EP0939140B1 - Acier pour utiliser à hautes températures - Google Patents

Acier pour utiliser à hautes températures Download PDF

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Publication number
EP0939140B1
EP0939140B1 EP98890052A EP98890052A EP0939140B1 EP 0939140 B1 EP0939140 B1 EP 0939140B1 EP 98890052 A EP98890052 A EP 98890052A EP 98890052 A EP98890052 A EP 98890052A EP 0939140 B1 EP0939140 B1 EP 0939140B1
Authority
EP
European Patent Office
Prior art keywords
max
elements
steel
alloy
notgreater
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
EP98890052A
Other languages
German (de)
English (en)
Other versions
EP0939140A1 (fr
Inventor
Hubert Dipl.-Ing. Lenger
Herbert 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 and Co KG
Original Assignee
Boehler Edelstahl GmbH and Co KG
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
Application filed by Boehler Edelstahl GmbH and Co KG filed Critical Boehler Edelstahl GmbH and Co KG
Priority to EP98890052A priority Critical patent/EP0939140B1/fr
Priority to AT98890052T priority patent/ATE217360T1/de
Priority to ES98890052T priority patent/ES2176944T3/es
Priority to DE59804046T priority patent/DE59804046D1/de
Publication of EP0939140A1 publication Critical patent/EP0939140A1/fr
Priority to HK00101331.6A priority patent/HK1024512B/xx
Application granted granted Critical
Publication of EP0939140B1 publication Critical patent/EP0939140B1/fr
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
    • 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
    • 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

