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JPH0280505A - Production of spherical graphite pig iron - Google Patents

Production of spherical graphite pig iron

Info

Publication number
JPH0280505A
JPH0280505A JP1205566A JP20556689A JPH0280505A JP H0280505 A JPH0280505 A JP H0280505A JP 1205566 A JP1205566 A JP 1205566A JP 20556689 A JP20556689 A JP 20556689A JP H0280505 A JPH0280505 A JP H0280505A
Authority
JP
Japan
Prior art keywords
cast iron
usual
additive
inoculation
base
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.)
Pending
Application number
JP1205566A
Other languages
Japanese (ja)
Inventor
Jean-Claude Percheron
ジヤン‐クロード・ペルシユロン
Charles Defrancq
シヤルル・ドウフランク
Christian Dumont
クリステイアン・デユモン
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ferroglobe France SAS
Original Assignee
Pechiney Electrometallurgie SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pechiney Electrometallurgie SAS filed Critical Pechiney Electrometallurgie SAS
Publication of JPH0280505A publication Critical patent/JPH0280505A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C35/00Master alloys for iron or steel
    • 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

Landscapes

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

Abstract

PURPOSE: To simultaneously execute sphering and inoculation at the point of time later than usual, and to improve the productivity of a spheroidal graphite cast iron, by using an Fe-Si-Mg alloy added with Bi and rare earth metal as a single additive.
CONSTITUTION: At the time of producing the columnar of spheroidal graphite cast iron from a base cast iron of a base, base cast iron is treated at the point of time later than usual by using a single additive to simultaneously induce the sphering and inoculation. The alloy consisting, by weight %, 41 to 65% Si, 2 to 30% Mg, 0.1 to 4% Bi, 0.5 to 4% rare earths, <4% (each element) Ca, Ba and Sr, <1.5% Al and the balance Fe is used as the additive. For example, the pulverized additive is introduced to the cast iron gate of the inlet of casting molds. As a result, the need for inoculation is eliminated and since operation procedures and use materials are simplified, the cost is reduced.
COPYRIGHT: (C)1990,JPO

Description

【発明の詳細な説明】 1哩へ11光1 本発明は、接種を不要にする単一の球状化用添加剤を用
いて通常より遅い時点で鋳鉄を処理することにより、球
状黒鉛鋳鉄を製造する方法に係わる。
DETAILED DESCRIPTION OF THE INVENTION The present invention produces spheroidal graphite cast iron by treating the cast iron at a later point than usual with a single spheroidizing additive that eliminates the need for inoculation. It concerns the method of doing so.

正画ノと1遣− 球状黒鉛鋳鉄は、−船釣には、ベースの鋳鉄を先ず球状
化用添加剤(nodulizingadditive)
で処理し、次いで接種剤(inoculating a
gent)で処理することによって製造される。球状化
用添加剤は球状黒鉛を形成させる物質であり、通常はマ
グネシウムであり、例えば任意に希土類を含んだ鉄−ケ
イ素−マグネシウム合金形態である。接種剤は黒鉛の芽
晶作用(germination)を修正し、鋳鉄の脆
弱化につながるセメンタイトの形成を阻止する。
Spheroidal graphite cast iron - For boat fishing, the base cast iron is first treated with a nodulizing additive.
and then inoculating a
gent). The spheroidizing additive is a substance that causes the formation of spheroidal graphite, usually magnesium, for example in the form of an iron-silicon-magnesium alloy, optionally containing rare earths. The inoculant modifies the germination of graphite and prevents the formation of cementite, which leads to weakening of cast iron.

この接種剤は通常はケイ素をベースとし、例えば鉄−ケ
イ素合金からなる。
This inoculant is usually silicon-based, for example composed of an iron-silicon alloy.

周知のように、マグネシウムの効果が溶融鋳鉄温度で消
失することから、球状化処理の効果は長続きしない(数
分間)。従って、添加剤を加えたらすぐに鋳鉄を鋳型に
注入する必要がある。この要件は、容量が大きく且つ大
部分が自動化された現代の鋳造操作の条件には適合しな
い。というのも、処理した鋳鉄を大容量の自動化された
鋳造炉又は収り鍋内に長時間(例えば30分又は1時間
)保持しておくことは、望ましいことではあっても極め
て難しいからである。そこで、未処理鋳鉄を貯蔵してお
き、これを通常より遅れて、即ち鋳型内の部材の腔部に
注入する直前の短い時間の間に、球状化とそれに次ぐ接
種処理とにかける方法が提案されな。
As is well known, the effect of the nodularization process is short-lived (several minutes), since the effect of magnesium disappears at the temperature of molten cast iron. Therefore, it is necessary to pour the cast iron into the mold immediately after adding the additives. This requirement does not meet the requirements of modern foundry operations, which are large in volume and largely automated. This is because, although desirable, it is extremely difficult to maintain treated cast iron in a large-capacity automated foundry or holding pot for extended periods of time (e.g., 30 minutes or an hour). . Therefore, a method has been proposed in which untreated cast iron is stored and subjected to spheroidization and subsequent inoculation treatment at a later time than usual, i.e., for a short period of time immediately before injection into the cavity of the component in the mold. Not.

