EP0733719B1 - Alliage à base de fer pour applications aux températures élevées - Google Patents

Alliage à base de fer pour applications aux températures élevées Download PDF

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Publication number
EP0733719B1
EP0733719B1 EP96890050A EP96890050A EP0733719B1 EP 0733719 B1 EP0733719 B1 EP 0733719B1 EP 96890050 A EP96890050 A EP 96890050A EP 96890050 A EP96890050 A EP 96890050A EP 0733719 B1 EP0733719 B1 EP 0733719B1
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EP
European Patent Office
Prior art keywords
iron
weight
max
alloy
aluminium
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
EP96890050A
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German (de)
English (en)
Other versions
EP0733719A1 (fr
Inventor
Hubert Dipl. Ing. Lenger
Herbert Ing. Schweiger
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.)
Voestalpine Boehler Edelstahl GmbH
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Boehler Edelstahl GmbH
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Application filed by Boehler Edelstahl GmbH filed Critical Boehler Edelstahl GmbH
Publication of EP0733719A1 publication Critical patent/EP0733719A1/fr
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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
    • C22C38/22—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

Definitions

  • the invention relates to an iron-based alloy for use with increased Temperature, especially hot working steel for tools for non-cutting Hot forming of metals and alloys, for example iron, copper or Aluminum alloys containing at least the elements carbon, silicon, Manganese, chromium, molybdenum and / or tungsten, vanadium, aluminum, if appropriate Sulfur as well as manufacturing-related steel components and impurities.
  • metals and alloys for example iron, copper or Aluminum alloys containing at least the elements carbon, silicon, Manganese, chromium, molybdenum and / or tungsten, vanadium, aluminum, if appropriate Sulfur as well as manufacturing-related steel components and impurities.
  • the invention relates to a tool, in particular for non-cutting Hot forming of metals and alloys.
  • Hot working steels are characterized by the fact that they are made from them Tools with the appropriate thermal tempering also for Working temperatures from 400 ° C to 500 ° C an essentially equally high hardness as at room temperature.
  • the high warm hardness or that when starting of the hardened material is formed by the secondary hardness Alloy elements chromium, molybdenum as well as tungsten and in particular vanadium and possibly also reached niobium.
  • Warning steel such as an iron-based alloy according to DIN Material no. 1.2343 or according to AISI Type H 11 are regarding the Composition, manufacture and the required thermal Remuneration parameters for highest achievable hardness, strength and Toughness values at operating temperatures up to approx. 500 ° C are known to the person skilled in the art.
  • the invention is based on the object of an iron-based alloy Use at elevated temperature, especially a hot-work steel for Tools for non-cutting hot forming of metals and alloys, indicate which or which higher in comparison with known alloys Permits working temperatures and has improved material properties.
  • Temperature of over 500 ° C increases the working hardness, the fire crack resistance improved and the material toughness increased.
  • a tool, in particular for a chipless hot forming of Metals and alloys which can be used at operating temperatures of over 500 ° C favorable mechanical parameters, improved performance properties and has an increased lifespan.
  • Nickel and nitrogen are of particular importance.
  • Nickel over 0.35% by weight probably deteriorates the temperability of the material a stabilization of the remaining austenite.
  • a nitrogen concentration greater than 0.015% by weight causes the formation of aluminum nitride, which has grain boundaries accumulated a disproportionate decrease in the toughness values of the material can cause.
  • the material has the following elements in% by weight: carbon 0.30 to 0.50 Silicon (Si) 0.75 to 1.60 manganese 0.30 to 0.80 chrome 3.20 to 6.50 Molybdenum (Mo) 0 to 1.65 Tungsten (W) 0 to 3.00 (Mon + W / 2) 0.95 to 1.65 Vanadium 0.25 to 1.20 Aluminum (Al) 0.75 to 1.60 (Al + Si) 1.60 to 2.60 niobium 0 to 0.15 titanium 0 to 0.15 nickel max 0.35 nitrogen max 0.015 Remainder iron and accompanying elements.
  • the iron-based alloy for use at elevated temperature particularly preferably has contents of essentially the following elements in% by weight: carbon 0.35 to 0.40 Silicon (Si) 0.90 to 1.20 manganese 0.35 to 0.55 chrome 4.50 to 5.50 Molybdenum (Mo) 0.75 to 1.50 Tungsten (W) 0 to 1.50 (Mon + W / 2) 1.20 to 1.50 Vanadium 0.30 to 0.60 Aluminum (Al) 0.80 to 1.25 (Al + Si) 1.85 to 2.40 niobium 0.03 to 0.1 titanium 0 to 0.09 nickel max 0.18 nitrogen max 0.009 oxygen max. 0.006 as an accompanying element
  • a Niobium content in the range of 0.03 to 0.1% by weight not only results in fine grain of the material with its beneficial effects but also supports the Formation of the secondary hardness hump when tempering the hardened material and its shift to higher temperatures. Titanium concentrations up to 0.09 % By weight promotes fine-grainedness, higher contents reduce one Hardness assumption of the alloy. Oxygen contents higher than preferably 0.006% by weight act adversely affect the mechanical high temperature properties and deteriorate in particular a polishability of the material.
  • Iron based alloy for use at elevated temperature Sulfur in the range of in wt .-% 0.05 to 0.16 advantageous for an improved mechanical processing of the same.
  • the total concentration of the important ferrite-forming elements in the material has a decisive influence on the formation of the structure of the tempering structure and thus on the performance properties of the part. If, as in a preferred embodiment of the invention, the total content of Cr, Mo, Si and Al of the alloy has values between 7.6 and 8.8% by weight, an extremely safe, largely process-insensitive conversion behavior with a particularly fine microstructure achieved when hardening and tempering the material.
  • the further aim of the invention is achieved in a tool of the type mentioned at the outset if it has a chemical composition of the material according to one of Claims 1 to 4 and a material hardness of at least 53, preferably at least 54, HRC, a tensile strength of at least 1195, preferably of at least 1200, N / mm 2 , a 0.2% Yield strength of at least 1060, preferably of 1070, N / mm 2 , has an elongation and contraction of at least 18.5 or 60%, preferably of at least 20 or 66%, at a temperature of 500 ° C to 550 ° C .
  • the alloy according to the invention is thermally tempered to at least values marked above will be an optimal property level of the Hot work tool reached. This affects not only the mechanical values at high working temperature but also less warm wear, increased creep rupture strength, reduced fire crack sensitivity and less For example, the forging blank tends to stick to the die. Although exact scientific data is still missing, the hot-work steel is likely to be provided high aluminum content in high temperature operation an oxide layer form on the work surfaces, which in association with other alloy elements has high adhesion and abrasion resistance and the tendency to stick to Workpiece reduced.

