effect in flake graphite cast iron, but nodular graphite cast iron has a problem that a lot of chunky graphite, which is abnormal graphite, is crystallized. When the graphite shape is deteriorated, it causes a decrease in mechanical properties.
 Caの溶湯に対する添加量は0.001~0.020%とすることが好ましく、また同様に、Alの溶湯に対する添加量は0.001~0.020%とすることが好ましい。Ca、Alの添加量が0.001未満では黒鉛核生成が十分に行われない。また、Ca、Alの添加量が0.020%を超えると、異常黒鉛または粗大黒鉛が晶出し易くなり、また、ノロ及びドロスが生成し易くなり、製品にノロかみやピンホールの欠陥が生じる可能性がある。 The addition amount of Ca to the molten metal is preferably 0.001 to 0.020%, and similarly, the addition amount of Al to the molten metal is preferably 0.001 to 0.020%. When the addition amount of Ca and Al is less than 0.001, graphite nucleation is not sufficiently performed. Also, if the addition amount of Ca and Al exceeds 0.020%, abnormal graphite or coarse graphite is likely to be crystallized, and noro and dross are likely to be generated, and the product may have a bite or pinhole defect. There is sex.
 上記の接種剤は、元湯を出湯する直前の炉内での接種を行うときに使用することができ、また、置き注ぎ法、掛け堰法、注湯流接種法、インモールド法、ワイヤ処理法などの公知の全ての接種方法の実施のために使用することもできる。 The above inoculum can be used when inoculating in the furnace just before the main hot water is discharged, and also the pouring method, hanging weir method, pouring flow inoculation method, in-mold method, wire treatment It can also be used for the implementation of all known methods of inoculation, such as the method.
 置き注ぎ法、掛け堰法、注湯流接種法及びインモールド法に好適に用いることができる接種剤の組成を以下に示す。
 Si:30~80%
 RE:0.1~0.6%(純度80~100重量%LaまたはCe)
 Ca:0.1~1.3%
 Al:0.1~2.0%
 残部Fe及び不可避的不純物
The composition of the inoculum that can be suitably used for the pouring method, the hanging weir method, the pouring flow inoculation method, and the in-mold method is shown below.
Si: 30-80%
RE: 0.1 to 0.6% (purity 80 to 100% by weight La or Ce)
Ca: 0.1 to 1.3%
Al: 0.1 to 2.0%
Remaining Fe and inevitable impurities
 ワイヤ処理法に好適に用いることができる接種剤の組成を以下に示す。
 Si:30~60%
 RE:0.3~1.8%(純度80~100重量%LaまたはCe)
 Ca:0.1~6.0%、
 Al:0.1~6.0%
 残部Fe及び不可避的不純物
 上記組成では、Fe、Siの濃度を低めに抑え、他の成分元素の濃度を高めにすることにより、ワイヤのフィード量が少なくても十分な接種効果を達成できるようになるので、接種処理時間を短縮することができる。
The composition of the inoculum that can be suitably used for the wire treatment method is shown below.
Si: 30-60%
RE: 0.3 to 1.8% (purity 80 to 100% by weight La or Ce)
Ca: 0.1 to 6.0%,
Al: 0.1 to 6.0%
Remaining Fe and inevitable impurities In the above composition, the concentration of Fe and Si is kept low, and the concentration of other component elements is increased so that a sufficient inoculation effect can be achieved even with a small amount of wire feed. Therefore, the inoculation processing time can be shortened.
 いずれの接種方法を用いる場合でも、また、いずれの組成の接種剤を用いる場合でも、溶湯に対する各成分元素の添加量は上述した通りとする。 Regardless of the inoculation method used or the inoculum of any composition, the amount of each element added to the molten metal is as described above.
