Copper Alloy C84200-M02
Heat-treated state
UNS C84200
M02 = as centrifugally cast
Choose for rings, bushings and flanged sleeves needing a denser, more pressure-tight wall than sand casting.
Values for the M02 condition
Other C84200 tempers and conditions
C84200 is listed in 5 conditions; see the grade overview at C84200.
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, fittings and general plumbing hardware. | 103 | 241 | 27 | 55 HB | 16.4 % IACS |
As investment cast | Investment-cast condition for small complex near-net-shape parts with tight tolerances. | 103 | 241 | 25 | 55 HB | 16.4 % IACS |
M02This page As centrifugally cast | Choose for rings, bushings and flanged sleeves needing a denser, more pressure-tight wall than sand casting. | 110 | 255 | 25 | 58 HB | 16.4 % IACS |
As plaster cast | For higher-volume small fittings where finer chill structure gives slightly higher strength and better surface. | 110 | 255 | 24 | 58 HB | 16.4 % IACS |
As continuous cast | Continuous-cast bar/tube stock — densest, most uniform structure and the best choice for machined-from-solid fittings. | 124 | 262 | 20 | 60 HB | 16.4 % IACS |
What is C84200-M02?
C84200-M02 is C84200 heat treated to M02 — choose for rings, bushings and flanged sleeves needing a denser, more pressure-tight wall than sand casting. C84200-M02 has a yield strength of 110 MPa (16 ksi) and a tensile strength of 255 MPa (37 ksi) — weaker than 82% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 95 GPa (13.8 Msi). C84200-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
- Difficult to weld — 20/100, worse than 88% of copper alloy grades
- Hard to polish — 65/100, worse than 87% of copper alloy grades
- Low strength — 110 MPa (16 ksi), worse than 82% of copper alloy grades
- Limited formability — 15/100, worse than 79% of copper alloy grades
C84200-M02 properties
Typical room-temperature values for C84200-M02; 19 are specific to this condition. Other listed values are C84200 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C84200-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).
Mechanical13
C84200-M02 has a yield strength of 110 MPa (16 ksi) and a tensile strength of 255 MPa (37 ksi) — weaker than 82% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 95 GPa (13.8 Msi).
Thermal6
C84200-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 18 µm/m·K (10 µin/in·°F).
Electrical3
C84200-M02 conducts electricity at 16.4 % IACS, worse than 51% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (63/100), better than 52% of copper alloy grades.
Sustainability4
Producing a kilogram of C84200-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 85%.
Manufacturability8
C84200-M02's machinability is very good (80/100, better than 86% of copper alloy grades); weldability poor (20/100); formability poor (15/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C84200-M02
Is C84200 easy to machine?
Excellent free-machining behaviour (≈80 % of C36000); use sharp positive-rake carbide or HSS tooling, high speed, light feeds, and expect short chips from the lead phase.
Can C84200 be welded?
Fusion welding is not recommended — lead causes hot cracking and zinc fumes; join by soft soldering (excellent) or silver brazing with low-temperature filler and good ventilation.
Can C84200 be formed, bent or molded?
Foundry alloy only: good fluidity for thin plumbing sections, moderate shrinkage (~1.5 %), needs adequate risering and clean, degassed melt to avoid tin-oxide dross and micro-porosity.
What surface finishes work on C84200?
Takes electroplated nickel/chrome and tin plate readily, buffs to a bright brass finish (lead phase limits true mirror polish); lacquer or chromate to prevent tarnish — anodizing not applicable.
C84200 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 % | 78 – 82 | 80 |
| Sn | 4 – 6 | 5 |
| Pb | 2 – 3 | 2.5 |
| Niincluding Co | ≤ 0.8 | — |
| Fe | ≤ 0.4 | — |
| Sb | ≤ 0.25 | — |
| S | ≤ 0.08 | — |
| P | ≤ 0.02 | — |
| Al | ≤ 0.01 | — |
| Si | ≤ 0.01 | — |
| Zn | ≥ 10 (balance) | — |
C84200-M02 — frequently asked
What is C84200-M02 used for?
C84200-M02 is typically used for valves, fittings and pump housings. In short: high-lead semi-red brass; good thin-section fluidity; not fusion weldable.
What is the yield strength of C84200-M02?
C84200-M02 has a typical yield strength of 110 MPa (16 ksi) and a tensile strength of 255 MPa (37 ksi) — weaker than 82% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is C84200-M02 easy to machine?
Yes — machinability is rated very good (80/100, better than 86% of copper alloy grades). Excellent free-machining behaviour (≈80 % of C36000); use sharp positive-rake carbide or HSS tooling, high speed, light feeds, and expect short chips from the lead phase.
Can C84200-M02 be welded?
Not readily — weldability is rated poor (20/100). Fusion welding is not recommended — lead causes hot cracking and zinc fumes; join by soft soldering (excellent) or silver brazing with low-temperature filler and good ventilation.
What surface finishes work on C84200-M02?
Takes electroplated nickel/chrome and tin plate readily, buffs to a bright brass finish (lead phase limits true mirror polish); lacquer or chromate to prevent tarnish — anodizing not applicable.
Can C84200-M02 be formed, bent or molded?
Foundry alloy only: good fluidity for thin plumbing sections, moderate shrinkage (~1.5 %), needs adequate risering and clean, degassed melt to avoid tin-oxide dross and micro-porosity.
What is the maximum service temperature of C84200-M02?
C84200-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 C84200-M01 and C84200-M07?
M01 is the default condition — standard as-cast sand casting condition for valve bodies, fittings and general plumbing hardware. M07: continuous-cast bar/tube stock — densest, most uniform structure and the best choice for machined-from-solid fittings. Yield strength is 103 MPa in M01 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)
- CDA Alloy Database — C84200 semi-red brass — Copper Development Association (2023)
- 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.