Copper Alloy C92800-M02
Heat-treated state
UNS C92800
M02 = as centrifugally cast
Chill-cast bushings and small wear parts; finer δ-phase distribution gives slightly higher strength and hardness than sand cast.
Values for the M02 condition
Other C92800 tempers and conditions
C92800 is listed in 4 conditions; see the grade overview at C92800.
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 bearings, bushings and gear blanks poured in sand moulds (ASTM B505/B22 shapes). | 179 | 276 | 1 | 85 HB | 11 % IACS |
M02This page As centrifugally cast | Chill-cast bushings and small wear parts; finer δ-phase distribution gives slightly higher strength and hardness than sand cast. | 195 | 295 | 1 | 95 HB | 11 % IACS |
As chill cast | Choose for large-diameter bushings, sleeves and worm-gear rims where dense, porosity-free walls are required. | 200 | 300 | 1 | 95 HB | 11 % IACS |
As continuous cast | Continuous-cast bar and tube stock (ASTM B505) for machined bushings — most uniform structure and best machining behaviour. | 205 | 310 | 1 | 95 HB | 11 % IACS |
What is C92800-M02?
C92800-M02 is C92800 heat treated to M02 — chill-cast bushings and small wear parts; finer δ-phase distribution gives slightly higher strength and hardness than sand cast. C92800-M02 has a yield strength of 195 MPa (28.3 ksi) and a tensile strength of 295 MPa (42.8 ksi) — weaker than 56% of copper alloy grades. Elongation at break is 1% and the elastic modulus is 103 GPa (14.9 Msi). C92800-M02 has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 58% of copper alloy grades. It melts at 830°C (1,526 °F). M01 is the default condition FabDigit quotes; M02 is available on request or by drawing note.
Advantages
- Easy to machine — 70/100, better than 78% of copper alloy grades
Limitations
- Limited ductility — 1%, worse than 99% of copper alloy grades
- Difficult to weld — 10/100, worse than 98% of copper alloy grades
- Limited formability — 5/100, worse than 98% of copper alloy grades
- High embodied carbon — 4.5 kg CO₂/kg, worse than 79% of copper alloy grades
C92800-M02 properties
Typical room-temperature values for C92800-M02; 21 are specific to this condition. Other listed values are C92800 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C92800-M02 has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 58% of copper alloy grades. It melts at 830°C (1,526 °F).
Mechanical15
C92800-M02 has a yield strength of 195 MPa (28.3 ksi) and a tensile strength of 295 MPa (42.8 ksi) — weaker than 56% of copper alloy grades. Elongation at break is 1% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
C92800-M02 is rated for continuous service to 230°C (446 °F). It conducts heat at 47 W/m·K (27.2 BTU/hr·ft·°F), worse than 69% of copper alloy grades. Thermal expansion is 18 µm/m·K (10 µin/in·°F).
Electrical3
C92800-M02 conducts electricity at 11 % IACS, worse than 68% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (60/100), worse than 68% of copper alloy grades.
Sustainability4
Producing a kilogram of C92800-M02 takes about 62 MJ of energy and emits 4.5 kg of CO₂ — more than 76% of copper alloy grades. Typical recycled content is 50%.
Manufacturability8
C92800-M02's machinability is very good (70/100, better than 78% of copper alloy grades); weldability not recommended (10/100); formability not recommended (5/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C92800-M02
Is C92800 easy to machine?
Machines freely with sharp carbide or HSS tooling at moderate speeds; lead chips break well but the hard δ-phase abrades edges — use rigid setups and light finishing feeds.
Can C92800 be welded?
Not weldable in practice (hot-short, lead-bearing); repair by soldering or brazing only, or replace the casting.
Can C92800 be formed, bent or molded?
Cast to shape only — no hot or cold working; provide generous risers and controlled cooling to avoid tin sweat and shrinkage porosity in heavy sections.
What surface finishes work on C92800?
Normally supplied as-machined or honed; tin, nickel or chrome plating and light polishing are practical, anodizing is not applicable.
C92800 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 |
|---|---|---|
| CuCu + named elements ≥ 99.4% | 78 – 82 | 80 |
| Snforms hard δ-phase | 15 – 17 | 16 |
| Pbsolid lubricant / machinability | 4 – 6 | 5 |
| Niincluding Co | ≤ 0.8 | 0.3 |
| Zn | ≤ 0.25 | — |
| Fe | ≤ 0.2 | — |
| Sb | ≤ 0.25 | — |
| P | ≤ 0.05 | — |
| S | ≤ 0.05 | — |
| Al | ≤ 0.01 | — |
| Si | ≤ 0.01 | — |
C92800-M02 — frequently asked
What is C92800-M02 used for?
C92800-M02 is typically used for heavy-duty bearings, bushings and wear plates. In short: highest-tin bearing bronze; high load capacity; very low ductility.
What is the yield strength of C92800-M02?
C92800-M02 has a typical yield strength of 195 MPa (28.3 ksi) and a tensile strength of 295 MPa (42.8 ksi) — weaker than 56% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C92800-M02 easy to machine?
Yes — machinability is rated very good (70/100, better than 78% of copper alloy grades). Machines freely with sharp carbide or HSS tooling at moderate speeds; lead chips break well but the hard δ-phase abrades edges — use rigid setups and light finishing feeds.
Can C92800-M02 be welded?
Not readily — weldability is rated not recommended (10/100). Not weldable in practice (hot-short, lead-bearing); repair by soldering or brazing only, or replace the casting.
What surface finishes work on C92800-M02?
Normally supplied as-machined or honed; tin, nickel or chrome plating and light polishing are practical, anodizing is not applicable.
Can C92800-M02 be formed, bent or molded?
Cast to shape only — no hot or cold working; provide generous risers and controlled cooling to avoid tin sweat and shrinkage porosity in heavy sections.
What is the maximum service temperature of C92800-M02?
C92800-M02 is rated for continuous use to about 230°C (446 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C92800-M01 and C92800-M07?
M01 is the default condition — standard supply condition for bearings, bushings and gear blanks poured in sand moulds (ASTM B505/B22 shapes). M07: continuous-cast bar and tube stock (ASTM B505) for machined bushings — most uniform structure and best machining behaviour. Yield strength is 179 MPa in M01 versus 205 MPa in M07.
Sources
- ASTM B505/B505M — Copper Alloy Continuous Castings — ASTM (2018)
- ASTM B22 — Bronze Castings for Bridges and Turntables — ASTM (2017)
- CDA Alloy Datasheet C92800 (high-leaded tin bronze) — Copper Development Association (2023)
- ASM Handbook Vol.2 — Properties of Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials — ASM International (2005)
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.