WO1999053112A1 - Improvements to steel for forming tools - Google Patents

Improvements to steel for forming tools Download PDF

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Publication number
WO1999053112A1
WO1999053112A1 PCT/FR1998/000725 FR9800725W WO9953112A1 WO 1999053112 A1 WO1999053112 A1 WO 1999053112A1 FR 9800725 W FR9800725 W FR 9800725W WO 9953112 A1 WO9953112 A1 WO 9953112A1
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WO
WIPO (PCT)
Prior art keywords
steel
niobium
carbon
vanadium
tungsten
Prior art date
Application number
PCT/FR1998/000725
Other languages
French (fr)
Inventor
Jacques Adrien
Bertrand Remi
Original Assignee
Thyssen France S.A.
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
Priority to FR9612339A priority Critical patent/FR2754275B1/en
Application filed by Thyssen France S.A. filed Critical Thyssen France S.A.
Priority to EP98920603A priority patent/EP0990055B1/en
Priority to BRPI9815563-6A priority patent/BR9815563A/en
Priority to AT98920603T priority patent/ATE221928T1/en
Priority to DE69807080T priority patent/DE69807080T2/en
Priority to ES98920603T priority patent/ES2181215T3/en
Priority to PCT/FR1998/000725 priority patent/WO1999053112A1/en
Publication of WO1999053112A1 publication Critical patent/WO1999053112A1/en

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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
    • C22C38/30—Ferrous alloys, e.g. steel alloys containing chromium with cobalt
    • 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%
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/24—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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum

Definitions

  • the present invention relates to a steel obtained by powder metallurgy.
  • This steel obtained from an agglomerated pre-alloyed powder, is characterized in that the alloy has the following weight composition:
  • said steel has a dispersion of Niobium carbides and chromium carbides (Fe-Cr) ⁇ C in preference to (Cr ⁇ -c ⁇ ) obtained by a chromium content of between 6.05 and 6.45%, giving it improved resistance to abrasive wear without affecting the other properties or even improving them.
  • the present invention proposes to provide a semi-hot or even cold forming steel, produced starting from powder metallurgy.
  • the techniques used in mid-hot shaping are generally those of cold shaping but the blanks are preheated to a temperature between 900 ° and room temperature.
  • the main obstacles to the development of mid-hot forming are
  • the tool-part contact time is between 0.5 & 2 seconds. It is mainly on the improvement of the behavior of the material with respect to thermal and mechanical stresses, thermal and mechanical shocks, the increase in abrasion resistance that the shaping steel, object of the 3 present invention, proposes to respond by having a high hardness when cold associated with high characteristics when hot.
  • the new semi-rapid steel produced from powder metallurgy has a dispersion of niobium carbides and chromium carbides (Fe-Cr) 4C in preference to Cr ⁇ C- ⁇ generated by a chromium content of between 6, 05 and 6.45% by weight giving it improved resistance to abrasive wear without reducing the characteristics of the other properties, in particular the toughness.
  • the steel of the present invention complements the ATSI H.11 type steels. H.12 H.13 and M50-M2 etc.
  • niobium carbide 1% niobium for 0.12% carbon.
  • the carbon content of the steel is balanced with its vanadium, niobium, chromium, molybdenum contents to supply sufficient carbon and thus allow the object obtained by powder metallurgy to be heat treated so as to obtain a hardness ⁇ 64 Hrc.
  • the steel for shaping tools according to the invention has a combination of qualities: resistance to abrasive wear, 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 defined in standard ASTM 23-92 and 23-93. A 10x10x55mm reference test piece is treated at 1050 ° C, oil stop or isothermal stop at 560 ° C followed three hour returns at 560 °; it then has a toughness greater than 100J / cm2.
  • the cutting capacity is characterized by the Mathon test (defined in standard AFMOR A.03.654).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

The invention concerns steel obtained by powder metallurgy, formed from a sintered and densified high purity pre-alloyed powder. The invention is characterised in that the steel weight composition is as follows: manganese < 1 %; silicon < 1 %; chromium 6.05-6.45 %; molybdenum 2.50-3.50 %; vanadium 0.80-2 %; tungsten < 0.5 %; sulphur < 0.020 %; phosphorus < 0.030 %; niobium 0.60-1.60 %; cobalt 2 to 5 %; nitrogen 0.050 to 0.080 %; aluminium < 0.060 %; carbon 0.75-0.95 %; nickel < 0.50 %; the rest being iron and the standard impurities involved in steel manufacture.

