EP2481827B1 - Gussstahllegierung und Gussbauteil - Google Patents

Gussstahllegierung und Gussbauteil Download PDF

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Publication number
EP2481827B1
EP2481827B1 EP20120151206 EP12151206A EP2481827B1 EP 2481827 B1 EP2481827 B1 EP 2481827B1 EP 20120151206 EP20120151206 EP 20120151206 EP 12151206 A EP12151206 A EP 12151206A EP 2481827 B1 EP2481827 B1 EP 2481827B1
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EP
European Patent Office
Prior art keywords
weight
component
percent
cast
maximally
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP20120151206
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2481827A1 (de
Inventor
Sylvia Hartmann
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.)
Eberspaecher Exhaust Technology GmbH and Co KG
Original Assignee
Eberspaecher Exhaust Technology GmbH and Co KG
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Application filed by Eberspaecher Exhaust Technology GmbH and Co KG filed Critical Eberspaecher Exhaust Technology GmbH and Co KG
Publication of EP2481827A1 publication Critical patent/EP2481827A1/de
Application granted granted Critical
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium

Definitions

  • the present invention relates to a cast component of a ferritic cast steel alloy, ie of a cast steel alloy with ferritic microstructure.
  • the present invention also relates to a component of an exhaust system for an internal combustion engine, in particular of a motor vehicle, which has at least one cast component produced from such a cast steel alloy.
  • the individual components of the exhaust system are exposed to a comparatively high thermal load, so that usually only metallic materials, in particular steel alloys, are used to produce such components of an exhaust system.
  • These components are mainly gas-carrying pipes and housings for exhaust gas treatment equipment, such. Ex. Silencer, particle filter, catalysts.
  • Components of these components, such as Flanges, can be castings, preferably steel castings.
  • the hot combustion exhaust gases create an aggressive environment which, especially in combination with water or steam, leads to a comparatively high risk of corrosion for the components or cast components.
  • a particularly high risk of corrosion exists in an SCR plant, in which a comparatively aggressive reducing agent is used.
  • an aqueous urea solution is supplied to the exhaust gas stream, the urea reacting by hydrolysis to ammonia used in an SCR catalyst to reduce nitrogen oxides.
  • ammonia-containing atmosphere is relatively aggressive and increases for the components and cast components involved Risk of corrosion.
  • Corrosion-resistant steel alloys, ie stainless steel alloys are for example austenitic.
  • austenitic cast steel alloys in exhaust systems for producing cast parts, ie cast steel alloys with which castings with an austenitic structure can be produced.
  • Austenitic cast iron is comparatively expensive, due in particular to the nickel content of austenitic cast steel alloys.
  • ferritic cast steel alloys are all not resistant to intergranular corrosion. Such intercrystalline corrosion occurs, for example, at temperatures between 300 ° C and 700 ° C in conjunction with a corresponding aggressive environment.
  • the intercrystalline corrosion is attributed to sensitizing the known ferritic cast steel alloys in the stated temperature range (300 ° C. to 700 ° C.), so that chromium carbides are formed which precipitate on the grain boundaries and withdraw the chromium from the environment close to the grain boundary.
  • chromium is critical to alloy corrosion resistance in conventional ferritic cast steel alloys.
  • This sensitization takes place either in the operation of the exhaust system at the usual operating temperatures prevailing there, which are in the mentioned temperature window, or already during the welding of the individual cast components or components, if these are e.g. when cooling down after the welding process said temperature window.
  • Another consequence of the sensitization is the so-called grain disintegration, whereby the cohesion of the material in the structure is disturbed.
  • Ferritic cast steel alloys are significantly cheaper than austenitic cast steel alloys, so that there is a high interest in the production of exhaust systems for internal combustion engines, the cast components or components used - where possible - to produce from ferritic cast steel alloys in the context of mass production. However, this is not possible with the currently available ferritic cast steel alloys for the reasons mentioned in many cases.
  • ferritic cast steels are for example from the JP 5 033105 A as well as from the JP 2008 195985 A known.
  • the present invention is concerned with the problem of providing for a cast component of a cast steel alloy, an embodiment in which the risk of intergranular corrosion is reduced even at higher temperature load, for example, during joining, in particular during welding, and / or during operation of an exhaust system to the castings produced therefrom occurs.
  • the invention is based on the general idea, a cast steel alloy that produces a ferritic microstructure and iron (Fe), carbon (C), chromium (Cr) and molybdenum (Mo), titanium (Ti) and niobium (Nb) add or to alloy.
  • the alloying of titanium and niobium stabilizes the cast steel alloy.
  • the inventively proposed targeted stabilization of the cast steel alloy with titanium and niobium causes the structure undergoes a grain refining, so that therefore smaller grain sizes occur and that the cast steel alloy a comparatively high and durable resistance to intergranular corrosion in the relevant critical temperature range of about 300 ° C has up to about 600 ° C or about 700 ° C.
  • the cast steel alloy is a ferritic cast steel alloy, which therefore leads to cast components with ferritic structure.
  • the cast steel alloy is designed nickel-free. This means that the cast steel alloy contains no nickel apart from parasitic effects that may result from unavoidable impurities. As a result, the cast steel alloy presented here is particularly inexpensive compared to nickel-containing austenitic materials.
  • the proportion of chromium (Cr) in the alloy is in a range of from 17% by weight to 25% by weight inclusive.
  • the proportion of molybdenum (Mo) in the alloy is in a range of incl. 1 percent by weight up to and including 3 percent by weight.
  • the proportion of titanium (Ti) in the alloy is at most 1 percent by weight.
  • the proportion of niobium (Nb) in the alloy is at most 1 percent by weight.
  • the alloy contains a content of carbon (C) of at most 0.05% by weight and a content of chromium (Cr) of incl. 17% by weight up to and including 25% by weight and a content of molybdenum (Mo) incl. 1% by weight up to and including 3 weight percent and a titanium (Ti) content of max. 1 weight percent and a niobium (Nb) content of max. 1 weight percent.
  • C carbon
  • Cr chromium
  • Mo molybdenum
  • the alloy in the invention contains at most 1.00 weight percent silicon and at most 1.00 weight percent manganese and at most 0.040 weight percent phosphorus and at most 0.015 weight percent sulfur and at most 0.040 weight percent nitrogen.
  • the present invention relates to a cast component produced from such a cast steel alloy, in particular an exhaust-carrying cast component, an exhaust system for an internal combustion engine, in particular a motor vehicle.
  • the cast component can form a component, for example a connection flange, of a component, for example of a housing, of such an exhaust system.
  • said cast component is made entirely or at least partially from the cast steel alloy presented here. At least directly to the exhaust exposed area of the respective cast component is suitably made from the cast steel alloy presented here.
  • Cast components or components may be, for example, exhaust pipes or housings of exhaust treatment devices. Likewise, it may be the cast component to a flow guide element, such. Ex. A funnel, a pipe, a flange or the like act.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Exhaust Silencers (AREA)
EP20120151206 2011-01-31 2012-01-16 Gussstahllegierung und Gussbauteil Active EP2481827B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201110003388 DE102011003388A1 (de) 2011-01-31 2011-01-31 Gussstahllegierung und Gussbauteil

