EP0885313B1 - High-speed steel - Google Patents

High-speed steel Download PDF

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Publication number
EP0885313B1
EP0885313B1 EP97934581A EP97934581A EP0885313B1 EP 0885313 B1 EP0885313 B1 EP 0885313B1 EP 97934581 A EP97934581 A EP 97934581A EP 97934581 A EP97934581 A EP 97934581A EP 0885313 B1 EP0885313 B1 EP 0885313B1
Authority
EP
European Patent Office
Prior art keywords
steel
molybdenum
vanadium
carbon
chromium
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
EP97934581A
Other languages
German (de)
French (fr)
Other versions
EP0885313A1 (en
Inventor
Jacques Adrien
Bertrand Remi
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
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Thyssen France SA
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Filing date
Publication date
Application filed by Thyssen France SA filed Critical Thyssen France SA
Publication of EP0885313A1 publication Critical patent/EP0885313A1/en
Application granted granted Critical
Publication of EP0885313B1 publication Critical patent/EP0885313B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C22C33/0285—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with Cr, Co, or Ni having a minimum content higher than 5%

Definitions

  • the object of the present invention is to produce a steel quick cut from metallurgy powders, extremely hard, which has a hardness Rockwell at scale "C" between 68 and 70 Rc.
  • This steel obtained from a pre-alloyed, agglomerated powder, is characterized in that the alloy has the following composition: Weight percentages Preferred range Wide fork Manganese 0.20-0.40 ⁇ 1% Silicon 0.20-0.40 ⁇ 1% Chromium 4.50-5 4.50-6.45% Molybdenum 4.50-5 4-6% Vanadium 6.10 - 6.50 6.10 - 6.50 Tungsten 18.20 - 18.70 18.20 - 18.70 Sulfur ⁇ 0.015% ⁇ 0.20% Phosphorus ⁇ 0.020% ⁇ 0.030% Oxygen ⁇ 100ppm ⁇ 100ppm Cobalt 5.40 - 6.20% 5 - 7% Nitrogen 0.050 - 0.080% 0.050 - 0.080% Aluminum ⁇ 0.015% ⁇ 0.020% Carbon 1.83 - 1.90% 1.80 - 1.95%
  • the remainder being iron plus the impurities characteristic of the practice of metal fabrication, said steel having a dispersion essentially composed of carbides of the MC vanadium type.
  • the steel according to the present invention exhibits remarkable toughness, due in large part to a remarkable distribution of primary carbides, associated with very good hot hardness.
  • exceptional toughness the family of steels of the present invention offers a particular aptitude for shaping tools: machinability, hardenability , moldability.
  • Document US-5403372 describes an alloy which has a similar composition but whose carbon content is between 2 and 2.5%. In contrast, in the alloy according to the invention, the carbon content is limited to 1.95%.
  • the stoichiometric relationship for the formation of vanadium carbide is 1% of vanadium for 0.20% of carbon.
  • the carbon content of the steel is balanced with its vanadium, chromium, molybdenum and tungsten contents to provide sufficient carbon and thus allow it to be heat treated so as to obtain a hardness of 66 Hrc.
  • the steel for shaping tools according to the invention has a combination of qualities: wear resistance, hot hardness, characterized by the Mathon cutting capacity test, toughness which could not be obtained until now.
  • the toughness is determined by a measurement according to the Charpy test designated in standard ASTM-23-92 and 23-93.
  • a 10x10x55mm reference test piece is treated at 1.160 ° C, oil shutdown or isothermal shutdown at 560 ° C followed by three one-hour tempers at 560 ° C; it then has a toughness greater than 40 J / cm 2 .
  • the cutting capacity is characterized by the MATHON test (defined in standard AFNOR A.03.654).

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Description

Comme les industries de l'aviation, de l'armement et les industries associées usinent des matériaux ayant une résistance mécanique toujours plus grande, il est évident qu'on a besoin d'un acier à coupe rapide très dur qui, par la métallurgie des poudres, possède une ténacité élevée en offrant une résistance des arêtes de coupe positive de très haut niveau.Like the aviation, arms and associated industries machine materials having ever greater mechanical resistance, it is obvious that we need very fast cutting steel hard which, by powder metallurgy, has a high toughness by offering edge resistance very high level positive cut.

La présente invention a pour but de réaliser un acier à coupe rapide élaboré en partant de la métallurgie des poudres, extrêment dur, qui présente une dureté Rockwell à l'échelle "C" entre 68 et 70 Rc.The object of the present invention is to produce a steel quick cut from metallurgy powders, extremely hard, which has a hardness Rockwell at scale "C" between 68 and 70 Rc.