Description

Perfectionnements apportés aux aciers pour outils de mise en formeImprovements to steels for shaping tools
La présente invention a pour objet un acier obtenu par la métallurgie des poudres.The present invention relates to a steel obtained by powder metallurgy.
Cet acier, obtenu à partir d'une poudre pré-alliée agglomérée est caractérisé en ce que l'alliage a la composition pondérale suivante :This steel, obtained from an agglomerated pre-alloyed powder, is characterized in that the alloy has the following weight composition:
Fourchette préférée Fourchette largePreferred range Wide range
Manganèse 0,20-0,40 % < 1%Manganese 0.20-0.40% <1%
Silicium 0,20-0,40 % 1%Silicon 0.20-0.40% 1%
Chrome 6,05-6,45 % 6,05-6,45% Molybdène 2,75-3,25 % 2,50-3,50% Vanadium 0,90-1,30 % 0,80-2% Tungstène 0,50 % 0,50% Soufre 0,020 % < 0,020% Phosphore < 0,030 % *-. 0,030% Niobium 0,70-1,10 % 0,60-1,60% Cobalt 2,60-3,40 % 2 à 5% Azote 0,050-0,080 % 0,050-0,080% Aluminium < 0,060 % -£0,060% Carbone 0,78-0,85 % 0,75-0,95% Nickel <0,30 % έ. 0,50% 2Chromium 6.05-6.45% 6.05-6.45% Molybdenum 2.75-3.25% 2.50-3.50% Vanadium 0.90-1.30% 0.80-2% Tungsten 0.50% 0.50% Sulfur 0.020% <0.020% Phosphorus <0.030% * -. 0.030% Niobium 0.70-1.10% 0.60-1.60% Cobalt 2.60-3.40% 2 to 5% Nitrogen 0.050-0.080% 0.050-0.080% Aluminum <0.060% - £ 0.060% Carbon 0.78-0.85% 0.75-0.95% Nickel <0.30% έ. 0.50% 2
Le complément étant du fer plus les impuretés caractéristiques de la pratique de la fabrication du métal, ledit acier présente une dispersion de carbures de Niobium et de carbures de chrome (Fe-Cr)^ C de préférence au (Cr^-c^) obtenu par une teneur en chrome comprise entre 6,05 et 6,45%, lui conférant une résistance à l'usure abrasive améliorée sans toucher aux autres propriétés voire en les améliorant.The complement being iron plus the impurities characteristic of the practice of metal fabrication, said steel has a dispersion of Niobium carbides and chromium carbides (Fe-Cr) ^ C in preference to (Cr ^ -c ^) obtained by a chromium content of between 6.05 and 6.45%, giving it improved resistance to abrasive wear without affecting the other properties or even improving them.
La présente invention se propose de fournir un acier de formage à mi-chaud, voire à froid, élaboré en partant de la métallurgie des poudres. Les techniques mises en oeuvre dans la mise en forme à mi-chaud sont en général celles de la mise en forme à froid mais les ébauches sont préchauffées à une température comprise entre 900° et la température ambiante. Les principaux obstacles au développement du formage à mi-chaud sontThe present invention proposes to provide a semi-hot or even cold forming steel, produced starting from powder metallurgy. The techniques used in mid-hot shaping are generally those of cold shaping but the blanks are preheated to a temperature between 900 ° and room temperature. The main obstacles to the development of mid-hot forming are
assurer la lubrication de l'opération de formage la tenue des outillages, en grande partie due au matériau de constitution de ceux-ci.ensuring the lubrication of the forming operation the holding of the tools, largely due to the material of which they are made.
L'expérience a prouvé que les meilleurs résultats étaient obtenus avec une température de la matrice de 400 °C environ avant forgeage, après l'opération de formage la température de la matrice est portée superficiellement vers 650 °C. Entre deux opérations de formage la température est ramenée vers 400 °C par un soufflage à l'air comprimé associé à une pulvérisation du lubrifiant.Experience has shown that the best results are obtained with a matrix temperature of approximately 400 ° C before forging, after the forming operation the temperature of the matrix is brought up to 650 ° C. Between two forming operations, the temperature is brought back to around 400 ° C. by blowing with compressed air associated with spraying the lubricant.