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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)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Soft Magnetic Materials (AREA)
  • Ceramic Products (AREA)

Claims (9)

  1. Alliage à base de fer, pour utilisation à haute température, en particulier acier pour usinage à chaud pour outils destinés au formage à chaud sans enlèvement de copeaux de métaux et d'alliages, par exemple d'alliages de fer, cuivre ou aluminium, contenant au moins les éléments carbone, silicium, manganèse, chrome, molybdène et/ou tungstène, vanadium, aluminium, éventuellement soufre, ainsi que des impuretés et des éléments associés à l'acier, dus à la fabrication, caractérisé par les teneurs en les éléments suivants, en % en poids: carbone 0,30 à 0,50 silicium (Si) 0,40 à 1,60 manganèse 0,30 à 0,80 soufre 0 à 0,16 chrome (Cr) 3,20 à 6,50 molybdène (Mo) 0 à 2,00 tungstène (W) 0 à 3,00 (Mo + W/2) 0,95 à 2,00 vanadium 0,25 à 1,20 aluminium (Al) 0,75 à 1,60 (Al + Si) 1,20 à 2,60 niobium 0 à 0,20 titane 0 à 0,15 nickel max. 0,35 azote max. 0,015
    ainsi que par une teneur en la somme (Cr+Mo+Si+Al) allant de 4,4 à 11,1,
    le reste étant constitué de fer et d'éléments associés.
  2. Alliage à base de fer selon la revendication 1, caractérisé par les teneurs en les éléments suivants, en % en poids: carbone 0,30 à 0,50 silicium (Si) 0,75 à 1,60 manganèse 0,30 à 0,80 chrome 3,20 à 6,50 molybdène (Mo) 0 à 1,65 tungstène (W) 0 à 3,00 (Mo + W/2) 0,95 à 1,65 vanadium 0,25 à 1,20 aluminium (Al) 0,75 à 1,60 (Al + Si) 1,60 à 2,60 niobium 0 à 0,15 titane 0 à 0,15 nickel max. 0,35 azote max. 0,015
    le reste étant constitué de fer et d'éléments associés.
  3. Alliage à base de fer selon la revendication 1 ou 2, caractérisé par les teneurs en les éléments suivants, en % en poids: carbone 0,35 à 0,40 silicium (Si) 0,90 à 1,20 manganèse 0,35 à 0,55 chrome 4,50 à 5,50 molybdène (Mo) 0,75 à 1,50 tungstène (W) 0 à 1,50 (Mo + W/2) 1,20 à 1,50 vanadium 0,30 à 0,60 aluminium (Al) 0,80 à 1,25 (Al + Si) 1,85 à 2,40 niobium 0,03 à 0,1 titane 0 à 0,09 nickel max. 0,18 azote max. 0,009 oxygène max. 0,006 en tant qu'élément asocié.
  4. Alliage selon l'une des revendications 1 à 3, caractérisé par une teneur en soufre, en % en poids, allant de 0,05 à 0,16.
  5. Alliage selon l'une des revendications 1 à 4, caractérisé par une teneur en phosphore, en tant qu'élément associé, de 0,01 % en poids au maximum.
  6. Alliage selon l'une des revendications 1 à 5, caractérisé par une teneur en la somme de Cr+Mo+Si+Al, en % en poids, allant de 7,6 à 8,8.
  7. Outil, en particulier pour un formage à chaud sans enlèvement de copeaux de métaux et d'alliages, par exemple d'alliages de fer, cuivre ou aluminium, caractérisé par une composition chimique de l'outil selon l'une des revendications 1 à 6 et une dureté de matériau, ajustée par un traitement thermique, d'au moins 53, de préférence d'au moins 54 DRC (dureté Rockwell C), une résistance à la traction d'au moins 1 195, de préférence d'au moins 1 200 N/mm2, une limite d'élasticité à 0,2 % d'au moins 1 060, de préférence de 1 070 N/mm2, un allongement et une striction d'au moins 18,5 et 60 %, respectivement, de préférence d'au moins 20 et 66 %, respectivement, à une température de 500 à 550°C.
  8. Outil selon la revendication 7, caractérisé par des surfaces d'usinage à dureté au moins partiellement encore accrue.
  9. Outil selon la revendication 7 ou 8, caractérisé par des surfaces d'usinage qui au moins en partie présentent une couche de nitruration à haute dureté.
EP96890050A 1995-03-23 1996-03-19 Alliage à base de fer pour applications aux températures élevées Expired - Lifetime EP0733719B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT516/95 1995-03-23
AT0051695A AT403058B (de) 1995-03-23 1995-03-23 Eisenbasislegierung zur verwendung bei erhöhter temperatur und werkzeug aus dieser legierung

