Copper Alloy C89844-M02
Heat-treated state
UNS C89844
M02 = as centrifugally cast
Pick for rings, bushings and sleeves needing a dense, inclusion-free wall from centrifugal casting.
Values for the M02 condition
Other C89844 tempers and conditions
C89844 is listed in 5 conditions; see the grade overview at C89844.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
M01Default As sand cast | Standard as-cast sand casting condition for valve bodies and plumbing fittings; most widely stocked/produced form. | 110 | 255 | 20 | 55 HB | 17 % IACS |
As investment cast | Use for complex near-net-shape lead-free valve internals where machining access is limited. | 115 | 255 | 18 | 56 HB | 17 % IACS |
M02This page As centrifugally cast | Pick for rings, bushings and sleeves needing a dense, inclusion-free wall from centrifugal casting. | 120 | 265 | 20 | 58 HB | 17 % IACS |
As plaster cast | Choose for higher-volume fittings needing better surface finish, tighter tolerance and slightly higher strength than sand cast. | 125 | 275 | 18 | 60 HB | 17 % IACS |
As continuous cast | Continuous-cast bar/tube stock for screw-machined low-lead plumbing components; finest grain and highest yield strength. | 150 | 290 | 13 | 68 HB | 17 % IACS |
What is C89844-M02?
C89844-M02 is C89844 heat treated to M02 — pick for rings, bushings and sleeves needing a dense, inclusion-free wall from centrifugal casting. C89844-M02 has a yield strength of 120 MPa (17.4 ksi) and a tensile strength of 265 MPa (38.4 ksi) — weaker than 79% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 95 GPa (13.8 Msi). C89844-M02 has a density of 8.6 g/cm³ (0.311 lb/in³), lighter than 59% of copper alloy grades. It melts at 843°C (1,549 °F). M01 is the default condition FabDigit quotes; M02 is available on request or by drawing note.
Advantages
- Easy to machine — 80/100, better than 86% of copper alloy grades
Limitations
- Low stiffness — 95 GPa (13.8 Msi), worse than 93% of copper alloy grades
- Low strength — 120 MPa (17.4 ksi), worse than 79% of copper alloy grades
C89844-M02 properties
Typical room-temperature values for C89844-M02; 20 are specific to this condition. Other listed values are C89844 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C89844-M02 has a density of 8.6 g/cm³ (0.311 lb/in³), lighter than 59% of copper alloy grades. It melts at 843°C (1,549 °F).
Mechanical14
C89844-M02 has a yield strength of 120 MPa (17.4 ksi) and a tensile strength of 265 MPa (38.4 ksi) — weaker than 79% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 95 GPa (13.8 Msi).
Thermal6
C89844-M02 is rated for continuous service to 200°C (392 °F). It conducts heat at 72 W/m·K (41.6 BTU/hr·ft·°F), worse than 52% of copper alloy grades. Thermal expansion is 20.5 µm/m·K (11.4 µin/in·°F).
Electrical3
C89844-M02 conducts electricity at 17 % IACS, better than 50% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (66/100), better than 64% of copper alloy grades.
Sustainability4
Producing a kilogram of C89844-M02 takes about 58 MJ of energy and emits 3.8 kg of CO₂ — more than 61% of copper alloy grades. Typical recycled content is 45%.
Manufacturability7
C89844-M02's machinability is very good (80/100, better than 86% of copper alloy grades); weldability poor (30/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C89844-M02
Is C89844 easy to machine?
Machines like a leaded red brass at roughly 80 % of C36000 — use sharp positive-rake tooling, higher feed to break the shorter chip, and avoid dwell that smears the bismuth phase.
Can C89844 be welded?
Fusion welding is not recommended (bismuth grain-boundary films cause hot cracking); join by soldering or silver brazing with low-temperature, short-dwell cycles.
Can C89844 be formed, bent or molded?
Foundry alloy only: pour 1050–1120 °C, use good risering and chills as the freezing range is wide; not intended for cold or hot working.
What surface finishes work on C89844?
Buffs and polishes well and accepts standard Ni/Cr and PVD decorative plating; pickle carefully since bismuth-rich surface layers can etch preferentially.
C89844 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 |
|---|---|---|
| Cusemi-red brass base | 79 – 83 | 81 |
| Sn | 2 – 4 | 3 |
| Bifree-machining phase replacing Pb | 0.8 – 2.2 | 1.5 |
| Serefines/disperses the bismuth phase | 0.02 – 0.1 | 0.05 |
| Pblow-lead limit for potable water service | ≤ 0.2 | 0.09 |
| Niincl. Co | ≤ 1 | — |
| Fe | ≤ 0.3 | — |
| Sb | ≤ 0.25 | — |
| S | ≤ 0.08 | — |
| P | ≤ 0.05 | — |
| Al | ≤ 0.01 | — |
| Si | ≤ 0.01 | — |
| Zn | ≥ 12 (balance) | — |
C89844-M02 — frequently asked
What is C89844-M02 used for?
C89844-M02 is typically used for potable water fittings, meter bodies and valve components. In short: machinability rating of 80; bismuth–selenium lead-free bronze; low-lead plumbing castings.
What is the yield strength of C89844-M02?
C89844-M02 has a typical yield strength of 120 MPa (17.4 ksi) and a tensile strength of 265 MPa (38.4 ksi) — weaker than 79% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is C89844-M02 easy to machine?
Yes — machinability is rated very good (80/100, better than 86% of copper alloy grades). Machines like a leaded red brass at roughly 80 % of C36000 — use sharp positive-rake tooling, higher feed to break the shorter chip, and avoid dwell that smears the bismuth phase.
Can C89844-M02 be welded?
Not readily — weldability is rated poor (30/100). Fusion welding is not recommended (bismuth grain-boundary films cause hot cracking); join by soldering or silver brazing with low-temperature, short-dwell cycles.
What surface finishes work on C89844-M02?
Buffs and polishes well and accepts standard Ni/Cr and PVD decorative plating; pickle carefully since bismuth-rich surface layers can etch preferentially.
Can C89844-M02 be formed, bent or molded?
Foundry alloy only: pour 1050–1120 °C, use good risering and chills as the freezing range is wide; not intended for cold or hot working.
What is the maximum service temperature of C89844-M02?
C89844-M02 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C89844-M01 and C89844-M07?
M01 is the default condition — standard as-cast sand casting condition for valve bodies and plumbing fittings; most widely stocked/produced form. M07: continuous-cast bar/tube stock for screw-machined low-lead plumbing components; finest grain and highest yield strength. Yield strength is 110 MPa in M01 versus 150 MPa in M07.
Sources
- ASTM B584 — Copper Alloy Sand Castings for General Applications — ASTM International (2022)
- ASTM B763 — Copper Alloy Sand Castings for Valve Applications — ASTM International (2020)
- CDA Alloy Database — C89844 bismuth-selenium copper alloy — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties of Copper and Copper Alloys (cast) — ASM International (1990)
- Federalloy bismuth-selenium no-lead casting alloys — The Federal Metal Company (2021)
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.