EP0616040A1 - Treating method of cast iron with lamellar graphite to produce cam shafts - Google Patents

Treating method of cast iron with lamellar graphite to produce cam shafts Download PDF

Info

Publication number
EP0616040A1
EP0616040A1 EP94400552A EP94400552A EP0616040A1 EP 0616040 A1 EP0616040 A1 EP 0616040A1 EP 94400552 A EP94400552 A EP 94400552A EP 94400552 A EP94400552 A EP 94400552A EP 0616040 A1 EP0616040 A1 EP 0616040A1
Authority
EP
European Patent Office
Prior art keywords
cast iron
lamellar graphite
iron
deoxidizing element
weight
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.)
Granted
Application number
EP94400552A
Other languages
German (de)
French (fr)
Other versions
EP0616040B1 (en
Inventor
Yves Desalos
Dominique Dabouineau
Joel Legal
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.)
Renault SAS
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
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 Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of EP0616040A1 publication Critical patent/EP0616040A1/en
Application granted granted Critical
Publication of EP0616040B1 publication Critical patent/EP0616040B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/08—Manufacture of cast-iron

Definitions

  • the invention relates to a process for treating a lamellar graphite cast iron intended for the manufacture of camshafts according to which the said cast iron is brought to the melting temperature before extracting the oxides from the cast iron after settling.
  • the invention relates more particularly to the process for treating such a lamellar graphite cast iron in order to prepare the camshafts for a surface reflow treatment.
  • the publication FR-A-2 292 043 describes a process for adding 15 to 50% by weight of magnesium particles to the molten metal preceding the casting operation.
  • the addition of such an amount of magnesium in a cast iron with lamellar graphite makes it possible to deoxidize the cast iron but transforms the lamellar graphite into nodular or spheroidal graphite.
  • the subject of the invention is the production of camshafts of cast iron with lamellar graphite, the machining of which is easier than the machining carried out on camshafts of cast iron with nodular or spheroidal graphite.
  • the subject of the invention is also the production of camshafts of cast iron with lamellar graphite capable of undergoing a surface reflow treatment giving said camshafts a much greater hardness, without causing the creation of defects in particular in the structure of the parts. finished.
  • the object of the invention is therefore to deoxidize the lamellar graphite cast iron before it is cast, without modifying the lamellar structure of the graphite, with the aim of eliminating the defects generated during the surface reflow treatment.
  • the deoxidizing element when the cast iron has a high sulfur content, the deoxidizing element, introduced in small quantities, reacts only with the sulfur.
  • the object of the invention is therefore to provide an addition of a deoxidizing element in a very low sulfur cast iron.
  • the process is characterized by the fact that 0.001% to 0.02% by weight of a deoxidizing element is introduced before casting into the iron bath in order to obtain a low-lamellar graphite cast iron. oxygen and nitrogen content.
  • the process consists of a first step of melting the lamellar graphite cast iron which is brought to a melting temperature of around 1500 ° C.
  • the metal bath obtained after melting undergoes desulfurization.
  • This desulphurization can be carried out, for example, by adding a desulphurizing agent introduced inside a fusible conduit with bubbling of an inert gas, the temperature being maintained around 1420 ° C, so as to obtain at the end of this treatment a sulfur content of less than 0.035% by weight.
  • the process continues with decantation lasting twenty minutes, which allows the oxides present in the cast iron to be extracted in the form of precipitates, such as MgO, MgS, etc.
  • This deoxidation does not reach dissolved gases, such as oxygen or nitrogen dioxide.
  • the decantation carried out is followed by a temperature rise which allows the addition of a deoxidizing element consisting of magnesium in the form of an alloy containing from 5 to 30% by weight of magnesium.
  • the deoxidizing element consists of cerium.
  • the deoxidizing element consists of barium.
  • the deoxidizing element consists of calcium.
  • the addition of magnesium is carried out for example by using a fusible conduit.
  • the magnesium thus introduced forms complexes with the oxides remaining in the cast iron, which are inert during a surface reflow treatment.
  • Camshafts whose area occupied by faults is less than 1% of the area of the camshaft are considered to be "acceptable” defects. without adding Mg addition of Mg + desulfurization addition of Mg (S ⁇ 0.035%) % of parts without defects 10 69 75 % of "acceptable" parts 40 28 25 % of discarded parts 50 3 0