 本実施形態に係る接種剤にはMg(マグネシウム)が含まれない。従って、球状黒鉛鋳鉄製品を鋳造する場合、球状化処理は、上記接種処理に用いる接種剤とは異なる球状化剤を用いて、上記接種処理に先行して別個に行われる。球状化処理に用いられる球状化剤は、公知のものから適当なものを選択して用いることができる。しかしながら、球状化剤はRE,Ca,Alを含まないもの、例えばFe-Si-Mg(例えば重量比でFe:Si:Mg=45:45:10、または30:30:20、または45:30:5のものなど)系のものを用いることが、上記接種処理への影響を最小限にする観点から好ましい。 The inoculum according to this embodiment does not contain Mg (magnesium). Therefore, when casting a spheroidal graphite cast iron product, the spheroidizing process is performed separately prior to the inoculation process using a spheroidizing agent different from the inoculum used for the inoculation process. The spheroidizing agent used for the spheroidizing treatment can be selected from known ones and used. However, the spheroidizing agent does not contain RE, Ca, or Al, such as Fe—Si—Mg (for example, Fe: Si: Mg = 45: 45: 10, or 30:30:20, or 45:30 in weight ratio). : Etc.) is preferable from the viewpoint of minimizing the influence on the inoculation process.
 接種処理は鋳型に溶湯を注湯する時点になるべく近い時点で行うことにより高い効果を得られることが知られており、本実施形態では、球状化に寄与する元素であるMgを接種剤に含めずに、球状化処理は別個の球状化剤により行い、球状化処理後、型に注湯する直前に接種処理を行うことにより、接種効果を高めることができる。 It is known that a high effect can be obtained by performing the inoculation process as close as possible to the time when the molten metal is poured into the mold. In this embodiment, Mg, which is an element contributing to spheroidization, is included in the inoculum. Instead, the spheroidization treatment is performed with a separate spheronizing agent, and the inoculation effect can be enhanced by performing the inoculation treatment immediately after pouring into the mold after the spheronization treatment.
 片状黒鉛鋳鉄製品を鋳造する場合には、溶湯に上記の接種剤を添加すればよい。 When casting flake graphite cast iron products, the above inoculum may be added to the molten metal.
 図6に置き注ぎ法の概略図を示す。一般的に多く使用されている置き注ぎ法に用いた場合、取鍋底部の反応溝(ポケット)に接種剤を充填し、1400~1500℃の元湯をこの取鍋に出湯して接種処理する。 Fig. 6 shows a schematic diagram of the pouring method. When used in the generally used pouring method, the reaction groove (pocket) at the bottom of the ladle is filled with the inoculant, and the hot water at 1400-1500 ° C is poured into the ladle and inoculated. .
 球状黒鉛鋳鉄の溶湯処理においては、上記の接種剤を反応溝に充填した球状化剤の表面を覆うように配置し、Mgの反応を穏やかにするカバー剤としても用いることができる。Mgの添加量が多いと反応が激しくなるが、Caを上記の最適範囲(溶湯全体に対して0.001~0.02重量%)内で多く入れることで反応を穏やかにすることができる。 In the melt treatment of spheroidal graphite cast iron, the above-mentioned inoculating agent can be disposed so as to cover the surface of the spheroidizing agent filled in the reaction groove, and can also be used as a cover agent that moderates the Mg reaction. When the amount of Mg added is large, the reaction becomes violent, but the reaction can be moderated by adding a large amount of Ca within the above optimum range (0.001 to 0.02 wt% with respect to the entire molten metal).
 図7にはワイヤ処理法の概略図を示す。ワイヤ処理によって短時間で効率的に接種処理を行うことができる。 Fig. 7 shows a schematic diagram of the wire processing method. The inoculation process can be efficiently performed in a short time by the wire process.
 図8には掛け堰接種及びインモールド接種を複合的に実施した概略図を示す。掛け堰接種またはインモールド接種のみを実施することも可能である。一般的には、鋳型への注湯直前に接種を行うことにより、鋳物の機械的性質をより一層に改善することができる。また、図9の概略図に示すように、注湯流接種と掛け堰接種とを複合的に実施してもよい。 FIG. 8 shows a schematic diagram in which the hanging weir inoculation and in-mold inoculation are performed in combination. It is also possible to carry out only the weir inoculation or in-mold inoculation. Generally, the mechanical properties of the casting can be further improved by inoculating immediately before pouring the mold. Moreover, as shown in the schematic diagram of FIG. 9, the pouring flow inoculation and the hanging weir inoculation may be performed in combination.
