EP1250205B1 - Herstellungsverfahren für ein kantiges, rostfreies strahlmittel auf basis einer fe-cr-c-legierung - Google Patents

Herstellungsverfahren für ein kantiges, rostfreies strahlmittel auf basis einer fe-cr-c-legierung Download PDF

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Publication number
EP1250205B1
EP1250205B1 EP01942587A EP01942587A EP1250205B1 EP 1250205 B1 EP1250205 B1 EP 1250205B1 EP 01942587 A EP01942587 A EP 01942587A EP 01942587 A EP01942587 A EP 01942587A EP 1250205 B1 EP1250205 B1 EP 1250205B1
Authority
EP
European Patent Office
Prior art keywords
alloy
process according
gas mixture
stainless
chromium
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
EP01942587A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1250205A1 (de
Inventor
Reinhard SÄNGER
Oliver Zyto
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.)
Vulkan Inox GmbH
Original Assignee
Vulkan Strahltechnik GmbH
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 Vulkan Strahltechnik GmbH filed Critical Vulkan Strahltechnik GmbH
Publication of EP1250205A1 publication Critical patent/EP1250205A1/de
Application granted granted Critical
Publication of EP1250205B1 publication Critical patent/EP1250205B1/de
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
    • C22C38/36—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.7% by weight of carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/14—Treatment of metallic powder
    • B22F1/142—Thermal or thermo-mechanical treatment
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • 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%
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/76—Adjusting the composition of the atmosphere
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr

Definitions

  • the invention relates to a method for producing abrasive grains from stainless steel casting, in which a melt is first hardenable iron-chromium-carbon alloy a granulate is produced which then undergoes a heat treatment at> 900 ° Celsius for hardening and then broken into sharp-edged grains.
  • Two categories of blasting media made of stainless steel casting are known. These are, on the one hand, granules from spherical grains, which consist of steel materials of medium hardness ( ⁇ 45HR C ). As disclosed in JP 61 257 775, sharp-edged grains made of hardened chrome cast iron (> 60HR C ) are also used because they can achieve improved abrasive properties.
  • the Production of the sharp-edged, hardened granules Compared to the abrasive grains of the first category, the Production of the sharp-edged, hardened granules a much higher Manufacturing effort with additional process steps required.
  • the Production is according to JP 61 257 775 from a melt to a curable Chromium cast iron alloy starting from a granulate in essential round grains. This is hardened by following it a heat treatment is quenched in water at 1000 ° C to 1100 ° C. After that, the grains are broken, leaving a sharp-edged material arises.
  • the present invention is based on the object To provide processes for the production of stainless abrasive, at oxidation during and after the final heat treatment of the granules can be excluded and in which the by Hardening reached brittleness of the material is so high that breaking the Blasting grain to sharp-edged granules is possible with simple means.
  • this task solved in that the heat treatment in a reducing atmosphere follows and that only for the subsequent cooling reducing gas or gas mixture is used.
  • the reducing atmosphere is expediently a Gas mixture containing hydrogen and nitrogen.
  • Gas mixture is suitable, the 60% to 80% hydrogen and 20% to 40% nitrogen contains. The best results were achieved with 70% hydrogen and 30% Nitrogen.
  • a vibrating tube mill is particularly suitable, order the desired sharp-edged from the hardened starting material To produce granules.
  • the abrasive is classified according to the grain size.
  • a further process step for grain fractionation with which the setting of the desired grain mixture is achieved, can be connected downstream of the production method according to the invention.
  • the drawing shows a flow diagram of the manufacturing process, the the upper part comprises the process steps for producing the starting granulate, while the lower part shows hardening, breaking and classifying.
  • the starting material for the abrasive is steel scrap, which is the manufacturing process is fed from a scrap warehouse 1.
  • the desired Alloy is shaped into carbon from suitable storage containers of graphite 2 and chrome 3 added.
  • the raw material mixture is then in one Melting furnace 4 melted into an alloy. This contains 2.0% carbon and 30% to 32% chromium.
  • the melt passes through at a temperature of more than 1420 ° Celsius Spraying device 5, wherein a granulate with a wide range of Grain diameter arises.
  • the atomized droplets of the molten metal become quenched in a water bath so that solid granules settle to the bottom a granulation basin 6 accumulates.
  • Cooling 10 is the starting material for the rust-resistant Chrome cast alloy before.
  • the starting granulate is now fed to a furnace 11, in which it is annealed at more than 900 ° C. in an atmosphere of hydrogen and nitrogen 13 at low pressure and then cooled, after which it is conveyed into a storage container 12.
  • a furnace 11 By annealing the granulate at> 900 ° C, secondary carbides are separated from the alloy-rich matrix, which changes the composition of the matrix.
  • a martensite conversion is only possible through the separation of the secondary carbides, which then leads to an increase in hardness to> 60 HR C when the granules cool down from temperatures> 900 ° C.
  • the granulate is removed from the container 12 by means of a bucket elevator 14 Crushers 15 fed.
  • the crusher 15 is preferably a vibrating tube mill trained and crushed the hardened, brittle granules to sharp edges Failure bodies. The use of such pulse mills makes it possible especially good, the material under strong internal tension disassemble sharp-edged fragments. The one created when breaking Grain mix has a wide size distribution.
  • Now for classification pass through a screening plant 16.
  • the crusher becomes too coarse oversize 17 fed again.
  • the too fine undersize 18 becomes the process at this point removed and melted in the melting furnace 4.
  • Gutkom 19 with one Diameters between 0.1 and 0.8 mm are either stored in a silo 20 or abandoned for fine classification of another screening plant 21. Blasting media with different grain sizes are used in silos 22, 23 and 24 stocked until removed for shipment to the end user become.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Powder Metallurgy (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Heat Treatment Of Steel (AREA)
  • Conductive Materials (AREA)
  • Golf Clubs (AREA)
  • Eyeglasses (AREA)
  • Heat Treatment Of Articles (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
EP01942587A 2000-01-22 2001-01-11 Herstellungsverfahren für ein kantiges, rostfreies strahlmittel auf basis einer fe-cr-c-legierung Expired - Lifetime EP1250205B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10002738 2000-01-22
DE10002738A DE10002738A1 (de) 2000-01-22 2000-01-22 Herstellungsverfahren für ein kantiges, rostfreies Strahlmittel auf Basis einer Fe-Cr-C-Legierung
PCT/EP2001/000252 WO2001053022A1 (de) 2000-01-22 2001-01-11 Herstellungsverfahren für ein kantiges, rostfreies strahlmittel auf basis einer fe-cr-c-legierung

