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US4263046A Expired / Lapsed US ⏱️ 0.0 years remaining

Sinterable mass for producing workpieces of alloy steel

Assignee: GfE Gesellschaft fuer Elektrometallurgie mbH
•
Filing: 1978-09-26
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Granted: 1981-04-21
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Expires: 1998-09-26
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Abstract

Abstract A workpiece of alloy steel is produced by sintering under a nonoxidizing atmosphere a mass of malleable-iron powder admixed with a comminuted complex ferroalloy. The latter, obtained from a molten mixture of several simple high-carbon ferroalloys saturated with graphite, is a blend of at least three nonferrous metals and iron in carbide form, including a complex carbide of formula M 7 C 3 containing iron and manganese with the possible addition of chromium and another carbide of formula M' 2 C/M'C containing molybdenum with the possible addition of vanadium and/or niobium. The carbidically bound carbon amounts to at least 4%, by weight, of the ferroalloy composition and may constitute between 10% and 60% of the carbon of the sinterable powder mixture to which elemental carbon may be added as graphite. As the mass of iron and ferroalloy particles compacted under high pressure is sintered at temperatures between about 1150° and 1300° C., the carbides lose their identity as their metals diffuse into the soft iron along with the carbon.

Inventors

  • 👤 Rudolf Fichte
  • 👤 Hans-Joachim Retelsdorf
  • 👤 Richard Jervis
  • 👤 Gunter Radel

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 22:57
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/16; G06G7/163; C; C22; C22C; C22C33/00; C22C33/02; C22C33/0207

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 167 words
A sinterable mass to be used in the manufacture of workpieces of alloy steel, said mass being essentially composed of a major proportion of malleable-iron powder, a minor proportion of comminuted complex ferroalloy compositions highly resistant to oxidation at temperatures up to at least 1200° C., said minor proportion ranging between substantially 0.5% and 5% by weight of said mass, and about 0.2 to 0.6 weight-percent elemental carbon; said ferroalloy composition consisting essentially of a powdered solid blend, with a particle size below 10 microns, of carbides of iron, manganese, molybdenum and at least one further nonferrous metal plus a residual phase consisting mainly of iron, said further nonferrous metal being selected from the group which consist of chromium, vanadium and niobium, said carbides including a complex carbide of the formula M 7 C 3 wherein M is a combination of iron with either manganese or chromium plus manganese, the carbon carbidically bound in said ferroalloy composition amounting to at least 4% by weight of said composition.
Claim 2
Dependent Claim 167 words
A sinterable mass to be used in the manufacture of workpieces of alloy steel, said mass being essentially composed of a major proportion of malleable-iron powder, a minor proportion of comminuted complex ferroalloy compositions highly resistant to oxidation at temperatures up to at least 1200° C., said minor proportion ranging between substantially 0.5% and 5% by weight of said mass, and about 0.2 to 0.6 weight-percent elemental carbon; said ferroalloy composition consisting essentially of a powdered solid blend, with a particle size below 10 microns, of carbides of iron, manganese, molybdenum and at least one further nonferrous metal plus a residual phase consisting mainly of iron, said further nonferrous metal being selected from the group which consist of chromium, vanadium and niobium, said carbides including a complex carbide of the formula M 7 C 3 wherein M is a combination of iron with either manganese or chromium plus manganese, the carbon carbidically bound in said ferroalloy composition amounting to at least 4% by weight of said composition.
Claim 3
Dependent Claim 32 words
A sinterable mass as defined in claim 1 wherein said ferroalloy composition consists essentially, in percent by weight, of 20-25% Mn 20-25% Cr 20-25% Mo 6-8% C balance iron and metallurgical impurities.
Claim 4
Dependent Claim 48 words
A sinterable mass as defined in claim 1 wherein said ferroalloy composition consists essentially, in percent by weight, of 20-25% Mo 20≧25% of at least one metal selected from the group which consists of Va and Nb 20-25% Mn up to 7% C balance iron and metallurgical impurities.

References Cited (Backward Citations)

US3746518A Cited
US3655365A Cited
US3982924A Cited
DE2444727A1 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-04-20 1984-10-20 1985-04-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-04-20 1988-10-20 1989-04-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-04-20 1992-10-20 1993-04-21 $7700.00 Window Closed / Lapsed

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