EP0856591B1 - Acier pour le formage à froid - Google Patents

Acier pour le formage à froid Download PDF

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Publication number
EP0856591B1
EP0856591B1 EP98400178A EP98400178A EP0856591B1 EP 0856591 B1 EP0856591 B1 EP 0856591B1 EP 98400178 A EP98400178 A EP 98400178A EP 98400178 A EP98400178 A EP 98400178A EP 0856591 B1 EP0856591 B1 EP 0856591B1
Authority
EP
European Patent Office
Prior art keywords
ppm
steel
cold forming
niobium
alloy
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.)
Expired - Lifetime
Application number
EP98400178A
Other languages
German (de)
English (en)
Other versions
EP0856591A1 (fr
Inventor
Bertrand Remi
Jacques Adrien
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.)
Thyssen France SA
Original Assignee
Thyssen France SA
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
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Application filed by Thyssen France SA filed Critical Thyssen France SA
Publication of EP0856591A1 publication Critical patent/EP0856591A1/fr
Application granted granted Critical
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Anticipated expiration legal-status 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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • 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 steel for the cold forming which in particular has excellent resistance to abrasive wear.
  • WO 91 00371 A shows steels whose composition by weight percent is: C: 0.35 to 1.2; Mn: 0.3 to 3; If: 0.3 to 2; Cr: 5.0 to 11.5; Mo: 0.3 to 5.0; Nb: 0.4 to 5.0; V: 0.3 to 3.0; optionally Ta: 0.01 to 0.2; Ti: 0.01 to 0.2; Ni: 0 to 3; the rest being iron and impurities.
  • the steel according to the invention is obtained by melting and refining a steel and is characterized in that the alloy has the following weight composition: Preferred range Wide fork Carbon 1 - 1.20% 0.80 - 1.50% Manganese 0.30 - 0.50% ⁇ 1% Silicon 0.80 - 1% ⁇ 1% Phosphorus ⁇ 0.020% ⁇ 0.030% Sulfur ⁇ 0.005% ⁇ 0.005% Chromium 8 - 8.50% 6.25 - 9% Nickel ⁇ 0.30% ⁇ 0.50% Molybdenum 2 - 2.30% 1.80 - 3% Aluminum ⁇ 200ppm ⁇ 0.15% Vanadium 0.20 - 0.40% 0.20 - 0.40% Niobium 0.60 - 0.90% 0.60 - 1.5% Nitrogen ⁇ 130 ppm ⁇ 150 ppm Oxygen ⁇ 30 ppm ⁇ 50 ppm Titanium or Zirconium 500-1000 ppm 500-1500 ppm
  • the supplement being iron plus impurities characteristics of the practice of manufacturing the metal.
  • This steel is produced by electric fusion followed by a refining in a heating bag, a vacuum degassing and a slag reflow.
  • Niobium carbide In this steel, Carbon and Niobium form Niobium carbide and Titanium or Zirconium favor the production of idiomorphic Niobium carbide.
  • Niobium carbide The stoichiometric relationship for the formation of Niobium carbide is around 1% Niobium for 0.12% of Carbon. Excess Carbon is balanced by the chromium content of the steel in Molybdenum and Vanadium.
  • the steel according to the invention has a hardness greater than 60 Hrc. It has a combination of qualities; resistance abrasive wear, machinability, toughness that could not be obtained so far.
  • Tenacity is determined by a following measurement the Charpy test.
  • a 7x10x55mm reference test piece is treated at 1050 ° C, oil stop, followed by tempering for two hours at 560 ° C; she presents for a hardness greater than or equal to 60 Hrc, an energy of rupture greater than or equal to 40 Joules.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Articles (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Forging (AREA)