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

Process for treating cast iron with lamellar graphite intended for the manufacture of camshafts, according to which the said cast iron is heated to melting temperature before extracting, after decanting, the oxides from the cast iron, characterised in that 0.001 % to 0.02 % by weight of a deoxidising element is introduced into the cast iron bath before the casting with the aim of obtaining cast iron with lamellar graphite with a low oxygen and nitrogen content.

Description

L'invention concerne un procédé de traitement d'une fonte à graphite lamellaire destinée à la fabrication des arbres à cames selon lequel on porte à la température de fusion ladite fonte avant d'extraire après décantation les oxydes de la fonte.The invention relates to a process for treating a lamellar graphite cast iron intended for the manufacture of camshafts according to which the said cast iron is brought to the melting temperature before extracting the oxides from the cast iron after settling.

L'invention concerne plus particulièrement le procédé de traitement d'une telle fonte à graphite lamellaire dans le but de préparer les arbres à cames à un traitement de refusion superficielle.The invention relates more particularly to the process for treating such a lamellar graphite cast iron in order to prepare the camshafts for a surface reflow treatment.

La publication FR-A-2 292 043 décrit un procédé d'addition de 15 à 50% en poids de particules de magnésium au métal fondu précédent l'opération de coulée.
L'addition d'une telle quantité de magnésium dans une fonte à graphite lamellaire permet de désoxyder la fonte mais transforme le graphite lamellaire en graphite nodulaire ou sphéroïdal.The publication FR-A-2 292 043 describes a process for adding 15 to 50% by weight of magnesium particles to the molten metal preceding the casting operation.
The addition of such an amount of magnesium in a cast iron with lamellar graphite makes it possible to deoxidize the cast iron but transforms the lamellar graphite into nodular or spheroidal graphite.

L'invention a pour objet la réalisation des arbres à cames en fonte à graphite lamellaire dont l'usinage est plus aisé que l'usinage effectué sur des arbres à cames en fonte à graphite nodulaire ou sphéroïdal.The subject of the invention is the production of camshafts of cast iron with lamellar graphite, the machining of which is easier than the machining carried out on camshafts of cast iron with nodular or spheroidal graphite.

L'invention a également pour objet la réalisation d'arbres à cames en fonte à graphite lamellaire susceptibles de subir un traitement de refusion superficielle conférant auxdits arbres à cames une dureté beaucoup plus importante, sans engendrer la création de défauts notamment dans la structure des pièces finies.The subject of the invention is also the production of camshafts of cast iron with lamellar graphite capable of undergoing a surface reflow treatment giving said camshafts a much greater hardness, without causing the creation of defects in particular in the structure of the parts. finished.

Ces défauts sont dûs à la présence de gaz dissous, tels que l'oxygène et l'azote, présents dans les pièces brutes d'arbres à came lors du traitement de refusion superficielle.These defects are due to the presence of dissolved gases, such as oxygen and nitrogen, present in the raw parts of camshafts during the surface reflow treatment.

L'invention a ainsi pour objet de désoxyder la fonte à graphite lamellaire avant sa coulée, sans modifier la structure lamellaire du graphite, dans le but de supprimer les défauts générés lors du traitement de refusion superficielle.The object of the invention is therefore to deoxidize the lamellar graphite cast iron before it is cast, without modifying the lamellar structure of the graphite, with the aim of eliminating the defects generated during the surface reflow treatment.

