US RE40,026 E1
Cemented carbide insert for turning, milling and drilling
Mats Waldenstrom, Bromma (Sweden); Ake Ostlund, Hagersten (Sweden); and Ove Alm, Hägersten (Sweden)
Assigned to Sandvik Intellectual Property AB, Sandviken (Sweden)
Appl. No. 11/449,008
PCT Filed Jul. 08, 1997, PCT No. PCT/SE97/01243
§ 371(c)(1), (2), (4) Date Apr. 20, 1999,
PCT Pub. No. WO98/03691, PCT Pub. Date Jan. 29, 1998.
Application 11/449008 is a reissue of application No. 09/214923, filed on Apr. 20, 1999, now 6,221,479, filed on Apr. 24, 2001.
Claims priority of application No. 9602811 (SE), filed on Jul. 19, 1996.
Int. Cl. C04B 35/56 (2006.01)
U.S. Cl. 428—325  [428/323; 428/697; 428/698; 428/701; 428/702; 51/307; 51/309] 10 Claims
OG exemplary drawing
 
1. A cemented carbide insert provided with a thin wear resistant coating with excellent properties for machining of steels and stainless steels comprising WC, 5-12.5 wt-% Co and 0-10 wt-% cubic carbides such as TiC, TaC, NbC or mixtures thereof wherein the WC-grains have an average grain size in the range 1.0-3.0 μm the WC grains have a narrow grain size distribution in the range 0.5-4.5 μm the W-content in the binder phase expressed as the “CW-ratio” defined as
CW-ratio=Ms/wt%Co*0.0161

OG Complex Work Unit Drawing
where Ms is the measured saturation magnetization of the sintered cemented carbide insert in kA/m [ hAm2/kg ] and wt % Co is the weight percentage of Co in the cemented carbide, is 0.86-0.96.