これらの「遅い時点での(tardy)j処理は主に2
つの異なるタイプの方法によって実施される。
These “tardy” processes are mainly 2
carried out by two different types of methods.

第1タイプの方法は鋳型内プロセス(in−mould
process)と称し、成形した断片又は粉砕した断
片を鋳鉄供給湯道に設けられた収容部に配置することか
らなる。
The first type of method is an in-mold process.
process) and consists of placing the shaped or crushed pieces into a receptacle provided in the cast iron supply runner.

第2タイプの方法は「ゲート(gate)Jプロセスと
称し、鋳鉄が自動的鋳造炉又は取り鍋から鋳型に注入さ
れる時に、比較的細かい粉末状にした1種類以上の添加
剤をゲート(湯口)に導入することからとなる。この第
2タイプの方法及びそのための装置は、例えば本出願人
の仏国特許第2588571号(US特許第47237
63号に対応)に開示されている。
The second type of process, referred to as the "gate J process," involves adding one or more additives in the form of a relatively fine powder to the cast iron as it is poured into the mold from an automatic casting furnace or ladle. This second type of method and device for it are described, for example, in the applicant's French Patent No. 2,588,571 (US Pat. No. 47,237).
(corresponding to No. 63).

このような方法及び装置を用いれば、前記添加操作を、
この操作によって生じ得るドロスを除去せしめる条件下
で連続的且つ調節的に行うことができる。
If such a method and apparatus are used, the addition operation can be performed by
This operation can be carried out continuously and in a controlled manner under conditions that allow for the removal of dross that may result from this operation.

本発明は鋳型内プロセスでもゲートプロセスでも実施す
ることができ、−船釣には、通常より遅れた時点で処理
を行う、即ち鋳鉄を鋳型内の部材の腔部に注入する直前
の短い時間内に処理する方法であればどんな方法でも実
施することができる。
The invention can be carried out in an in-mold process or in a gate process - for boat fishing, the process is carried out at a later point than usual, i.e. within a short period of time just before the cast iron is poured into the cavity of the part in the mold. Any method can be used as long as it processes the

免1へILL 本発明は、球状又は去状(vermicular)鋳鉄
の製造方法に係わる。この方法は、球状化及び接種作用
を同時に生起させる単一の添加剤によって、ベースの鋳
鉄を通常より遅い時点で処理することを特徴とする。前
記添加剤としてはビスマスと少なくとも1種類の希土類
金属とを加えた鉄−ケイ素マグネシウム合金を使用する
Back to Part 1 ILL The present invention relates to a method for producing spherical or vermicular cast iron. This method is characterized by treating the base cast iron at a later point in time than usual with a single additive that simultaneously produces a spheroidizing and inoculating action. The additive used is an iron-silicon magnesium alloy to which bismuth and at least one rare earth metal are added.

接種剤にビスマスを添加することは以前から推奨されて
きたことである。例えば、本出願人名義の仏国特許第2
511044号(=US特許第4432793号)には
、登録商標“5pherix”で知られている接種剤が
開示されている。これはケイ素70〜75%の鉄−ケイ
素合金であって、ビスマス、鉛又はアンチモンのうち少
なくとも1つを0.005〜3%含むと共に、少なくと
も1種類の希土類金属を0.005〜3%含む。
The addition of bismuth to inoculants has long been recommended. For example, the French patent No. 2 in the name of the applicant
No. 511,044 (=US Pat. No. 4,432,793) discloses an inoculant known under the registered trademark "5pherix". It is an iron-silicon alloy containing 70-75% silicon, 0.005-3% of at least one of bismuth, lead or antimony, and 0.005-3% of at least one rare earth metal. .

しかしながらこの処理は、第1段階で行われるマグネシ
ウムでの強制的球状化を補足するためのものである。
However, this treatment is intended to supplement the forced spheroidization with magnesium that takes place in the first stage.