Description

La présente invention a pour objet un acier pour le formage à froid qui présente notamment une excellente résistance à l'usure abrasive.
WO 91 00371 A montre des aciers dont la composition en poids pour cent est : C:0,35 à 1,2; Mn: 0,3 à 3; Si: 0,3 à 2; Cr: 5,0 à 11,5; Mo: 0,3 à 5,0; Nb: 0,4 à 5,0; V: 0,3 à 3,0; facultativement Ta: 0,01 à 0,2; Ti: 0,01 à 0,2; Ni: 0 à 3; le reste étant du fer et des impuretés.
L'acier selon l'invention est obtenu par fusion et affinage d'un acier et est caractérisé en ce que l'alliage a la composition pondérale suivante :
Fourchette préférée Fourchette large
Carbone 1 - 1,20 % 0,80 - 1,50%
Manganèse 0,30 - 0,50 % < 1%
Silicium 0,80 - 1 % < 1%
Phosphore < 0,020 % ≤ 0,030%
Soufre < 0,005 % ≤ 0,005%
Chrome 8 - 8,50 % 6,25 - 9 %
Nickel < 0,30 % < 0,50%
Molybdène 2 - 2,30 % 1,80 - 3%
Aluminium < 200ppm < 0,15%
Vanadium 0,20 - 0,40 % 0,20 - 0,40%
Niobium 0,60 - 0,90 % 0,60 - 1,5%
Azote < 130 ppm < 150 ppm
Oxygène < 30 ppm < 50 ppm
Titane ou Zirconium 500-1000 ppm 500-1500 ppm
Le complément étant du fer plus les impuretés caractéristiques de la pratique de la fabrication du métal.
Cet acier est élaboré par fusion électrique suivie d'un affinage en poche chauffante, d'un dégazage sous vide et d'une refusion sous laitier.
Dans cet acier, le Carbone et le Niobium forment du carbure de Niobium et le Titane ou le Zirconium favorisent l'obtention du carbure de Niobium idiomorphe.
La relation stoechiométrique pour la formation du carbure de Niobium est de l'ordre de 1% de Niobium pour 0,12% de Carbone. Le Carbone en excès est équilibré par la teneur de l'acier en Chrome en Molybdène et en Vanadium.
L'acier selon l'invention a une dureté supérieure à 60 Hrc. Il présente une combinaison de qualités; résistance à l'usure abrasive, usinabilité, ténacité qui ne pouvait être obtenue jusqu'à présent.
La ténacité est déterminée par une mesure suivant l'essai Charpy. Une éprouvette de référence 7x10x55mm est traitée à 1050° C, arrêt à l'huile , suivi d'un revenu de deux heures à 560° C; elle présente pour une dureté supérieure ou égale à 60 Hrc, une énergie de rupture supérieure ou égale à 40 Joules.
L'acier de formage à froid objet de l'invention présente une amélioration de la résistance à l'usure qui couvre trois formes :
  • l'usure abrasive, nettement améliorée
  • l'usure par écaillage, nettement améliorée, grâce à l'excellente ténacité de l'acier
  • l'usure par adhérence nettement améliorée.
La présente invention ne doit pas être considérée comme lim itée au mode de réalisation décrit et représenté, mais en couvre, au contraire, toutes les variantes.

Claims (2)

  1. Acier pour le formage à froid obtenu par fusion et affinage d'un alliage caractérisé en ce que l'alliage a la composition pondérale suivante : Carbone 0,80 - 1,50 % Manganèse < 1 % Silicium < 1 % Phosphore ≤ 0,030 % Soufre ≤ 0,005 % Chrome 6,25 - 9 % Nickel < 0,50 % Molybdène 1,80 - 3 % Aluminium ≤ 0,15% Vanadium 0,20 - 0,40 % Niobium 0,60 - 1,50 % Azote < 150ppm Oxygène < 50ppm Titane ou 500 - 1500ppm Zirconium
    Le complément étant du fer plus les impuretés caractéristiques de la pratique de la fabrication du métal.
  2. Acier selon la revendication 1,
    caractérisé en ce que l'alliage a la composition pondérale suivante : Carbone 1 - 1,20 % Manganèse 0,30 - 0,50 % Silicium 0,80 - 1 % Phosphore ≤ 0,020 % Soufre ≤ 0,005 % Chrome 8 - 8,50 % Nickel < 0,30 % Molybdène 2 - 2,30 % Aluminium < 200ppm Vanadium 0,20 - 0,40 % Niobium 0,60 - 0,90 % Azote < 130 ppm Oxygène < 30 ppm Titane ou Zirconium 500-1000 ppm
    Le complément étant du fer plus les impuretés caractéristiques de la pratique de la fabrication du métal.
EP98400178A 1997-02-04 1998-01-29 Acier pour le formage à froid Expired - Lifetime EP0856591B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9701459A FR2759092B1 (fr) 1997-02-04 1997-02-04 Acier pour le formage a froid
FR9701459 1997-02-04

