EP0348380B2 - Utilisation d'un alliage à base de fer pour la fabrication de pièces frittées, présentant une haute résistance à la corrosion, une haute résistance à l'usure ainsi qu'une haute tenacité et résistance à la compression et destinées, en particulier, au travail des matières synthétiques - Google Patents

Utilisation d'un alliage à base de fer pour la fabrication de pièces frittées, présentant une haute résistance à la corrosion, une haute résistance à l'usure ainsi qu'une haute tenacité et résistance à la compression et destinées, en particulier, au travail des matières synthétiques Download PDF

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Publication number
EP0348380B2
EP0348380B2 EP89890163A EP89890163A EP0348380B2 EP 0348380 B2 EP0348380 B2 EP 0348380B2 EP 89890163 A EP89890163 A EP 89890163A EP 89890163 A EP89890163 A EP 89890163A EP 0348380 B2 EP0348380 B2 EP 0348380B2
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Prior art keywords
iron
max
content
weight
carbides
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EP89890163A
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German (de)
English (en)
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EP0348380A1 (fr
EP0348380B1 (fr
Inventor
Alfred Dr. Kulmburg
Johann Dipl.-Ing. Stamberger
Hubert Dipl.-Ing. Lenger
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Boehler Edelstahl alpha Edelstahl Gmbh boehle GmbH
Boehler GmbH Germany
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Boehler GmbH
Boehler GmbH Germany
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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 invention relates to the use of an iron-based alloy with a special composition as a material for the powder metallurgical production of parts with high corrosion resistance, high wear resistance and high toughness and pressure resistance, preferably for plastic molds, machine parts and tools for non-cutting shaping.
  • a material for the powder metallurgical production of parts with high corrosion resistance, high wear resistance and high toughness and pressure resistance preferably for plastic molds, machine parts and tools for non-cutting shaping.
  • shaping parts are exposed to chemical and abrasive stresses at the same time, whereby these parts must have high material toughness, high pressure resistance and special material homogeneity due to the mechanical stresses.
  • Such requirements are placed, for example, on materials that are used in devices for pressing fiber-reinforced or filler-containing plastics. Austenitic steels or chromium steels with a chromium content of approx.
  • alloys according to DIN material no. are used for mechanical components such as screws etc. and also for forming and pressing tools, which are particularly exposed to corrosive stresses. 1.4528. Although such materials have sufficient corrosion resistance, the wear behavior is usually unsatisfactory in practical operation. In order to improve or increase the wear resistance and the hardness of the steel, attempts have also been made to increase the carbide content of the alloy by means of higher carbon contents. These steels, for example alloys according to DIN material no. 1.2080 and material no. 1.2379, with a carbon content of approx. 2% and a chromium content of approx.
  • the object of the invention is to avoid the above disadvantages and, in particular, to create materials which can be used advantageously for the plastics processing industry and which, due to a special composition when using certain manufacturing processes, provide high corrosion resistance, high wear resistance and high pressure resistance have good toughness properties.
  • the material has a niobium content of 0.2 to 3.0 and / or a titanium content of 0.2 to 3.5 and / or a boron content of 0.001 to 0.002. It is particularly preferred if the value is formed from (% Cr - 13) + 4.4x (% V - 3) + 2x (% Nb) + 4.2x (Ti) is at least 10.0.
  • the parts which are produced from the alloy used according to the invention by a powder metallurgy manufacturing process must have a chromium concentration in all parts of the matrix of at least 13% after hardening and tempering.
