EP2710164B1 - Fonte à graphite sphéroïdal fortement alliée ayant une structure austénitique, utilisation de ladite fonte pour fabriquer des composants structuraux et composant structural constitué de ladite fonte - Google Patents
Fonte à graphite sphéroïdal fortement alliée ayant une structure austénitique, utilisation de ladite fonte pour fabriquer des composants structuraux et composant structural constitué de ladite fonte Download PDFInfo
- Publication number
- EP2710164B1 EP2710164B1 EP12726221.0A EP12726221A EP2710164B1 EP 2710164 B1 EP2710164 B1 EP 2710164B1 EP 12726221 A EP12726221 A EP 12726221A EP 2710164 B1 EP2710164 B1 EP 2710164B1
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- EP
- European Patent Office
- Prior art keywords
- cast iron
- ranging
- equal
- present
- iron according
- 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.)
- Not-in-force
Links
- 229910001018 Cast iron Inorganic materials 0.000 title claims description 62
- 229910045601 alloy Inorganic materials 0.000 title claims description 10
- 239000000956 alloy Substances 0.000 title claims description 10
- 229910001141 Ductile iron Inorganic materials 0.000 title claims description 7
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 23
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 14
- 229910052710 silicon Inorganic materials 0.000 claims description 14
- 239000010703 silicon Substances 0.000 claims description 14
- 239000011572 manganese Substances 0.000 claims description 13
- 229910052721 tungsten Inorganic materials 0.000 claims description 12
- 239000010937 tungsten Substances 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 11
- 239000010955 niobium Substances 0.000 claims description 11
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 11
- 229910052759 nickel Inorganic materials 0.000 claims description 9
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 239000004615 ingredient Substances 0.000 claims description 8
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 7
- 229910052748 manganese Inorganic materials 0.000 claims description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims description 7
- 239000011733 molybdenum Substances 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 229910052758 niobium Inorganic materials 0.000 claims description 6
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 239000011574 phosphorus Substances 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 description 9
- 230000005496 eutectics Effects 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 5
- 150000001247 metal acetylides Chemical class 0.000 description 5
- 239000010451 perlite Substances 0.000 description 5
- 235000019362 perlite Nutrition 0.000 description 5
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000009472 formulation Methods 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 101150087698 alpha gene Proteins 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 229910001339 C alloy Inorganic materials 0.000 description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 2
- -1 Tungsten carbides Chemical class 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 229910001567 cementite Inorganic materials 0.000 description 2
- 101150034785 gamma gene Proteins 0.000 description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 2
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910016807 Mn3C Inorganic materials 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- 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
Definitions
- the present invention relates to the industry of construction ferroalloys, particularly to iron-carbon alloys such as cast irons and steels, and more in detail to a high-alloy spheroidal graphite cast iron having an austenitic structure with a chemical composition according to the preamble of claim 1.
- the recent technological developments have led the operating temperature reached by such pieces to increase till reaching values ranging about from 800°C to 1020°C.
- the known alloys such as CF8 C-Plus known from 'Creep behaviour of a new cast austenitic alloy', John P. Shingledecker et al., Oak Ridge National Laboratory, TN, USA, 2006 used for making these products, in the above operating temperature range, are usually two: high Nickel content cast iron or austenitic stainless Steels.
- Ni-Resist cast iron The high Nickel content cast iron is available on the market under the name Ni-Resist cast iron and it has an austenitic structure; several compositions of this type of cast iron are known, one that is particularly useful for the application field to which reference is made is that described in the document titled as "Ni-resist type D5S -an improved material for turbocharger housings" published in 1980.
- the IS Steel generally has a yield strength (the temperature being equal) higher than NR cast iron; however it has also a considerably higher cost, about twice that of NR cast iron.
- IS Steel at such temperature value has a quite high yield strength, equal to about 110 Mpa.
- the present invention aims at overcoming the drawbacks of the prior art.
- the present invention aims at providing a material accomplishing the requirements set forth above.
- a first object of the present invention is a high-alloy spheroidal graphite cast iron having an austenitic structure comprising the following ingredients in the following percentages (by weight, on the total amount):
- a further object of the present invention is a component, particularly a structural component, made of said cast iron, in particular made by a casting process followed by one or more chip removal machining processes.
