EP0175934B1 - Impflegierung auf Basis von Ferrosilicium oder Silicium und Verfahren zu ihrer Herstellung - Google Patents

Impflegierung auf Basis von Ferrosilicium oder Silicium und Verfahren zu ihrer Herstellung Download PDF

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Publication number
EP0175934B1
EP0175934B1 EP85110607A EP85110607A EP0175934B1 EP 0175934 B1 EP0175934 B1 EP 0175934B1 EP 85110607 A EP85110607 A EP 85110607A EP 85110607 A EP85110607 A EP 85110607A EP 0175934 B1 EP0175934 B1 EP 0175934B1
Authority
EP
European Patent Office
Prior art keywords
barium
alloy
zirconium
silicon
seeding
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.)
Expired
Application number
EP85110607A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0175934A1 (de
Inventor
Heinz Bruckmann
Friedrich Wolfsgruber
Ernst Anton Weiser
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.)
Evonik Operations GmbH
Original Assignee
SKW Trostberg AG
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 SKW Trostberg AG filed Critical SKW Trostberg AG
Publication of EP0175934A1 publication Critical patent/EP0175934A1/de
Application granted granted Critical
Publication of EP0175934B1 publication Critical patent/EP0175934B1/de
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C35/00—Master alloys for iron or steel
    • C22C35/005—Master alloys for iron or steel based on iron, e.g. ferro-alloys

Definitions

  • the present invention relates to an inoculation alloy based on ferrosilicon or silicon for the production of cast iron with lamellar, compact or spheroidal graphite and a method for the production thereof.
  • cast iron contains carbon in an amount of approximately 2 to 4% as the main alloying element.
  • certain modification alloy such.
  • B. Magnesium succeeds in converting the carbon into compact or spherical graphite. This graphite, which is available in various forms, has a very strong effect on the strength, toughness and thermal conductivity of cast iron. To improve these properties, it is known to additionally use inoculation alloys which act as nucleating agents.
  • the freely excreted intermetallic compound Fe 3 C also referred to as carbide or cementite, is preferably formed, which has an increased disadvantageous effect on the properties of the cast iron.
  • the actual vaccine-active substances such.
  • B. Ca, Al, Mg, Zr or Ba are contained in most known seed alloys in ferrosilicon.
  • the calcium content is 1 to 3% and the aluminum content 1 to 2%, since calcium and aluminum have a positive effect on the effect of the other elements.
  • ferro-silicon-based inoculant alloys which contain strontium in an amount of 1 to 4% as the vaccine substance.
  • US Pat. No. 3,272,623 discloses ferro-silicon-based inoculation alloys which, in addition to barium, zirconium, aluminum and 0.5 to 4% calcium, also contain 2 to 7% manganese.
  • the invention has for its object to provide an inoculation alloy based on ferrosilicon or silicon for the production of cast iron with lamellar, compact or spheroidal graphite, which does not have the mentioned disadvantages of the known inoculation alloys or has them to a lesser extent.
  • the inoculation alloy according to the invention effectively suppresses carbide excretion, although the aluminum and calcium content is very low. This was unpredictable because it was previously assumed that aluminum and calcium had a positive effect on the elements barium and zirconium.
  • the content of barium and / or zirconium is preferably 0.4 to 1.5%. With a content of less than 0.1% of these elements, the effect of the alloy deteriorates very strongly, while above 10% no further improvement is detectable. It is essential for the invention that the contents of aluminum and calcium are as low as possible.
  • the aluminum content is preferably below 1.0%, while the calcium content is preferably below 0.1%.
  • the alloying constituents barium and / or zirconium do not necessarily have to be present in the alloy in metallic form, but they can also be partially present in non-metallic, for example oxidic, form without negative results being ascertained with regard to the nucleating effect.
  • non-metallic barium and / or zirconium compounds introduced into the ferrosilicon or silicon melt are caused by the presence of metallic reducing agents such as e.g. B. calcium and aluminum is reduced, but the majority of these compounds will still be in non-metallic form in the alloy.
  • all compounds of these elements are suitable as barium or zirconium compounds.
  • Oxygen-containing compounds of barium and zirconium have proven to be particularly advantageous, the carbonate, oxide, hydroxide or sulfate being used in particular.
  • the amount of the compounds used depends solely on the desired barium and / or zirconium content in the alloy.
  • a reducing agent is preferably used in addition to the barium or zirconium compound.
  • Suitable reducing agents are the customary carbon-containing compounds such as calcium carbide or graphite as well as the metallic or metal-containing alkaline earth metal compounds such as calcium, magnesium, calcium silicon or ferrosilicon magnesium.
  • the weight ratio of barium and / or zirconium compound to reducing agent depends on the desired metal content of barium or zirconium in the inoculation alloy to be produced. As a rule, the reducing agent is used in a stoichiometric or sub-stoichiometric amount.
  • the content of metallic barium and / or zirconium in the alloy can be set relatively high even without a reducing agent by using a master alloy consisting preferably of 5 to 40% metallic barium and / or zirconium, which the ferrosilicon or Silicon melt is added.
  • the preparation of the inoculant can be done in a conventional device such as. B. an induction furnace or downhole furnace.
  • the advantages of the inoculation alloy according to the invention which is added to the cast iron in amounts of 0.05 to 1% by weight, based on the cast iron, are good nucleating properties and thus good suppression of carbide excretion and its technically simple and inexpensive production.
  • the invention therefore also relates to the use of the inoculation alloy according to the invention for the production of cast iron.
  • 1 t of cast iron with lamellar graphite is filled into the transport pan from the induction furnace. 250 kg are then poured into the ladle.
  • FeSiSr or the FeSiBa alloy according to the invention can then be added to the pouring stream during the filling process. The amount added was 0.3 percent by weight and the iron temperature was 1400 ° C.
  • the raw material was broken down to 0.8 - 10 mm and analyzed:

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Ceramic Products (AREA)
  • Feed For Specific Animals (AREA)
EP85110607A 1984-09-13 1985-08-23 Impflegierung auf Basis von Ferrosilicium oder Silicium und Verfahren zu ihrer Herstellung Expired EP0175934B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3433610 1984-09-13
DE19843433610 DE3433610A1 (de) 1984-09-13 1984-09-13 Impflegierung auf basis von ferrosilicium oder silicium und verfahren zu ihrer herstellung

Publications (2)

Publication Number Publication Date
EP0175934A1 EP0175934A1 (de) 1986-04-02
EP0175934B1 true EP0175934B1 (de) 1988-06-29

Family

ID=6245297

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85110607A Expired EP0175934B1 (de) 1984-09-13 1985-08-23 Impflegierung auf Basis von Ferrosilicium oder Silicium und Verfahren zu ihrer Herstellung

Country Status (6)

Country Link
US (1) US4643768A (ja)
EP (1) EP0175934B1 (ja)
JP (1) JPS6173858A (ja)
CA (1) CA1238787A (ja)
DE (2) DE3433610A1 (ja)
NO (1) NO853547L (ja)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01136920A (ja) * 1987-11-20 1989-05-30 Hitachi Metals Ltd 球状黒鉛鋳鉄の製造法
US5002733A (en) * 1989-07-26 1991-03-26 American Alloys, Inc. Silicon alloys containing calcium and method of making same
US5008074A (en) * 1990-04-26 1991-04-16 American Alloys, Inc. Inoculant for gray cast iron
DE4124159C2 (de) * 1991-07-20 1996-08-14 Sueddeutsche Kalkstickstoff Vorlegierung zur Behandlung von Gußeisenschmelzen
GB0614705D0 (en) * 2006-07-25 2006-09-06 Foseco Int Improved meethod of producing ductile iron
CN107012384B (zh) * 2016-01-27 2018-05-29 鞍钢股份有限公司 一种硅钢用高纯度低碳硅铁及其冶炼方法
CN113278756A (zh) * 2021-04-19 2021-08-20 成都宏源铸造材料有限公司 一种铸铁用硅系孕育剂的制备方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2490818A (en) * 1947-08-28 1949-12-13 Kuniansky Max Cast-iron pipe
US2676097A (en) * 1951-03-08 1954-04-20 Vanadium Corp Of America Composition for addition to cast iron or steel
US2750284A (en) * 1951-12-22 1956-06-12 Allis Chalmers Mfg Co Process for producing nodular graphite iron
US3151975A (en) * 1960-05-04 1964-10-06 Julius D Madaras Process for treating molten ferrous metal
US3137570A (en) * 1962-08-10 1964-06-16 Vanadium Corp Of America Inoculating alloy
GB1002107A (en) * 1962-08-31 1965-08-25 British Cast Iron Res Ass Improvements in the manufacture of cast irons
US3272623A (en) * 1963-10-28 1966-09-13 Union Carbide Corp Inoculating alloys consisting of si-al-ca-ba-mn-zr-fe
SU544706A1 (ru) * 1975-05-11 1977-01-30 Институт Проблем Литья Ан Украинской Сср Лигатура

Also Published As

Publication number Publication date
JPS6173858A (ja) 1986-04-16
DE3433610A1 (de) 1986-03-20
US4643768A (en) 1987-02-17
EP0175934A1 (de) 1986-04-02
CA1238787A (en) 1988-07-05
NO853547L (no) 1986-03-14
DE3563544D1 (en) 1988-08-04

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