Néanmoins lorsque la fonte possède une forte teneur en soufre, l'élément désoxydant, introduit en faible quantité, réagit seulement avec le soufre.However, when the cast iron has a high sulfur content, the deoxidizing element, introduced in small quantities, reacts only with the sulfur.

L'invention a donc pour objet de réaliser une addition d'un élément désoxydant dans une fonte à très faible teneur en soufre.The object of the invention is therefore to provide an addition of a deoxidizing element in a very low sulfur cast iron.

Selon l'invention, le procédé est caractérisé par le fait que l'on introduit avant la coulée dans le bain de fonte 0.001% à 0.02% en poids d'un élément désoxydant dans le but d'obtenir une fonte à graphite lamellaire à basse teneur d'oxygène et d'azote.According to the invention, the process is characterized by the fact that 0.001% to 0.02% by weight of a deoxidizing element is introduced before casting into the iron bath in order to obtain a low-lamellar graphite cast iron. oxygen and nitrogen content.

Ce procédé s'applique en particulier à la fonte de composition : C % Si % P % Mn % Cr % Cu % Sn % V % Mo % Autres % 2,6-3,5 1,6-2,8 0-0,15 0-1 0-0,6 0-1 0-0,2 0-0,2 0-0,6 0-0,3 This process applies in particular to the melting of composition: VS % Yes % P% Mn% Cr% Cu% Sn% V% MB% Others% 2.6-3.5 1.6-2.8 0-0.15 0-1 0-0.6 0-1 0-0.2 0-0.2 0-0.6 0-0.3

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description d'un exemple de réalisation du procédé.Other characteristics and advantages of the invention will appear on reading the description of an exemplary embodiment of the method.

Le procédé consiste en une première étape de fusion de la fonte à graphite lamellaire qui est portée à une température de fusion d'environ 1500°C.The process consists of a first step of melting the lamellar graphite cast iron which is brought to a melting temperature of around 1500 ° C.

Selon une variante du procédé, lorsque la teneur en soufre de la fonte à graphite lamellaire initiale est supérieure à 0.035% en poids, le bain métallique obtenu après fusion subit une désulfuration.According to a variant of the process, when the sulfur content of the initial lamellar graphite cast iron is greater than 0.035% by weight, the metal bath obtained after melting undergoes desulfurization.

Cette désulfuration peut être réalisée, à titre d'exemple, par addition d'un agent désulfurant introduit à l'intérieur d'un conduit fusible avec barbotage d'un gaz inerte, la température étant maintenue aux environs de 1420°C, de sorte à obtenir à l'issue de ce traitement une teneur en soufre inférieure à 0.035 % en poids.This desulphurization can be carried out, for example, by adding a desulphurizing agent introduced inside a fusible conduit with bubbling of an inert gas, the temperature being maintained around 1420 ° C, so as to obtain at the end of this treatment a sulfur content of less than 0.035% by weight.

Le procédé se poursuit par une décantation d'une durée d'une vingtaine de minutes qui permet d'extraire les oxydes présents dans le bain de fonte sous forme de précipités, tels que MgO, MgS, etc...The process continues with decantation lasting twenty minutes, which allows the oxides present in the cast iron to be extracted in the form of precipitates, such as MgO, MgS, etc.

Cette désoxydation n'atteint pas les gaz dissous, tels que le dioxyde d'oxygène ou d'azote.This deoxidation does not reach dissolved gases, such as oxygen or nitrogen dioxide.

La décantation effectuée est suivie d'une montée de température qui permet l'addition d'un élément désoxydant constitué par du magnésium sous forme d'un alliage contenant de 5 à 30% en poids de magnésium.The decantation carried out is followed by a temperature rise which allows the addition of a deoxidizing element consisting of magnesium in the form of an alloy containing from 5 to 30% by weight of magnesium.

Selon une variante de réalisation du procédé, l'élément désoxydant est constitué par du cérium.According to an alternative embodiment of the process, the deoxidizing element consists of cerium.