- Still another object of the present invention is a turbo manifold for internal combustion engines (Otto or diesel engines) made of said cast iron.
- the high-alloy spheroidal graphite cast iron having an austenitic structure according to the present invention comprises the following ingredients in the following percentages by weight:
- the high-alloy spheroidal graphite cast iron having an anstenitic structure comprising, among other things, the above ingredients with the mentioned percentages has optimal mechanical properties, which are between those of NR cast iron described above and those of austenitic IS Stainless Steels mentioned above.
- the cast iron according to the present invention has a cost intermediate between that of known NR cast iron and that of austenitic stainless steel, therefore having an interesting cost saving in comparison with austenitic Stainless Steel.
- the cast iron according to the present invention essentially has all the best properties for overcoming the drawbacks mentioned above and for serving the function as a material for making turbo manifolds for internal combustion engines.
- the cast iron according to the present invention has, in a temperature range from about 780°C to 840°C, a yield strength still higher than that of IS Steel, making it even preferable than the latter for specific applications in such temperature range.
- Silicon is a graphitizing element and it moves the eutectic transformation to the left increasing the eutectic temperature; these two combined actions (the graphitizing action and movement of the eutectic curve) reduces the solidification range for a given carbon value.
- Silicon is an Alphagene element and in the value range of the invention (from 6,1 to 6,7%) it moves the solidification of the alloy in the stable system (graphite and ferrite).
- Tungsten does not affect the formation of the austenitic matrix, since it combines with the graphite segregated by the Silicon and resulting in the formation of further very stable Tungsten carbides.
- Nickel it has to be noted that it has a Gammagene effect and it reduces the critical points and the critical cooling speed, as well as it refines the perlite grain. Nickel, in the shown percentages, guarantees the stability of the cast iron matrix from ambient temperature to 1020°C and it does not generate carbides.
- Chrome it is an Alphagene element and it is a high carbide forming element and it forms very thermally stable carbides.
- the percentages of Chrome shown in the formulation of the cast iron according to the present invention guarantees the graphitization of the eutectic cementite and of perlite to slow down during a normal slow cooling.
- a general improvement of mechanical properties can be obtained by adding from 1,6% to 2% about of Chrome according to the present invention, due to the strong stabilizing effect of perlite, exerted by Chrome, and to the removal of free perlite formed after the slow cooling.
- the cast iron according to the present invention therefore shows an excellent stability at high temperature and a better corrosion resistance preventing scales from being formed helping the formation of the austenitic matrix.
- Molybdenum in the percentages shown above, is the most effective element for improving the resistance of the cast iron according to the present invention and for improving its toughness.
- Molybdenum forms intercrystalline carbides and it easily segregates together with chromes in eutectic phosphides.
- molybdenum added in percentages from 0,9% to 1,1% improves the heat resistance and it provides a good wear resistance.
- Niobium the fact of adding it in percentage from 0,3% to 0,5% into the formulation of the cast iron according to the present invention mainly aims at improving the mechanical properties thereof reducing the size of eutectic cells.
- Tungsten in the percentages shown above, provides the cast iron according to the present invention with an optimal corrosion resistance and most of mineral acids affect it only weakly.
- Tungsten considerably increases the hardness and the high melting temperature makes it a choice very suitable for structural applications subjected to high temperatures, such as those the present invention relates to, such as for instance turbo manifolds, exhaust manifolds for turbines in the "automotive” field or the like. Its high elastic modulus is exploited at low temperatures.
- Tungsten in percentages from about 0.5% to 0.7% provides a good creep resistance.
- the high-alloy spheroidal graphite cast iron having an austenitic structure according to the present invention further comprises the following ingredients in the following percentages by weight:
- Niobium (Nb) equal to 0,4% Carbon (C) equal to 1,7% Chrome (Cr) equal to 2,0% Molybdenum (Mo) equal to 1,0% Nickel (Ni) equal to 36% Silicon (Si) equal to 6,4% Tungsten (W) equal to 0,6% Manganese (Mn) equal to 0,55%
- Tab.1 Temperatures [°C] Yield Strenght [Mpa] Invention AISI 309S EN-GJSA-XNiSiCr35-5-2 20 493 621 480 200 461 531 400 458 510 600 348 414 325 800 203 186 155 900 82 54 940 78 110 35 980 63 1020 45 59
- the yield strength 1 of the cast iron according to the present invention is always higher than that of known NR cast iron.