KUSAK^名義の日本国特許出願KOKA I/J^
−59/43823は、球状化用添加剤にビスマス及び
セリウムを加えることを提案している。しかしながらこ
の場合も、後で鉄−ケイ素合金による接種を行わないと
、球状鋳鉄の特性を最適化することはできない。
Japanese patent application in the name of KUSAK^ KOKA I/J^
-59/43823 proposes adding bismuth and cerium to the spheroidizing additives. However, here too, the properties of the spheroidal cast iron cannot be optimized without subsequent inoculation with an iron-silicon alloy.

本発明は、厚みが数lと極めて薄い部材の場合でも黒鉛
球晶の数が多く且つ炭化物が全く存在しない球状鋳鉄を
、接種ステップを省略して直接製造できるようにする。
The present invention makes it possible to directly produce spheroidal cast iron with a large number of graphite spherulites and no carbides, even in the case of an extremely thin member with a thickness of several liters, by omitting the inoculation step.

このような結果は、下記の組成(重量%)をもつ添加剤
を使用することによって得られる:ケイ素=41〜65 マグネシウム= 2〜30 ビスマス:0.1〜4 希土類=0.5〜4 Ca、 Ba、 Sr:   <4(各元素)^l: 
       <1.5 鉄二       100の残り 「希土類」という用語は以後、ランタニド希土類元素群
から選択した少なくとも1種類の金属、特にセリウムを
意味すると理解されたい。尚、この金属は、他の同類金
属(例えばランタン)を該鉱石の起源と該鉱石が受けた
処理とに応じて決定される割合で任意に含み得る。
Such results are obtained by using additives with the following composition (% by weight): Silicon = 41-65 Magnesium = 2-30 Bismuth: 0.1-4 Rare earths = 0.5-4 Ca , Ba, Sr: <4 (each element) ^l:
<1.5 Iron2 100 Remainder The term "rare earth" is hereafter understood to mean at least one metal selected from the group of lanthanide rare earth elements, in particular cerium. It should be noted that this metal may optionally include other related metals (eg lanthanum) in proportions determined depending on the origin of the ore and the treatment to which it has been subjected.

先行技術の方法と異なり、本発明の方法では球状化と接
種とを組み合わせて単一の操作とし、この操作を通常よ
り遅い時点で行う。従って、操作手順及び使用物質が単
純化されるため、コストが節減され鋳造工場の生産性が
向上する。
Unlike prior art methods, the method of the present invention combines spheronization and inoculation into a single operation, which is usually performed at a later point in time. Therefore, operating procedures and materials used are simplified, resulting in cost savings and increased foundry productivity.

拝IJ1 本出願人の仏国特許出願第2588571号に記載の装
置を用いて本発明を実施した。この装置はその特定の形
状に鑑みてしばしば「サンドボックス(sand bo
x)」と称され、微粉状の添加剤を調節雰囲気下で直接
ゲートに導入できるようになっている。
IJ1 The invention was carried out using the apparatus described in the applicant's French Patent Application No. 2588571. Due to its particular shape, this device is often referred to as a "sandbox".
x), which allows the introduction of finely divided additives directly into the gate under a controlled atmosphere.

この装置で本発明の方法に従い、下記の最終組成(重量
%)をもつ球状鋳鉄を製造した:C:3.7、Si:2
.5、Mn:0.15、P:0.043、Mg:0.0
39この場合は、下記の組成(重量%)をもつ単一の球
状化−接種用添加剤と用いて、ベースの鋳鉄を遅い時点
で処理した: Si:48.2、Mg:6.1、TR:0.56、Bi
:0.33、Ca:0.44、^1:O,フ1、Fe:
残り。
Spheroidal cast iron with the following final composition (% by weight) was produced in this apparatus according to the method of the invention: C: 3.7, Si: 2.
.. 5, Mn: 0.15, P: 0.043, Mg: 0.0
39 In this case, the base cast iron was treated at a late point with a single nodulation-inoculation additive with the following composition (wt%): Si: 48.2, Mg: 6.1, TR: 0.56, Bi
:0.33, Ca:0.44, ^1:O, F1, Fe:
rest.

TRは主にセリウムからなり、通常セリウムに伴う他の
同類金属も含まれている。
TR consists primarily of cerium, with other related metals commonly associated with cerium also included.

比較テストとして、同じ鋳鉄を先行技術の方法により下
記の組成(重量%)をもつ従来の球状化用添加剤を用い
て製造した: Si:44.5、Mg:5.6、TR:0.6、Ca:
0.83、^I:1.21、Nn:0.37、鉄:残り
As a comparative test, the same cast iron was produced by prior art methods with conventional nodularizing additives having the following composition (% by weight): Si: 44.5, Mg: 5.6, TR: 0. 6.Ca:
0.83, ^I: 1.21, Nn: 0.37, iron: remainder.

