US20100178193A1 - Cast iron alloy with good oxidation resistance at high temperatures - Google Patents

Cast iron alloy with good oxidation resistance at high temperatures Download PDF

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Publication number
US20100178193A1
US20100178193A1 US12/303,857 US30385707A US2010178193A1 US 20100178193 A1 US20100178193 A1 US 20100178193A1 US 30385707 A US30385707 A US 30385707A US 2010178193 A1 US2010178193 A1 US 2010178193A1
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Prior art keywords
alloy
cast iron
iron alloy
temperature
weight
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US12/303,857
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English (en)
Inventor
Leonhard Zeipper
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Georg Fischer Eisenguss GmbH
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Georg Fischer Eisenguss GmbH
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Assigned to GEORG FISCHER EISENGUSS GMBH reassignment GEORG FISCHER EISENGUSS GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ZEIPPER, LEONHARD
Publication of US20100178193A1 publication Critical patent/US20100178193A1/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/10—Cast-iron alloys containing aluminium or silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/06—Cast-iron alloys containing chromium
    • C22C37/08—Cast-iron alloys containing chromium with nickel

Definitions

  • the invention relates to a cast iron alloy for cast iron products with a high oxidation resistance at high surface temperatures.
  • EP 076 701 B1 discloses a heat-resistant ferritic cast iron with spheroidal graphite.
  • the alloy contains up to 3.4 wt % C, from 3.5 to 5.5 wt % Si, up to 0.6 wt % Mn, from 0.1 to 0.7 wt % Cr, from 0.3 to 0.9 wt % Mo and up to 0.1 wt % of a component forming spheroidal graphite.
  • the alloy is used for the production of turbocharger housings in motor vehicle manufacture.
  • EP 1 386 976 B1 discloses an alloy for cast iron products with high thermal stability.
  • the alloy consists of from 2.5 to 2.8 wt % C, from 4.7 to 5.2 wt % Si, from 0.5 to 0.9 wt % Mo, from 0.5 to 0.9 wt % Al, up to 0.04 wt % Mg, up to 0.02 wt % S, from 0.1 to 1.0 wt % Ni, from 0.1 to 0.4 wt % Zr, remainder Fe and usual impurities.
  • the alloy is used for exhaust manifolds and turbocharger housings in motor vehicle manufacture.
  • the foregoing object is achieved by providing a cast iron alloy for cast iron products with a high oxidation resistance at surface temperatures of from 800 to 950° C. having the chemical constituents from 2.8 to 3.6 wt % C, from 2.0 to 3.0 wt % Si, from 2.5 to 4.3 wt % Al, up to 1.0 wt % Ni, up to 0.8 wt % Mo, up to 0.3 wt % Mn, from 0.002 to 0.1 wt % Ce, from 0.023 to 0.06 wt % Mg, up to 0.01 wt % S, remainder Fe and usual impurities.
  • FIG. 1 represents the transition of the present alloy from the ferritic phase to the austenitic phase as a function of temperature.
  • FIG. 2 represents the thermal expansion coefficient of the new alloy with the designation SiMo1000plus, measured as a function of temperature, compared with other cast iron alloys.
  • FIG. 3 represents the thermal conductivity of the alloy SiMo1000plus compared with other cast iron alloys as a function of temperature.
  • the cast parts it is advantageous for the cast parts to expand elastically as regularly as possible at the operating temperature. This is achieved by the temperature of the transition from the ferritic phase to the austenitic phase of the alloy lying above 880° C. It is also achieved by the thermal expansion of the alloy specimens as measured by a dilatometer varying uniformly and constantly up to a temperature of 880° C. It is also achieved by the alloy having a thermal expansion coefficient of from 8 to 12 10 ⁇ 6 /K at 25° C. and from 13.5 to 15.5 10 ⁇ 6 /K at 900° C. These are values which, plotted against the temperature, are consistently about 30% lower than the values of so-called Ni resist alloys with the standard designations D5S or GJSA XNiSiCr35-5-2.
  • the cast parts are furthermore advantageous for the cast parts not to be brittle at room temperature.
  • the alloy having strength values of from 500 to 650 MPa for the tensile strength R m , from 470 to 620 MPa for the yield point R p0.2 and from 2.0 to 4.0 for the elongation at break A 5 . These are strengths values which are about 1.3 to 1.5 times as great as those of so-called Ni resist alloys.
  • the ductility of the cast iron alloys proposed here corresponds to the average value of standard commercial ferritic materials which, however, cannot be exposed to temperatures of more than 860° C.
  • the cast parts are also advantageous for the cast parts to be readily processable. This is achieved by the alloy having a Brinell hardness of from 220 to 250.
  • the alloy is also advantageous for the alloy to be composed of elements which are as economical as possible. This is achieved by the alloy containing less than 0.8 wt % Mo, less than 1 wt % Cr and less than 1 wt % Ni.
  • Ni resist alloys typically contain about 30 to 35 wt % Ni and about 2 to 5 wt % Cr.
  • Spherocast alloys alloyed with molybdenum normally contain about 0.8 wt % molybdenum.
