Copper Alloy C92900-M02
Heat-treated state
UNS C92900
M02 = as centrifugally cast
Best route for large rings, gear rims and thick-wall bushings — centrifugal pressure gives sound, fine-grained metal.
Values for the M02 condition
Other C92900 tempers and conditions
C92900 is listed in 4 conditions; see the grade overview at C92900.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As sand cast | Choose for one-off or large complex shapes (worm gear blanks, housings); slightly lower strength and more porosity than continuous cast. | 180 | 325 | 8 | 100 HB | 10 % IACS |
As pressure die cast | For repeat-production small/medium parts needing closer dimensions than sand casting and a chilled, fine structure. | 210 | 345 | 8 | 105 HB | 10 % IACS |
M02This page As centrifugally cast | Best route for large rings, gear rims and thick-wall bushings — centrifugal pressure gives sound, fine-grained metal. | 215 | 350 | 10 | 105 HB | 10 % IACS |
M07Default As continuous cast | Standard stock form (continuous-cast bar/tube per ASTM B505) — densest structure and highest strength; pick for machined gears, nuts and bushings. | 220 | 345 | 10 | 105 HB | 10 % IACS |
What is C92900-M02?
C92900-M02 is C92900 heat treated to M02 — best route for large rings, gear rims and thick-wall bushings — centrifugal pressure gives sound, fine-grained metal. C92900-M02 has a yield strength of 215 MPa (31.2 ksi) and a tensile strength of 350 MPa (50.8 ksi) — weaker than 52% of copper alloy grades. Elongation at break is 10% and the elastic modulus is 107 GPa (15.5 Msi). C92900-M02 has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 58% of copper alloy grades. It melts at 855°C (1,571 °F). M07 is the default condition FabDigit quotes; M02 is available on request or by drawing note.
Advantages
- Easy to machine — 75/100, better than 80% of copper alloy grades
- High service temperature — 260°C (500 °F), better than 75% of copper alloy grades
Limitations
- Limited formability — 5/100, worse than 98% of copper alloy grades
- Hard to polish — 60/100, worse than 92% of copper alloy grades
- Difficult to weld — 20/100, worse than 88% of copper alloy grades
- Limited ductility — 10%, worse than 76% of copper alloy grades
- Poor heat conductor — 45 W/m·K (26 BTU/hr·ft·°F), worse than 76% of copper alloy grades
C92900-M02 properties
Typical room-temperature values for C92900-M02; 21 are specific to this condition. Other listed values are C92900 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C92900-M02 has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 58% of copper alloy grades. It melts at 855°C (1,571 °F).
Mechanical15
C92900-M02 has a yield strength of 215 MPa (31.2 ksi) and a tensile strength of 350 MPa (50.8 ksi) — weaker than 52% of copper alloy grades. Elongation at break is 10% and the elastic modulus is 107 GPa (15.5 Msi).
Thermal6
C92900-M02 is rated for continuous service to 260°C (500 °F). It conducts heat at 45 W/m·K (26 BTU/hr·ft·°F), worse than 76% of copper alloy grades. Thermal expansion is 18 µm/m·K (10 µin/in·°F).
Electrical3
C92900-M02 conducts electricity at 10 % IACS, worse than 74% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 58% of copper alloy grades.
Sustainability4
Producing a kilogram of C92900-M02 takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 60%.
Manufacturability8
C92900-M02's machinability is very good (75/100, better than 80% of copper alloy grades); weldability poor (20/100); formability not recommended (5/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C92900-M02
Is C92900 easy to machine?
Free-machining thanks to lead and the hard δ-phase: use sharp positive-rake carbide, high speed, light feed and generous coolant; chips break short and surfaces finish well for bearing bores.
Can C92900 be welded?
Poor weldability — lead causes hot cracking; repair by brazing or by low-heat GTAW with matching bronze filler, preheat and slow cooling, or prefer mechanical joining.
Can C92900 be formed, bent or molded?
Casting alloy only — not cold formable; needs strong risers/chills to avoid tin microporosity, and pouring around 1100–1150 °C with degassing/deoxidation (P or Ca-B).
What surface finishes work on C92900?
Machine or grind bearing surfaces; can be tin- or nickel-plated, chemically patinated or lacquered; anodizing is not applicable.
C92900 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 = 99.3 % min | 82 – 86 | 84 |
| Sn | 9 – 11 | 10 |
| Pb | 2 – 3.2 | 2.5 |
| NiNi + Co | 2.8 – 4 | 3.4 |
| Zn | ≤ 0.25 | — |
| Fe | ≤ 0.2 | — |
| Sb | ≤ 0.25 | — |
| P | ≤ 0.5 | — |
| S | ≤ 0.05 | — |
| Al | ≤ 0.01 | — |
| Si | ≤ 0.01 | — |
C92900-M02 — frequently asked
What is C92900-M02 used for?
C92900-M02 is typically used for gears, worm wheels and structural castings. In short: strongest leaded tin bronze; nickel-refined casting alloy; free-machining at 75.
What is the yield strength of C92900-M02?
C92900-M02 has a typical yield strength of 215 MPa (31.2 ksi) and a tensile strength of 350 MPa (50.8 ksi) — weaker than 52% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C92900-M02 easy to machine?
Yes — machinability is rated very good (75/100, better than 80% of copper alloy grades). Free-machining thanks to lead and the hard δ-phase: use sharp positive-rake carbide, high speed, light feed and generous coolant; chips break short and surfaces finish well for bearing bores.
Can C92900-M02 be welded?
Not readily — weldability is rated poor (20/100). Poor weldability — lead causes hot cracking; repair by brazing or by low-heat GTAW with matching bronze filler, preheat and slow cooling, or prefer mechanical joining.
What surface finishes work on C92900-M02?
Machine or grind bearing surfaces; can be tin- or nickel-plated, chemically patinated or lacquered; anodizing is not applicable.
Can C92900-M02 be formed, bent or molded?
Casting alloy only — not cold formable; needs strong risers/chills to avoid tin microporosity, and pouring around 1100–1150 °C with degassing/deoxidation (P or Ca-B).
What is the maximum service temperature of C92900-M02?
C92900-M02 is rated for continuous use to about 260°C (500 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C92900-M07 and C92900-M01?
M07 is the default condition — standard stock form (continuous-cast bar/tube per ASTM B505) — densest structure and highest strength; pick for machined gears, nuts and bushings. M01: choose for one-off or large complex shapes (worm gear blanks, housings); slightly lower strength and more porosity than continuous cast. Yield strength is 220 MPa in M07 versus 180 MPa in M01.
Sources
- ASTM B505/B505M — Continuous Cast Copper Alloys — ASTM International (2022)
- ASTM B22 — Bronze Castings for Bridges and Turntables — ASTM International (2017)
- Copper Alloy C92900 alloy datasheet (copper.org) — Copper Development Association (2024)
- ASM Handbook Vol. 2 — Properties and Selection: 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.