Le temps de contact outillage-pièce est compris entre 0,5 & 2 secondes. C'est principalement sur l'amélioration du comportement du matériau vis à vis des contraintes thermiques et mécaniques, des chocs thermiques et mécaniques, de l'augmentation de la résistance à l'abrasion que l'acier de mise en forme, objet de la 3 présente invention, se propose de répondre en présentant une dureté élevée à froid associée à des caractéristiques élevées à chaud.The tool-part contact time is between 0.5 & 2 seconds. It is mainly on the improvement of the behavior of the material with respect to thermal and mechanical stresses, thermal and mechanical shocks, the increase in abrasion resistance that the shaping steel, object of the 3 present invention, proposes to respond by having a high hardness when cold associated with high characteristics when hot.
Le nouvel acier semi-rapide élaboré en partant de la métallurgie des poudres présente une dispersion de carbures de niobium et de carbures de chrome (Fe-Cr)4C de préférence au Cr^C-^ générés par une teneur en chrome comprise entre 6,05 et 6,45% pondérale lui conférant une résistance à l'usure abrasive améliorée sans réduire les caractéristiques des autres propriétés, en particulier la ténacité.The new semi-rapid steel produced from powder metallurgy has a dispersion of niobium carbides and chromium carbides (Fe-Cr) 4C in preference to Cr ^ C- ^ generated by a chromium content of between 6, 05 and 6.45% by weight giving it improved resistance to abrasive wear without reducing the characteristics of the other properties, in particular the toughness.
Cette action est dynamisée si l'acier contient peu ou pas de tungstène, ceci vaut également pour la teneur en cobalt maintenue entre 2,60 et 3,40%, l'acier de la présente invention complète les aciers de type ATSI H.11 H.12 H.13 et M50-M2 etc.This action is energized if the steel contains little or no tungsten, this also applies to the cobalt content maintained between 2.60 and 3.40%, the steel of the present invention complements the ATSI H.11 type steels. H.12 H.13 and M50-M2 etc.
La relation stoechiométrique pour la formation du carbure de niobium est de 1% de niobium pour 0,12% de carbone. La teneur en carbone de l'acier est équilibrée avec ses teneurs en vanadium, niobium, chrome, molybdène pour fournir suffisamment de carbone et permettre ainsi à l'objet obtenu par la métallurgie des poudres d'être traité thermiquement de façon à obtenir une dureté^64 Hrc.The stoichiometric relationship for the formation of niobium carbide is 1% niobium for 0.12% carbon. The carbon content of the steel is balanced with its vanadium, niobium, chromium, molybdenum contents to supply sufficient carbon and thus allow the object obtained by powder metallurgy to be heat treated so as to obtain a hardness ^ 64 Hrc.
L'acier , pour outils de mise en forme, selon l'invention, présente une combinaison de qualités : résistance à l'usure abrasive, dureté à chaud caractérisée par' l'essai de capacité de coupe Mathon, ténacité qui ne pouvait être obtenue jusqu'à présent.The steel for shaping tools according to the invention has a combination of qualities: resistance to abrasive wear, hot hardness characterized by the Mathon cutting capacity test, toughness which could not be obtained. until now.
La ténacité est déterminée par une mesure suivant l'essai Charpy défini dans la norme ASTM 23-92 et 23- 93. Une éprouvette de référence 10x10x55mm est traitée à 1050°C, arrêt à l'huile ou arrêt isotherme à 560°C suivi de trois revenus de une heure à 560°; elle présente alors une ténacité supérieure à 100J/cm2.. La capacité de coupe est caractérisée par l'essai Mathon (défini dans la norme AFMOR A.03.654). The toughness is determined by a measurement according to the Charpy test defined in standard ASTM 23-92 and 23-93. A 10x10x55mm reference test piece is treated at 1050 ° C, oil stop or isothermal stop at 560 ° C followed three hour returns at 560 °; it then has a toughness greater than 100J / cm2. The cutting capacity is characterized by the Mathon test (defined in standard AFMOR A.03.654).