Publications (2)

Publication Number Publication Date
EP2481827A1 EP2481827A1 (de) 2012-08-01
EP2481827B1 true EP2481827B1 (de) 2014-04-30

Family

ID=45562715

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20120151206 Active EP2481827B1 (de) 2011-01-31 2012-01-16 Gussstahllegierung und Gussbauteil

Country Status (5)

Country Link
US (1) US9090958B2 (zh)
EP (1) EP2481827B1 (zh)
JP (1) JP5785880B2 (zh)
CN (1) CN102618789B (zh)
DE (1) DE102011003388A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111549280B (zh) * 2020-05-18 2021-12-21 樟树市兴隆高新材料有限公司 一种塑料模具钢及其制备方法

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0617516B2 (ja) * 1984-04-25 1994-03-09 住友金属工業株式会社 フエライト系ステンレス鋼熱延鋼帯の製造法
JPH0559498A (ja) 1990-12-28 1993-03-09 Toyota Motor Corp フエライト系耐熱鋳鋼およびその製造方法
JPH04325658A (ja) * 1991-04-24 1992-11-16 Daido Steel Co Ltd 耐熱鋳鋼
JPH05112848A (ja) * 1991-04-26 1993-05-07 Nippon Steel Corp 耐全面腐食性と耐局部腐食性の優れた自動車排気系ステンレス鋼
JPH0533105A (ja) * 1991-07-31 1993-02-09 Daido Steel Co Ltd フエライト系耐熱鋳鋼
JP3427502B2 (ja) * 1994-08-22 2003-07-22 住友金属工業株式会社 自動車排気系部材用フェライトステンレス鋼
JPH09279312A (ja) * 1996-04-18 1997-10-28 Nippon Steel Corp 高温特性、耐食性及び加工性に優れたフェライト系ステンレス鋼
JP3242007B2 (ja) * 1996-09-13 2001-12-25 日本冶金工業株式会社 耐酸化スケール剥離性に優れた自動車排気系部材用フェライト系ステンレス鋼
JPH10251808A (ja) * 1997-03-11 1998-09-22 Sanyo Special Steel Co Ltd 冷・温間鍛造性、耐き裂性に優れた予燃焼室式ディーゼルエンジンインサート用フェライト系ステンレス鋼
US6641780B2 (en) * 2001-11-30 2003-11-04 Ati Properties Inc. Ferritic stainless steel having high temperature creep resistance
JP4304109B2 (ja) * 2004-04-02 2009-07-29 新日鐵住金ステンレス株式会社 熱疲労特性に優れた自動車排気系部材用フェライト系ステンレス鋼
JP2008156692A (ja) * 2006-12-22 2008-07-10 Nisshin Steel Co Ltd 燃料電池高温器用フェライト系ステンレス鋼
JP4915923B2 (ja) * 2007-02-09 2012-04-11 日立金属株式会社 耐酸性に優れたフェライト系ステンレス鋳鋼および鋳造部材

Also Published As

Publication number Publication date
EP2481827A1 (de) 2012-08-01
JP2012158834A (ja) 2012-08-23
DE102011003388A1 (de) 2012-08-02
US20120195785A1 (en) 2012-08-02
CN102618789B (zh) 2015-05-13
CN102618789A (zh) 2012-08-01
JP5785880B2 (ja) 2015-09-30
US9090958B2 (en) 2015-07-28

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