YG8
AISI/SAE C1 · ISO K20
YG8 (C1) is a straight WC–8% Co cemented carbide at the tough end of the YG (ISO K) series, with 600 GPa elastic modulus and 75 W/m·K thermal conductivity, supplied in MG, C and N conditions.
Reference datasheet — YG8 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the MG condition
YG8 tempers and conditions
YG8 is supplied in 3 conditions, soft to hard. MG is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
MGDefault Medium grain (1.5–3 µm WC), standard YG8, sinter-HIP | Default balanced grade for general roughing, dies and wear parts (ISO K20–K30). | 1,200 | 0.1 | 1,350 HV | 75 W/m·K | |
Coarse grain (3–6 µm WC), YG8C, maximum toughness | Pick for heavy impact and thermal shock: mining/rock bits, snowplough blades, hot rolls. | 1,300 | 0.15 | 1,180 HV | 85 W/m·K | |
Normalized | Pick when a sharp, wear-resistant edge is needed at 8 % Co toughness — micro-drills, PCB tooling, precision punches. | 1,500 | 0.1 | 1,550 HV | 68 W/m·K |
What is YG8?
YG8 (C1) is a straight WC–8% Co cemented carbide at the tough end of the YG (ISO K) series, with 600 GPa elastic modulus and 75 W/m·K thermal conductivity, supplied in MG, C and N conditions. The higher cobalt content trades hardness for impact resistance, so it is used for roughing cast iron and non-ferrous metals, mining and rock tools, stamping dies and general wear parts. Service temperature is limited to about 600 °C, corrosion resistance is the lowest in this group because of the larger cobalt binder fraction, and sintered parts can only be diamond ground or EDM'd. Use YG6 when edge wear rather than chipping controls tool life. YG8 has a density of 14.7 g/cm³ (0.531 lb/in³), heavier than 93% of ceramic grades. It melts at 1,320°C (2,408 °F). YG8 has a tensile strength of 1,200 MPa (174 ksi), stronger than 94% of ceramic grades. Elongation at break is 0.1% and the elastic modulus is 600 GPa (87 Msi).
What is YG8 used for?
- roughing cast iron
- mining/rock tools
- stamping dies
- wear liners
Advantages
- Tough — resists crack growth — 14 MPa·√m (12.7 ksi·√in), better than 96% of ceramic grades
- Stiff — 600 GPa (87 Msi), better than 91% of ceramic grades
- Polishes to a fine finish — 90/100, better than 78% of ceramic grades
Limitations
- Heavy — 14.7 g/cm³ (0.531 lb/in³), worse than 93% of ceramic grades
- Needs corrosion protection — 45/100, worse than 90% of ceramic grades
YG8 properties
Typical room-temperature values for YG8-MG; bars are the position among ceramic grades.
Physical3
YG8 has a density of 14.7 g/cm³ (0.531 lb/in³), heavier than 93% of ceramic grades. It melts at 1,320°C (2,408 °F).
Mechanical13
YG8 has a tensile strength of 1,200 MPa (174 ksi), stronger than 94% of ceramic grades. Elongation at break is 0.1% and the elastic modulus is 600 GPa (87 Msi).
Thermal5
YG8 is rated for continuous service to 600°C (1,112 °F). It conducts heat at 75 W/m·K (43.3 BTU/hr·ft·°F), better than 73% of ceramic grades. Thermal expansion is 4.8 µm/m·K (2.67 µin/in·°F).
Electrical2
YG8 has an electrical resistivity of 2×10⁻⁷ Ω·m.
Chemical & Environmental2
Corrosion resistance is fair (45/100), worse than 90% of ceramic grades.
Sustainability4
Producing a kilogram of YG8 takes about 180 MJ of energy and emits 12 kg of CO₂ — more than 60% of ceramic grades. Typical recycled content is 30%.
Manufacturability3
YG8's machinability is not recommended (5/100, worse than 59% of ceramic grades).
Common Calculations4
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the ceramic family
Yield strength against density for every ceramic grade FabDigit runs. YG8 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with YG8
Is YG8 easy to machine?
Only diamond grinding, wire/sinker EDM (it is electrically conductive) or laser; green-state pressed blanks can be soft-machined before sintering.
Can YG8 be welded?
Not fusion weldable — join by vacuum/induction brazing with Ag-Cu-Zn or Cu-Mn fillers, using a ductile shim to absorb the CTE mismatch with steel.
Can YG8 be formed, bent or molded?
Made by pressing or extruding WC+Co powder and liquid-phase sinter-HIP at ~1400–1450 °C; allow ~18–20 % linear shrinkage and never plastically form the sintered part.
YG8 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 |
|---|---|---|
| Cometallic binder phase | 7.5 – 8.5 | 8 |
| TaC+NbCoptional grain-growth inhibitor in some producers' YG8 | 0 – 0.5 | 0.2 |
| Ctotal carbon, must stay in two-phase window (no eta phase, no free graphite) | 5.5 – 5.9 | 5.7 |
| WCbalance, tungsten carbide hard phase | balance |
What surface finishes work on YG8?
Diamond lapping/polishing gives mirror finishes; PVD TiN/TiAlN or CVD coatings, and micro-blasting for edge prep, are the usual surface treatments.
Equivalent designations
Standards and trade names that resolve to YG8 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- AISI / SAE
- C1
- ISO
- K20
How much does YG8 cost?
YG8 is a high-cost ceramic ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
YG8 — frequently asked
What is YG8 used for?
YG8 is typically used for roughing cast iron, mining/rock tools, stamping dies and wear liners. In short: toughest straight WC-Co grade; roughing and impact duty; lower hardness than YG6.
What is the tensile strength of YG8?
YG8 has a typical tensile strength of 1,200 MPa (174 ksi) — stronger than 94% of ceramic grades. Strength varies by condition: see the 3 listed tempers.
Is YG8 easy to machine?
Not especially — machinability is rated not recommended (5/100, worse than 59% of ceramic grades). Only diamond grinding, wire/sinker EDM (it is electrically conductive) or laser; green-state pressed blanks can be soft-machined before sintering.
Can YG8 be welded?
Not fusion weldable — join by vacuum/induction brazing with Ag-Cu-Zn or Cu-Mn fillers, using a ductile shim to absorb the CTE mismatch with steel.
What surface finishes work on YG8?
Diamond lapping/polishing gives mirror finishes; PVD TiN/TiAlN or CVD coatings, and micro-blasting for edge prep, are the usual surface treatments.
Can YG8 be formed, bent or molded?
Made by pressing or extruding WC+Co powder and liquid-phase sinter-HIP at ~1400–1450 °C; allow ~18–20 % linear shrinkage and never plastically form the sintered part.
What is the maximum service temperature of YG8?
YG8 is rated for continuous use to about 600°C (1,112 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does YG8 cost?
YG8 is a high-cost ceramic ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ISO 513 Classification and application of hard cutting materials — ISO (2012)
- ISO 28079 Hardmetals — Palmqvist toughness test — ISO (2009)
- ASM Engineered Materials Handbook Vol.4 — Ceramics and Glasses / Cemented Carbides — ASM International (1991)
- Cemented carbide grade data (WC-8Co K20/K30 class) — Zhuzhou Cemented Carbide / Sandvik Hard Materials (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.