(19)
(11) EP 1 043 416 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
14.08.2002 Bulletin 2002/33

(43) Date of publication A2:
11.10.2000 Bulletin 2000/41

(21) Application number: 00106692.7

(22) Date of filing: 29.03.2000
(51) International Patent Classification (IPC)7: C22C 29/08, C22C 30/00
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 08.04.1999 SE 9901243

(71) Applicant: SANDVIK AKTIEBOLAG
811 81 Sandviken (SE)

(72) Inventors:
  • Lenander, Anders
    135 53 Tyresö (SE)
  • Lindholm, Mikael
    126 36 Hägersten (SE)

(74) Representative: Taquist, Lennart et al
Sandvik AB Patent Department
811 81 SANDVIKEN
811 81 SANDVIKEN (SE)

   


(54) Cemented carbide insert


(57) The present invention relates to a cutting tool insert for machining of steel comprising a cemented carbide body and a coating. The cemented carbide body comprises WC, 5-12 wt-% Co and 3-11 wt-% of cubic carbides of metals Ta, Ti and W. The amount of Nb is below 0.1 wt-% and the ratio Ta/Ti is 1,0-4,0. The Co-binder phase is highly alloyed with W with a CW-ratio of 0,75-0,95 and, finally, the cemented carbide body has a binder phase enriched and essentially gamma phase free surface zone of a thickness of 5-50 µm.






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