 また、溶解炉から取鍋への出湯後から、鋳型への注湯が完了するまでの間に、取鍋内の溶湯への接種、掛け堰接種、インモールド接種及び注湯流接種の2つ以上を組み合わせて複数回溶湯に接種することも好ましく、そうすることにより、鋳物の機械的性質をより一層改善することができる。なお、複数回の接種を行う場合には、溶湯に対する各成分元素の合計が、前述した範囲内となるようにする。 In addition, after pouring from the melting furnace to the ladle and until the pouring of the mold is completed, there are two types: inoculation of the molten metal in the ladle, hanging weir inoculation, in-mold inoculation and pouring flow inoculation It is also preferable to inoculate the molten metal a plurality of times by combining the above, and by doing so, the mechanical properties of the casting can be further improved. In addition, when performing inoculation several times, it is made for the sum total of each component element with respect to a molten metal to be in the range mentioned above.
 上述した接種処理(球状黒鉛鋳鉄の場合は接種処理に加えて球状化処理)が行われた溶湯を1300~1400℃で鋳型に注湯することが好ましく、そうすることにより良好な機械的性質を有した厚肉鋳物が得られる。鋳物の形状については特に制限はないが、上述した実施形態に係る接種方法は、共晶凝固時間が1.0ks以上になるような肉厚を有する場合に、特に優れた効果を示す。鋳物がより大型または厚肉で共晶凝固時間がより長くなる場合には、鋳込み温度は、やや低めの1280~1360℃とすることが、鋳物の良好な機械的性質を確保する上で好ましい。なお、球状黒鉛鋳鉄の場合には、球状化処理温度1400~1500℃とすることが好ましい。 It is preferable to pour the molten metal that has been subjected to the above inoculation treatment (in the case of spheroidal graphite cast iron in addition to the inoculation treatment) into a mold at 1300 to 1400 ° C., so that good mechanical properties can be obtained. A thick casting having the thickness is obtained. Although there is no restriction | limiting in particular about the shape of a casting, The inoculation method which concerns on embodiment mentioned above shows a particularly outstanding effect, when it has thickness that eutectic solidification time will be 1.0 ks or more. If the casting is larger or thicker and the eutectic solidification time is longer, the casting temperature is preferably slightly lower, from 1280 to 1360 ° C., in order to ensure good mechanical properties of the casting. In the case of spheroidal graphite cast iron, the spheroidizing temperature is preferably 1400 to 1500 ° C.
 本発明の実施例としての接種剤と、比較例としての接種剤をそれぞれ用いた片状黒鉛鋳鉄品及び球状黒鉛鋳鉄品の鋳造実験を行った。この実験では、共晶凝固時間が1.2ksとなるように設計された肉厚100mmの試験片を鋳造するための鋳型を用いた。このように共晶凝固時間が長いと、異常黒鉛及び粗大黒鉛が晶出しやすいので、接種の効果を検証するのに適している。 Casting experiments were conducted on flake graphite cast iron products and spheroidal graphite cast iron products using the inoculant as an example of the present invention and the inoculant as a comparative example, respectively. In this experiment, a mold for casting a test piece having a thickness of 100 mm designed to have a eutectic solidification time of 1.2 ks was used. Thus, when eutectic solidification time is long, abnormal graphite and coarse graphite are likely to be crystallized, which is suitable for verifying the effect of inoculation.
