Copper Alloy C84200
UNS C84200
C84200 is a leaded semi-red brass casting alloy in the C83000–C89999 family, with a higher lead content that raises machinability to roughly 80 % of C36000.
Reference datasheet — C84200 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the M01 condition
C84200 tempers and conditions
C84200 is supplied in 5 conditions, soft to hard. M01 is the default FabDigit quotes; the values on this page are for it.
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 |
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?
C84200 is a leaded semi-red brass casting alloy in the C83000–C89999 family, with a higher lead content that raises machinability to roughly 80 % of C36000. Foundries use it for general-purpose valves, fittings and pump housings, where as-cast values of 241 MPa tensile, 103 MPa yield, 27 % elongation, 55 HB and 16.4 % IACS are typical. It cannot be fusion welded, and solidification shrinkage near 1.5 % calls for adequate risering. Where lead content is restricted, C87500 silicon brass is the usual substitute. C84200 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). C84200 has a yield strength of 103 MPa (14.9 ksi) and a tensile strength of 241 MPa (35 ksi) — weaker than 86% of copper alloy grades. Elongation at break is 27% and the elastic modulus is 95 GPa (13.8 Msi).
What is C84200 used for?
- valves
- fittings
- pump housings
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 — 103 MPa (14.9 ksi), worse than 86% of copper alloy grades
- Limited formability — 15/100, worse than 79% of copper alloy grades
C84200 properties
Typical room-temperature values for C84200-M01; bars are the position among copper alloy grades.
Physical3
C84200 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 has a yield strength of 103 MPa (14.9 ksi) and a tensile strength of 241 MPa (35 ksi) — weaker than 86% of copper alloy grades. Elongation at break is 27% and the elastic modulus is 95 GPa (13.8 Msi).
Thermal6
C84200 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 conducts electricity at 16.4 % IACS, worse than 51% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 57% of copper alloy grades.
Sustainability4
Producing a kilogram of C84200 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's machinability is very good (80/100, better than 86% of copper alloy grades); weldability poor (20/100); formability poor (15/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the copper alloy family
Yield strength against density for every copper alloy grade FabDigit runs. C84200 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C84200
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.
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) |
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.
Surface treatments FabDigit runs on copper alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
How much does C84200 cost?
C84200 is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
C84200 — frequently asked
What is C84200 used for?
C84200 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?
C84200 has a typical yield strength of 103 MPa (14.9 ksi) and a tensile strength of 241 MPa (35 ksi) — weaker than 86% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is C84200 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 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?
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 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?
C84200 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.
How much does C84200 cost?
C84200 is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.