Definitions

  • Hot work tool steels mainly carbon, - chrome, - vanadium, molybdenum- and / or tungsten alloyed steels. After hardening and if necessary, repeated tempering of such materials are included Temperatures of 500 to 550 ° C hardness values of 51 to 55 HRC achievable, so that from this advantageously highly stressed hot work tools such as block sensors, Matrices and press domes for extrusion presses, die casting tools, Warm shear blades and the like can be produced.
  • Such a steel is used in Breitler R., "Recent developments in the steels for pressure die casting ", North American Die Casting Association, Illinois, USA, 1991, pages 231 ⁇ 235.
  • Hot work tools are usually one in addition to a thermal one exposed to effective high mechanical stress at the same time, resulting in results in a particularly critical form of material stress. That often through elaborate machining tools should therefore be high Heat resistance and the like toughness and tempering resistance low Hot wear behavior and low sensitivity to hot cracks, high Resistance to temperature changes and the like thermal shock resistance have a high level of economy in its use or in the To achieve product manufacturing. Because of the mostly triaxial Stress is also an isotropy of the properties of the deformed Required.
  • the invention is based on the object for an alloy of the beginning mentioned type the border areas of the pollution and accompanying elements specify within which a largely at elevated temperatures deformed material with isotropic and improved property profile can be created.
  • the advantages achieved by the invention essentially result from that even with possibly increased levels of individual impurities or Accompanying elements reduce them within a total concentration the content of other elements can be restricted by kinetics and therefore the material properties at high temperature are not disadvantageous influence, but improve overall, the range of the Material properties and their deformation-related differences in longitudinal and Transverse direction are significantly reduced.
  • the alloy achieved economic advantages and in particular the Usage properties of the tool can be improved such that a Many times the service life is achieved even under rough operating conditions.
  • Manganese is an element that can be stored in the mixed crystal and increases in this function the strength of the matrix or the material. Manganese also binds with others Elements to the sulfur of the steel for its mechanical properties less harmful sulfides. However, it was recognized that only in the area from 0.098 to 0.29% by weight of manganese in the material is advantageously effective. lower Levels of 0.098 do not ensure sulfur binding and soften if necessary, the mixed crystal of the alloy suddenly, but cause Manganese levels above 0.29% also increased signs of septicemia on the Grain boundaries and thus a loss in toughness of the material.
  • Ni and in particular Co solidify the mixed crystal and effect how the person skilled in the art is aware of an increased heat resistance of the material.
  • Cu and W in low contents act in the presence of stronger and / or more concentrated carbide formers. The However, studies have shown that the maximum total value of Ni + Co + Cu + W 0.28% by weight should not be exceeded because despite higher contents improved material strength markedly loss of toughness of the material Temperatures above 480 ° C and longer dwell times or with frequent heating enter.
  • the impurity elements P and S should naturally be low and one Do not exceed a total limit of 0.007% by weight in order to be high to achieve mechanical material properties. It was surprising that the Investigations of an interchangeability of these elements with regard to the Characteristics of the alloy showed, although only sulfur Manganese and, where appropriate, elements involved in inclusion such as Ca in particular are bound or participate in the sulfide formation.
  • Ca and Mg are extremely strong oxide and oxysulfide formers, but should not be used essential dimensions as intercalation elements in the mixed crystal due to their different atomic radii and reaction affinities exist, whereby as Total maximum content 0.0009% by weight was determined.
  • Total maximum content 0.0009% by weight was determined.
  • the lower limit of 0.00014 wt .-% is set according to the invention because lower values mean a steep drop in some Material properties.
  • strong carbide formers in particular the monocarbide-forming elements Ti, Nb, Zr, Hf, Ta in concentrations up to 0.1% with carbon contents up to 0.5% extremely effective grain refining agents, which, due to their finely dispersed carbide deposits, the isotropy of Promote materials in tempered condition.
  • the monocarbide formers a refining effect that sharp-edged excretions, however, lead to tensile loads and elevated temperatures lead to crack initiation, which is striking at levels greater than than 0.008 wt% of Ti + Nb + Zr + Hf + Ta, making this value the represents the maximum limit according to the invention.
  • W which can also form monocarbide in high concentrations, works however, also in small proportions in the mixed crystal should, as mentioned earlier, with the other storage elements Do not exceed the total limit of 0.35% by weight.
  • the alloy is using ladle metallurgical Process and is made using the VAR process because of it an efficient control and limitation of the total maximum values as well as a Setting in total ranges of contamination and accompanying elements can be done.
  • Table 1 shows the chemical composition of steels A to N with the contents of the basic elements as well as the individual and total values for the respective concentration of the contamination and accompanying elements.
  • Table 2 to Table 4 show the individual contents of impurities and accompanying elements found for steels A to N.
  • Table 5 shows the measured mechanical values of the material at 5.43 times its deformation with absolute values and those in relation to steel A.
  • a high-strength steel was used as comparative alloy A in the tables according to DIN material number 1.2343 (property specifications in DIN 17350) selected and its determined material values for the heat toughness, the Heat wear resistance and machinability set at 100%.
  • test melts were carried out using ladle metallurgical methods produced, deoxidized with different agents and cast into electrodes, after which by melting them, partly in a vacuum - Arc furnace, block production took place. These blocks were replaced by one Hot forging with a degree of deformation of 5.43 times to bar steel formed on which after hardening followed by two temperings chemical and mechanical material testing was carried out, the Results are summarized in the tables.
  • Alloys A to G, J to L and N were produced using a special technology, whereby a slag treatment with high Ca activity was carried out in the pan. Grain refining agents were also used for steels A to G and K to N. Impure scrap was, as it turned out disadvantageously in the following, used especially for alloys A, B and M. Steels H and I were manufactured with particular care with regard to the ingredients and alloys as well as the block melting. These materials according to the invention, according to H and I in Tables 1 to 4, listed in Table 5, provide significantly improved mechanical characteristics and thus an outstanding creep behavior of a tool made from them.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Heat Treatment Of Steel (AREA)
  • Soft Magnetic Materials (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Claims (4)

