YG8C
ISO K30
YG8C is a coarse-grain straight tungsten carbide–cobalt cermet, nominally WC with an 8 % Co binder and no cubic carbide additions, offered as-sintered (SINT), sinter-HIP (HIP) or in extra-coarse grain (XC).
Reference datasheet — YG8C 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 SINT condition
YG8C tempers and conditions
YG8C is supplied in 3 conditions, soft to hard. SINT 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 |
|---|---|---|---|---|---|---|
Extra-coarse grain (>5 µm) rock-tool version | Pick the extra-coarse grain (>5 µm) rock-tool version for drill bits and TBM cutter teeth under heavy impact and thermal fatigue; toughness is highest but hardness and wear resistance drop. | 1,050 | 0 | 1,120 HV | 90 W/m·K | |
SINTDefault Sintered | Use the conventional vacuum liquid-phase sintered blank or rod as the cost-effective default for general heavy cutting and wear components with 2.5–5 µm coarse grain. | 1,100 | 0 | 1,220 HV | 80 W/m·K | |
Hot isostatic pressed | Choose sinter-HIP densification when impact loading is high and chipping resistance plus fatigue life govern; porosity is near zero and transverse rupture strength is highest. | 1,250 | 0 | 1,250 HV | 82 W/m·K |
What is YG8C?
YG8C is a coarse-grain straight tungsten carbide–cobalt cermet, nominally WC with an 8 % Co binder and no cubic carbide additions, offered as-sintered (SINT), sinter-HIP (HIP) or in extra-coarse grain (XC). The coarse grain trades some hardness for impact toughness and thermal-shock resistance, which is why it is specified for heavy roughing, mining bits and cold-work tooling supplied as pressed blanks, rods, buttons and brazed tips. Thermal conductivity is about 80 W/m·K and service temperature is capped near 600 °C; the cobalt binder limits acid corrosion resistance and all post-sinter shaping is by diamond grinding or EDM (machinability score 3). Choose a fine-grain WC–8Co grade when abrasive wear, not impact, dominates. YG8C 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). YG8C has a tensile strength of 1,100 MPa (160 ksi), stronger than 88% of ceramic grades. Elongation at break is 0% and the elastic modulus is 600 GPa (87 Msi).
What is YG8C used for?
- heavy roughing
- mining bits
- impact wear parts
- cold heading dies
Advantages
- Tough — resists crack growth — 15 MPa·√m (13.7 ksi·√in), better than 98% 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
- Conducts heat well — 80 W/m·K (46.2 BTU/hr·ft·°F), better than 77% 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
- High embodied carbon — 25 kg CO₂/kg, worse than 78% of ceramic grades
YG8C properties
Typical room-temperature values for YG8C-SINT; bars are the position among ceramic grades.
Physical3
YG8C 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
YG8C has a tensile strength of 1,100 MPa (160 ksi), stronger than 88% of ceramic grades. Elongation at break is 0% and the elastic modulus is 600 GPa (87 Msi).
Thermal5
YG8C is rated for continuous service to 600°C (1,112 °F). It conducts heat at 80 W/m·K (46.2 BTU/hr·ft·°F), better than 77% of ceramic grades. Thermal expansion is 5.2 µm/m·K (2.89 µin/in·°F).
Electrical2
YG8C 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 YG8C takes about 320 MJ of energy and emits 25 kg of CO₂ — more than 78% of ceramic grades. Typical recycled content is 30%.
Manufacturability3
YG8C's machinability is not recommended (3/100, worse than 95% 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. YG8C is highlighted; hover a dot for its name, or open the interactive family chart.
Working with YG8C
Is YG8C easy to machine?
After sintering, only diamond wheel grinding, EDM (wire or sinker) or laser processing is possible; conventional cutting will not work. Green or pre-sintered blanks can be turned and milled with carbide tooling before final sintering.
Can YG8C be welded?
Not fusion weldable. Join to steel bodies by copper- or silver-based brazing (for example BAg-40Cu-Zn at 700–900 °C, with a copper foil interlayer to reduce residual stress) or by vacuum brazing.
Can YG8C be formed, bent or molded?
Powder-metallurgy route only: die pressing, extrusion or injection moulding followed by liquid-phase sintering at 1380–1460 °C, optionally with 6 MPa sinter-HIP. Linear sintering shrinkage is about 18–22 %, so tooling must be oversized by the shrinkage factor.
YG8C 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 | 7.5 – 8.5 | 8 |
| TaC+NbCoptional additive for grain and property adjustment | 0 – 0.5 | 0.2 |
| Ctotal carbon; kept in two-phase field to avoid η phase/free C | 5.5 – 5.9 | 5.7 |
| WCcoarse grain, mean grain size 2.5–5 µm | balance |
What surface finishes work on YG8C?
Diamond lapping and polishing reach a mirror finish of Ra <0.05 µm. PVD TiN/TiAlN or CVD coatings can be applied for wear resistance, but coarse-grain substrates used in impact duty are often left uncoated.
Equivalent designations
Standards and trade names that resolve to YG8C in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ISO
- K30
How much does YG8C cost?
YG8C is a high-cost ceramic ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
YG8C — frequently asked
What is YG8C used for?
YG8C is typically used for heavy roughing, mining bits, impact wear parts and cold heading dies. In short: coarse-grain impact grade; tough WC-8Co variant; for interrupted cuts.
What is the tensile strength of YG8C?
YG8C has a typical tensile strength of 1,100 MPa (160 ksi) — stronger than 88% of ceramic grades. Strength varies by condition: see the 3 listed tempers.
Is YG8C easy to machine?
Not especially — machinability is rated not recommended (3/100, worse than 95% of ceramic grades). After sintering, only diamond wheel grinding, EDM (wire or sinker) or laser processing is possible; conventional cutting will not work. Green or pre-sintered blanks can be turned and milled with carbide tooling before final sintering.
Can YG8C be welded?
Not fusion weldable. Join to steel bodies by copper- or silver-based brazing (for example BAg-40Cu-Zn at 700–900 °C, with a copper foil interlayer to reduce residual stress) or by vacuum brazing.
What surface finishes work on YG8C?
Diamond lapping and polishing reach a mirror finish of Ra <0.05 µm. PVD TiN/TiAlN or CVD coatings can be applied for wear resistance, but coarse-grain substrates used in impact duty are often left uncoated.
Can YG8C be formed, bent or molded?
Powder-metallurgy route only: die pressing, extrusion or injection moulding followed by liquid-phase sintering at 1380–1460 °C, optionally with 6 MPa sinter-HIP. Linear sintering shrinkage is about 18–22 %, so tooling must be oversized by the shrinkage factor.
What is the maximum service temperature of YG8C?
YG8C is rated for continuous use to about 600°C (1,112 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does YG8C cost?
YG8C is a high-cost ceramic ($$$$), 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
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (Cemented Carbides) — ASM International (1990)
- Cemented Carbide Grade Data (WC-Co straight grades) — Sandvik Hard Materials / (2022)
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.