Cet acier, obtenu à partir d'une poudre pré-alliée, agglomérée, est caractérisé en ce que l'alliage a la composition suivante : Pourcentages en valeur pondérale Fourchette préférée Fourchette large Manganèse 0,20-0,40 < 1% Silicium 0,20-0,40 < 1% Chrome 4,50-5 4,50-6,45% Molybdène 4,50-5 4-6% Vanadium 6,10 - 6,50 6,10 - 6,50 Tungstène 18,20 - 18,70 18,20 - 18,70 Soufre ≤ 0,015% ≤ 0,20% Phosphore ≤ 0,020% ≤ 0,030% Oxygène ≤ 100ppm ≤ 100ppm Cobalt 5,40 - 6,20% 5 - 7 % Azote 0,050 - 0,080% 0,050 - 0,080% Aluminium < 0,015% ≤ 0,020% Carbone 1,83 - 1,90% 1,80 - 1,95% This steel, obtained from a pre-alloyed, agglomerated powder, is characterized in that the alloy has the following composition: Weight percentages Preferred range Wide fork Manganese 0.20-0.40 <1% Silicon 0.20-0.40 <1% Chromium 4.50-5 4.50-6.45% Molybdenum 4.50-5 4-6% Vanadium 6.10 - 6.50 6.10 - 6.50 Tungsten 18.20 - 18.70 18.20 - 18.70 Sulfur ≤ 0.015% ≤ 0.20% Phosphorus ≤ 0.020% ≤ 0.030% Oxygen ≤ 100ppm ≤ 100ppm Cobalt 5.40 - 6.20% 5 - 7% Nitrogen 0.050 - 0.080% 0.050 - 0.080% Aluminum <0.015% ≤ 0.020% Carbon 1.83 - 1.90% 1.80 - 1.95%

Le complément étant du fer plus les impuretés caractéristiques de la pratique de la fabrication du métal, ledit acier ayant une dispersion essentiellement composée de carbures du type MC de vanadium. L'acier selon la présente invention présente une ténacité remarquable, due en grande partie à une répartition de carbures primaires remarquable, associée à une très bonne dureté à chaud. En plus de la dureté, de la dureté à chaud, de la résistance à l'usure, d'une ténacité exceptionnelle la famille d'aciers de la présente invention offre une aptitude particulière à la mise en forme d'outils : usinabilité, trempabilité, moulabilité.
Le document US - 5403372 décrit un alliage qui a une composition voisine mais dont la teneur en carbone est comprise entre 2 et 2,5% . Au contraire dans l'alliage selon l'invention, la teneur en carbone est limitée à 1,95%.The remainder being iron plus the impurities characteristic of the practice of metal fabrication, said steel having a dispersion essentially composed of carbides of the MC vanadium type. The steel according to the present invention exhibits remarkable toughness, due in large part to a remarkable distribution of primary carbides, associated with very good hot hardness. In addition to hardness, hot hardness, resistance to wear, exceptional toughness the family of steels of the present invention offers a particular aptitude for shaping tools: machinability, hardenability , moldability.
Document US-5403372 describes an alloy which has a similar composition but whose carbon content is between 2 and 2.5%. In contrast, in the alloy according to the invention, the carbon content is limited to 1.95%.

La relation stoechiométrique pour la formation du carbure de vanadium (type MC cubique à face centrée) est de 1% de vanadium pour 0, 20% de carbone. La teneur en carbone de l'acier est équilibrée avec ses teneurs en vanadium, en chrome, en molybdène et en tungstène pour fournir suffisamment de carbone et permettre ainsi d'être traitée thermiquement de façon à obtenir une dureté de 66 Hrc.
L'acier, pour outils de mise en forme, selon l'invention présente une combinaison de qualités : résistance à l'usure, dureté à chaud, caractérisée par l'essai de capacité de coupe Mathon, ténacité qui ne pouvait être obtenue jusqu'à présent.
La ténacité est déterminée par une mesure suivant l'essai Charpy désigné dans la norme ASTM-23-92 et 23-93. Une éprouvette de référence 10x10x55mm est traitée à 1.160° C, arrêt à l'huile ou arrêt isotherme à 560° C suivi de trois revenus de une heure à 560°C; elle présente alors une ténacité supérieure à 40 J/cm2. La capacité de coupe est caractérisée par l'essai MATHON (défini dans la norme AFNOR A.03.654).The stoichiometric relationship for the formation of vanadium carbide (face-centered cubic MC type) is 1% of vanadium for 0.20% of carbon. The carbon content of the steel is balanced with its vanadium, chromium, molybdenum and tungsten contents to provide sufficient carbon and thus allow it to be heat treated so as to obtain a hardness of 66 Hrc.
The steel for shaping tools according to the invention has a combination of qualities: wear resistance, hot hardness, characterized by the Mathon cutting capacity test, toughness which could not be obtained until now.
The toughness is determined by a measurement according to the Charpy test designated in standard ASTM-23-92 and 23-93. A 10x10x55mm reference test piece is treated at 1.160 ° C, oil shutdown or isothermal shutdown at 560 ° C followed by three one-hour tempers at 560 ° C; it then has a toughness greater than 40 J / cm 2 . The cutting capacity is characterized by the MATHON test (defined in standard AFNOR A.03.654).