 実験では、先に説明したように、Fe-50%Si合金(フェロシリコン)溶湯に所定量(詳細後述)のRE、Ca及びAlを溶解させ、この溶湯を凝固させた後に、砕いて粒状にすることにより作製した接種剤を用いた。この接種剤を、 元湯30kgに対して、溶湯(元湯)に対する添加量が下記の表1のNo.1~20にそれぞれ記載された通りになるように、掛け堰法を用いて添加した。球状黒鉛鋳鉄品を鋳造するときには、取鍋の底の反応溝の底部に接種剤とは別の球状化剤を配置し、球状化処理を接種と併せて行った。No.1,11は接種無しである。接種有りの試験片において、Caの添加量は0.003%、0.012%、0.03%のいずれか、Alの添加量は0.003%、0.012%、0.03%のいずれか、REの添加量は0.002%、0.008%、0.020%のいずれかとした。 In the experiment, as described above, a predetermined amount (details will be described later) of RE, Ca, and Al is dissolved in a molten Fe-50% Si alloy (ferrosilicon), and the molten metal is solidified and then crushed into granules. The inoculum prepared by doing was used. The amount of this inoculum added to the molten metal (Motoyu) with respect to 30 kg of Motoyu is No. 1 in Table 1 below. They were added using the hanging weir method as described in 1 to 20 respectively. When casting a spheroidal graphite cast iron product, a spheroidizing agent different from the inoculant was placed at the bottom of the reaction groove at the bottom of the ladle, and the spheroidizing treatment was performed together with the inoculation. No. 1 and 11 are no inoculation. In the test piece with inoculation, the addition amount of Ca is 0.003%, 0.012%, or 0.03%, and the addition amount of Al is 0.003%, 0.012%, or 0.03%. In any case, the amount of RE added was 0.002%, 0.008%, or 0.020%.
 球状黒鉛鋳鉄溶湯の組成は、C:3.5~3.7%、Si:2.4~2.6%、Mn:0.5~1.0%であり、片状黒鉛鋳鉄溶湯の組成はC:3.1~3.2%、Si:1.5~1.7%、Mn:0.8~0.9%であった。 The composition of the spheroidal graphite cast iron melt is C: 3.5 to 3.7%, Si: 2.4 to 2.6%, and Mn: 0.5 to 1.0%. C: 3.1-3.2%, Si: 1.5-1.7%, Mn: 0.8-0.9%.
 得られた試験片に対して、引張試験を行い、引張強さ及び破断伸びを測定するとともに、組織観察を行った。 The obtained test piece was subjected to a tensile test to measure the tensile strength and elongation at break, and the structure was observed.
 表1に試験結果を示す。
Figure JPOXMLDOC01-appb-T000001
Table 1 shows the test results.
Figure JPOXMLDOC01-appb-T000001
 表1のNo.1~10は球状黒鉛鋳鉄、No.11~20は片状黒鉛鋳鉄である。No.11~20には片状黒鉛鋳鉄の機械的性質と条件を示す。 In Table 1, Nos. 1 to 10 are spheroidal graphite cast iron, and Nos. 11 to 20 are flake graphite cast iron. Nos. 11 to 20 show the mechanical properties and conditions of flake graphite cast iron.
 球状黒鉛鋳鉄の引張強さについて以下のことが確認された。接種なしの場合(No.1)、REがCe+La(REとしてミッシュメタルを使用)の場合(No.2-4)、並びにREがLa単独またはCe単独の場合でもRE添加量が0.02%の場合(No.7,10)には引張強さが450MPaを下回っていた。しかしながら、その他の場合(No.5,6,8,9)つまり実施例では、引張強さが450MPa以上であった。 The following was confirmed for the tensile strength of spheroidal graphite cast iron. The amount of RE added is 0.02% even when there is no inoculation (No. 1), when RE is Ce + La (using misch metal as RE) (No. 2-4), and when RE is La alone or Ce alone In the case of (No. 7, 10), the tensile strength was less than 450 MPa. However, in other cases (No. 5, 6, 8, 9), that is, in the examples, the tensile strength was 450 MPa or more.
 球状黒鉛鋳鉄の伸びについて以下のことが確認された。REとしてLaを単独またはCeを単独で添加し、かつ、RE、Ca、Al添加量を低めに押さえた場合(No.5,6,8,9)つまり実施例は、比較例(No.1、2-4,7,10)よりも大幅に高い伸びを示した。 The following was confirmed for the elongation of spheroidal graphite cast iron. In the case where La is added alone or Ce is added alone as RE, and the addition amount of RE, Ca, Al is kept low (No. 5, 6, 8, 9), that is, the examples are comparative examples (No. 1). , 2-4, 7, 10).
