Copper Alloy C99300-M02
Heat-treated state
UNS C99300
M02 = as centrifugally cast
Choose for tubular bushings and sleeves needing denser, finer structure and slightly higher strength.
Values for the M02 condition
Other C99300 tempers and conditions
C99300 is listed in 4 conditions; see the grade overview at C99300.
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 |
M02This page 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-M02?
C99300-M02 is C99300 heat treated to M02 — choose for tubular bushings and sleeves needing denser, finer structure and slightly higher strength. C99300-M02 has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 86% of copper alloy grades. Elongation at break is 3% and the elastic modulus is 120 GPa (17.4 Msi). C99300-M02 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). M01 is the default condition FabDigit quotes; M02 is available on request or by drawing note.
Advantages
- Lightweight — 7.5 g/cm³ (0.271 lb/in³), better than 98% of copper alloy grades
- Good corrosion resistance — 76/100, better than 91% of copper alloy grades
- High strength — 450 MPa (65.3 ksi), better than 86% of copper alloy grades
- High service temperature — 300°C (572 °F), better than 85% of copper alloy grades
Limitations
- Limited formability — 5/100, worse than 98% of copper alloy grades
- Limited ductility — 3%, 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-M02 properties
Typical room-temperature values for C99300-M02; 22 are specific to this condition. Other listed values are C99300 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C99300-M02 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-M02 has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 86% of copper alloy grades. Elongation at break is 3% and the elastic modulus is 120 GPa (17.4 Msi).
Thermal6
C99300-M02 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-M02 conducts electricity at 6 % IACS, worse than 93% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (76/100), better than 91% of copper alloy grades.
Sustainability4
Producing a kilogram of C99300-M02 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-M02's machinability is poor (25/100, worse than 86% of copper alloy grades); weldability fair (40/100); formability not recommended (5/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C99300-M02
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.
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.
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) | — |
C99300-M02 — frequently asked
What is C99300-M02 used for?
C99300-M02 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-M02?
C99300-M02 has a typical yield strength of 450 MPa (65.3 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 86% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C99300-M02 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-M02 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-M02?
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-M02 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-M02?
C99300-M02 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.