Claims (2)

  1. Steel produced via the metallurgy of powders, formed from a high-purity agglomerated densified pre-alloyed powder,
    characterised in that the steel has the following weighted composition: Manganese < 1 % Silicon < 1 % Chromium 4,50 - 6,45 % Molybdenum 4 - 6 % Vanadium 6,10 - 6,50 % Tungsten 18,20 - 18,70 % Sulphur ≤ 0,020 % Phosphorus ≤ 0,030 % Oxygen ≤ 100 ppm Cobalt 5 - 7 % Nitrogen 0,050-0,080 % Aluminium < 0,020 % Carbon 1,80 - 1,95 %
    As the complement is iron plus impurities characteristic of the practice of producing steel, said steel having a dispersion mainly composed of molybdenum Fe2 Laves phase.
  2. Steel according to claim 1,
    Characterised in that the alloy has the general following composition: Manganese 0,20-0,40 % Silicon 0,20-0,40 % Chromium 4,50 - 5 % Molybdenum 4,50 - 5 % Vanadium 6,10 - 6,50 % Tungsten 18,20 - 18, 70 % Sulphur ≤ 0,015 % Phosphorus ≤ 0,020 % Oxygen ≤ 100 ppm Cobalt 5,40 - 6,20 % Nitrogen 0,050 - 0,080 % Aluminium < 0,015 % Carbon 1,83 - 1,90 %
EP97934581A 1996-07-19 1997-07-17 High-speed steel Expired - Lifetime EP0885313B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9609080A FR2751348B1 (en) 1996-07-19 1996-07-19 STEEL FOR SHAPING TOOLS
FR9609080 1996-07-19
PCT/FR1997/001328 WO1998003692A1 (en) 1996-07-19 1997-07-17 High-speed steel

Publications (2)

Publication Number Publication Date
EP0885313A1 EP0885313A1 (en) 1998-12-23
EP0885313B1 true EP0885313B1 (en) 2001-10-24

Family

ID=9494244

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97934581A Expired - Lifetime EP0885313B1 (en) 1996-07-19 1997-07-17 High-speed steel

Country Status (13)

Country Link
US (1) US5969277A (en)
EP (1) EP0885313B1 (en)
KR (1) KR20000064245A (en)
AR (1) AR007934A1 (en)
AT (1) ATE207549T1 (en)
AU (1) AU727767B2 (en)
BR (1) BR9706600A (en)
CA (1) CA2230718A1 (en)
DE (1) DE69707651T2 (en)
ES (1) ES2166096T3 (en)
FR (1) FR2751348B1 (en)
PL (1) PL325556A1 (en)
WO (1) WO1998003692A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE240420T1 (en) 1999-01-29 2003-05-15 Crs Holdings Inc HIGH-STRENGTH POWDER METALLURGICAL TOOL STEEL AND ITEMS MADE THEREFROM

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB781083A (en) * 1954-10-01 1957-08-14 Gregory Jamieson Comstock Improvements relating to high speed tool forms and their production
US3150444A (en) * 1962-04-26 1964-09-29 Allegheny Ludlum Steel Method of producing alloy steel
US4080205A (en) * 1972-07-13 1978-03-21 Toyota Jidosha Kogyo Kabushiki Kaisha Sintered alloy having wear-resistance at high temperature
JP2725333B2 (en) * 1988-12-27 1998-03-11 大同特殊鋼株式会社 Powder high speed tool steel
US5403372A (en) * 1991-06-28 1995-04-04 Hitachi Metals, Ltd. Vane material, vane, and method of producing vane
SE500008C2 (en) * 1991-08-07 1994-03-21 Erasteel Kloster Ab High speed steel with good hot hardness and durability made of powder

Also Published As

Publication number Publication date
BR9706600A (en) 1999-07-20
WO1998003692A1 (en) 1998-01-29
FR2751348B1 (en) 1998-10-02
KR20000064245A (en) 2000-11-06
AU3773797A (en) 1998-02-10
FR2751348A1 (en) 1998-01-23
AR007934A1 (en) 1999-11-24
US5969277A (en) 1999-10-19
DE69707651T2 (en) 2002-07-11
DE69707651D1 (en) 2001-11-29
ES2166096T3 (en) 2002-04-01
ATE207549T1 (en) 2001-11-15
AU727767B2 (en) 2000-12-21
EP0885313A1 (en) 1998-12-23
CA2230718A1 (en) 1998-01-29
PL325556A1 (en) 1998-08-03

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