 片状黒鉛鋳鉄の引張強に関しては以下のことが確認された。いずれの試料も300MPa以上の引張強さを示した。接種を行うことにより引張強さの増加が認められた。RE、Ca、Alの添加量が同じもの同士を比較すると、REをミッシュメタルの形態で添加したものよりも、REとしてLaを単独またはCeを単独で添加したものの方が、高い引張強度を示した。REとしてLaを単独で添加したもの同士を比較すると、RE、Ca、Al添加量が高いもの(No.17)よりも、RE、Ca、Al添加量を低めに抑えたもの(No.15,16)の方が、高い引張強度を示した。REとしてCeを単独で添加したもの同士を比較すると、RE、Ca、Al添加量が高いもの(No.20)よりも、RE、Ca、Al添加量を低めに抑えたもの(No.18,19)の方が、高い引張強度を示した。片状黒鉛鋳鉄の伸びについては、接種の有無、RE、Ca、Al添加量による差は殆どなかった。 Regarding the tensile strength of flake graphite cast iron, the following was confirmed. All samples showed a tensile strength of 300 MPa or more. An increase in tensile strength was observed by inoculation. Comparing RE, Ca, and Al with the same amount of addition, higher tensile strength is obtained when RE is added as La alone or Ce alone than RE is added in the form of misch metal. It was. Comparing those in which La was added alone as RE, the amount of RE, Ca, Al added was suppressed lower than that in which RE, Ca, and Al were added in a high amount (No. 17) (No. 15, 16) showed higher tensile strength. Comparing those in which Ce was added alone as RE, compared to those in which RE, Ca and Al were added in a high amount (No. 20), those in which RE, Ca and Al were added to a lower amount (No. 18, 19) showed higher tensile strength. As for the elongation of flake graphite cast iron, there was almost no difference depending on the presence or absence of inoculation and the addition amount of RE, Ca, and Al.
 図1は本発明の球状黒鉛鋳鉄の実施例、図2は従来例の球状黒鉛鋳鉄の組織図写真である。図3は本発明の片状黒鉛鋳鉄の実施例、図4は従来例の片状黒鉛鋳鉄の組織図写真である。接種を行うことにより球状黒鉛鋳鉄の黒鉛粒数は増加し、片状黒鉛鋳鉄の黒鉛組織は微細化されている。RE、Ca、Alを最適量にした接種剤を使用することにより組織の改善が確認できた。 FIG. 1 is an example of the spheroidal graphite cast iron of the present invention, and FIG. 2 is a photograph of the structure of the conventional spheroidal graphite cast iron. FIG. 3 is an example of flake graphite cast iron according to the present invention, and FIG. 4 is a structural diagram photograph of flake graphite cast iron of a conventional example. By performing the inoculation, the number of graphite grains of spheroidal graphite cast iron is increased, and the graphite structure of flake graphite cast iron is refined. Improvement of tissue could be confirmed by using an inoculum with optimum amounts of RE, Ca, and Al.

Claims (10)

  1.  接種剤として、15~80重量%のSiと、REとして純度80~100重量%のLaまたは純度80~100重量%Ceのいずれか一方と、Caと、Alとを含み、残部Fe及び不可避的不純物からなる接種剤を用い、前記接種剤を、鋳鉄の溶湯に対する各成分元素の添加量がLaまたはCeを0.001~0.009重量%、Caを0.001~0.02重量%、Alを0.001~0.02重量%となるように前記溶湯に添加することにより前記鋳鉄の溶湯に接種処理を行うことを含む、鋳鉄溶湯処理方法。 As an inoculum, it contains 15 to 80% by weight of Si, RE has a purity of either 80 to 100% by weight of La or a purity of 80 to 100% by weight of Ce, Ca and Al, the balance being Fe and inevitable Using an inoculant composed of impurities, the inoculum contains La or Ce in an amount of 0.001 to 0.009% by weight, Ca in an amount of 0.001 to 0.02% by weight, A cast iron molten metal treatment method comprising inoculating the molten metal of the cast iron by adding Al to the molten metal in an amount of 0.001 to 0.02% by weight.
