A steel roughing grade coated cemented carbide cutting tool comprises WC grains equal to or less than 70 w/o of the tool substrate, from about 5 to about 10 w/o of a cobalt bonding phase and the remainder being metal carbide grains selected from the group TiC, TaC, NbC, HfC and combinations thereof. The average WC grain size is from about 0.9 to about 1.3 microns and less than 10% of the WC grains have a size less than 0.5 microns. The coated cemented carbide tool is coated with an adherent refractory coating layer. The coated cemented carbide cutting tool for the steel roughing applications can be  machining steel at rough and heavy rough cutting conditions.

The new and improved coated cemented carbide cutting tool as previously described comprises the following steps:a steel work piece on a lathe is turned at an effective speed of up to about 275 surface feet per minute for rough cutting and up to about 130 surface feet per minute for heavy rough cutting. The new and improved coated cemented carbide cutting tool is moved across the surface of said steel work piece at a feed rate from about 0.01 to about 0.04 inches per revolution for rough cutting and from about 0.050 to about 0.080 inches per inches per revolution for heavy rough cutting. The steel workpiece is cut with the new and improved coated cemented carbide cutting tool to effect a depth of cut of about 0.125 to about 0.500 inches for rough cutting and about 0.150 to about 0.500 inches for heavy rough cutting.

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The results demonstrate that the conventional cemented carbide cutting tools in accordance with the carbide cutting tool powdered Cr3 C2 or WO3 have superior chipping resistance under high-cutting depth conditions of an end mill used in an intermittent cutting mode due to the presence of ultra-fine particles composed of a Co-based alloy having a particle diameter of 100 nm or less dispersed in a dispersing phase and due to a finer and more homogeneous distribution of the binding phase which is evaluated by a relatively low thermal conductivity. In contrast, the conventional cemented carbide cutting tools have relatively short service lives due to low chipping resistance, although the hardness, the Co and Cr contents, the rate of the dispersing phase, and the average particle diameter are substantially the same as those in the cemented carbide cutting tools of the present invention.

As described above, the cemented carbide cutting tool powdered Cr3 C2 or WO3 has high chipping resistance and has superior cutting characteristics without chipping of the cutting edge for long periods under intermittent heavy cutting conditions such as at a high feed rate or a high cutting depth, in addition to continuous cutting conditions. Thus, the tool satisfactorily contributes to labor and energy saving in cutting operations.

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A cemented carbide cutting tool made of a tungsten carbide-based alloy having high chipping resistance comprising:

8 to 13 percent by weight of Co and 0.1 to 3 percent by weight of Cr as constituents for forming a binding phase, the balance being tungstencarbide as a constituent for forming a dispersing phase and incidental impurities, the rate of the dispersing phase to the total of the dispersing phase and the binding phase being in a range of 72 to 90 percent by area and the average particle diameter being 1 μm or less according to measurement of an electron microscopic texture; wherein the dispersing phase of the cemented carbide cutting tool made of a tungsten carbide-based alloy comprises a dispersing phase composed of ultra-fine particles dispersed in a matrix and having a particle diameter of 100 nm or less, and the ultra-fine particles comprise a Co based alloy.

The Co content is limited to 8 to 13 percent by weight in the cemented carbide alloy constituting the cemented carbide cutting tool of the present invention, because sufficient toughness is not achieved at a content of less than 8 percent by weight whereas abrasion resistance steeply decreases at a content of higher than 13 percent by weight.


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A cemented carbide cutting tool made of a tungsten carbide-based alloy comprising:

A dispersing phase comprising tungsten carbide having an average particle diameter of 1 μm or less,a binding phase comprising Co and Cr,and ultra-fine particles comprising a Co alloy having a particle diameter of 100 nm or less,wherein the dispersing phase is 72 to 90 percent by area of a cross section of the cemented carbide cutting tool; the ultra-fine particles are dispersed inside the tungsten carbide; and the cemented carbide cutting tool contains 8 to 13 percent by weight of Co, 0.1 to 3 percent by weight of Cr, the balance being tungsten carbide and incidental impurities.

And more specifically, relates to a cemented carbide cutting tool having a sharp cutting edge and maintaining high cutting characteristics for long service life when used as an end mill having an intermittent cutting mode and when cutting is performed under heavy cutting conditions such as at high feed rate and high cutting depth.


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A coated cemented carbide alloy, excellent in toughness as well as wear resistance and which is used for cutting tools and wear resistance tools is provided herein,

A coated cemented carbide alloy, excellent in toughness as well as wear resistance and which is used for cutting tools and wear resistance tools is provided herein. This coated cemented carbide alloy is composed of a cemented carbide substrate consisting of a hard phase of at least one member selected from carbides, nitrides and carbonitrides of Group IVb, Vb and VIb metals of the Periodic Table and a binder phase consisting of at least one member selected from the iron group metals, and a monolayer or multilayer, provided on the substrate consisting of at least one member selected from carbides, nitrides, oxides and borides of Group IVb, Vb and VIb metals of Periodic Table, solid solutions thereof and aluminum oxide, and wherein a binder phase-enriched layer is provided in a space 0.01 mm and 2 mm below the surface of the substrate with A-type and/or B-type pores inside the binder phase-enriched layer.


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Present in the world, WC-based tungsten carbide cutting tools are widely used. In recent years, some new varieties of tungsten carbide cutting tools have appeared, such as carbon (nitrogen) titanium-based tungsten carbide cutting tools, ultra-fine grain tungsten carbide cutting tools, tungsten carbide coating tools etc. We mainly introduce here carbon (nitrogen) titanium-based tungsten carbide cutting tools.

Carbon (nitrogen) titanium-based tungsten carbide cutting tools is a new type of tungsten carbide cutting tools, it has high hardness, good oxidation resistance, heat resistance, low wear characteristics and wear resistance and high-speed cutting steel material time .  Carbon (nitrogen) titanium-based alloy tool widely used in manufacturing high-speed finishing tool material  which fills in the blanks of WC-based tungsten carbide cutting tools and ceramic tool materials.

Carbon (nitrogen) titanium-based tungsten carbide cutting tools compared to ceramic tool materials, far more than its toughness cermet (TiC base and TiCN based alloy), and are close to the metal ceramic hardness and heat resistance.

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Harms of tungsten carbide cutting tools WC leaching reflects on bad influernce on tungsten carbide cutting tools, tungsten resources, humans and the environment. Embodied in the following three aspects:
1. Influence on tungsten carbide cutting tools. In tungsten carbide cutting tools, WC is a hard phase of it. Tungsten carbide cutting tools WC leaching will reduce hardness and wear resistance, but also lead to loss of cobalt binder, thereby decreases hardness and strength of tungsten carbide  cutting tools and dramatically shorten tools life. The impact of shortened tools life, on the one hand will bring an increase in the number of tool changes, reducing production efficiency; on the other hand will lead to increased manufacturing costs.

2. Influence on tungsten resources. Tungsten carbide cutting tools will lead to leaching of waste tungsten resources, is not conducive to the sustainable development of tungsten resources.

3. Influence on humans and the environment. Tungsten carbide cutting tools WC leaching will easily make operations workers contracted asthma, pulmonary fibrosis and allergic dermatitis and other diseases, On the other hand, Tungsten carbide cutting tools WC leaching into the cutting fluid,will cause serious environmental pollution.

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