Selon une autre variante de réalisation du procédé, l'élément désoxydant est constitué par du baryum.According to another alternative embodiment of the method, the deoxidizing element consists of barium.

Selon une troisième variante de réalisation du procédé, l'élément désoxydant est constitué par du calcium.According to a third alternative embodiment of the method, the deoxidizing element consists of calcium.

On décrira à titre d'exemple le procédé pour lequel l'élément désoxydant est constitué par du magnésium.The process for which the deoxidizing element consists of magnesium will be described by way of example.

L'addition de magnésium est effectuée par exemple par utilisation d'un conduit fusible.The addition of magnesium is carried out for example by using a fusible conduit.

Le magnésium ainsi introduit forme des complexes avec les oxydes restants dans la fonte, qui sont inertes lors d'un traitement de refusion superficielle.The magnesium thus introduced forms complexes with the oxides remaining in the cast iron, which are inert during a surface reflow treatment.

Ainsi lors de la refusion superficielle à l'arc, l'oxygène et l'azote ne sont en surface que dans une très faible proportion qui ne provoque pas de création de défauts.Thus during surface reflow with arc, oxygen and nitrogen are only on the surface in a very small proportion which does not cause the creation of defects.

Le nombre d'arbres à cames fabriqués sans défauts, avec une teneur en défauts "acceptable" ou rebutés à l'issue du traitement de refusion superficielle réalisé par une refusion à l'arc permet de mettre en évidence les performances obtenues à l'aide de ce procédé.The number of camshafts produced without defects, with an "acceptable" defect content or discarded after the surface reflow treatment carried out by an arc reflow makes it possible to demonstrate the performances obtained using of this process.

Sont considérées comme teneur de défauts "acceptables" les arbres à came dont la surface occupée par les défauts est inférieure à 1% de la surface de l'arbre à came. sans ajout de Mg ajout de Mg + désulfuration ajout de Mg (S<0.035%) % de pièces sans défauts 10 69 75 % de pièces "acceptables" 40 28 25 % de pièces rebutées 50 3 0 Camshafts whose area occupied by faults is less than 1% of the area of the camshaft are considered to be "acceptable" defects. without adding Mg addition of Mg + desulfurization addition of Mg (S <0.035%) % of parts without defects 10 69 75 % of "acceptable" parts 40 28 25 % of discarded parts 50 3 0

Il apparaît clairement que la quantité de défauts sur les arbres à cames diminue visiblement lors de l'ajout de magnésium et que la fonte à graphite lamellaire, qui possède initialement une faible teneur en soufre, engendre moins de défauts que la fonte à graphite lamellaire ayant subi une désulfuration pour aboutir à cette faible teneur en soufre.It is clear that the quantity of defects on the camshafts visibly decreases with the addition of magnesium and that cast iron with lamellar graphite, which initially has a low sulfur content, causes fewer defects than cast iron with lamellar graphite having undergone desulfurization to result in this low sulfur content.

Claims (8)