  • the cast parts are also advantageous for the cast parts to be as insensitive as possible to heat. This is achieved by the alloy specimens having a thermal conductivity of 25 W/mK at 25° C. and a thermal conductivity of 26 W/mK at 900° C. Ni resist alloys have a thermal conductivity which is 20 to 50% lower at 400° C.
  • the key concept of the invention is to provide a cast iron alloy which allows as high as possible a working temperature with a high scaling resistance in turbocharger housings and exhaust manifolds, and which can be produced as economically as possible and as simply as possible in a casting process.
  • Previous standard solutions for higher working temperatures reside in the use of expensive cast steel and austenitic cast iron or in the use of elaborately produced sheet metal designs.
  • the exhaust manifold is cast directly into the molds from a melt, which was pretreated with magnesium in a GF converter. Subsequent time-consuming heat treatment, such as solution annealing or austempering, is not necessary.
  • the treatment with magnesium has a favorable effect on the sulfur content of the alloy and ensures the formation of graphite in the spheroidal or vermicular form.
  • An Mg content of about 0.025 wt % is ideal for the present Al content of about 2.5 wt %.
  • the alloy specimens have a density which is at least 5% less than the density of comparable conventional cast iron alloys.
  • the carbon content of from 2.8 to 3.6 wt % ensures a composition which lies close to the eutectic. Less than 2.8% C is unfavorable for the feedstock of the cast parts. More than 3.6% C is unfavorable for the high-temperature properties of the alloy.
  • Cerium is added in amounts of from 0.002 to 0.1 wt % as a nucleation promoter. More than 0.1% Ce is unfavorable and leads to the formation of so-called chunky graphite.
  • the silicon content of from 2 to 3 wt % in the present alloy has a positive effect on formation of the ferritic phase, improves the fluidity of the melt, raises the yield point and improves the heat resistance of the cast parts. Less than 2% Si is unfavorable for the chill depth. More than 3% Si increases the brittleness of the cast parts.
  • the aluminum content of from 2.5 to 4.3 wt % likewise has a positive effect on formation of the ferritic phase and neutralizes the nitrogen. Less than 2.5% Al is unfavorable for the graphite stabilization. More than 4.3% Al is unfavorable for the formation of spheroidal graphite.
  • the nickel content of from 0.1 to 1 wt % raises the yield point without substantially increasing the brittleness and improves the corrosion resistance. Less than 0.1% Ni is unfavorable for the graphite stabilization. More than 1% Ni is unfavorable for the formation of bainite and martensite in thinner regions of the cast parts. Nickel is a comparatively expensive alloy element.
  • the molybdenum content of from 0.4 to 0.8 wt % has a positive effect on increasing the yield point, the thermal stability, the creep strength and therefore the thermal cycling stability. Less than 0.4% Mo is unfavorable for the graphite stabilization. More than 0.8% Mo is unfavorable for the formation of carbides and gas bubbles. Molybdenum is a very expensive alloy element.
  • the manganese content of up to 0.3 wt % has a positive effect on the binding of sulfur. More than 0.3% Mn is unfavorable for the formation of grain boundary carbides and impairs of the nucleation state. Too much Mn promotes the formation of perlite in the crystal lattice. The bainitic lattice becomes increasingly brittle.
  • the chromium content of up to 1 wt % has a positive effect on the creep strength and the thermal stability of the castings.
  • the melting temperatures for spherocast are about 100 to 200° C. lower. This means that less energy is consumed and less alloy elements are released to the environment by evaporation.
  • FIG. 1 represents the transition of the present alloy from the ferritic phase to the austenitic phase as a function of temperature. It may be seen here that an equilibrium phase transition takes place at about 900° C. The way in which the alloy changes aggregate state at a melting temperature of from 1240 to 1280° C. may also be seen here.
  • FIG. 2 represents the thermal expansion coefficient of the new alloy with the designation SiMo1000plus, measured as a function of temperature, compared with other cast iron alloys.
  • FIG. 3 represents the thermal conductivity of the alloy SiMo1000plus compared with other cast iron alloys as a function of temperature.
  • D5S stands for the so-called Ni resist alloys
  • GJV SiMo and SiMoNi stand for the previously known spherocast alloys alloyed with about 1% Mo.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Supercharger (AREA)
  • Exhaust Silencers (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
US12/303,857 2006-06-08 2007-05-10 Cast iron alloy with good oxidation resistance at high temperatures Abandoned US20100178193A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP06011786A EP1865082A1 (de) 2006-06-08 2006-06-08 Gusseisenlegierung mit guter Oxydationbeständigkeit bei hoher Temperaturen
EP06011786.8 2006-06-08
PCT/EP2007/054506 WO2007141108A1 (de) 2006-06-08 2007-05-10 Gusseisenlegierung mit guter oxydationbeständigkeit bei hoher temperaturen