Publications (2)

Publication Number Publication Date
EP0856591A1 EP0856591A1 (fr) 1998-08-05
EP0856591B1 true EP0856591B1 (fr) 2001-08-01

Family

ID=9503484

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98400178A Expired - Lifetime EP0856591B1 (fr) 1997-02-04 1998-01-29 Acier pour le formage à froid

Country Status (18)

Country Link
EP (1) EP0856591B1 (fr)
KR (1) KR100487086B1 (fr)
CN (1) CN1087038C (fr)
AR (1) AR011620A1 (fr)
AT (1) ATE203784T1 (fr)
AU (1) AU733190B2 (fr)
BR (1) BR9800544A (fr)
CA (1) CA2226350C (fr)
CO (1) CO4930308A1 (fr)
DE (1) DE69801241T2 (fr)
ES (1) ES2161506T3 (fr)
FR (1) FR2759092B1 (fr)
HK (1) HK1016657A1 (fr)
MY (1) MY117322A (fr)
PT (1) PT856591E (fr)
SG (1) SG60192A1 (fr)
SI (1) SI9800030A (fr)
ZA (1) ZA98725B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104532165B (zh) * 2014-12-19 2016-12-28 泰州市宏华冶金机械有限公司 一种改良型冷轧辊
CN107937839A (zh) * 2017-11-22 2018-04-20 安徽恒利增材制造科技有限公司 一种高硬度耐磨合金钢

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3926232A1 (de) * 1988-09-22 1990-03-29 Kloeckner Humboldt Deutz Ag Verschleissfeste walzenbeschichtung fuer die walzen von walzenpressen und verfahren zum aufbauen der walzenbeschichtung
CA2059293A1 (fr) * 1989-06-30 1990-12-31 Peter Robert Saxby Composition d'acier pour rouleau composite et traitement thermique de celui-ci
AT393387B (de) * 1989-10-23 1991-10-10 Boehler Gmbh Kaltarbeitsstahl mit hoher druckfestigkeit und verwendung dieses stahles
FR2733096B1 (fr) * 1995-04-14 1997-07-04 Crouzet Appliance Controls Procede de regulation de vitesse d'un moteur electrique

Also Published As

Publication number Publication date
CN1087038C (zh) 2002-07-03
PT856591E (pt) 2001-12-28
DE69801241T2 (de) 2002-05-08
FR2759092A1 (fr) 1998-08-07
ES2161506T3 (es) 2001-12-01
KR19980071037A (ko) 1998-10-26
SI9800030A (sl) 1998-10-31
CN1200411A (zh) 1998-12-02
AR011620A1 (es) 2000-08-30
CA2226350A1 (fr) 1998-08-04
HK1016657A1 (en) 1999-11-05
KR100487086B1 (ko) 2005-07-21
ATE203784T1 (de) 2001-08-15
ZA98725B (en) 1998-08-05
AU733190B2 (en) 2001-05-10
DE69801241D1 (de) 2001-09-06
CA2226350C (fr) 2002-09-10
CO4930308A1 (es) 2000-06-27
FR2759092B1 (fr) 1999-04-16
MY117322A (en) 2004-06-30
BR9800544A (pt) 1999-09-28
EP0856591A1 (fr) 1998-08-05
SG60192A1 (en) 1999-02-22
AU5289398A (en) 1998-08-06

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