1) Procédé de traitement d'une fonte à graphite lamellaire destinée à la fabrication des arbres à cames selon lequel on porte à la température de fusion ladite fonte avant d'extraire après décantation les oxydes de la fonte, caractérisé par le fait que l'on introduit avant la coulée dans le bain de fonte dont la teneur en soufre est inférieure à 0.035% en poids, 0.001% à 0.02% en poids d'un élément désoxydant dans le but d'obtenir une fonte à graphite lamellaire à basse teneur d'oxygène et d'azote. 1) Process for the treatment of a lamellar graphite cast iron intended for the manufacture of camshafts, according to which the said cast iron is brought to the melting temperature before extracting the oxides from the cast iron after settling, characterized in that the a deoxidizing element is introduced before casting into the iron bath, the sulfur content of which is less than 0.035% by weight, 0.001% to 0.02% by weight of a deoxidizing element, in order to obtain a low-content lamellar graphite iron and nitrogen. 2) Procédé selon la revendication 1, caractérisé en ce que la fonte à traiter possède la composition : C % Si % P % Mn % Cr % Cu % Sn % V % Mo % Autres % 2,6-3,5 1,6-2,8 0-0,15 0-1 0-0,6 0-1 0-0,2 0-0,2 0-0,6 0-0,3
2) Method according to claim 1, characterized in that the cast iron to be treated has the composition: VS % Yes % P% Mn% Cr% Cu% Sn% V% MB% Others% 2.6-3.5 1.6-2.8 0-0.15 0-1 0-0.6 0-1 0-0.2 0-0.2 0-0.6 0-0.3
3) Procédé selon l'une quelconque des revendications 1 ou 2, caractérisé par le fait que l'éléments désoxydants sont additionnés sous forme d'un alliage dont la teneur en cesdits éléments est comprise entre 5 et 30% en poids. 3) Method according to any one of claims 1 or 2, characterized in that the deoxidizing elements are added in the form of an alloy whose content of said elements is between 5 and 30% by weight. 4) Procédé selon l'une quelconque des revendications 1 à 3, caractérisé par le fait que l'addition d'éléments désoxydants dans le bain de fonte est précédée d'une opération de désulfuration du bain de fonte lorsque la fonte à graphite lamellaire initiale a une teneur en soufre supérieure à 0.035% en poids. 4) Method according to any one of claims 1 to 3, characterized in that the addition of deoxidizing elements in the iron bath is preceded by a desulfurization operation of the iron bath when the initial lamellar graphite iron has a sulfur content greater than 0.035% by weight. 5) Procédé selon l'une quelconque des revendications 1 à 4, caractérisé par le fait que l'élément désoxydant est constitué par du magnésium. 5) Method according to any one of claims 1 to 4, characterized in that the deoxidizing element consists of magnesium. 6) Procédé selon l'une quelconque des revendications 1 à 4, caractérisé par le fait que l'élément désoxydant est constitué par du calcium. 6) Method according to any one of claims 1 to 4, characterized in that the deoxidizing element consists of calcium. 7) Procédé selon l'une quelconque des revendications 1 à 4, caractérisé par le fait que l'élément désoxydant est constitué par du baryum. 7) Method according to any one of claims 1 to 4, characterized in that the deoxidizing element consists of barium. 8) Procédé selon l'une quelconque des revendications 1 à 4, caractérisé par le fait que l'élément désoxydant est constitué par du cérium. 8) Method according to any one of claims 1 to 4, characterized in that the deoxidizing element consists of cerium.
EP19940400552 1993-03-19 1994-03-15 Treating method of cast iron with lamellar graphite to produce cam shafts Expired - Lifetime EP0616040B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9303182 1993-03-19
FR9303182A FR2702687B1 (en) 1993-03-19 1993-03-19 Process for treating a lamellar graphite cast iron intended for the manufacture of camshafts.

Publications (2)

Publication Number Publication Date
EP0616040A1 true EP0616040A1 (en) 1994-09-21
EP0616040B1 EP0616040B1 (en) 1999-05-19

Family

ID=9445147

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940400552 Expired - Lifetime EP0616040B1 (en) 1993-03-19 1994-03-15 Treating method of cast iron with lamellar graphite to produce cam shafts

Country Status (3)