Publications (2)

Publication Number Publication Date
EP1250205A1 EP1250205A1 (de) 2002-10-23
EP1250205B1 true EP1250205B1 (de) 2003-06-25

Family

ID=7628430

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01942587A Expired - Lifetime EP1250205B1 (de) 2000-01-22 2001-01-11 Herstellungsverfahren für ein kantiges, rostfreies strahlmittel auf basis einer fe-cr-c-legierung

Country Status (20)

Country Link
US (1) US6764557B2 (es)
EP (1) EP1250205B1 (es)
JP (1) JP5085826B2 (es)
KR (1) KR100790097B1 (es)
CN (1) CN1245269C (es)
AT (1) ATE243594T1 (es)
AU (1) AU769520B2 (es)
BR (1) BR0107685A (es)
CA (1) CA2397953C (es)
CZ (1) CZ296109B6 (es)
DE (2) DE10002738A1 (es)
DK (1) DK1250205T3 (es)
EA (1) EA003956B1 (es)
ES (1) ES2202290T3 (es)
NZ (1) NZ520233A (es)
PT (1) PT1250205E (es)
SI (1) SI20913A (es)
UA (1) UA73545C2 (es)
WO (1) WO2001053022A1 (es)
ZA (1) ZA200205764B (es)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6797080B2 (en) * 2001-07-09 2004-09-28 Showa Denko Kabushiki Kaisha Method for producing spraying material
ITTV20010155A1 (it) * 2001-11-27 2003-05-27 Pometon S P A Procedimento per l'ottenimento di una miscela abrasiva particolarmente per la segagione dei marmi e prodotto cos£ ottenuto
US20060285989A1 (en) * 2005-06-20 2006-12-21 Hoeganaes Corporation Corrosion resistant metallurgical powder compositions, methods, and compacted articles
CN102390044A (zh) * 2011-10-25 2012-03-28 张铮 一种钢砂的制作方法
AT13691U1 (de) * 2013-09-02 2014-06-15 Plansee Se Chrommetallpulver
FR3035607B1 (fr) * 2015-04-30 2017-04-28 Saint-Gobain Centre De Rech Et D'Etudes Europeen Procede de modification de l'aspect d'une surface
DE112019000541T5 (de) * 2018-01-25 2020-10-08 Sintokogio, Ltd. Schleudermaterial und Strahlverfahren
DE102019133017A1 (de) * 2019-12-04 2021-06-10 Vulkan Inox Gmbh Abrasiv zum Strahlschneiden