Publications (2)

Publication Number Publication Date
EP0733719A1 EP0733719A1 (fr) 1996-09-25
EP0733719B1 true EP0733719B1 (fr) 1999-03-03

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EP96890050A Expired - Lifetime EP0733719B1 (fr) 1995-03-23 1996-03-19 Alliage à base de fer pour applications aux températures élevées

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EP (1) EP0733719B1 (fr)
AT (2) AT403058B (fr)
DE (1) DE59601353D1 (fr)
ES (1) ES2128828T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007014407A1 (de) * 2007-03-26 2008-10-02 Ejot Baubefestigungen Gmbh Schraube mit selbstfurchendem Gewinde mit einem Schaft aus korrosionsbeständigem Stahl und einer daran gefügten harten Spitze
DE102007014408A1 (de) * 2007-03-26 2008-10-02 Ejot Baubefestigungen Gmbh Schraube mit selbstfurchendem Gewinde

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT410447B (de) 2001-10-03 2003-04-25 Boehler Edelstahl Warmarbeitsstahlgegenstand
EP1887096A1 (fr) 2006-08-09 2008-02-13 Rovalma, S.A. Acier pour travail à chaud
AT506790B1 (de) * 2008-11-20 2009-12-15 Boehler Edelstahl Gmbh & Co Kg Warmarbeitsstahl-legierung
WO2012118053A1 (fr) 2011-03-03 2012-09-07 日立金属株式会社 Acier pour outil de travail à chaud doté d'une excellente ténacité et son procédé de production
CN111411293A (zh) 2013-09-27 2020-07-14 日立金属株式会社 高速工具及其制造方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5370940A (en) * 1976-12-06 1978-06-23 Hitachi Metals Ltd Nitriding steel for hot tool and structure
JPS55145155A (en) * 1979-04-25 1980-11-12 Daido Steel Co Ltd Suction valve
JPS58113352A (ja) * 1981-12-28 1983-07-06 Daido Steel Co Ltd 熱間加工用合金鋼
JPH0765141B2 (ja) * 1985-09-18 1995-07-12 日立金属株式会社 熱間加工用工具鋼
JPS63140066A (ja) * 1986-12-02 1988-06-11 Hitachi Metals Ltd ピストンリング材
AT393387B (de) * 1989-10-23 1991-10-10 Boehler Gmbh Kaltarbeitsstahl mit hoher druckfestigkeit und verwendung dieses stahles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007014407A1 (de) * 2007-03-26 2008-10-02 Ejot Baubefestigungen Gmbh Schraube mit selbstfurchendem Gewinde mit einem Schaft aus korrosionsbeständigem Stahl und einer daran gefügten harten Spitze
DE102007014408A1 (de) * 2007-03-26 2008-10-02 Ejot Baubefestigungen Gmbh Schraube mit selbstfurchendem Gewinde

Also Published As

Publication number Publication date
AT403058B (de) 1997-11-25
ATA51695A (de) 1997-03-15
ES2128828T3 (es) 1999-05-16
DE59601353D1 (de) 1999-04-08
EP0733719A1 (fr) 1996-09-25
ATE177159T1 (de) 1999-03-15

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