Copper Alloy C99300
UNS C99300
C99300 is a special cast copper alloy with nickel and aluminium additions that develops high strength and wear resistance along with good bearing and anti-galling behaviour.
Reference datasheet — C99300 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 M01 condition
C99300 tempers and conditions
C99300 is supplied in 4 conditions, soft to hard. M01 is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
M01Default As sand cast | Standard supply condition for general bearings, bushings and wear parts poured in sand moulds. | 420 | 655 | 2.5 | 20 HRC | 6 % IACS |
As continuous cast | Continuous-cast bar/tube stock for machined bushings and wear plates with low porosity and consistent properties. | 430 | 670 | 3 | 20 HRC | 6 % IACS |
As centrifugally cast | Choose for tubular bushings and sleeves needing denser, finer structure and slightly higher strength. | 450 | 690 | 3 | 21 HRC | 6 % IACS |
Quench hardened and tempered | Pick when maximum hardness and wear/galling resistance are needed and low ductility is acceptable. | 520 | 760 | 1.5 | 25 HRC | 5.5 % IACS |
What is C99300?
C99300 is a special cast copper alloy with nickel and aluminium additions that develops high strength and wear resistance along with good bearing and anti-galling behaviour. It is used for wear plates, specialty bearings and marine and pump components, cast by sand, permanent-mould and continuous routes with a TQ50 condition on file, reaching 420 MPa yield, 655 MPa tensile, 205 HB (20 HRC) and service to 300 °C. Elongation is only 2.5 %, so the alloy is notch-sensitive and unsuitable for cold forming or shock loading. Unlike the leaded nickel silvers it can be welded with ERCuNiAl filler; C99500 is the tougher alternative when ductility is needed. C99300 has a density of 7.5 g/cm³ (0.271 lb/in³), lighter than 98% of copper alloy grades. It melts at 1,075°C (1,967 °F). C99300 has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 83% of copper alloy grades. Elongation at break is 2.5% and the elastic modulus is 120 GPa (17.4 Msi).
What is C99300 used for?
- wear plates
- specialty bearings
- marine hardware
- pump components
Advantages
- Lightweight — 7.5 g/cm³ (0.271 lb/in³), better than 98% of copper alloy grades
- Good corrosion resistance — 75/100, better than 90% of copper alloy grades
- High service temperature — 300°C (572 °F), better than 85% of copper alloy grades
- High strength — 420 MPa (60.9 ksi), better than 83% of copper alloy grades
Limitations
- Limited formability — 5/100, worse than 98% of copper alloy grades
- Limited ductility — 2.5%, worse than 97% of copper alloy grades
- Low electrical conductivity — 6 % IACS, worse than 93% of copper alloy grades
- Poor heat conductor — 30 W/m·K (17.3 BTU/hr·ft·°F), worse than 91% of copper alloy grades
- Difficult to machine — 25/100, worse than 86% of copper alloy grades
C99300 properties
Typical room-temperature values for C99300-M01; bars are the position among copper alloy grades.
Physical3
C99300 has a density of 7.5 g/cm³ (0.271 lb/in³), lighter than 98% of copper alloy grades. It melts at 1,075°C (1,967 °F).
Mechanical16
C99300 has a yield strength of 420 MPa (60.9 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 83% of copper alloy grades. Elongation at break is 2.5% and the elastic modulus is 120 GPa (17.4 Msi).
Thermal6
C99300 is rated for continuous service to 300°C (572 °F). It conducts heat at 30 W/m·K (17.3 BTU/hr·ft·°F), worse than 91% of copper alloy grades. Thermal expansion is 16 µm/m·K (8.89 µin/in·°F).
Electrical3
C99300 conducts electricity at 6 % IACS, worse than 93% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (75/100), better than 90% of copper alloy grades.
Sustainability4
Producing a kilogram of C99300 takes about 75 MJ of energy and emits 4.6 kg of CO₂ — more than 88% of copper alloy grades. Typical recycled content is 40%.
Manufacturability7
C99300's machinability is poor (25/100, worse than 86% of copper alloy grades); weldability fair (40/100); formability not recommended (5/100).
Common Calculations5
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 copper alloy family
Yield strength against density for every copper alloy grade FabDigit runs. C99300 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C99300
Is C99300 easy to machine?
Tough, gummy and abrasive — use sharp carbide with positive rake, low speed (~40–70 m/min), heavy feed and flood coolant; avoid dwelling to prevent work hardening.
Can C99300 be welded?
GTAW/GMAW with nickel-aluminium bronze filler (ERCuNiAl), preheat 150–250 °C, control interpass temperature and clean the tenacious Al oxide before each pass.
Can C99300 be formed, bent or molded?
Cast-only alloy — not cold formable; design generous fillets, use chills and risers to avoid shrinkage porosity and control melt oxide/hydrogen.
C99300 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 |
|---|---|---|
| NiNi + Co | 13.5 – 16.5 | 15 |
| Al | 9.5 – 10.5 | 10 |
| Fe | ≤ 1 | 0.5 |
| Mn | ≤ 0.5 | 0.2 |
| Zn | ≤ 0.5 | |
| Pbessentially lead-free | ≤ 0.02 | |
| Curemainder; CDA registration lists a 55.0 % minimum | ≥ 55 (balance) |
What surface finishes work on C99300?
Machines and polishes to a bright bronze finish; not anodizable — protect with passivation/oil or leave bare for seawater service where the natural oxide film is beneficial.
Surface treatments FabDigit runs on copper alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
How much does C99300 cost?
C99300 is a high-cost copper 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.
C99300 — frequently asked
What is C99300 used for?
C99300 is typically used for wear plates, specialty bearings, marine hardware and pump components. In short: highest-strength C99 casting; wear and anti-galling grade; only 2.5 % elongation.
What is the yield strength of C99300?
C99300 has a typical yield strength of 420 MPa (60.9 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 83% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C99300 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 86% of copper alloy grades). Tough, gummy and abrasive — use sharp carbide with positive rake, low speed (~40–70 m/min), heavy feed and flood coolant; avoid dwelling to prevent work hardening.
Can C99300 be welded?
With care — weldability is rated fair (40/100). GTAW/GMAW with nickel-aluminium bronze filler (ERCuNiAl), preheat 150–250 °C, control interpass temperature and clean the tenacious Al oxide before each pass.
What surface finishes work on C99300?
Machines and polishes to a bright bronze finish; not anodizable — protect with passivation/oil or leave bare for seawater service where the natural oxide film is beneficial.
Can C99300 be formed, bent or molded?
Cast-only alloy — not cold formable; design generous fillets, use chills and risers to avoid shrinkage porosity and control melt oxide/hydrogen.
What is the maximum service temperature of C99300?
C99300 is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C99300-M01 and C99300-TQ50?
M01 is the default condition — standard supply condition for general bearings, bushings and wear parts poured in sand moulds. TQ50: pick when maximum hardness and wear/galling resistance are needed and low ductility is acceptable. Yield strength is 420 MPa in M01 versus 520 MPa in TQ50.
How much does C99300 cost?
C99300 is a high-cost copper 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
- ASTM B505/B505M — Continuous Cast Copper Alloy Castings — ASTM International (2018)
- ASTM B22 / ASTM B271 (cast copper alloy product standards) — ASTM International (2021)
- CDA UNS C99300 alloy datasheet — Copper Development Association (copper.org) (2024)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
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.