Cobalt-Chrome Alloy Stellite 1
UNS R30001
Stellite 1 is a high-carbon Co-Cr-W hardfacing alloy (UNS R30001) with an abundant hard-carbide network, giving the family's maximum abrasion and metal-to-metal wear resistance at about 53 HRC.
Reference datasheet — Stellite 1 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 Cast condition
Stellite 1 tempers and conditions
Stellite 1 is supplied in one standard condition, Cast. Cast is the default FabDigit quotes; the values on this page are for it.
Supply forms, finishes and certifications
Ways Stellite 1 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
GTAW | GTAW/TIG deposit with bare cast rod | Surface finish |
LASER | Laser cladding deposit | Surface finish |
OAW | Oxy-acetylene deposit | Surface finish |
SMAW | SMAW deposit | Surface finish |
SPRAYFUSE | Spray-and-fuse deposit | Surface finish |
HVOF | HVOF thermal spray coating | Coating |
PTA | PTA deposit | Coating |
What is Stellite 1?
Stellite 1 is a high-carbon Co-Cr-W hardfacing alloy (UNS R30001) with an abundant hard-carbide network, giving the family's maximum abrasion and metal-to-metal wear resistance at about 53 HRC. It is supplied as castings, cast rod, covered electrodes and atomized powder and applied by OAW, GTAW, PTA, SMAW, laser cladding, HVOF or spray-fuse. The limits are brittleness — 620 MPa tensile at 0.5 % elongation — so it cracks under impact or weld restraint, service is capped near 750 °C, and finishing is by grinding or EDM only. Use Stellite 12 or Stellite 6 where some toughness is required. Stellite 1 has a density of 8.69 g/cm³ (0.314 lb/in³), heavier than 86% of cobalt-chrome alloy grades. It melts at 1,255°C (2,291 °F). Stellite 1 has a tensile strength of 620 MPa (89.9 ksi), weaker than 89% of cobalt-chrome alloy grades. Elongation at break is 0.5% and the elastic modulus is 250 GPa (36.3 Msi).
What is Stellite 1 used for?
- valve seats
- cutting tips
- wear pads
- hardfacing rods
Limitations
- Needs corrosion protection — 55/100, worse than 93% of cobalt-chrome alloy grades
- Limited ductility — 0.5%, worse than 89% of cobalt-chrome alloy grades
- Difficult to weld — 20/100, worse than 87% of cobalt-chrome alloy grades
Stellite 1 properties
Typical room-temperature values for Stellite 1-Cast; bars are the position among cobalt-chrome alloy grades.
Physical3
Stellite 1 has a density of 8.69 g/cm³ (0.314 lb/in³), heavier than 86% of cobalt-chrome alloy grades. It melts at 1,255°C (2,291 °F).
Mechanical11
Stellite 1 has a tensile strength of 620 MPa (89.9 ksi), weaker than 89% of cobalt-chrome alloy grades. Elongation at break is 0.5% and the elastic modulus is 250 GPa (36.3 Msi).
Thermal5
Stellite 1 is rated for continuous service to 750°C (1,382 °F). It conducts heat at 14.8 W/m·K (8.55 BTU/hr·ft·°F), better than 84% of cobalt-chrome alloy grades. Thermal expansion is 11 µm/m·K (6.11 µin/in·°F).
Electrical3
Stellite 1 conducts electricity at 1.9 % IACS, worse than 52% of cobalt-chrome alloy grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 93% of cobalt-chrome alloy grades.
Sustainability4
Producing a kilogram of Stellite 1 takes about 150 MJ of energy and emits 12 kg of CO₂ — less than 59% of cobalt-chrome alloy grades. Typical recycled content is 20%.
Manufacturability8
Stellite 1's machinability is not recommended (4/100, worse than 95% of cobalt-chrome alloy grades); weldability poor (20/100); formability not recommended (2/100).
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 cobalt-chrome alloy family
Yield strength against density for every cobalt-chrome alloy grade FabDigit runs. Stellite 1 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Stellite 1
Is Stellite 1 easy to machine?
Effectively unmachinable as deposited — finish by grinding (SiC/CBN wheels), EDM or lapping; any pre-machining must be done on the softer substrate.
Can Stellite 1 be welded?
Deposit with preheat 300–500 °C, low heat input and slow furnace cooling; multi-pass overlays crack readily, so build minimum thickness and avoid restraint.
Can Stellite 1 be formed, bent or molded?
No cold or hot forming; supplied as castings, cast rod or atomized powder and applied by casting, welding overlay or thermal spray.
Stellite 1 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 |
|---|---|---|
| Chigh carbon → ~30 vol% carbides | 2 – 3 | 2.45 |
| Cr | 28 – 32 | 30.5 |
| W | 11 – 14 | 12.5 |
| Ni | ≤ 3 | 1 |
| Fe | ≤ 3 | 1.5 |
| Si | ≤ 2 | 1.1 |
| Mn | ≤ 1 | 0.5 |
| Mo | ≤ 1 | 0.3 |
| Cobalance, ~47–50% | balance |
What surface finishes work on Stellite 1?
Ground and lapped to a mirror seat finish; no anodizing or plating — the alloy is used bare and self-passivates in air/steam.
Equivalent designations
Standards and trade names that resolve to Cobalt-Chrome Alloy Stellite 1 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- R30001
How much does Stellite 1 cost?
Stellite 1 is a high-cost cobalt-chrome alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Stellite 1 — frequently asked
What is Stellite 1 used for?
Stellite 1 is typically used for valve seats, cutting tips, wear pads and hardfacing rods. In short: hardest Stellite grade; maximum abrasion resistance; grind-only finishing.
What is the tensile strength of Stellite 1?
Stellite 1 has a typical tensile strength of 620 MPa (89.9 ksi) — weaker than 89% of cobalt-chrome alloy grades.
Is Stellite 1 easy to machine?
Not especially — machinability is rated not recommended (4/100, worse than 95% of cobalt-chrome alloy grades). Effectively unmachinable as deposited — finish by grinding (SiC/CBN wheels), EDM or lapping; any pre-machining must be done on the softer substrate.
Can Stellite 1 be welded?
Not readily — weldability is rated poor (20/100). Deposit with preheat 300–500 °C, low heat input and slow furnace cooling; multi-pass overlays crack readily, so build minimum thickness and avoid restraint.
What surface finishes work on Stellite 1?
Ground and lapped to a mirror seat finish; no anodizing or plating — the alloy is used bare and self-passivates in air/steam.
Can Stellite 1 be formed, bent or molded?
No cold or hot forming; supplied as castings, cast rod or atomized powder and applied by casting, welding overlay or thermal spray.
What is the maximum service temperature of Stellite 1?
Stellite 1 is rated for continuous use to about 750°C (1,382 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does Stellite 1 cost?
Stellite 1 is a high-cost cobalt-chrome alloy ($$$$), 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
- AWS A5.21 — Bare Electrodes and Rods for Surfacing (ERCoCr-C) — AWS (2011)
- AWS A5.13 — Surfacing Electrodes for SMAW (ECoCr-C) — AWS (2010)
- UNS R30001 alloy designation — SAE/ASTM Metals & Alloys in the Unified Numbering System (2017)
- Stellite 1 alloy technical data — Kennametal Stellite (2021)
- ASM Handbook Vol.6 — Welding, Brazing and Soldering (Hardfacing Alloys) — ASM International (1993)
- Cobalt-base hardfacing powders for PTA/HVOF/laser cladding — Oerlikon Metco (2020)
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.