Cemented Carbide WC-Co K10
ISO K10 cemented tungsten carbide with ~6% cobalt binder. The hardest standard WC-Co grade (92–93 HRA, ~1600 HV) with highest wear resistance but lowest toughness. Density ~14.9 g/cm³, TRS 1800–2200 MPa, elastic modulus ~620 GPa. Fine to submicron grain. Applications: finish turning and boring of cast iron, non-ferrous metals, hardened steel; PCB drilling; wire drawing dies; seal rings; wear parts with no impact. ANSI C2/C3, China YG6.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| ISO | INT | K10 | — | % | |
| 🇺🇸 | ANSI | USA | C2/C3 | — | % |
| 🇨🇳 | China/GB | China | YG6 | — | % |
| 🇺🇸 | Kennametal | USA | KFF05/KFS06 | — | % |
| 🇸🇪 | Sandvik | Sweden | H10F | — | % |
| Ceratizit | AT | MG12 | — | % |
Sources: ISO 513, ANSI B212.12, GB/T 2075, kennametal.com, sandvik.coromant.com, ceratizit.com
Mechanical properties — Pro
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Cemented Carbide WC-Co K20
ISO K20 cemented tungsten carbide with ~8% cobalt binder. The most widely used general-purpose WC-Co grade, balancing wear resistance and toughness. Hardness 91–92 HRA (~1450–1550 HV), density ~14.7 g/cm³, TRS 2200–2600 MPa. Medium grain. Applications: general turning, milling, drilling of cast iron, non-ferrous metals; end mills; wear parts with light impact; mining bits. ANSI C2, China YG8.
Cemented Carbide WC-Co K40
ISO K40 cemented tungsten carbide with ~15% cobalt binder. Toughest standard WC-Co grade with highest impact resistance but lowest hardness. Hardness 89–90 HRA (~1200–1350 HV), density ~14.0 g/cm³, TRS 2800–3400 MPa. Coarse grain. Applications: heavy roughing of cast iron; cold heading dies; mining and rock drilling; punches and stamping tools; percussion bits; parts subject to heavy impact. ANSI C1/C11, China YG15.
Cemented Carbide WC-TiC-Co P20
ISO P20 cemented carbide with WC + TiC/TaC + Co. Designed for machining steel and steel castings. TiC addition provides crater wear resistance essential for steel cutting. Hardness 91–92 HRA, density ~12.0–13.0 g/cm³ (lower than K-grades due to TiC), TRS 1800–2200 MPa. Applications: general turning, milling, planing of carbon steel, alloy steel, tool steel, ferritic and martensitic stainless steel. ANSI C6, China YT15.
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