Country Link
EP (1) EP0616040B1 (en)
DE (1) DE69418516T2 (en)
FR (1) FR2702687B1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001055458A1 (en) * 2000-01-28 2001-08-02 Subramanian Sundaresa V Process for producing gray cast iron for use in high speed machining with cubic boron nitride and silicon nitride tools and the gray cast iron so produced
FR2818663A1 (en) * 2000-12-22 2002-06-28 Mannesmann Sachs Ag GRAY CAST IRON ALLOY FOR A FRICTION ELEMENT OF A FRICTION CLUTCH AND ELEMENT THUS PRODUCED
DE102009004189A1 (en) * 2009-01-09 2010-07-22 Man Nutzfahrzeuge Ag Cast iron alloy for cylinder heads
WO2010091486A1 (en) * 2009-02-12 2010-08-19 Teksid Do Brasil Ltda Method to obtain a high resistance gray iron alloy for combustion engines and general casts
CN110894582A (en) * 2019-12-10 2020-03-20 西安工业大学 High-strength and high-heat-conductivity vermicular graphite cast iron and preparation method thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2244220A1 (en) * 1971-09-09 1973-03-22 Toyo Kogyo Co MOLDED BODY MADE OF CAST IRON WITH HARDENED SURFACES AND PROCESS FOR THEIR PRODUCTION
FR2340986A1 (en) * 1976-02-10 1977-09-09 British Cast Iron Res Ass CAST IRON AND ITS PRODUCTION PROCESS
DE3912916A1 (en) * 1988-08-03 1990-02-08 Winter Fritz Eisengiesserei Process for producing a casting from lamellar-graphite cast iron and camshaft produced thereby
JPH02258952A (en) * 1989-03-30 1990-10-19 Kubota Ltd Wear-resistant cast iron material having high elastic modulus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2244220A1 (en) * 1971-09-09 1973-03-22 Toyo Kogyo Co MOLDED BODY MADE OF CAST IRON WITH HARDENED SURFACES AND PROCESS FOR THEIR PRODUCTION
FR2340986A1 (en) * 1976-02-10 1977-09-09 British Cast Iron Res Ass CAST IRON AND ITS PRODUCTION PROCESS
DE3912916A1 (en) * 1988-08-03 1990-02-08 Winter Fritz Eisengiesserei Process for producing a casting from lamellar-graphite cast iron and camshaft produced thereby
JPH02258952A (en) * 1989-03-30 1990-10-19 Kubota Ltd Wear-resistant cast iron material having high elastic modulus

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 9048, Derwent World Patents Index; Class M27, AN 90-358321 [48] *
PATENT ABSTRACTS OF JAPAN vol. 15, no. 007 (C - 794) 9 January 1991 (1991-01-09) *

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001055458A1 (en) * 2000-01-28 2001-08-02 Subramanian Sundaresa V Process for producing gray cast iron for use in high speed machining with cubic boron nitride and silicon nitride tools and the gray cast iron so produced
US6395107B1 (en) 2000-01-28 2002-05-28 Sundaresa V. Subramanian Cast iron for use in high speed machining with cubic boron nitride and silicon nitride tools
US6537395B2 (en) 2000-01-28 2003-03-25 Sundaresa V. Subramanian Process for producing gray cast iron for use in high speed machining with cubic boron nitride and silicon nitride tools
FR2818663A1 (en) * 2000-12-22 2002-06-28 Mannesmann Sachs Ag GRAY CAST IRON ALLOY FOR A FRICTION ELEMENT OF A FRICTION CLUTCH AND ELEMENT THUS PRODUCED
US6723180B2 (en) 2000-12-22 2004-04-20 Mannesmann Sachs Ag Friction clutch comprising a friction element formed of flake graphite alloy
DE102009004189A1 (en) * 2009-01-09 2010-07-22 Man Nutzfahrzeuge Ag Cast iron alloy for cylinder heads
US9132478B2 (en) 2009-01-09 2015-09-15 Man Truck & Bus Ag Cast iron alloy for cylinder heads
DE102009004189B4 (en) * 2009-01-09 2013-07-25 Man Truck & Bus Ag Component of a cast iron alloy, in particular for cylinder heads
CN102317480A (en) * 2009-02-12 2012-01-11 泰克西多巴西有限公司 Method to obtain a high resistance gray iron alloy for combustion engines and general casts
KR20110132563A (en) * 2009-02-12 2011-12-08 텍시드 도 브라질 엘티디에이. Method to obtain a high resistance gray iron alloy for combustion engines and general casts
CN102317480B (en) * 2009-02-12 2014-04-02 泰克西多巴西有限公司 Method to obtain a high resistance gray iron alloy for combustion engines and general casts
WO2010091486A1 (en) * 2009-02-12 2010-08-19 Teksid Do Brasil Ltda Method to obtain a high resistance gray iron alloy for combustion engines and general casts
US9284617B2 (en) 2009-02-12 2016-03-15 Teksid Do Brasil Ltda. Method to obtain a high resistance gray iron alloy for combustion engines and general casts
KR101629215B1 (en) 2009-02-12 2016-06-10 텍시드 도 브라질 엘티디에이. Method to obtain a high resistance gray iron alloy for combustion engines and general casts
CN110894582A (en) * 2019-12-10 2020-03-20 西安工业大学 High-strength and high-heat-conductivity vermicular graphite cast iron and preparation method thereof
CN110894582B (en) * 2019-12-10 2021-01-05 西安工业大学 High-strength and high-heat-conductivity vermicular graphite cast iron and preparation method thereof

