YG6X UF (Ultrafine / submicron grain)
Grade
ISO K05
Pick for micro-tools, PCB drills and razor-sharp finishing edges needing the highest hardness at 6% Co; least tolerant of impact.
Values for the UF condition
Other YG6X tempers and conditions
YG6X is listed in 3 conditions; see the grade overview at YG6X.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Sinter-HIP consolidated | Choose when maximum transverse rupture strength and freedom from A/B-type porosity are needed, e.g. thin cutting edges, punches and micro-drill blanks. | — | 1,500 | 0 | 1,780 HV | 80 W/m·K |
FGDefault Fine grain (0.8–1.2 µm WC), vacuum sintered | Standard commercial YG6X: general finishing tooling and wear parts where edge sharpness matters more than impact toughness. | — | — | — | 1,750 HV | 79 W/m·K |
UFThis page Ultrafine / submicron grain | Pick for micro-tools, PCB drills and razor-sharp finishing edges needing the highest hardness at 6% Co; least tolerant of impact. | — | — | — | 1,950 HV | 70 W/m·K |
What is YG6X UF?
YG6X UF is YG6X in the UF grade — pick for micro-tools, PCB drills and razor-sharp finishing edges needing the highest hardness at 6% Co; least tolerant of impact. The elastic modulus is 620 GPa (89.9 Msi). YG6X UF has a density of 14.9 g/cm³ (0.538 lb/in³), heavier than 96% of ceramic grades. FG is the default condition FabDigit quotes; UF is available on request or by drawing note.
Advantages
- Stiff — 620 GPa (89.9 Msi), better than 93% of ceramic grades
- Polishes to a fine finish — 92/100, better than 89% of ceramic grades
- Tough — resists crack growth — 8 MPa·√m (7.28 ksi·√in), better than 77% of ceramic grades
Limitations
- Heavy — 14.9 g/cm³ (0.538 lb/in³), worse than 96% of ceramic grades
- Needs corrosion protection — 55/100, worse than 77% of ceramic grades
YG6X UF properties
Typical room-temperature values for YG6X UF; 10 are specific to this condition. Other listed values are YG6X reference data and may not represent this condition. Bars are the position among ceramic grades.
Physical2
YG6X UF has a density of 14.9 g/cm³ (0.538 lb/in³), heavier than 96% of ceramic grades.
Mechanical9
The elastic modulus is 620 GPa (89.9 Msi).
Thermal5
YG6X UF is rated for continuous service to 750°C (1,382 °F). It conducts heat at 70 W/m·K (40.4 BTU/hr·ft·°F), better than 70% of ceramic grades. Thermal expansion is 4.7 µm/m·K (2.61 µin/in·°F).
Electrical2
YG6X UF has an electrical resistivity of 2×10⁻⁷ Ω·m.
Chemical & Environmental2
Corrosion resistance is good (55/100), worse than 77% of ceramic grades.
Sustainability4
Producing a kilogram of YG6X UF takes about 300 MJ of energy and emits 22 kg of CO₂ — more than 74% of ceramic grades. Typical recycled content is 30%.
Manufacturability3
YG6X UF's machinability is not recommended (4/100, worse than 85% of ceramic grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with YG6X UF
Is YG6X easy to machine?
Green-state pressing/extrusion then diamond grinding, wire/sinker EDM or laser after sintering — no conventional cutting; keep grinding wheels cool to avoid edge micro-cracks.
Can YG6X be welded?
Not fusion weldable; join to steel by silver/Cu-based vacuum brazing (e.g. BAg-24, 700–900 °C) with a shim to absorb the CTE mismatch, or by braze-clad shrink fit.
Can YG6X be formed, bent or molded?
Net-shape by uniaxial die pressing, CIP or extrusion of PEG-bonded powder, dewaxed and vacuum/sinter-HIP fired at ~1400–1450 °C with ~18–20% linear shrinkage.
What surface finishes work on YG6X?
Diamond lapping/polishing to Ra<0.05 µm; PVD TiAlN/AlTiN or CVD TiCN-Al2O3 coating after Co-etch pretreatment; do not electroplate acidic baths that leach cobalt.
YG6X chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Cobinder phase | 5.5 – 6.5 | 6 |
| VCgrain-growth inhibitor | 0.1 – 0.5 | 0.3 |
| TaCgrain refiner / thermal-shock aid; NbC may substitute | 0 – 0.6 | 0.3 |
| Cr3C2optional inhibitor, some producers | 0 – 0.4 | 0.2 |
| WCfine-grain tungsten carbide, 0.8–1.2 µm | balance | — |
YG6X UF — frequently asked
What is YG6X UF used for?
YG6X UF is typically used for finish machining cast iron, reamers, small-diameter drills and precision cutting edges. In short: fine-grain finishing grade; sharper, more wear-resistant than YG6; higher rated temperature.
Is YG6X UF easy to machine?
Not especially — machinability is rated not recommended (4/100, worse than 85% of ceramic grades). Green-state pressing/extrusion then diamond grinding, wire/sinker EDM or laser after sintering — no conventional cutting; keep grinding wheels cool to avoid edge micro-cracks.
Can YG6X UF be welded?
Not fusion weldable; join to steel by silver/Cu-based vacuum brazing (e.g. BAg-24, 700–900 °C) with a shim to absorb the CTE mismatch, or by braze-clad shrink fit.
What surface finishes work on YG6X UF?
Diamond lapping/polishing to Ra<0.05 µm; PVD TiAlN/AlTiN or CVD TiCN-Al2O3 coating after Co-etch pretreatment; do not electroplate acidic baths that leach cobalt.
Can YG6X UF be formed, bent or molded?
Net-shape by uniaxial die pressing, CIP or extrusion of PEG-bonded powder, dewaxed and vacuum/sinter-HIP fired at ~1400–1450 °C with ~18–20% linear shrinkage.
What is the maximum service temperature of YG6X UF?
YG6X UF is rated for continuous use to about 750°C (1,382 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- ISO 513 Classification and application of hard cutting materials — ISO (2012)
- ASM Handbook Vol. 2 / Engineered Materials Handbook Vol. 4 — Cemented Carbides — ASM International (1991)
- Cemented carbide grade tables (WC-6Co fine grain) — Zhuzhou Cemented Carbide / Xiamen Golden Egret / Sandvik Hard Materials (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.