  • the alloy according to the invention from a minimum value, which takes into account the concentrations and the respective effect with the mutual influence of the carbide-forming elements chromium, vanadium, niobium and titanium, and which determines the wear resistance of the material in particular, in certain cases Limits set carbon contents and when using powder metallurgical manufacturing processes, materials that have high corrosion resistance, high wear resistance, high pressure resistance and high toughness at the same time and are advantageous, especially for the construction of plastic molds, can be used, the hardened and tempered state of the Chromium content in all areas of the matrix and the proportion as well as the composition and the grain size of the carbides can be adjusted according to the invention.
  • chromium is a carbide former that can form M23C6 carbides with carbon in certain carbon activities and in the presence of molybdenum and vanadium in addition to M7C3 carbides. It is therefore important that the steel contains at least 16% by weight of chromium, but at most contains 29% by weight of chromium, because higher chromium concentrations lead to embrittlement of the material. Molybdenum in contents of 0.4 to 2.5% by weight and tungsten in Levels of 0.3 to 2.0% by weight cause an increase in secondary hardness in the heat treatment due to the formation of fine carbides and are important for adjusting the carbon activity of the alloy.
  • Aluminum can be alloyed as an element with a high affinity for oxygen and a high affinity for nitrogen in concentrations of up to 1% by weight to adjust the low oxygen content of the steel and to avoid grain growth, whereby advantageous effects on the conversion behavior and the toughness of the material can also be achieved. It was also found that a minimum value of the alloy, formed from the concentrations of the carbide- and nitride-forming elements chromium, tungsten, niobium, titanium and certain action factors of these elements is required for the setting of the desired mechanical properties of the part, by increasing this Worth an improvement in wear resistance and compressive strength with a slight decrease in toughness.
  • the carbon content is set within narrow limits depending on the contents and on certain operating parameters of the carbide-forming elements in the steel in order to obtain the desired properties of the parts.
  • Powder-metallurgical production of the parts is essential because this significantly improves their isotropic properties of the material and the grain size of the precipitates or intermetallic phases can be kept small. Carbides with grain sizes over 14 ⁇ m significantly impair the mechanical properties, in particular the bending strength of the parts.
  • the powder can be produced using all suitable processes, in particular using gas atomization processes, after which, if appropriate, compacting is carried out by hot isostatic pressing and / or by hot-working the powder in suitable casings.
  • Iron and manufacturing-related impurities as the rest an alloy powder was produced in the gas atomization process. After the powder had been poured into a capsule with a diameter of 250 mm and the capsule had been evacuated and sealed gas-tight, it was thermoformed at 1110 ° C. using a 6-fold degree of deformation. After soft annealing at 880 to 900 ° C and slow cooling, plastic molds were made from the forging rod. The hardness of the material was around 280 HB. The parts were hardened after heating to a temperature of 1140 ° C. by cooling in a warm bath, whereupon a hardness value of 61 HRC was measured. After tempering at 540 ° C the material hardness was 59 HRC.
  • the 0.2% compression limit was used to determine the compressive strength, the value being 2015 N / mm.
  • the wear behavior of the part was tested in the grinding wheel test, in which a steel disc rotates in a corundum-water mixture, against which the sample is pressed.