  2.  前記接種剤におけるSiの含有量が30~80%、純度80~100重量%のLaまたは純度80~100重量%Ceの含有量が0.1~0.6重量%、Caの含有量が0.1~1.3重量%、Alの含有量が0.1~2.0重量%である、請求項1記載の鋳鉄溶湯処理方法。 In the inoculum, the Si content is 30 to 80%, the purity is 80 to 100% by weight La or the purity is 80 to 100% by weight Ce is 0.1 to 0.6% by weight, and the Ca content is 0. The cast iron molten metal treatment method according to claim 1, wherein the cast iron melt has a content of 0.1 to 1.3% by weight and an Al content of 0.1 to 2.0% by weight.
  3.  前記接種剤におけるSiの含有量が30~60%、純度80~100重量%のLaまたは純度80~100重量%Ceの含有量が0.3~1.8重量%、Caの含有量が0.1~6.0重量%、Alの含有量が0.1~6.0重量%である、請求項1記載の鋳鉄溶湯処理方法。 In the inoculum, the Si content is 30 to 60%, the purity is 80 to 100% by weight La or the purity is 80 to 100% by weight Ce is 0.3 to 1.8% by weight, and the Ca content is 0. 2. The cast iron molten metal treatment method according to claim 1, wherein the molten iron has a content of 0.1 to 6.0% by weight and an Al content of 0.1 to 6.0% by weight.
  4.  前記接種剤は、粒径1~5mmの粒状である、請求項1から請求項3のいずれか一項に記載の鋳鉄溶湯処理方法。 The cast iron molten metal treatment method according to any one of claims 1 to 3, wherein the inoculum is granular with a particle diameter of 1 to 5 mm.
  5.  前記接種剤は、長さが5~70mmの塊状である、請求項1から請求項3のいずれか一項に記載の鋳鉄溶湯処理方法。 The cast iron molten metal treatment method according to any one of claims 1 to 3, wherein the inoculum is a lump having a length of 5 to 70 mm.
  6.  前記接種剤は、粒径が0.1~1.0mmの粒からなり、前記粒がワイヤの芯部に連続的に包含された状態で溶湯に供給される、請求項1から請求項3のいずれか一項に記載の鋳鉄溶湯処理方法。 The inoculum comprises particles having a particle size of 0.1 to 1.0 mm, and is supplied to the molten metal in a state where the particles are continuously included in the core of the wire. The cast iron molten metal processing method as described in any one of Claims.
  7.  前記接種剤とは異なる別の球状化剤を用いて黒鉛球状化処理を行うことをさらに含み、前記黒鉛球状化処理の処理温度が1400~1500℃、鋳型への注湯温度が1270~1370℃である、請求項1から請求項6のいずれか一項に記載の鋳鉄溶湯処理方法。 The method further includes performing a graphite spheroidizing treatment using another spheroidizing agent different from the inoculant, wherein the graphite spheroidizing treatment temperature is 1400-1500 ° C., and the pouring temperature of the mold is 1270-1370 ° C. The cast iron molten metal treatment method according to any one of claims 1 to 6, wherein
  8.  1回の鋳造に対して請求項1から請求項6のいずれかに記載の接種剤を用い、置き注ぎ法で球状化処理および接種した後に、取鍋、掛け堰、鋳型内のいずれか1か所以上でさらに1回以上前記接種剤を用い接種を行う、鋳鉄溶湯処理方法。 The inoculum according to any one of claims 1 to 6 is used for one casting, and after spheroidizing treatment and inoculation by a pouring method, any one of a ladle, a hanging weir, and a mold A cast iron melt treatment method in which the inoculum is further inoculated once or more at a place or more.
  9.  複数回接種を行う方法として、鋳型への注湯時に行う注湯流接種、インモールド接種、掛け堰接種を組み合わせた、請求項8記載の鋳鉄溶湯処理方法。 The cast iron molten metal treatment method according to claim 8, wherein as a method for inoculating a plurality of times, a pouring flow inoculation, an in-mold inoculation, and a hanging weir inoculation performed when pouring into a mold are combined.
  10.  前記接種剤による接種処理とは別に、マグネシウムを含む球状化処理剤を用いて球状化処理を行う、請求項1から9のいずれか一項に記載の鋳鉄溶湯処理方法。 The cast iron molten metal treatment method according to any one of claims 1 to 9, wherein a spheroidizing treatment is performed using a spheroidizing treatment agent containing magnesium separately from the inoculating treatment with the inoculating agent.
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