ビスマス含量はゼロ、TR含量は前記と同じである。The bismuth content is zero and the TR content is the same as above.

どちらの場合も球状化用添加剤は鋳鉄の重量の1%の割
合で導入した。
In both cases the nodularizing additive was introduced at a rate of 1% of the weight of the cast iron.

比較テストでは、球状化の後で、ケイ素75%の鉄−ケ
イ素合金をベースとし鋳鉄の重量の0.2%に相当する
アルカリ土類金属をドープした接種剤により標準的接種
操作を行った。
In comparative tests, after spheronization, a standard inoculation procedure was carried out with an inoculant based on an iron-silicon alloy with 75% silicon and doped with an alkaline earth metal corresponding to 0.2% of the weight of the cast iron.

どちらの場合も鋳鉄は、1400℃の温度で直径3o、
20.12及び6II11のバーの形態に成形した。鋳
型はBeta Set砂で形成した。
In both cases, the cast iron has a diameter of 3o at a temperature of 1400℃,
20.12 and 6II11 bars. The mold was formed from Beta Set sand.

顕微鏡写真でこれらのバーの断面積ll112当たりの
黒鉛球品数を数え、それと同時に炭化物(セメンタイト
)Fe3Cの存在も調べた。
The number of graphite spheres per 112 cross-sectional areas of these bars was counted using micrographs, and at the same time, the presence of carbide (cementite) Fe3C was also investigated.

結果は下記の通りであった: これらの結果から明らかなように、本発明の方法で処理
した場合は黒鉛球品数が明らかに多い。
The results were as follows: As is clear from these results, the number of graphite spheres was clearly greater when treated by the method of the present invention.

また、本発明の方法では炭化物を含まない厚さ6輪輪の
製品の製造も極めて好ましい状態で実現されている。こ
れは、先行技術では殆ど不可能である。
Furthermore, the method of the present invention allows production of a six-wheeled product containing no carbide in an extremely favorable manner. This is almost impossible with the prior art.

従って、本発明の方法は厚みを少なくとも6mmまで薄
くした任意の鋳鉄製品の製造に使用できる。
The method of the invention can therefore be used to manufacture any cast iron product with a reduced thickness of at least 6 mm.

本発明を実施するためにベースの鋳鉄に添加すべき添加
剤の量は、鋳鉄中の2つの元素即ちマグネシウム及びビ
スマスの所期の最終含量に応じて決定する。最終含量は
通常、マグネシウムが平均0.025〜0.060重量
%、ビスマスが平均o、oos〜0.02重量%で十分
であると考えられる。従って、この範囲の最終含量を得
るためには、 これら2種 類の元素の揮発性を考慮して、 処理すべき鋳鉄の 重量の約1%で添加剤を導入すればよいことになる。
The amount of additives to be added to the base cast iron to carry out the invention depends on the desired final content of the two elements, namely magnesium and bismuth, in the cast iron. A final content of 0.025 to 0.060 wt. % magnesium and an average o,oos to 0.02 wt. % bismuth is usually considered sufficient. Therefore, in order to obtain a final content in this range, taking into account the volatility of these two elements, it is necessary to introduce the additive at approximately 1% of the weight of the cast iron to be treated.

Claims (3)

【特許請求の範囲】[Claims] (1)ベースの鋳鉄から虫状又は球状黒鉛鋳鉄を製造す
る方法であって、球状化剤及び接種剤として作用する下
記の重量%組成 ケイ素:41〜65 マグネシウム:2〜30 ビスマス:0.1〜4 希土類:0.5〜4 Ca、Ba、Sr:<4(各元素) アルミニウム:<1.5 鉄:残部 の単一添加剤により、通常より遅い時点で前記ベースの
鋳鉄を処理することを特徴とする方法。
(1) A method for producing worm-like or spheroidal graphite cast iron from base cast iron, comprising the following weight percent composition which acts as a spheroidizing agent and an inoculant: Silicon: 41-65 Magnesium: 2-30 Bismuth: 0.1 ~4 Rare earths: 0.5-4 Ca, Ba, Sr: <4 (each element) Aluminum: <1.5 Iron: Treating the base cast iron at a later point than usual with the remainder single additive A method characterized by:
(2)鋳型の入口の鋳鉄ゲートに粉砕した添加剤を導入
することによって、ベースの鋳鉄の通常より遅い時点で
の処理を行うことを特徴とする請求項1に記載の方法。
2. Process according to claim 1, characterized in that the treatment of the base cast iron is carried out at a later point than usual by introducing crushed additives into the cast iron gate at the entrance of the mold.
(3)いわゆる鋳型内法でベースの鋳鉄の通常より遅い
時点での処理を行うことを特徴とする請求項1に記載の
方法。
3. Process according to claim 1, characterized in that the base cast iron is treated at a later point than usual in a so-called in-mold process.
JP1205566A 1988-08-12 1989-08-08 Production of spherical graphite pig iron Pending JPH0280505A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8811190A FR2635534B1 (en) 1988-08-12 1988-08-12 PROCESS FOR OBTAINING SPHEROIDAL GRAPHITE FOUNDS
FR8811190 1988-08-12