Claims

Revendications. Claims.
1. Acier obtenu par la métallurgie des poudres, formé à partir d'une poudre pré-alliée de haute pureté, agglomérée, densifiée, caractérisé en ce que l'acier a la composition pondérale suivante :1. Steel obtained by powder metallurgy, formed from a pre-alloyed powder of high purity, agglomerated, densified, characterized in that the steel has the following composition by weight:
Manganèse 4 1%Manganese 4 1%
Silicium . 1%Silicon. 1%
Chrome 6,05 - 6,45 %Chrome 6.05 - 6.45%
Molybdène 2,50 - 3,50 %Molybdenum 2.50 - 3.50%
Vanadium 0,80 - 2 %Vanadium 0.80 - 2%
Tungstène έ 0,5 %Tungsten έ 0.5%
Soufre <. 0,020 %Sulfur <. 0.020%
Phosphore 0,030 %Phosphorus 0.030%
Niobium 0,60 - 1,60 %Niobium 0.60 - 1.60%
Cobalt 2 à 5 %Cobalt 2 to 5%
Azote 0,050 à 0,080 %Nitrogen 0.050 to 0.080%
Aluminium 0,060 %Aluminum 0.060%
Carbone 0,75 - 0,95 %
Figure imgf000006_0001
Nickel < 0,50 %Carbon 0.75 - 0.95%
Figure imgf000006_0001
Nickel <0.50%
Le complément étant du fer, plus les impuretés caractéristiques de la pratique de la fabrication du métal.The complement being iron, plus the impurities characteristic of the practice of metal fabrication.
2. Acier selon la revendication 1, caractérisé en ce que l'alliage a la composition générale suivante :2. Steel according to claim 1, characterized in that the alloy has the following general composition:
Manganèse 0,20 - 0,40 %Manganese 0.20 - 0.40%
Silicium 0,20 - 0,40 %Silicon 0.20 - 0.40%
Chrome 6,05 - 6,45 % - Molybdène 2,75 - 3,25 %Chrome 6.05 - 6.45% - Molybdenum 2.75 - 3.25%
- Vanadium 0,90 - 1,30 %- Vanadium 0.90 - 1.30%
- Tungstène 0,50 %- Tungsten 0.50%
- Soufre . 0,020 %- Sulfur. 0.020%
- Phosphore Δ. 0,030 %- Phosphorus Δ. 0.030%
- Niobium 0,70 - 1,10 %- Niobium 0.70 - 1.10%
- Cobalt 2,60 - 3,40 %- Cobalt 2.60 - 3.40%
- Azote 0,050 - 0,080 %- Nitrogen 0.050 - 0.080%
- Aluminium < 0,060 %- Aluminum <0.060%
- Carbone 0,78 - 0,85 %
Figure imgf000007_0001
- Nickel < 0,30 % - Carbon 0.78 - 0.85%
Figure imgf000007_0001
- Nickel <0.30%
PCT/FR1998/000725 1996-10-04 1998-04-09 Improvements to steel for forming tools WO1999053112A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
FR9612339A FR2754275B1 (en) 1996-10-04 1996-10-04 IMPROVEMENTS TO STEELS FOR SHAPING TOOLS
EP98920603A EP0990055B1 (en) 1996-10-04 1998-04-09 Improvements to steel for forming tools
BRPI9815563-6A BR9815563A (en) 1996-10-04 1998-04-09 steel improvements for profiling tools
AT98920603T ATE221928T1 (en) 1996-10-04 1998-04-09 IMPROVED STEELS FOR SHAPING TOOLS
DE69807080T DE69807080T2 (en) 1996-10-04 1998-04-09 IMPROVED STEELS FOR MOLDING TOOLS
ES98920603T ES2181215T3 (en) 1996-10-04 1998-04-09 PERFECTION OF STEELS CONTRIBUTED TO MOLDING TOOLS.
PCT/FR1998/000725 WO1999053112A1 (en) 1996-10-04 1998-04-09 Improvements to steel for forming tools

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9612339A FR2754275B1 (en) 1996-10-04 1996-10-04 IMPROVEMENTS TO STEELS FOR SHAPING TOOLS
PCT/FR1998/000725 WO1999053112A1 (en) 1996-10-04 1998-04-09 Improvements to steel for forming tools

Publications (1)

Publication Number Publication Date
WO1999053112A1 true WO1999053112A1 (en) 1999-10-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR1998/000725 WO1999053112A1 (en) 1996-10-04 1998-04-09 Improvements to steel for forming tools

Country Status (7)

Country Link
EP (1) EP0990055B1 (en)
AT (1) ATE221928T1 (en)
BR (1) BR9815563A (en)
DE (1) DE69807080T2 (en)
ES (1) ES2181215T3 (en)
FR (1) FR2754275B1 (en)
WO (1) WO1999053112A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2203887A1 (en) * 1972-10-24 1974-05-17 Crucible Inc
FR2360683A1 (en) * 1976-08-03 1978-03-03 Acos Villares Sa COMPOSITIONS OF HARD STEELS AND PROCESS FOR THEIR MANUFACTURING
EP0275475A1 (en) * 1986-12-30 1988-07-27 Uddeholm Tooling Aktiebolag Tool steel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2203887A1 (en) * 1972-10-24 1974-05-17 Crucible Inc
FR2360683A1 (en) * 1976-08-03 1978-03-03 Acos Villares Sa COMPOSITIONS OF HARD STEELS AND PROCESS FOR THEIR MANUFACTURING
EP0275475A1 (en) * 1986-12-30 1988-07-27 Uddeholm Tooling Aktiebolag Tool steel

Also Published As

Publication number Publication date
FR2754275B1 (en) 1998-12-24
ATE221928T1 (en) 2002-08-15
BR9815563A (en) 2006-02-14
DE69807080T2 (en) 2003-02-06
FR2754275A1 (en) 1998-04-10
EP0990055A1 (en) 2000-04-05
DE69807080D1 (en) 2002-09-12
EP0990055B1 (en) 2002-08-07
ES2181215T3 (en) 2003-02-16

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