EP0597832B1 - Metallpulvermischung - Google Patents

Metallpulvermischung Download PDF

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Publication number
EP0597832B1
EP0597832B1 EP90914132A EP90914132A EP0597832B1 EP 0597832 B1 EP0597832 B1 EP 0597832B1 EP 90914132 A EP90914132 A EP 90914132A EP 90914132 A EP90914132 A EP 90914132A EP 0597832 B1 EP0597832 B1 EP 0597832B1
Authority
EP
European Patent Office
Prior art keywords
graphite
max
content
metal powder
powder mixture
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
EP90914132A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0597832A1 (de
Inventor
Norbert Dautzenberg
Heinz Josef Dorweiler
Karl-Heinz Lindner
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0597832A1 publication Critical patent/EP0597832A1/de
Application granted granted Critical
Publication of EP0597832B1 publication Critical patent/EP0597832B1/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
    • 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
    • C22C33/0264—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements the maximum content of each alloying element not exceeding 5%

Definitions

  • the invention relates to a metal powder mixture for producing martensitic through-hardened, high-strength sintered parts on the basis of a steel powder formed by atomizing a steel alloy melt, which is mixed with 0.3 to 0.7% by weight of graphite powder.
  • high-strength sintered parts are understood to mean parts with a tensile strength of at least 550 N / mm2.
  • a steel alloy powder for producing high-strength sintered parts is known from EP 0 136 169 B1, which consists of (% by weight) Max. 0.02% C Max. 0.1% Si 0.4-1.3% Ni 0.2-0.5% Cu 0.1-0.3% Mo Max. 0.3% Mn Max. 0.01% N Balance iron and usual impurities.
  • This alloy powder should be cheap to manufacture and process, have good pressing properties and ensure high strength in the sintered finished part. This document does not specify anything about its properties with regard to the achievable dimensional accuracy in the finished part.
  • Sintering a compact made from steel powder normally changes its geometry.
  • martensitic hardening counteracts this effect because of the associated increase in volume as a result of the structural transformation.
  • a change in volume of the finished part compared to the compact used for sintering can also be taken into account in the design of the pressing tool, ie an attempt is made to anticipate the dimensional deviations and to compensate from the outset by changing the dimensions of the compact.
  • a sintered alloy is known from EP 0 042 654 in which the nickel content is at most 2.5%. This content in connection with the molybdenum content is important for the possibility of air hardening. With the maximum limit of 0.7% Mo disclosed in this document, however, this cannot be carried out. The improved strength of this alloy is achieved through a special heat treatment after sintering.
  • the object of the invention is to provide a metal powder mixture which can be produced with as little effort as possible and which allows the production of high-strength and wear-resistant sintered parts, the dimensional deviations of which can be kept within a tolerance band of a maximum of +/- 0.05% without this being the case additional constructive measures on the pressing tool for the production of the compacts to be sintered are required.
  • the metal powder should therefore have the property of not causing any appreciable shrinkage or waxing when sintering compacts produced therefrom with conventional compaction.
  • the proportions of the individual alloy elements are kept within different limits than in the known steel powder. It is particularly important that the ratio of the proportion of Cu to the proportion of graphite also introduced in powder form as carbon in the metal powder mixture is kept in the range 1.4-2.5, preferably 2.0. If all of the provisions of claim 1 are observed, it is surprisingly possible to produce compacts by conventional pressing processes in powder metallurgy, which under normal sintering conditions have almost complete dimensional stability regardless of the wall thicknesses of the compacts. The dimensional deviations are less than +/- 0.05%.
  • the sintered parts result in a completely martensitic structure, which gives the parts a high strength (over 750 N / mm2) without this a subsequent heat treatment is required.
  • a steel powder was produced by water atomization of a melt with the following composition (% by weight): 0.01% C 0.02% Si 0.10% Mn 4.0% Ni 0.5% Mo 0.020% P 0.010% S Balance iron and usual impurities.
  • this steel powder was dried and subjected to a reduction annealing in an H2 atmosphere at about 1000 o C. After cooling, the resulting agglomerate was ground in fine particles.
  • the residual oxygen content of the steel powder was about 0.15%, its bulk density was about 3 g / cm3.
  • the advantages of the metal powder mixture according to the invention can be seen in particular in the fact that dimensionally constant sintered parts can be produced which no longer require complex mechanical, shaping or thermal aftertreatment after sintering, and the steel powder can be produced inexpensively. It is namely applicable to the selected alloy of the invention, a water atomization with subsequent reduction under an H2 atmosphere. This eliminates the need for costly vacuum annealing, as is required for other fully alloyed water-atomized metal powders for the same purpose. The inexpensive production is also associated with the achievement of excellent strength and wear properties.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
EP90914132A 1990-01-19 1990-09-28 Metallpulvermischung Expired - Lifetime EP0597832B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4001900A DE4001900A1 (de) 1990-01-19 1990-01-19 Metallpulvermischung
DE4001900 1990-01-19
PCT/DE1990/000751 WO1991010753A1 (de) 1990-01-19 1990-09-28 Metallpulvermischung

Publications (2)

Publication Number Publication Date
EP0597832A1 EP0597832A1 (de) 1994-05-25
EP0597832B1 true EP0597832B1 (de) 1995-06-28

Family

ID=6398606

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90914132A Expired - Lifetime EP0597832B1 (de) 1990-01-19 1990-09-28 Metallpulvermischung

Country Status (6)

Country Link
EP (1) EP0597832B1 (ja)
JP (1) JP2908018B2 (ja)
AT (1) ATE124467T1 (ja)
CA (1) CA2074193C (ja)
DE (2) DE4001900A1 (ja)
WO (1) WO1991010753A1 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE0203135D0 (sv) 2002-10-23 2002-10-23 Hoeganaes Ab Dimensional control

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1298614A (fr) * 1961-08-08 1962-07-13 Mannesmann Ag Procédé pour la fabrication de corps pressés frittés
DE1207634B (de) * 1961-11-30 1965-12-23 Birmingham Small Arms Co Ltd Pulvermischung zur Herstellung von Stahlgegenstaenden nach bekannten pulvermetallurgischen Verfahren
GB1162702A (en) * 1965-09-14 1969-08-27 Hoganas Billesholms Ab Low Alloy Iron Powder and process of preparing the same
GB1305608A (ja) * 1970-03-18 1973-02-07
US4170474A (en) * 1978-10-23 1979-10-09 Pitney-Bowes Powder metal composition
JPS6075501A (ja) * 1983-09-29 1985-04-27 Kawasaki Steel Corp 高強度焼結部品用の合金鋼粉

Also Published As

Publication number Publication date
DE59009358D1 (de) 1995-08-03
EP0597832A1 (de) 1994-05-25
CA2074193A1 (en) 1991-07-20
DE4001900A1 (de) 1991-07-25
WO1991010753A1 (de) 1991-07-25
ATE124467T1 (de) 1995-07-15
JP2908018B2 (ja) 1999-06-21
JPH05503318A (ja) 1993-06-03
CA2074193C (en) 2003-09-16

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