Cobalt-Chrome Alloy Stellite 6B Aged
Heat-treated state
UNS R30016
Aged = solution treated + precipitation aged
Choose when maximum hardness and abrasive wear life matter more than impact toughness or ductility.
Values for the Aged condition
Other Stellite 6B tempers and conditions
Stellite 6B is listed in 3 conditions; see the grade overview at Stellite 6B.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
SADefault Solution heat treated (mill annealed), plate/bar per AMS 5894 | Standard stocked condition: best combination of toughness and wear resistance for valve seats, wear rings and bushings. | 620 | 1,000 | 8 | 38 HRC | — |
Hot rolled | Thicker plate and bar stock for machined seat rings and wear pads where a mill-finish surface is acceptable. | 630 | 1,000 | 7 | 39 HRC | 1.9 % IACS |
AgedThis page Solution treated + precipitation aged | Choose when maximum hardness and abrasive wear life matter more than impact toughness or ductility. | 740 | 1,100 | 3 | 45 HRC | 2 % IACS |
What is Stellite 6B Aged?
Stellite 6B Aged is Stellite 6B heat treated to Aged — choose when maximum hardness and abrasive wear life matter more than impact toughness or ductility. Stellite 6B Aged has a yield strength of 740 MPa (107 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 81% of cobalt-chrome alloy grades. Elongation at break is 3% and the elastic modulus is 232 GPa (33.6 Msi). Stellite 6B Aged has a density of 8.38 g/cm³ (0.303 lb/in³), lighter than 61% of cobalt-chrome alloy grades. It melts at 1,265°C (2,309 °F). SA is the default condition FabDigit quotes; Aged is available on request or by drawing note.
Advantages
- High strength — 740 MPa (107 ksi), better than 81% of cobalt-chrome alloy grades
Limitations
- Difficult to weld — 15/100, worse than 96% of cobalt-chrome alloy grades
- Needs corrosion protection — 68/100, worse than 80% of cobalt-chrome alloy grades
Stellite 6B Aged properties
Typical room-temperature values for Stellite 6B Aged; 22 are specific to this condition. Other listed values are Stellite 6B reference data and may not represent this condition. Bars are the position among cobalt-chrome alloy grades.
Physical3
Stellite 6B Aged has a density of 8.38 g/cm³ (0.303 lb/in³), lighter than 61% of cobalt-chrome alloy grades. It melts at 1,265°C (2,309 °F).
Mechanical15
Stellite 6B Aged has a yield strength of 740 MPa (107 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 81% of cobalt-chrome alloy grades. Elongation at break is 3% and the elastic modulus is 232 GPa (33.6 Msi).
Thermal6
Stellite 6B Aged is rated for continuous service to 800°C (1,472 °F). It conducts heat at 14.5 W/m·K (8.38 BTU/hr·ft·°F), better than 64% of cobalt-chrome alloy grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
Stellite 6B Aged conducts electricity at 2 % IACS, better than 65% of cobalt-chrome alloy grades.
Chemical & Environmental3
Corrosion resistance is good (68/100), worse than 80% of cobalt-chrome alloy grades.
Sustainability4
Producing a kilogram of Stellite 6B Aged takes about 210 MJ of energy and emits 15 kg of CO₂ — more than 80% of cobalt-chrome alloy grades. Typical recycled content is 25%.
Manufacturability6
Stellite 6B Aged's machinability is not recommended (5/100, worse than 82% of cobalt-chrome alloy grades); weldability poor (15/100); formability not recommended (5/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Stellite 6B Aged
Is Stellite 6B easy to machine?
Treat as a hardfacing alloy: grinding, EDM or waterjet preferred; if turning, use rigid setups, negative-rake carbide/CBN, low speed (5–15 m/min), heavy positive feed and flood coolant to avoid work hardening.
Can Stellite 6B be welded?
GTAW/PTA with matching Stellite 6 filler; preheat 300–500 °C, low heat input and slow cooling to limit carbide-network cracking, stress relieve after welding.
Can Stellite 6B be formed, bent or molded?
Hot form at 1050–1150 °C; cold forming limited to gentle bends in thin annealed strip with generous radii — the carbide network cracks under tight bends.
What surface finishes work on Stellite 6B?
Lapped/ground to mirror seal faces; no anodizing (non-aluminium); passivates naturally through its 30 % Cr, so plating or coating is rarely needed.
Stellite 6B 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 |
|---|---|---|
| Cforms Cr7C3/M23C6 carbides | 0.9 – 1.4 | 1.1 |
| Cr | 28 – 32 | 30 |
| W | 3.5 – 5.5 | 4.5 |
| Ni | ≤ 3 | 1.5 |
| Fe | ≤ 3 | 1.5 |
| Si | ≤ 2 | 0.7 |
| Mn | ≤ 2 | 1.4 |
| Mo | ≤ 1.5 | 0.5 |
| Cobalance, ~57–60 % | balance | — |
Stellite 6B Aged — frequently asked
What is Stellite 6B Aged used for?
Stellite 6B Aged is typically used for valve seat rings, wear rings and check valve components. In short: wrought, formable Stellite; ductile hardfacing alloy; sheet and strip availability.
What is the yield strength of Stellite 6B Aged?
Stellite 6B Aged has a typical yield strength of 740 MPa (107 ksi) and a tensile strength of 1,100 MPa (160 ksi) — stronger than 81% of cobalt-chrome alloy grades. Strength varies by condition: see the 3 listed tempers.
Is Stellite 6B Aged easy to machine?
Not especially — machinability is rated not recommended (5/100, worse than 82% of cobalt-chrome alloy grades). Treat as a hardfacing alloy: grinding, EDM or waterjet preferred; if turning, use rigid setups, negative-rake carbide/CBN, low speed (5–15 m/min), heavy positive feed and flood coolant to avoid work hardening.
Can Stellite 6B Aged be welded?
Not readily — weldability is rated poor (15/100). GTAW/PTA with matching Stellite 6 filler; preheat 300–500 °C, low heat input and slow cooling to limit carbide-network cracking, stress relieve after welding.
What surface finishes work on Stellite 6B Aged?
Lapped/ground to mirror seal faces; no anodizing (non-aluminium); passivates naturally through its 30 % Cr, so plating or coating is rarely needed.
Can Stellite 6B Aged be formed, bent or molded?
Hot form at 1050–1150 °C; cold forming limited to gentle bends in thin annealed strip with generous radii — the carbide network cracks under tight bends.
What is the maximum service temperature of Stellite 6B Aged?
Stellite 6B Aged is rated for continuous use to about 800°C (1,472 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Stellite 6B-SA and Stellite 6B Aged?
SA is the default condition — standard stocked condition: best combination of toughness and wear resistance for valve seats, wear rings and bushings. Aged: choose when maximum hardness and abrasive wear life matter more than impact toughness or ductility. Yield strength is 620 MPa in SA versus 740 MPa in Aged.
Sources
- AMS 5894 — Cobalt Alloy, Corrosion and Heat Resistant, Sheet, Strip, Plate and Bar (Stellite 6B, UNS R30016) — SAE International (2018)
- Stellite 6B wrought alloy technical data — Kennametal Stellite / Deloro (2021)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (Cobalt-base wear alloys) — ASM International (1990)
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.