Copper Alloy C84000-M02
Heat-treated state
UNS C84000
M02 = as centrifugally cast
Pick for rings, sleeves and bushings needing sounder, denser wall sections than sand casting.
Values for the M02 condition
Other C84000 tempers and conditions
C84000 is listed in 4 conditions; see the grade overview at C84000.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
M01-FDefault M01 As-Cast | Standard sand-cast condition for valve bodies, fittings and low-pressure housings. | 97 | 234 | 26 | 55 HB | 16.4 % IACS |
M02This page As centrifugally cast | Pick for rings, sleeves and bushings needing sounder, denser wall sections than sand casting. | 105 | 245 | 22 | 58 HB | 16.4 % IACS |
As plaster cast | Higher-volume fittings needing better surface finish, tighter tolerance and finer grain than sand casting. | 110 | 250 | 20 | 60 HB | 16.4 % IACS |
As continuous cast | Choose for machined-from-bar fittings and bushings: densest, most pressure-tight and highest-strength form. | 124 | 262 | 20 | 62 HB | 16.4 % IACS |
What is C84000-M02?
C84000-M02 is C84000 heat treated to M02 — pick for rings, sleeves and bushings needing sounder, denser wall sections than sand casting. C84000-M02 has a yield strength of 105 MPa (15.2 ksi) and a tensile strength of 245 MPa (35.5 ksi) — weaker than 85% of copper alloy grades. Elongation at break is 22% and the elastic modulus is 90 GPa (13.1 Msi). C84000-M02 has a density of 8.55 g/cm³ (0.309 lb/in³), lighter than 60% of copper alloy grades. It melts at 845°C (1,553 °F). M01-F is the default condition FabDigit quotes; M02 is available on request or by drawing note.
Advantages
- Easy to machine — 90/100, better than 98% of copper alloy grades
Limitations
- Low stiffness — 90 GPa (13.1 Msi), worse than 95% of copper alloy grades
- Hard to polish — 60/100, worse than 92% of copper alloy grades
- Limited formability — 10/100, worse than 89% of copper alloy grades
- Difficult to weld — 20/100, worse than 88% of copper alloy grades
- Low strength — 105 MPa (15.2 ksi), worse than 85% of copper alloy grades
C84000-M02 properties
Typical room-temperature values for C84000-M02; 21 are specific to this condition. Other listed values are C84000 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C84000-M02 has a density of 8.55 g/cm³ (0.309 lb/in³), lighter than 60% of copper alloy grades. It melts at 845°C (1,553 °F).
Mechanical15
C84000-M02 has a yield strength of 105 MPa (15.2 ksi) and a tensile strength of 245 MPa (35.5 ksi) — weaker than 85% of copper alloy grades. Elongation at break is 22% and the elastic modulus is 90 GPa (13.1 Msi).
Thermal6
C84000-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 µm/m·K (11.1 µin/in·°F).
Electrical3
C84000-M02 conducts electricity at 16.4 % IACS, worse than 51% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (56/100), worse than 81% of copper alloy grades.
Sustainability4
Producing a kilogram of C84000-M02 takes about 55 MJ of energy and emits 3.4 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 85%.
Manufacturability8
C84000-M02's machinability is excellent (90/100, better than 98% of copper alloy grades); weldability poor (20/100); formability not recommended (10/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C84000-M02
Is C84000 easy to machine?
Excellent free-machining behaviour (~90 % of C36000) — use sharp positive-rake tools, high speeds, light feeds; chips break short thanks to the lead phase.
Can C84000 be welded?
Not recommended for fusion welding (lead-induced hot cracking); repair by brazing or soft soldering, and solder/braze with flux suited to zinc-bearing alloys.
Can C84000 be formed, bent or molded?
A casting alloy only — good fluidity and pressure tightness in sand, permanent-mould, centrifugal and continuous casting; not cold formable.
What surface finishes work on C84000?
Takes nickel/chrome electroplate and tin coatings well; polish to a satin-to-bright finish, then lacquer or benzotriazole-passivate to slow tarnish; anodizing does not apply.
C84000 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 copper range; confirm against purchase spec — C84000 is not currently listed in ASTM B584, nearest registered analogues are C83800 and C84400 | 80 – 83 | 82 |
| Sn | 2 – 3.5 | 3 |
| Pbfree-machining and pressure-tightness addition; restricted for potable water | 4 – 6.5 | 5.5 |
| Feimpurity limit | ≤ 0.4 | 0.15 |
| Niincl. Co, impurity limit | ≤ 1 | 0.3 |
| Sbimpurity limit | ≤ 0.25 | — |
| Pimpurity limit | ≤ 0.05 | — |
| Simpurity limit | ≤ 0.08 | — |
| Alkept low to avoid casting defects | ≤ 0.01 | — |
| Siimpurity limit | ≤ 0.01 | — |
| Znbalance, typically 8–11 % | balance | — |
C84000-M02 — frequently asked
What is C84000-M02 used for?
C84000-M02 is typically used for plumbing fittings, valve components and general hardware castings. In short: free-machining semi-red brass; about 90 % of C36000; casting alloy only.
What is the yield strength of C84000-M02?
C84000-M02 has a typical yield strength of 105 MPa (15.2 ksi) and a tensile strength of 245 MPa (35.5 ksi) — weaker than 85% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C84000-M02 easy to machine?
Yes — machinability is rated excellent (90/100, better than 98% of copper alloy grades). Excellent free-machining behaviour (~90 % of C36000) — use sharp positive-rake tools, high speeds, light feeds; chips break short thanks to the lead phase.
Can C84000-M02 be welded?
Not readily — weldability is rated poor (20/100). Not recommended for fusion welding (lead-induced hot cracking); repair by brazing or soft soldering, and solder/braze with flux suited to zinc-bearing alloys.
What surface finishes work on C84000-M02?
Takes nickel/chrome electroplate and tin coatings well; polish to a satin-to-bright finish, then lacquer or benzotriazole-passivate to slow tarnish; anodizing does not apply.
Can C84000-M02 be formed, bent or molded?
A casting alloy only — good fluidity and pressure tightness in sand, permanent-mould, centrifugal and continuous casting; not cold formable.
What is the maximum service temperature of C84000-M02?
C84000-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 C84000 M01-F and C84000-M07?
M01-F is the default condition — standard sand-cast condition for valve bodies, fittings and low-pressure housings. M07: choose for machined-from-bar fittings and bushings: densest, most pressure-tight and highest-strength form. Yield strength is 97 MPa in M01-F versus 124 MPa in M07.
Sources
- ASTM B584 — Standard Specification for Copper Alloy Sand Castings for General Applications — ASTM International (2022)
- ASTM B505/B505M — Copper Alloy Continuous Castings — ASTM International (2018)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (cast copper alloys) — ASM International (1990)
- Copper Alloy Data — cast leaded red and semi-red brasses (C838xx / C844xx family) — Copper Development Association (copper.org) (2023)
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.