Copper Alloy C84000
UNS C84000
C84000 is a leaded semi-red brass casting alloy from the C83000–C89999 cast brass family, with a balanced copper–zinc–tin–lead chemistry and a free-machining lead phase.
Reference datasheet — C84000 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-F condition
C84000 tempers and conditions
C84000 is supplied in 4 conditions, soft to hard. M01-F is the default FabDigit quotes; the values on this page are for it.
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 |
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?
C84000 is a leaded semi-red brass casting alloy from the C83000–C89999 cast brass family, with a balanced copper–zinc–tin–lead chemistry and a free-machining lead phase. It is chosen for good castability and pressure tightness in plumbing fittings and general hardware, typically at 234 MPa tensile, 97 MPa yield, 26 % elongation and 55 HB in the as-cast condition. Lead prevents fusion welding, and continuous service is limited to about 200 °C. C83600 is the nearest alternative where the standard 85-5-5-5 chemistry is specified. C84000 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). C84000 has a yield strength of 97 MPa (14.1 ksi) and a tensile strength of 234 MPa (33.9 ksi) — weaker than 87% of copper alloy grades. Elongation at break is 26% and the elastic modulus is 90 GPa (13.1 Msi).
What is C84000 used for?
- plumbing fittings
- valve components
- general hardware castings
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
- Difficult to weld — 20/100, worse than 88% of copper alloy grades
- Low strength — 97 MPa (14.1 ksi), worse than 87% of copper alloy grades
C84000 properties
Typical room-temperature values for C84000-M01-F; bars are the position among copper alloy grades.
Physical3
C84000 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 has a yield strength of 97 MPa (14.1 ksi) and a tensile strength of 234 MPa (33.9 ksi) — weaker than 87% of copper alloy grades. Elongation at break is 26% and the elastic modulus is 90 GPa (13.1 Msi).
Thermal6
C84000 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 conducts electricity at 16.4 % IACS, worse than 51% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 86% of copper alloy grades.
Sustainability4
Producing a kilogram of C84000 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's machinability is excellent (90/100, better than 98% of copper alloy grades); weldability poor (20/100); formability poor (30/100).
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. C84000 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C84000
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.
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 |
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.
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 C84000 cost?
C84000 is a premium-cost copper alloy ($$$), cheaper than about 51% 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.
C84000 — frequently asked
What is C84000 used for?
C84000 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?
C84000 has a typical yield strength of 97 MPa (14.1 ksi) and a tensile strength of 234 MPa (33.9 ksi) — weaker than 87% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C84000 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 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?
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 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?
C84000 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.
How much does C84000 cost?
C84000 is a premium-cost copper alloy ($$$), cheaper than about 51% 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)
- 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; 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.