  1. Acier, en particulier acier pour transformation à chaud, avec un degré de déformation supérieur à 3,5 fois pour la fabrication d'outils avec des propriétés largement isotropes, notamment des propriétés de matériaux mécaniques largement isotropes à des températures allant jusqu'à 550°C, et un profil de propriétés amélioré, contenant en % en poids :
    carbone
    0,25 à 0,79
    chrome
    1,10 à 7,95
    molybdène
    0,56 à 3,49
    vanadium
    0,26 à 1,48
    et
    éléments pouvant être inclus dans le cristal mixte :
    Mn
    = mini 0,098   maxi 0,29
    ainsi que
    Ni+Co+Cu+W
    = maxi 0,35
    impuretés :
    S+P
    = maxi 0,007
    oxygène :
    O
    = maxi 0,0014
    éléments formant des oxydes :
    Si+Al
    = mini 0,081   maxi 0,25
    ainsi que
    Ca+Mg
    = mini 0,00014   maxi 0,0009
    éléments formant des monocarbures :
    Ti+Nb+Zr+Hf+Ta
    = maxi 0,008
    impuretés actives aux coupures de grain :
    As+Bi+Sb+Sn+Zn+B
    = maxi 0,009
    gaz :
    N+H
    = maxi 0,008
    le reste étant du fer.
  2. Acier selon la revendication 1, caractérisé en ce que l'alliage présente pour les groupes d'éléments suivants des valeurs cumulées en % en poids de :
    Mn
    = maxi 0,21
    Ni+Co+Cu+W
    = maxi 0,24
    S+P
    = maxi 0,004
    O
    = maxi 0,0008
    Si+Al
    = maxi 0,19
    Ca+Mg
    = maxi 0,0006
    Ti+Nb+Zr+Hf+Ta
    = maxi 0,006
    As+Bi+Sb+Sn+Zn+B
    = maxi 0,005
    N+H
    = maxi 0,006
  3. Acier selon la revendication 1 ou la revendication 2, caractérisé en ce que l'alliage présente pour les groupes d'éléments suivants des valeurs cumulées minimum en % en poids de :
    Mn
    = 0,125
    Ni+Co+Cu+W
    = 0,0029
    S+P
    = 0,00011
    O
    = 0,00004
    Si+Al
    = 0,019
    Ca+Mg
    = 0,000021
    N+H
    = 0,00011
  4. Acier selon l'une des revendications 1 à 3, caractérisé en ce que l'alliage est produit au moyen de procédés métallurgiques en poche et en utilisant le process VAR.
EP98890052A 1998-02-27 1998-02-27 Acier pour utiliser à hautes températures Expired - Lifetime EP0939140B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP98890052A EP0939140B1 (fr) 1998-02-27 1998-02-27 Acier pour utiliser à hautes températures
AT98890052T ATE217360T1 (de) 1998-02-27 1998-02-27 Eisenbasislegierung zur verwendung bei erhöhten temperaturen
ES98890052T ES2176944T3 (es) 1998-02-27 1998-02-27 Aleacion basica de hierro para utilizarse a elevadas temperaturas.
DE59804046T DE59804046D1 (de) 1998-02-27 1998-02-27 Eisenbasislegierung zur Verwendung bei erhöhten Temperaturen
HK00101331.6A HK1024512B (en) 2000-03-01 Steel for use at high temperatures

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98890052A EP0939140B1 (fr) 1998-02-27 1998-02-27 Acier pour utiliser à hautes températures

Publications (2)

Publication Number Publication Date
EP0939140A1 EP0939140A1 (fr) 1999-09-01
EP0939140B1 true EP0939140B1 (fr) 2002-05-08

Family

ID=8237148

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98890052A Expired - Lifetime EP0939140B1 (fr) 1998-02-27 1998-02-27 Acier pour utiliser à hautes températures

Country Status (4)

Country Link
EP (1) EP0939140B1 (fr)
AT (1) ATE217360T1 (fr)
DE (1) DE59804046D1 (fr)
ES (1) ES2176944T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103667941A (zh) * 2013-11-08 2014-03-26 张超 一种凸轮转子泵转子合金钢材料及其制备方法
CN106834931A (zh) * 2017-03-28 2017-06-13 宁波禾顺新材料有限公司 一种抗热疲劳的热作模具钢及其制备方法

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE511758C2 (sv) † 1998-03-27 1999-11-22 Uddeholm Tooling Ab Stålmaterial för varmarbetsverktyg
AT410447B (de) * 2001-10-03 2003-04-25 Boehler Edelstahl Warmarbeitsstahlgegenstand
RU2361008C1 (ru) * 2008-04-17 2009-07-10 Юлия Алексеевна Щепочкина Штамповая сталь
AT506790B1 (de) * 2008-11-20 2009-12-15 Boehler Edelstahl Gmbh & Co Kg Warmarbeitsstahl-legierung
AT508777B1 (de) * 2010-04-06 2011-04-15 Boehler Edelstahl Gmbh & Co Kg Geschosslauf von feuerwaffen
CN104046915B (zh) * 2014-04-28 2016-05-11 如皋市宏茂重型锻压有限公司 大截面压铸用高性能热作模具钢及其制备工艺
SE539646C2 (en) * 2015-12-22 2017-10-24 Uddeholms Ab Hot work tool steel
CN106435390A (zh) * 2016-08-31 2017-02-22 芜湖市和蓄机械股份有限公司 一种高强度连接座铸件原料配方及其制备工艺

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103667941A (zh) * 2013-11-08 2014-03-26 张超 一种凸轮转子泵转子合金钢材料及其制备方法
CN106834931A (zh) * 2017-03-28 2017-06-13 宁波禾顺新材料有限公司 一种抗热疲劳的热作模具钢及其制备方法

Also Published As

Publication number Publication date
ATE217360T1 (de) 2002-05-15
HK1024512A1 (en) 2000-10-13
DE59804046D1 (de) 2002-06-13
EP0939140A1 (fr) 1999-09-01
ES2176944T3 (es) 2002-12-01

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