Copper Alloy C90200-M02
Heat-treated state
UNS C90200
M02 = as centrifugally cast
Choose for rings, sleeves and bushings needing denser, sounder metal than sand casting.
Values for the M02 condition
Other C90200 tempers and conditions
C90200 is listed in 4 conditions; see the grade overview at C90200.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
M01Default As sand cast | Standard general-purpose sand-cast condition for valve bodies, fittings and pressure-tight castings. | 124 | 276 | 30 | 60 HB | 14 % IACS |
As plaster cast | For small, thin-walled or intricate near-net-shape parts where machining allowance must be minimal. | 130 | 280 | 25 | 62 HB | 14 % IACS |
M02This page As centrifugally cast | Choose for rings, sleeves and bushings needing denser, sounder metal than sand casting. | 138 | 300 | 25 | 65 HB | 14 % IACS |
As continuous cast | Best choice for stock bar/tube to be machined: fine grain, low porosity, highest as-cast strength. | 145 | 310 | 22 | 70 HB | 14 % IACS |
What is C90200-M02?
C90200-M02 is C90200 heat treated to M02 — choose for rings, sleeves and bushings needing denser, sounder metal than sand casting. C90200-M02 has a yield strength of 138 MPa (20 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 76% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 103 GPa (14.9 Msi). C90200-M02 has a density of 8.72 g/cm³ (0.315 lb/in³), lighter than 54% of copper alloy grades. It melts at 855°C (1,571 °F). M01 is the default condition FabDigit quotes; M02 is available on request or by drawing note.
Advantages
- Good corrosion resistance — 73/100, better than 87% of copper alloy grades
Limitations
- Limited formability — 10/100, worse than 89% of copper alloy grades
- Hard to polish — 65/100, worse than 87% of copper alloy grades
- Low strength — 138 MPa (20 ksi), worse than 76% of copper alloy grades
C90200-M02 properties
Typical room-temperature values for C90200-M02; 21 are specific to this condition. Other listed values are C90200 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C90200-M02 has a density of 8.72 g/cm³ (0.315 lb/in³), lighter than 54% of copper alloy grades. It melts at 855°C (1,571 °F).
Mechanical15
C90200-M02 has a yield strength of 138 MPa (20 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 76% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
C90200-M02 is rated for continuous service to 230°C (446 °F). It conducts heat at 71 W/m·K (41 BTU/hr·ft·°F), worse than 54% of copper alloy grades. Thermal expansion is 18 µm/m·K (10 µin/in·°F).
Electrical3
C90200-M02 conducts electricity at 14 % IACS, worse than 56% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (73/100), better than 87% of copper alloy grades.
Sustainability4
Producing a kilogram of C90200-M02 takes about 55 MJ of energy and emits 3.8 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 70%.
Manufacturability8
C90200-M02's machinability is poor (32/100, worse than 57% of copper alloy grades); weldability fair (45/100); formability not recommended (10/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C90200-M02
Is C90200 easy to machine?
Machinability ≈30% of free-cutting brass — gummy without lead; use sharp positive-rake carbide, high speed, light feed and good lubrication; continuous-cast stock machines best.
Can C90200 be welded?
Braze and solder readily; arc/gas welding is fair — use ERCuSn-A filler, preheat 150–200 °C and avoid heavy restraint to prevent hot cracking.
Can C90200 be formed, bent or molded?
Casting alloy only (no wrought forms); long freezing range means directional solidification with generous risers and chills is needed for pressure-tight sections.
What surface finishes work on C90200?
Not anodizable; finish by machining/polishing, chemical patination (statuary brown/green), tin or nickel plating for potable-water service, and lacquer to hold bright colour.
C90200 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 |
|---|---|---|
| Sn | 6 – 8 | 7 |
| Pb | ≤ 0.3 | — |
| Zn | ≤ 0.5 | — |
| Fe | ≤ 0.2 | — |
| NiNi incl. Co | ≤ 0.5 | — |
| Sb | ≤ 0.2 | — |
| S | ≤ 0.05 | — |
| P | ≤ 0.05 | — |
| Al | ≤ 0.01 | — |
| Si | ≤ 0.01 | — |
| CuCu + named elements ≥ 99.4% | ≥ 91 (balance) | — |
C90200-M02 — frequently asked
What is C90200-M02 used for?
C90200-M02 is typically used for valve bodies, pump parts, bearings and fittings. In short: general-purpose tin bronze; pressure-tight castings; unleaded, ductile at 30 %.
What is the yield strength of C90200-M02?
C90200-M02 has a typical yield strength of 138 MPa (20 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 76% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C90200-M02 easy to machine?
Not especially — machinability is rated poor (32/100, worse than 57% of copper alloy grades). Machinability ≈30% of free-cutting brass — gummy without lead; use sharp positive-rake carbide, high speed, light feed and good lubrication; continuous-cast stock machines best.
Can C90200-M02 be welded?
With care — weldability is rated fair (45/100). Braze and solder readily; arc/gas welding is fair — use ERCuSn-A filler, preheat 150–200 °C and avoid heavy restraint to prevent hot cracking.
What surface finishes work on C90200-M02?
Not anodizable; finish by machining/polishing, chemical patination (statuary brown/green), tin or nickel plating for potable-water service, and lacquer to hold bright colour.
Can C90200-M02 be formed, bent or molded?
Casting alloy only (no wrought forms); long freezing range means directional solidification with generous risers and chills is needed for pressure-tight sections.
What is the maximum service temperature of C90200-M02?
C90200-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 C90200-M01 and C90200-M07?
M01 is the default condition — standard general-purpose sand-cast condition for valve bodies, fittings and pressure-tight castings. M07: best choice for stock bar/tube to be machined: fine grain, low porosity, highest as-cast strength. Yield strength is 124 MPa in M01 versus 145 MPa in M07.
Sources
- ASTM B584 — Copper Alloy Sand Castings for General Applications — ASTM International (2022)
- ASTM B505/B505M — Copper Alloy Continuous Castings — ASTM International (2018)
- ASTM B271 — Copper-Base Alloy Centrifugal Castings — ASTM International (2020)
- CDA Standard Designation C90200 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.