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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)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Laminated Bodies (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)

Claims (6)

  1. Utilisation d'un alliage à base de fer, dont la composition en % de poids est la suivante :
    Silicium   0.6 max.
    Manganèse   0.6 max.
    Soufre   0.015 max.
    Phosphore   0.02 max.
    Chrome   18.0 - 25.0
    Molybdène   0,6 - 1,7
    Tungstène   0,5 - 1,5
    Vanadium   3,5 - 5,6
    Titane   jusqu'à 5,0
    Aluminium   jusqu'à 1,0
    Nickel   0,5 max.
    Cobalt   0,5 max.
    Cuivre   0,4 max.
    Bore   jusqu'à 0,03
    Azote   0,03 jusqu'à 0,1
    Niobium   jusqu'à 5,0
    Fer et impuretés dues à la fabrication pour le reste, la valeur représentée par (%Cr - 13) + 4,4x (%V - 3) + 2x (%Nb) + 4,2x (%Ti)
    Figure imgb0013
     étant supérieure à 8,8 et la teneur en carbone de l'alliage s'élevant pour le minimum à la relation : C min = 0,3 + [(%Cr - 13) x 0,06] + [(2x %Mo + W) x 0,03] + (%V x 0,24) + (%Nb x 0,13) + (%Ti x 0,25),
    Figure imgb0014
     et pour le maximum à la relation : C max = 0,7 + [(%Cr - 13)x 0,06] + [(2x %Mo + W) x 0,03] + (%V x 0,24) + (%Nb x 0,13) + (%Ti x 0,25)
    Figure imgb0015
     cet alliage servant à la fabrication de pièces frittées présentant une haute résistance à la corrosion et une haute résistance à l'usure,ainsi qu'une haute ténacité et résistance à la compression, destinées, en particulier, à des moules pour matières synthétiques, à des pièces de machines et à des outillages pour formage, sous réserve qu'après le durcissement et le revenu, la matrice présente une teneur en chrome d'au moins 13% et que la teneur en carbure s'élève en volume au minimum à 25%, dans au moins 5% en volume de carbure-MC, la grosseur de grain du carbure étant inférieure à 14 µm.
  2. Utilisation d'un alliage à base de fer selon la revendication 1 , caractérisée en ce que la valeur représentée par (% Cr - 13) + 4,4x(%V - 3) + 2x(%Nb) + 4,2x(%Ti)
    Figure imgb0016
     est supérieure à 10,0.
  3. Utilisation d'un alliage à base de fer selon l'une des revendications 1 ou 2, présentant une teneur en niobium s'élevant, quant au % en poids, de 0,2 à 3,0.
  4. Utilisation d'un alliage à base de fer selon l'une des revendications; 1 à 3, dont la teneur en titane s'élève de 0, 2 à 3, 5,
  5. Utilisation d'un alliage à base de fer selon l'une des revendications 1 à 4, dont la teneur en bore s'élève de 0,001 à 0,002.
  6. Utilisation d'un alliage à base de fer selon les revendications 1 à 5, dont la teneur en carbone s'élève, quant au % en poids au minimum à 1,8, mais au plus, cependant,à 6,2.
EP89890163A 1988-06-21 1989-06-14 Utilisation d'un alliage à base de fer pour la fabrication de pièces frittées, présentant une haute résistance à la corrosion, une haute résistance à l'usure ainsi qu'une haute tenacité et résistance à la compression et destinées, en particulier, au travail des matières synthétiques Expired - Lifetime EP0348380B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0159988A AT393642B (de) 1988-06-21 1988-06-21 Verwendung einer eisenbasislegierung zur pulvermetallurgischen herstellung von teilen mit hoher korrosionsbestaendigkeit, hoher verschleissfestigkeit sowie hoher zaehigkeit und druckfestigkeit, insbesondere fuer die kunststoffverarbeitung
AT1599/88 1988-06-21

Publications (3)

Publication Number Publication Date
EP0348380A1 EP0348380A1 (fr) 1989-12-27
EP0348380B1 EP0348380B1 (fr) 1992-11-19
EP0348380B2 true EP0348380B2 (fr) 1996-04-17

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EP89890163A Expired - Lifetime EP0348380B2 (fr) 1988-06-21 1989-06-14 Utilisation d'un alliage à base de fer pour la fabrication de pièces frittées, présentant une haute résistance à la corrosion, une haute résistance à l'usure ainsi qu'une haute tenacité et résistance à la compression et destinées, en particulier, au travail des matières synthétiques

Country Status (8)

Country Link
EP (1) EP0348380B2 (fr)
JP (1) JP2583451B2 (fr)
AT (2) AT393642B (fr)
AU (1) AU615756B2 (fr)
DE (1) DE58902742D1 (fr)
ES (1) ES2052971T5 (fr)
PT (1) PT90925B (fr)
ZA (1) ZA894703B (fr)