Publications (1)

Publication Number Publication Date
US20100178193A1 true US20100178193A1 (en) 2010-07-15

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ID=37265690

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US12/303,857 Abandoned US20100178193A1 (en) 2006-06-08 2007-05-10 Cast iron alloy with good oxidation resistance at high temperatures

Country Status (9)

Country Link
US (1) US20100178193A1 (ko)
EP (1) EP1865082A1 (ko)
JP (1) JP2009540115A (ko)
KR (1) KR20090037883A (ko)
CN (1) CN101460641A (ko)
BR (1) BRPI0712390A2 (ko)
CA (1) CA2653239A1 (ko)
RU (1) RU2008152348A (ko)
WO (1) WO2007141108A1 (ko)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170016098A1 (en) * 2014-02-21 2017-01-19 Doosan Infracore Co., Ltd. Spheroidal graphite cast iron for an engine exhaust system
RU2623513C1 (ru) * 2016-10-31 2017-06-27 Юлия Алексеевна Щепочкина Чугун
US20230085990A1 (en) * 2021-09-21 2023-03-23 Ford Global Technologies, Llc Cast iron alloy for automotive engine applications with superior high temperature oxidation properties

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101899609B (zh) * 2010-08-31 2012-11-14 卫辉熔金高温材料有限责任公司 利用耐热球墨铸铁加工钢包滑动水口机构滑托的方法
CN102851575B (zh) * 2012-09-24 2014-04-23 苏州东海玻璃模具有限公司 抗氧化性合金化灰口铸铁及其制备方法
JP2014148694A (ja) * 2013-01-31 2014-08-21 Daihatsu Motor Co Ltd 鋳鉄
WO2014185455A1 (ja) * 2013-05-14 2014-11-20 東芝機械株式会社 高強度高減衰能鋳鉄
CN103898397B (zh) * 2014-04-14 2016-03-30 天津新伟祥工业有限公司 汽车涡轮壳及排气管用高硅钼铝铁素体耐热球墨铸铁
WO2016084021A1 (en) * 2014-11-26 2016-06-02 Honeywell International Inc. Cast silicon molybdenum aluminium ferritic ductile iron
CN106435343A (zh) * 2016-10-18 2017-02-22 河池学院 用于伺服机械手的滑轨的合金
CN107164706A (zh) * 2017-05-11 2017-09-15 安徽大德中电科技发展股份有限公司 一种适用于高速电机的合金钢转轴
CN107287497B (zh) * 2017-08-02 2019-01-29 马鞍山市万鑫铸造有限公司 高珠光体高韧性球墨铸铁
CN117604371B (zh) * 2023-12-12 2024-07-12 河北京东管业有限公司 一种球墨铸铁及其制备方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2885285A (en) * 1957-08-22 1959-05-05 Allis Chalmers Mfg Co Alloyed nodular iron
JPS517657A (ja) * 1974-07-10 1976-01-22 Kito Kk Cheenburotsuku
JPS5672151A (en) * 1979-11-17 1981-06-16 Toyo Chuko Kk Pseudo flaky graphite cast iron for glass molding metal mold
US6508981B1 (en) * 2001-05-24 2003-01-21 Wescast Industries, Inc. High temperature oxidation resistant ductile iron
US20040091383A1 (en) * 2001-05-16 2004-05-13 Suzuki Motor Corporation Ferrite-based spheroidal graphite cast iron and exhaust system component using the same
