EP0733719A1 - 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
EP0733719A1
EP0733719A1 EP96890050A EP96890050A EP0733719A1 EP 0733719 A1 EP0733719 A1 EP 0733719A1 EP 96890050 A EP96890050 A EP 96890050A EP 96890050 A EP96890050 A EP 96890050A EP 0733719 A1 EP0733719 A1 EP 0733719A1
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EP
European Patent Office
Prior art keywords
iron
max
weight
aluminum
bis
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.)
Granted
Application number
EP96890050A
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German (de)
English (en)
Other versions
EP0733719B1 (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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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 at elevated temperatures, in particular hot-work 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 as well as manufacturing-related steel companions and impurities.
  • the invention relates to a tool, in particular for the non-cutting hot forming of metals and alloys.
  • Iron-based alloys that can be used at elevated temperatures are characterized by the fact that the tools made from them have a hardness that is essentially the same as at room temperature, even at working temperatures of 400 ° C to 500 ° C, after appropriate thermal treatment.
  • the high hot hardness or the secondary hardness formed when the hardened material is tempered is achieved by the alloy elements chromium, molybdenum and tungsten and in particular vanadium and possibly also niobium.
  • metal carbides are formed again at low cooling rates or the time available for high atomic rates is or carbon diffusion is not sufficient for carbide formation, so that the lattice with carbon atoms small atomic volume distorted, folded into an alpha configuration without diffusion, forming a hard martensite structure, with cubic surface-centered remaining areas, so-called remaining parts, being retained.
  • a material of this type is often brittle and, due to the residual austenite content, may have low or increased hardness.
  • Hot-work steels such as an iron-based alloy in accordance with DIN material no.1.2343 or in accordance with AISI Type H 11, are the experts in terms of composition, manufacture and the required thermal tempering parameters for the highest achievable hardness, strength and toughness values at operating temperatures up to approx. 500 ° C known.
  • the invention is based on the object of specifying an iron-based alloy for use at elevated temperature, in particular a hot-working steel for tools for non-cutting hot forming of metals and alloys, which, in comparison with known alloys, permits higher working temperatures and has improved material properties.
  • Another object of the invention is to provide a tool, in particular for non-cutting hot forming of metals and alloys, which has favorable mechanical characteristics, improved performance properties and an increased service life at operating temperatures of over 500 ° C.
  • Nickel above 0.35% by weight probably deteriorates the temperability of the material by stabilizing the remaining austenite.
  • a particularly high property level is achieved when using a tempered tool in the temperature range from 450 ° C to 570 ° C and beyond.
  • a niobium content in the range of 0.03 to 0.1% by weight not only results in a fine grain of the material with its advantageous effects but also supports the formation of the secondary hardness hump when the hardened material is tempered and its shift to higher temperatures. Titanium concentrations of up to 0.09% by weight promote fine granularity, higher contents reduce the hardness of the alloy. Oxygen contents higher than 0.006% by weight have an unfavorable effect on the mechanical high-temperature properties and in particular impair the polishability of the material.
  • a sulfur content in the range from 0.05 to 0.16% by weight is advantageous for improved mechanical processing thereof.
  • the highest notched impact strength values are achieved even at high application temperatures of the iron-based alloy if, furthermore, as can be provided in a favorable manner, a low phosphorus concentration in the steel of at most 0.01% by weight is set.
  • 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 further embodiment of the invention, if the total Cr content, Mo, Si and Al of the alloy have values between 7.6 and 8.8% by weight, an extremely safe, largely process-insensitive conversion behavior is achieved with a particularly fine microstructure during hardening and tempering of 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% proof stress of at least 1060, preferably of 1070, N / mm 2 , 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 the values indicated above, an optimum property level of the hot working tool is achieved. This applies not only to the mechanical values at high working temperatures but also to lower heat wear, increased creep rupture strength, reduced susceptibility to fire cracking and less tendency to stick, for example, of the forging blank on the die. Although exact scientific data are still lacking, the hot work steel is likely to form an oxide layer on the work surfaces due to the intended high aluminum content in high-temperature operation, which in combination with other alloy elements has high adhesion and abrasion resistance and reduces the tendency to stick to the workpiece.
  • a nitriding layer with high hardness has proven to be particularly advantageous for this because, on the one hand, an increased aluminum content of the material promotes absorption of nitrogen or the formation of a nitriding layer and a hard layer can be formed in a particularly simple manner, on the other hand the layer with increased hardness has an increased volume and thereby generates compressive stresses in the area of the tool near the work surface and significantly reduces the tendency to crack will.
  • the nitrogen in the air probably causes a further nitriding of the surface in the case of a tool with a high working temperature due to the aluminum content of the material, so that the thickness of the hard layer is largely retained even if there is little abrasion in practical use.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Ceramic Products (AREA)
  • Soft Magnetic Materials (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
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 true EP0733719A1 (fr) 1996-09-25
EP0733719B1 EP0733719B1 (fr) 1999-03-03

