Classification and Typical Applications of Cemented Carbides

As the “teeth” of modern industry, cemented carbides—owing to their exceptional hardness, wear resistance, heat resistance, and chemical stability—play an irreplaceable role in fields such as machining, geological exploration, and aerospace. Their core composition is produced via powder metallurgy, combining refractory metal carbides (such as tungsten carbide and titanium carbide) with binder metals (cobalt and nickel). By fine-tuning the composition and processing parameters, a wide array of grades can be developed to meet the diverse demands of various applications.

I. Classification by Composition: The Four Major Systems Each Show Their Unique Strengths

The classification of cemented carbides is primarily based on the combination of carbide types and binder metals; currently, the mainstream approach divides them into four major systems:

1. Tungsten-cobalt type (YG type)

Composed primarily of tungsten carbide (WC) and cobalt (Co), with cobalt content typically ranging from 5% to 30%, these alloys exhibit excellent toughness and good thermal conductivity, though their heat resistance and wear resistance are relatively modest. Typical grades include YG6 (6% Co) and YG8 (8% Co), which are widely used for machining cast iron, nonferrous metals, and nonmetallic materials. For example, YG6X, containing a small amount of tantalum carbide (TaC), delivers high‑efficiency cutting performance when machining chilled cast iron and heat‑resistant steels, while YG8 is the material of choice for wire‑drawing dies, offering a service life more than 20 times that of high‑speed steel dies.

2. Tungsten-Titanium-Cobalt Grades (YT Grades)

Performance is enhanced by adding titanium carbide (TiC), forming a ternary WC–TiC–Co system. The incorporation of TiC raises the alloy’s hardness to 91–93 HRA and markedly improves red hardness, though at the expense of some toughness. A typical grade, such as YT15 (containing 15% TiC), is well suited for continuous cutting of steel and other ductile materials; its cutting speed exceeds that of YG‑type alloys by 40%, and tool life is extended threefold. In the machining of automotive engine cylinder blocks, YT‑type carbide tools enable high‑speed finish turning, achieving a surface roughness as low as Ra 0.8 μm.

3. Tungsten-Titanium-Tantalum (Niobium) Class (YW Class)

By incorporating tantalum carbide (TaC) or niobium carbide (NbC) into the YT‑type matrix, a quaternary WC–TiC–TaC(NbC)–Co system is formed. These alloys exhibit outstanding overall performance, with flexural strengths reaching 1350–1500 MPa, and are capable of machining steel, cast iron, and nonferrous metals simultaneously. The YW2 grade demonstrates excellent performance in stainless‑steel machining, offering 50% improved resistance to crescent‑shaped crater wear compared to YT‑type grades, making it a key tool material for machining difficult-to-cut materials in the aerospace sector.

4. Titanium Carbide-Based (YN-Type) Materials

Using titanium carbide (TiC) as the matrix and adding nickel (Ni) or molybdenum (Mo) as binders, a TiC–Ni/Mo system is formed. These alloys exhibit a hardness of up to 93 HRA and excellent heat resistance up to 1000°C, though they are relatively brittle. The YN05 grade is specifically designed for the continuous finishing of alloy steels and stainless steels, with cutting speeds reaching 200 m/min—three times that of conventional tools—and enabling micron‑level machining accuracy in precision mold manufacturing.

II. Classification by Application: Four Major Sectors Underpin Industrial Development

The applications of cemented carbides span the entire industrial value chain, with their classification emphasizing functional orientation:

1. Cutting Tools Field

Accounting for more than 35% of total cemented carbide production, these products encompass turning tools, milling cutters, drills, and more. In the CNC machine tool sector, solid cemented‑carbide drills can perform micro‑hole machining down to Φ0.1 mm, with dimensional accuracy maintained within ±0.002 mm. In PCB manufacturing, cemented‑carbide micro‑drills achieve high‑speed drilling of copper‑clad laminates at 300,000 rpm, delivering a service life exceeding 5,000 holes. Breakthroughs in coating technology have further expanded application horizons; for instance, Sandvik’s TiAlN‑coated tools increase tool life by a factor of five when machining high‑temperature alloys.

2. Geological and Mining Tools Sector

Accounting for 30% of total production, it is primarily used in impact tools such as rock‑drilling bits and coal‑cutting pick teeth. In deep‑mining operations, cemented carbide drill bits must withstand impact loads of up to 200 MPa, with wear resistance 50 times that of steel tools. In oil and gas drilling, cemented carbide teeth on roller‑cone bits can penetrate hard formations extending to depths of 6,000 meters, with a single tooth life of up to 200 hours.

3. Mold Manufacturing Field

Accounting for 20% of total output, these products encompass precision molds such as wire-drawing dies and cold-forging dies. In the wire and cable industry, cemented carbide wire-drawing dies can reduce the diameter of copper rods from Φ8 mm down to Φ0.01 mm, achieving a surface roughness as low as Ra 0.05 μm. In automotive component manufacturing, cemented carbide cold-forging dies can withstand pressures of up to 2,000 tons, with individual die lifetimes exceeding 500,000 parts.

4. Wear- and Corrosion-Resistant Components Field

This includes specialized components such as nozzles, seals, and top anvils. In synthetic diamond production, the cemented carbide top anvil used in six‑face press machines must withstand pressures of 10 GPa and temperatures as high as 1500°C, with its service life directly impacting the yield per batch. In the chemical industry, cemented carbide valve seats can resist severe corrosion from strong acids and alkalis, achieving a service life of over 10 years.

III. Technological Evolution: From Basic Materials to High-End Applications

The development of cemented carbides has always kept pace with advances in powder metallurgy. Ultrafine-grain technology—where grain sizes are less than 0.5 μm—has pushed alloy hardness beyond 94 HRA, enabling nanoscale machining in electronic chip fabrication. Gradient‑structure technology, achieved through compositional grading, yields a drill bit surface hardness of 95 HRA while maintaining a core toughness of 1,500 MPa, thereby reducing the risk of chipping during composite material machining. Moreover, the adoption of additive manufacturing has shortened the production cycle for complex‑shaped cemented carbide components by 70% and cut costs by 40%.

From the 1923 invention of WC–Co alloys by Germany’s Schlechter to today’s widespread use in high‑end applications such as aeroengine blade machining, deep‑sea drilling, and nuclear‑energy equipment manufacturing, the classification system and application scope of cemented carbides have continued to expand. With the convergence of intelligent manufacturing and advanced materials technologies, this “industrial tooth” is poised to evolve further—toward greater precision, enhanced performance, and an even broader range of uses.

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