EP 0322397 B1 19920122 - HIGH SPEED STEEL PREPARED BY POWDER METALLURGY, WEAR-RESISTANT PART PREPARED THEREBY AND PROCESS FOR ITS MANUFACTURE
Title (en)
HIGH SPEED STEEL PREPARED BY POWDER METALLURGY, WEAR-RESISTANT PART PREPARED THEREBY AND PROCESS FOR ITS MANUFACTURE
Publication
Application
Priority
AT 340187 A 19871223
Abstract (en)
[origin: US5021085A] The invention relates to high speed tool steels produced by powder metallurgy; to parts subject to heavy wear which are fabricated from such steel; and to a method of such fabrication. According to the invention, the part subject to heavy wear contains Nb in the amount of 2-15 wt. % and V in the amount of 1-4 wt. %, and further contains metal carbides in the amount of 10-30 vol. %; and that the lower limit of the carbon content is given by the formula Cmin=0.45+0.1(%Nb)+0.20(%V), and the upper limit of the carbon content is given by the formula Cmax=1.0+0.15(%Nb)+0.24(%V). In manufacturing the steel the melt of the alloying components is subjected to atomization in an overheated state (substantially above the liquidus temperature), to produce a powder.
IPC 1-7
IPC 8 full level
B22F 9/08 (2006.01); C21D 6/00 (2006.01); C22C 33/02 (2006.01); C22C 38/00 (2006.01); C22C 38/26 (2006.01)
CPC (source: EP US)
C21D 6/00 (2013.01 - EP US); C22C 33/0257 (2013.01 - EP US); C22C 33/0278 (2013.01 - EP US)
Designated contracting state (EPC)
BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0322397 A2 19890628; EP 0322397 A3 19891025; EP 0322397 B1 19920122; AT 391324 B 19900925; AT A340187 A 19900315; DE 3868038 D1 19920305; JP H01212736 A 19890825; US 5021085 A 19910604
DOCDB simple family (application)
EP 88890293 A 19881122; AT 340187 A 19871223; DE 3868038 T 19881122; JP 32228888 A 19881222; US 47613890 A 19900207