Publications (1)

Publication Number Publication Date
JPH0280505A true JPH0280505A (en) 1990-03-20

Family

ID=9369501

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1205566A Pending JPH0280505A (en) 1988-08-12 1989-08-08 Production of spherical graphite pig iron

Country Status (8)

Country Link
EP (1) EP0357521B1 (en)
JP (1) JPH0280505A (en)
KR (1) KR930011403B1 (en)
BR (1) BR8904037A (en)
CA (1) CA1337148C (en)
DE (1) DE68906489T2 (en)
ES (1) ES2055140T3 (en)
FR (1) FR2635534B1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007506000A (en) * 2003-05-20 2007-03-15 プシニー・エレクトロムタルージー Inoculum containing bismuth and rare earth elements
JP2012036423A (en) * 2010-08-04 2012-02-23 Jfe Steel Corp Bi INOCULANT FOR SPHEROIDAL GRAPHITE CAST IRON AND METHOD FOR MANUFACTURING SPHEROIDAL GRAPHITE CAST IRON USING THE SAME
WO2015034062A1 (en) * 2013-09-06 2015-03-12 東芝機械株式会社 Method for spheroidizing molten metal of spheroidal graphite cast iron
WO2019142226A1 (en) 2018-01-16 2019-07-25 日産自動車株式会社 Internal combustion engine control method and internal combustion engine control device
CN111676383A (en) * 2020-06-09 2020-09-18 江苏亚峰合金材料有限公司 Vermiculizer for heat-resistant cast iron and preparation method thereof
US11396041B2 (en) 2018-12-27 2022-07-26 Hyundai Motor Company Method for manufacturing cast iron casting with fining graphite and suspension part

Families Citing this family (10)

* Cited by examiner, † Cited by third party
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DE3924558C1 (en) * 1989-07-25 1990-11-22 Skw Trostberg Ag, 8223 Trostberg, De
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JP2007506000A (en) * 2003-05-20 2007-03-15 プシニー・エレクトロムタルージー Inoculum containing bismuth and rare earth elements
JP4680913B2 (en) * 2003-05-20 2011-05-11 プシニー・エレクトロムタルージー Inoculum containing bismuth and rare earth elements
JP2012036423A (en) * 2010-08-04 2012-02-23 Jfe Steel Corp Bi INOCULANT FOR SPHEROIDAL GRAPHITE CAST IRON AND METHOD FOR MANUFACTURING SPHEROIDAL GRAPHITE CAST IRON USING THE SAME
WO2015034062A1 (en) * 2013-09-06 2015-03-12 東芝機械株式会社 Method for spheroidizing molten metal of spheroidal graphite cast iron
JPWO2015034062A1 (en) * 2013-09-06 2017-03-02 東芝機械株式会社 Spheroidal graphite cast iron melt spheroidizing method
WO2019142226A1 (en) 2018-01-16 2019-07-25 日産自動車株式会社 Internal combustion engine control method and internal combustion engine control device
US11396041B2 (en) 2018-12-27 2022-07-26 Hyundai Motor Company Method for manufacturing cast iron casting with fining graphite and suspension part
US11845125B2 (en) 2018-12-27 2023-12-19 Hyundai Motor Company Method for manufacturing cast iron casting with fining graphite and suspension part
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BR8904037A (en) 1990-03-20
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FR2635534B1 (en) 1992-04-03
EP0357521B1 (en) 1993-05-12
KR900003382A (en) 1990-03-26
FR2635534A1 (en) 1990-02-23
DE68906489T2 (en) 1993-09-09
CA1337148C (en) 1995-10-03
DE68906489D1 (en) 1993-06-17
ES2055140T3 (en) 1994-08-16

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