US7156929B2 (en) * 2002-07-24 2007-01-02 Georg Fischer Fahrzeugtechnik Ag Cast iron alloy

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52135820A (en) * 1976-05-08 1977-11-14 Tsnii Tefunorojii Mashinosutor Heat resistance iron
JPS6053736B2 (ja) 1981-10-05 1985-11-27 日産自動車株式会社 耐熱用球状黒鉛鋳鉄
JPH03215649A (ja) * 1990-01-18 1991-09-20 Kobe Chutetsusho:Kk 高アルミニウム鋳鉄棒
DE19654893C2 (de) * 1996-07-25 1999-06-10 Federal Mogul Burscheid Gmbh Kolbenringe von Verbrennungskraftmaschinen aus einer Gußeisenlegierung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2885285A (en) * 1957-08-22 1959-05-05 Allis Chalmers Mfg Co Alloyed nodular iron
JPS517657A (ja) * 1974-07-10 1976-01-22 Kito Kk Cheenburotsuku
JPS5672151A (en) * 1979-11-17 1981-06-16 Toyo Chuko Kk Pseudo flaky graphite cast iron for glass molding metal mold
US20040091383A1 (en) * 2001-05-16 2004-05-13 Suzuki Motor Corporation Ferrite-based spheroidal graphite cast iron and exhaust system component using the same
US6508981B1 (en) * 2001-05-24 2003-01-21 Wescast Industries, Inc. High temperature oxidation resistant ductile iron
US7156929B2 (en) * 2002-07-24 2007-01-02 Georg Fischer Fahrzeugtechnik Ag Cast iron alloy

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170016098A1 (en) * 2014-02-21 2017-01-19 Doosan Infracore Co., Ltd. Spheroidal graphite cast iron for an engine exhaust system
US10030289B2 (en) * 2014-02-21 2018-07-24 Doosan Infracore Co., Ltd. Spheroidal graphite cast iron for an engine exhaust system
RU2623513C1 (ru) * 2016-10-31 2017-06-27 Юлия Алексеевна Щепочкина Чугун
US20230085990A1 (en) * 2021-09-21 2023-03-23 Ford Global Technologies, Llc Cast iron alloy for automotive engine applications with superior high temperature oxidation properties
US11667995B2 (en) * 2021-09-21 2023-06-06 Ford Global Technologies, Llc Cast iron alloy for automotive engine applications with superior high temperature oxidation properties

Also Published As

Publication number Publication date
RU2008152348A (ru) 2010-07-20
WO2007141108A1 (de) 2007-12-13
EP1865082A1 (de) 2007-12-12
CN101460641A (zh) 2009-06-17
JP2009540115A (ja) 2009-11-19
CA2653239A1 (en) 2007-12-13
BRPI0712390A2 (pt) 2012-10-16
KR20090037883A (ko) 2009-04-16

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Owner name: GEORG FISCHER EISENGUSS GMBH, AUSTRIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ZEIPPER, LEONHARD;REEL/FRAME:024123/0690

Effective date: 20100218

STCB Information on status: application discontinuation

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