EP0255597B1 - Aciers à très basse teneur en éléments d'alliage - Google Patents

Aciers à très basse teneur en éléments d'alliage Download PDF

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Publication number
EP0255597B1
EP0255597B1 EP87109046A EP87109046A EP0255597B1 EP 0255597 B1 EP0255597 B1 EP 0255597B1 EP 87109046 A EP87109046 A EP 87109046A EP 87109046 A EP87109046 A EP 87109046A EP 0255597 B1 EP0255597 B1 EP 0255597B1
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EP
European Patent Office
Prior art keywords
steels
break
temperatures
joules
grain
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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.)
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EP87109046A
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German (de)
English (en)
Other versions
EP0255597A2 (fr
EP0255597A3 (en
Inventor
Bernd Dr. Ing. Huchtemann
Serosh Dr. Ing. Engineer
Volker Dipl.-Ing. Schüler
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Thyssen Stahl AG
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Thyssen Edelstahlwerke AG
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Application filed by Thyssen Edelstahlwerke AG filed Critical Thyssen Edelstahlwerke AG
Priority to AT87109046T priority Critical patent/ATE70567T1/de
Publication of EP0255597A2 publication Critical patent/EP0255597A2/fr
Publication of EP0255597A3 publication Critical patent/EP0255597A3/de
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    • 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
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium

Definitions

  • the invention relates to micro-alloyed pearlitic steels as a material for molded parts, which are preferably obtained by massive forming by forging in a die at high temperatures.
  • the invention has for its object to provide steels which have a high fine grain resistance up to temperatures of 1300 ° C and thus in combination high strength and high toughness in large-scale production.
  • the microalloyed pearlitic steels according to the invention have the following composition: 0.20 to 0.50% C, 0.40 to 1.0% Si, 0.80 to 1.80% Mn, 0.008 to 0.2% S, 0 to 0 , 7% Cr, 0 to 0.1% Al, 0 to 0.04% N, 0.01 to 0.05% Ti, optionally 0 to 0.20% V and or 0 to 0.10% Nb, rest Iron and impurities due to melting, whereby mixed sulfides (manganese, titanium carbonitride, etc.) are excreted on the grain boundaries.
  • the steel can preferably contain up to 0.20% V and / or 0.10% Nb.
  • Such steels can solidify at a solidification rate in the range from 3 to 25 mm / min in such a way that sulfides are separated out in finely divided form between the liquidus and solidus temperatures.
  • the fine distribution This phase is responsible for the high fine grain resistance and the resulting combination of high strength and high toughness (Fig. 1).
  • a steel is preferably selected from the following range: 0.20 to 0.35% C, 0.50 to 0.80% Si, 1.00 to 1.70% Mn, 0.01 to 0.09% S, 0 , 20 to 0.50% Cr, 0.015 to 0.06% Al, 0.015 to 0.030% N, 0.05 to 0.15% V and / or 0.02 to 0.10% Nb, 0.01 to 0 , 04% Ti, remainder iron including impurities due to melting.
  • Steels from the following range are also preferred: 0.35 to 0.45% C, 0.5 to 0.8% Si, 1.0 to 1.7% Mn, 0.01 to 0.09% S, 0, 2 to 0.5% Cr, 0.015 to 0.06% Al, 0.015 to 0.030% N, 0.05 to 0.15% V and / or 0.02 to 0.10% Nb, 0.01 to 0, 04% Ti, remainder iron including melting-related impurities.
  • the steels according to the invention are therefore outstandingly suitable for use in automotive components.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Laminated Bodies (AREA)
  • Liquid Crystal Substances (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Heat Treatment Of Articles (AREA)

Claims (5)

1. Acier de construction micro-allié ayant une grande stabilité de grain fin jusqu'à 1.300°C, composé de
Figure imgb0005
le reste étant du fer et des impuretés liées à l'élaboration, des mélanges de sulfures se déposant sur les joints des grains.
2. Acier selon la revendication 1, caractérisé en ce qu'il contient jusqu'à 0,2 % de vanadium et/ou jusqu'à 0,1 % de niobium.
3. Acier selon la revendication 1 ou 2, contenant 0,20 à 0,35 % de C, 0,5 à 0,8 % de Si, 1,0 à 1,7 % de Mn, 0,01 à 0,09 % de S, 0,2 à 0,5 % de Cr, 0,015 à 0,06 % d'Al, 0,015 à 0,030 % de N, 0,05 à 0,15 % de V et/ou 0,02 à 0,10% de Nb, 0,01 à 0,04 % de Ti, le reste étant du fer, y compris des impuretés liées à l'élaboration, qui présente une grande stabilité de grain fin jusqu'à la température de déformation ou température d'incandescence de 1.300°C et atteint une résistance à la traction d'au moins 800 N/mm², une limite élastique 0,2 % d'au moins 550 N/mm², un allongement à la rupture d'au moins 15 % et une striction d'au moins 45 % malgré une énergie de choc, à la température ambiante, d'au moins 35 joules sur des éprouvettes selon DVM.
4. Acier selon la revendication 1 ou 2, contenant 0,35 à 0,45 % de C, 0,5 à 0,8 % de Si, 1,0 à 1,7 % de Mn, 0,01 à 0,09 % de S, 0,2 à 0,5 % de Cr, 0,015 à 0,06 % d'Al, 0,015 à 0,030 % de N, 0,05 à 0,15 % de V et/ou 0,02 à 0,10% de Nb, 0,01 à 0,04 % de Ti, le reste étant du fer, y compris des impuretés liées à l'élaboration, qui présente une grande stabilité de grain fin jusqu'à la température de déformation ou température d'incandescence de 1.300°C et atteint une résistance à la traction d'au moins 850 N/mm², une limite élastique 0,2 % d'au moins 600 N/mm², un allongement à la rupture d'au moins 12 % et une striction d'au moins 40 % malgré une énergie de choc, à la température ambiante, d'au moins 25 joules sur des éprouvettes selon DVM.
5. Aciers selon les revendications 1 à 4 pour une utilisation comme éléments de construction dans l'industrie automobile.
EP87109046A 1986-07-05 1987-06-24 Aciers à très basse teneur en éléments d'alliage Expired - Lifetime EP0255597B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87109046T ATE70567T1 (de) 1986-07-05 1987-06-24 Mikrolegierte staehle.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3622735 1986-07-05
DE3622735 1986-07-05
DE3719569 1987-06-12
DE3719569A DE3719569C2 (de) 1986-07-05 1987-06-12 Mikrolegierte Stähle.