Also Published As

Publication number Publication date
DE69418516D1 (en) 1999-06-24
FR2702687B1 (en) 1995-04-28
DE69418516T2 (en) 1999-12-23
FR2702687A1 (en) 1994-09-23
EP0616040B1 (en) 1999-05-19

Similar Documents

Publication Publication Date Title
EP0004819B1 (en) Process for the production of ferrous alloys with improved mechanical properties by the use of lanthanum, and ferrous alloys obtained by this process
CN113337727B (en) Slag for preparing high-nitrogen steel through pressurized electroslag remelting for inhibiting burning loss of magnesium and rare earth and using method thereof
FR2706489A1 (en) Martensitic stainless steel with improved machinability.
EP0616040A1 (en) Treating method of cast iron with lamellar graphite to produce cam shafts
EP0738783A1 (en) Stainless austenitic steel suitable for the manufacture of wires
FR2690169A1 (en) Austenitic stainless steel with high machinability and improved cold deformation.
JPH10212514A (en) Production of high clean extra-low sulfur steel excellent in hydrogen induced cracking resistance
BE1006831A5 (en) Process development of a steel tool, especially for the mold steel manufacturing and obtained thereby.
JP4648820B2 (en) Method for producing extremely low sulfur chromium-containing molten steel
US3723094A (en) Electroflux slags and methods of electroflux remelting
JP2002012912A (en) Method for producing high-carbon/low-nitrogen steel
KR100485095B1 (en) Refining method of molten steel
JPH10287953A (en) Steel for machine structural use, excellent in mechanical property and drilling property
JPH09310113A (en) Refining method for highly clean stainless steel
KR980009473A (en) Refining method of low carbon, low nitrogen stainless steel
US3309194A (en) Purification of alloys
JP7328534B2 (en) steel smelting method
KR101676140B1 (en) Method for refining austenite stainless steel
US4681642A (en) Cast iron making by cerium addition
SU1683938A1 (en) Composition of electrode wire
SU379633A1 (en) METHOD OF MANUFACTURE OF LOW-CARBON ALLOYED STEEL
JP2523516B2 (en) Method for manufacturing case-hardening steel with excellent rolling fatigue
SU1650333A1 (en) Slagging mixture
RU94005993A (en) METHOD OF MANUFACTURE OF NON-CARBON ALLOYING HEAT-RESISTANT ALLOYS ON A NICKEL BASED
KR20240030303A (en) Manufacturing method of medium-high carbon steel in steelmaking process

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES GB IT

17P Request for examination filed

Effective date: 19950301

17Q First examination report despatched

Effective date: 19970801

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: RENAULT

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES GB IT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19990519

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19990519

REF Corresponds to:

Ref document number: 69418516

Country of ref document: DE

Date of ref document: 19990624

GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

Effective date: 19990519

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20000224

Year of fee payment: 7

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020101

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050315