- the yield strength of the cast iron according to the present invention is even higher than that of the more expensive IS Steel, thus actually making the cast iron according to the present invention not only cheaper than Steel, but also more resistant as regards specific applications.
- the cast iron according to the present invention has a yield strength lower than that of IS Steel, but still sufficient for making turbo manifolds and exhaust manifolds in the automotive field.
- the cast iron according to the present invention is a privileged choice for making such mechanical components.
Landscapes
- 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)
Claims (5)
- Fonte fortement alliée à graphite sphéroïdal, à structure austénitique,
caractérisée en ce que
elle contient les constituants suivants, en pourcentages de poids:Chrome (Cr), de 1,6 % à 2,0 %Molybdène (Mo), de 0,9 % à 1,1 %Niobium (Nb), de 0,3 % à 0,5 %Nickel (Ni), de 34 % à 36 %Silicium (Si), de 6,1 % à 6,7 %Carbone (C), de 1,6 % à 2,0 %Tungstène (W), de 0,5 % à 0,7 %Manganèse (Mn), de 0,5 % à 0,65 %contenant éventuellement en outredu Phosphore (P) ≤ 0,1 %du Cuivre (Cu) ≤ 0,1%le reste de la composition de la fonte étant constitué de fer. - Fonte selon la revendication 1, contenant les constituants suivants, en pourcentages de poids :Niobium (Nb), égal à 0,4 %Carbone (C), égal à 1,7 %Chrome (Cr), égal à 2,0 %Molybdène (Mo), égal à 1,0 %Nickel (Ni), égal à 36 %Silicium (Si), égal à 6,4 %Tungstène (W), égal à 0,6 %Manganèse (Mn), égal à 0,55 %.
- Utilisation de fonte selon l'une quelconque des revendications précédentes pour fabriquer une pièce réalisée au moins en partie par une opération de moulage.
- Pièce, caractérisée en ce qu'elle comporte au moins une partie en fonte selon une ou plusieurs des revendications précédentes.
- Collecteur d'échappement, turbine ou collecteur turbo pour moteur à combustion interne, caractérisé en ce qu'au moins une partie est en fonte selon une ou plusieurs des revendications précédentes.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI201230379T SI2710164T1 (sl) | 2011-05-17 | 2012-05-15 | Močno legirana kroglasto grafitna železova litina, ki ima avstenitno strukturo, uporaba omenjenega litega železa za izdelavo strukturnih komponent in strukturna komponenta narejena iz omenjenega litega železa |
PL12726221T PL2710164T3 (pl) | 2011-05-17 | 2012-05-15 | Wysokostopowe żeliwo sferoidalne z grafitem mające austenityczną strukturę, zastosowanie tego żeliwa do wytwarzania strukturalnych elementów i strukturalne elementy wytworzone z tego żeliwa |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000861A ITMI20110861A1 (it) | 2011-05-17 | 2011-05-17 | Ghisa a grafite sferoidale ad alto tenore di legante con struttura austenitica, uso di detta ghisa per la fabbricazione di componenti strutturali e componente strutturale realizzato con detta ghisa |
PCT/IB2012/052429 WO2012156910A2 (fr) | 2011-05-17 | 2012-05-15 | Fonte à graphite sphéroïdal fortement alliée ayant une structure austénitique, utilisation de ladite fonte pour fabriquer des composants structuraux et composant structural constitué de ladite fonte |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2710164A2 EP2710164A2 (fr) | 2014-03-26 |