Publications (3)

Publication Number Publication Date
EP0255597A2 EP0255597A2 (fr) 1988-02-10
EP0255597A3 EP0255597A3 (en) 1989-01-11
EP0255597B1 true EP0255597B1 (fr) 1991-12-18

Family

ID=25845343

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87109046A Expired - Lifetime EP0255597B1 (fr) 1986-07-05 1987-06-24 Aciers à très basse teneur en éléments d'alliage

Country Status (8)

Country Link
US (1) US4838963A (fr)
EP (1) EP0255597B1 (fr)
KR (1) KR880003023A (fr)
AT (1) ATE70567T1 (fr)
DE (2) DE3719569C2 (fr)
ES (1) ES2027998T3 (fr)
FI (1) FI88625B (fr)
GR (1) GR3003399T3 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5221373A (en) * 1989-06-09 1993-06-22 Thyssen Edelstahlwerke Ag Internal combustion engine valve composed of precipitation hardening ferritic-pearlitic steel
DE4014072A1 (de) * 1989-06-09 1990-12-20 Thyssen Edelstahlwerke Ag Verwendung von ausscheidungshaertenden ferritisch-perlitischen (afp-)staehlen als werkstoff fuer gaswechselventile von verbrennungsmotoren
DE4017973A1 (de) * 1989-06-09 1990-12-13 Thyssen Edelstahlwerke Ag Verwendung von afp-staehlen fuer erhoehten temperaturen ausgesetzte bauteile
DE4109628C2 (de) * 1990-07-12 1997-04-17 Mahle Gmbh Verwendung eines ausscheidungshärtenden ferritisch perlitischen Stahls
DE4024381C2 (de) * 1990-08-01 1999-01-28 Mahle Gmbh Kolben für Verbrennungsmotoren mit geschmiedeten Bereichen aus Stahl
US5136992A (en) * 1990-07-12 1992-08-11 Mahle Gmbh Piston for internal combustion engines with forged sections made of steel
DE4137240A1 (de) * 1991-11-13 1993-05-19 Thyssen Edelstahlwerke Ag Verwendung von afp-staehlen fuer die herstellung von werkzeugen
US5282906A (en) * 1992-01-16 1994-02-01 Inland Steel Company Steel bar and method for producing same
ES2128240B1 (es) * 1996-07-26 2000-01-01 Gsb Grupo Siderurgico Vasco S Procedimiento de fabricacion de aceros microaleados.
US6083455A (en) * 1998-01-05 2000-07-04 Sumitomo Metal Industries, Ltd. Steels, steel products for nitriding, nitrided steel parts
DE102006007148A1 (de) * 2006-02-16 2007-08-30 Volkswagen Ag Kolben für Verbrennungsmotoren und Verfahren zur Herstellung eines Kolbens für Verbrennungsmotoren
CN100469918C (zh) * 2007-05-28 2009-03-18 无锡市恒特力金属制品有限公司 Nb微合金化高强度粉末冶金材料
JP4609585B2 (ja) * 2008-06-06 2011-01-12 住友金属工業株式会社 軟窒化用鋼、軟窒化用鋼材およびクランクシャフト
US8241442B2 (en) 2009-12-14 2012-08-14 Arcelormittal Investigacion Y Desarrollo, S.L. Method of making a hypereutectoid, head-hardened steel rail

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1608162B1 (de) * 1967-11-13 1972-06-29 Hoesch Ag Verwendung von flachstahlprodukten
SE349059B (fr) * 1968-11-22 1972-09-18 Nippon Kokan Kk
GB1342582A (en) * 1970-03-20 1974-01-03 British Steel Corp Rail steel
US3773500A (en) * 1970-03-26 1973-11-20 Nippon Steel Corp High tensile steel for large heat-input automatic welding and production process therefor
DE2428995B2 (de) * 1974-06-15 1978-10-05 Ferrotest Gmbh, Basel (Schweiz) Verwendung eines naturharten Stahles für schweißgeeigneten Betonstahl mit hoher Dauerschwingfertigkeit
JPS5638448A (en) * 1979-09-03 1981-04-13 Nippon Steel Corp Nonrefined tough steel
JPS5716114A (en) * 1980-07-03 1982-01-27 Daido Steel Co Ltd Manufacture of steel for hardening by high frequency

Also Published As

Publication number Publication date
ATE70567T1 (de) 1992-01-15
DE3719569A1 (de) 1988-01-21
KR880003023A (ko) 1988-05-13
DE3719569C2 (de) 1988-06-23
US4838963A (en) 1989-06-13
ES2027998T3 (es) 1992-07-01
FI88625B (fi) 1993-02-26
EP0255597A2 (fr) 1988-02-10
DE3775298D1 (de) 1992-01-30
FI872933A0 (fi) 1987-07-02
GR3003399T3 (en) 1993-02-17
FI872933L (fi) 1988-01-06
EP0255597A3 (en) 1989-01-11

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