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2443978C3 (de) * 1974-09-12 1982-04-15 Mannesmann AG, 4000 Düsseldorf Verfahren zum Herstellen von Eispulver
DE2813018A1 (de) * 1978-03-23 1979-10-11 Powdrex Ltd Verfahren zur herstellung von metallartikeln aus metallpulver
GB2114605B (en) * 1982-01-21 1985-08-07 Davy Loewy Ltd Annealing steel powder
US4448746A (en) * 1982-11-05 1984-05-15 Sumitomo Metal Industries, Ltd. Process for producing alloy steel powder
JPS61257775A (ja) * 1985-05-08 1986-11-15 Mitsubishi Heavy Ind Ltd 研掃材
JPS6299080A (ja) * 1985-10-24 1987-05-08 Nippon Yakin Kogyo Co Ltd 研掃用金属粒子
JPH01234504A (ja) * 1988-03-12 1989-09-19 Yoshikawa Kogyo Co Ltd 焼結用微細鉄粉の製造法
JPH0645801B2 (ja) * 1989-04-17 1994-06-15 川崎製鉄株式会社 Ｃｒ系合金鋼粉の仕上熱処理方法
DE4030054C2 (de) * 1990-09-20 1995-11-02 Mannesmann Ag Verfahren und Anlage zum Reduktionsglühen von Eisenpulver
CA2101758A1 (en) 1991-02-01 1992-08-02 Stephen E. Lebeau Method of recycling scrap metal
JPH08174034A (ja) * 1994-12-21 1996-07-09 Nippon Steel Corp Ｃｒ系ステンレス鋼板の製造方法
JPH09213664A (ja) * 1996-02-07 1997-08-15 Furontetsuku:Kk 基体の処理方法及び処理装置
DE19815087A1 (de) 1998-04-06 1999-10-07 Vulkan Strahltechnik Gmbh Nichtrostendes Strahlmittel
US6358298B1 (en) * 1999-07-30 2002-03-19 Quebec Metal Powders Limited Iron-graphite composite powders and sintered articles produced therefrom

Also Published As

Publication number Publication date
CA2397953A1 (en) 2001-07-26
NZ520233A (en) 2004-12-24
ES2202290T3 (es) 2004-04-01
EA200200784A1 (ru) 2003-02-27
JP2003524690A (ja) 2003-08-19
SI20913A (sl) 2002-12-31
AU769520B2 (en) 2004-01-29
DE50100333D1 (de) 2003-07-31
WO2001053022A1 (de) 2001-07-26
CN1245269C (zh) 2006-03-15
CA2397953C (en) 2009-11-10
ATE243594T1 (de) 2003-07-15
CZ20022532A3 (cs) 2003-01-15
KR100790097B1 (ko) 2007-12-31
EP1250205A1 (de) 2002-10-23
DK1250205T3 (da) 2003-09-29
UA73545C2 (en) 2005-08-15
BR0107685A (pt) 2002-11-19
ZA200205764B (en) 2003-11-04
US20030136224A1 (en) 2003-07-24
JP5085826B2 (ja) 2012-11-28
PT1250205E (pt) 2003-11-28
DE10002738A1 (de) 2001-07-26
EA003956B1 (ru) 2003-10-30
AU2846301A (en) 2001-07-31
CN1422194A (zh) 2003-06-04
KR20020080380A (ko) 2002-10-23
US6764557B2 (en) 2004-07-20
CZ296109B6 (cs) 2006-01-11

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