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JP2684736B2 (ja) * 1988-12-27 1997-12-03 大同特殊鋼株式会社 粉末冷間工具鋼
AT405193B (de) * 1995-01-16 1999-06-25 Boehler Edelstahl Verwendung einer chromhältigen, martensitischen eisenbasislegierung für kunststofformen
GB2298869B (en) * 1995-03-10 1999-03-03 Powdrex Ltd Stainless steel powders and articles produced therefrom by powder metallurgy
US5679908A (en) * 1995-11-08 1997-10-21 Crucible Materials Corporation Corrosion resistant, high vanadium, powder metallurgy tool steel articles with improved metal to metal wear resistance and a method for producing the same
US5900560A (en) * 1995-11-08 1999-05-04 Crucible Materials Corporation Corrosion resistant, high vanadium, powder metallurgy tool steel articles with improved metal to metal wear resistance and method for producing the same
DE19924515A1 (de) * 1999-05-28 2000-11-30 Edelstahl Witten Krefeld Gmbh Sprühkompaktierter Stahl, Verfahren zu seiner Herstellung und Verbundwerkstoff
ATE291645T1 (de) * 2001-11-13 2005-04-15 Fundacion Inasmet Verfahren zur herstellung von produkten aus carbidverstärkten baumetallmaterialien
RU2283888C2 (ru) * 2001-11-13 2006-09-20 Фундасьон Инасмет Изготовление продукта из конструкционных металлических материалов, армированных карбидами
SE0200429D0 (sv) * 2002-02-15 2002-02-15 Uddeholm Tooling Ab Stållegering och verktyg tillverkat av stållegeringen
US20060231167A1 (en) * 2005-04-18 2006-10-19 Hillstrom Marshall D Durable, wear-resistant punches and dies
AT501794B1 (de) * 2005-04-26 2008-06-15 Boehler Edelstahl Kunststoffform
SE535090C2 (sv) * 2010-03-17 2012-04-10 Uddeholms Ab Förfarande för framställning av en slitplatta för en bandsågsbladstyrning, en sådan slitplatta, samt användning av ett stålmaterial för tillverkning av slitplattan
CN103060700B (zh) * 2013-01-07 2014-12-31 北京工业大学 硼化物颗粒强化Fe-Cr-Al复合材料及其制造方法
CN104878298B (zh) * 2015-05-15 2017-05-03 安泰科技股份有限公司 粉末冶金耐磨损耐腐蚀合金
DE102017115396A1 (de) * 2017-07-10 2019-01-10 Saar-Pulvermetall GmbH Rolle für eine Mahl- oder/und Pressvorrichtung, insbesondere Kollerrolle für eine Presse zur Herstellung von Pellets, und Verfahren zur Herstellung der Rolle
JP7572384B2 (ja) 2019-07-09 2024-10-23 エリコン メテコ（ユーエス）インコーポレイテッド 耐摩耗性と耐食性のために設計された鉄ベースの合金
CN111850427A (zh) * 2020-06-07 2020-10-30 江苏钢银智能制造有限公司 一种合金钢材料及其钢板材加工铸造工艺
JP2022182485A (ja) * 2021-05-28 2022-12-08 山陽特殊製鋼株式会社 耐食性に優れた工具鋼

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Also Published As

Publication number Publication date
AT393642B (de) 1991-11-25
ATA159988A (de) 1991-05-15
ES2052971T5 (es) 1996-10-01
PT90925B (pt) 1997-10-31
JP2583451B2 (ja) 1997-02-19
ATE82595T1 (de) 1992-12-15
EP0348380A1 (fr) 1989-12-27
PT90925A (pt) 1989-12-29
ES2052971T3 (es) 1994-07-16
EP0348380B1 (fr) 1992-11-19
AU3666289A (en) 1990-01-25
ZA894703B (en) 1992-01-29
AU615756B2 (en) 1991-10-10
DE58902742D1 (de) 1992-12-24
JPH0277556A (ja) 1990-03-16

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