EP2710164B1 true EP2710164B1 (fr) | 2015-09-09 |
Family
ID=44554485
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12726221.0A Not-in-force EP2710164B1 (fr) | 2011-05-17 | 2012-05-15 | Fonte à graphite sphéroïdal fortement alliée ayant une structure austénitique, utilisation de ladite fonte pour fabriquer des composants structuraux et composant structural constitué de ladite fonte |
Country Status (11)
Country | Link |
---|---|
EP (1) | EP2710164B1 (fr) |
CN (1) | CN103687972A (fr) |
BR (1) | BR112013029563A2 (fr) |
ES (1) | ES2555481T3 (fr) |
HU (1) | HUE028165T2 (fr) |
IT (1) | ITMI20110861A1 (fr) |
PL (1) | PL2710164T3 (fr) |
PT (1) | PT2710164E (fr) |
RS (1) | RS54426B1 (fr) |
SI (1) | SI2710164T1 (fr) |
WO (1) | WO2012156910A2 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103952616B (zh) * | 2014-04-24 | 2015-08-26 | 吉首长潭泵业有限公司 | 耐腐蚀耐磨合金铸铁制备方法 |
CN104561752A (zh) * | 2014-12-25 | 2015-04-29 | 山东滨州渤海活塞股份有限公司 | 一种活塞用稀有难熔金属增强奥氏体铸铁材料及制备方法 |
DE102016215905A1 (de) * | 2016-08-24 | 2018-03-01 | Continental Automotive Gmbh | Eisen-Werkstoff für hochtemperaturfeste Lagerbuchsen, Lagerbuchse aus diesem Werkstoff und Abgasturbolader mit einer solchen Lagerbuchse |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1928639B1 (de) * | 1969-06-06 | 1970-10-22 | Deutsche Edelstahlwerke Ag | Verfahren zum Waermebehandeln eines nickelhaltigen austenitischen Gusseisenwerkstoffs mit erhoehter Kriechfestigkeit |
JPS619550A (ja) * | 1984-06-22 | 1986-01-17 | Ebara Corp | 耐応力腐食割れオ−ステナイト鋳鉄製機器 |
JPS619584A (ja) * | 1984-06-22 | 1986-01-17 | Ebara Corp | オ−ステナイト鋳鉄機器の応力腐食割れを防止する方法 |
EP1652949A4 (fr) * | 2003-07-18 | 2008-06-25 | Hitachi Metals Ltd | Fonte graphitee spheroidale austenitique resistant a la chaleur |
JP5232620B2 (ja) * | 2008-12-18 | 2013-07-10 | 三菱重工業株式会社 | 球状黒鉛鋳鉄 |
-
2011
- 2011-05-17 IT IT000861A patent/ITMI20110861A1/it unknown
-
2012
- 2012-05-15 ES ES12726221.0T patent/ES2555481T3/es active Active
- 2012-05-15 HU HUE12726221A patent/HUE028165T2/en unknown
- 2012-05-15 RS RS20150813A patent/RS54426B1/en unknown
- 2012-05-15 CN CN201280023616.XA patent/CN103687972A/zh active Pending
- 2012-05-15 EP EP12726221.0A patent/EP2710164B1/fr not_active Not-in-force
- 2012-05-15 BR BR112013029563A patent/BR112013029563A2/pt not_active IP Right Cessation
- 2012-05-15 PT PT127262210T patent/PT2710164E/pt unknown
- 2012-05-15 PL PL12726221T patent/PL2710164T3/pl unknown
- 2012-05-15 WO PCT/IB2012/052429 patent/WO2012156910A2/fr active Application Filing
- 2012-05-15 SI SI201230379T patent/SI2710164T1/sl unknown
Also Published As
Publication number | Publication date |
---|---|
PT2710164E (pt) | 2015-12-28 |
ITMI20110861A1 (it) | 2012-11-18 |
WO2012156910A2 (fr) | 2012-11-22 |
ES2555481T3 (es) | 2016-01-04 |
WO2012156910A3 (fr) | 2013-01-10 |
PL2710164T3 (pl) | 2016-05-31 |
BR112013029563A2 (pt) | 2017-03-21 |
SI2710164T1 (sl) | 2016-02-29 |
RS54426B1 (en) | 2016-04-28 |
EP2710164A2 (fr) | 2014-03-26 |
CN103687972A (zh) | 2014-03-26 |
HUE028165T2 (en) | 2016-12-28 |
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