Family

ID=3492683

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96890050A Expired - Lifetime EP0733719B1 (fr) 1995-03-23 1996-03-19 Alliage à base de fer pour applications aux températures élevées

Country Status (4)

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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1887096A1 (fr) * 2006-08-09 2008-02-13 Rovalma, S.A. Acier pour travail à chaud
EP2194155A1 (fr) * 2008-11-20 2010-06-09 Böhler Edelstahl GmbH & Co KG Alliage d'acier pour travail à chaud
EP2682491B1 (fr) 2011-03-03 2018-07-04 Hitachi Metals, Ltd. Acier pour outil de travail à chaud doté d'une excellente ténacité et son procédé de production
EP3050986B1 (fr) 2013-09-27 2019-07-31 Hitachi Metals, Ltd. Acier pour outil à vitesse élevée et procédé de production de ce dernier

Families Citing this family (3)

* 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
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

Citations (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
US4729872A (en) * 1985-09-18 1988-03-08 Hitachi Metals, Ltd. Isotropic tool steel
JPS63140066A (ja) * 1986-12-02 1988-06-11 Hitachi Metals Ltd ピストンリング材
EP0425471A1 (fr) * 1989-10-23 1991-05-02 BÖHLER Edelstahl GmbH Acier à outils pour le façonnage à froid, à haute résistance à la compression et application de ces aciers

Patent Citations (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
US4729872A (en) * 1985-09-18 1988-03-08 Hitachi Metals, Ltd. Isotropic tool steel
JPS63140066A (ja) * 1986-12-02 1988-06-11 Hitachi Metals Ltd ピストンリング材
EP0425471A1 (fr) * 1989-10-23 1991-05-02 BÖHLER Edelstahl GmbH Acier à outils pour le façonnage à froid, à haute résistance à la compression et application de ces aciers

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 7830, Derwent World Patents Index; AN 78-54635A, XP002007871 *
PATENT ABSTRACTS OF JAPAN vol. 005, no. 016 (C - 041) 30 January 1981 (1981-01-30) *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 398 (C - 538) 21 October 1988 (1988-10-21) *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1887096A1 (fr) * 2006-08-09 2008-02-13 Rovalma, S.A. Acier pour travail à chaud
WO2008017341A1 (fr) * 2006-08-09 2008-02-14 Rovalma, S.A. Procédé d'ajustement de la conductivité thermique d'un acier, acier à outils, notamment acier à outils pour travail à chaud et article en acier
US8557056B2 (en) 2006-08-09 2013-10-15 Rovalma, S.A. Process for setting the thermal conductivity of a steel, tool steel, in particular hot-work steel, and steel object
EP3228724A1 (fr) * 2006-08-09 2017-10-11 Rovalma, S.A. Procédé de réglage de la conductivité thermique d'un acier, acier à outil, en particulier acier pour travail à chaud et objet en acier
EP2194155A1 (fr) * 2008-11-20 2010-06-09 Böhler Edelstahl GmbH & Co KG Alliage d'acier pour travail à chaud
EP2682491B1 (fr) 2011-03-03 2018-07-04 Hitachi Metals, Ltd. Acier pour outil de travail à chaud doté d'une excellente ténacité et son procédé de production
EP3050986B1 (fr) 2013-09-27 2019-07-31 Hitachi Metals, Ltd. Acier pour outil à vitesse élevée et procédé de production de ce dernier

Also Published As

Publication number Publication date
DE59601353D1 (de) 1999-04-08
ES2128828T3 (es) 1999-05-16
EP0733719B1 (fr) 1999-03-03
ATE177159T1 (de) 1999-03-15
ATA51695A (de) 1997-03-15
AT403058B (de) 1997-11-25

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