Copper Alloy C84800 · finish state · default condition
Copper Alloy C84800 As Cast
Properties of the As Cast condition, compared with the other C84800 tempers.
Standard stocked condition: sand-cast valve bodies, fittings and general-purpose castings.
What is C84800 As Cast?
C84800 As Cast is C84800 supplied in the As Cast condition — standard stocked condition: sand-cast valve bodies, fittings and general-purpose castings. C84800 As Cast has a yield strength of 124 MPa (18 ksi) and a tensile strength of 262 MPa (38 ksi) — weaker than 77% of copper alloy grades. Elongation at break is 35% and the elastic modulus is 86 GPa (12.5 Msi). C84800 As Cast has a density of 8.55 g/cm³ (0.309 lb/in³), lighter than 61% of copper alloy grades. It melts at 843°C (1,549 °F).
Advantages
- Low embodied carbon — 3 kg CO₂/kg, better than 97% of copper alloy grades
- Easy to machine — 88/100, better than 96% of copper alloy grades
- Ductile — tolerates forming and impact — 35%, better than 79% of copper alloy grades
Limitations
- Hard to polish — 55/100, worse than 97% of copper alloy grades
- Low stiffness — 86 GPa (12.5 Msi), worse than 96% of copper alloy grades
- Difficult to weld — 20/100, worse than 88% of copper alloy grades
- Low strength — 124 MPa (18 ksi), worse than 77% of copper alloy grades
C84800 As Cast properties
Typical room-temperature values for C84800 As Cast — 10 properties are specific to this condition; the rest are grade-level values shared by every C84800 temper. Each bar shows where the value sits among the copper alloy grades in FabDigit's library — further right is higher.
Physical3
C84800 As Cast has a density of 8.55 g/cm³ (0.309 lb/in³), lighter than 61% of copper alloy grades. It melts at 843°C (1,549 °F).
Mechanical10
C84800 As Cast has a yield strength of 124 MPa (18 ksi) and a tensile strength of 262 MPa (38 ksi) — weaker than 77% of copper alloy grades. Elongation at break is 35% and the elastic modulus is 86 GPa (12.5 Msi).
Thermal6
C84800 As Cast 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 53% of copper alloy grades. Thermal expansion is 18 µm/m·K (10 µin/in·°F).
Electrical3
C84800 As Cast conducts electricity at 16 % IACS, worse than 52% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), worse than 76% of copper alloy grades.
Sustainability4
Producing a kilogram of C84800 As Cast takes about 45 MJ of energy and emits 3 kg of CO₂ — less than 97% of copper alloy grades. Typical recycled content is 85%.
Manufacturability5
C84800 As Cast's machinability is excellent (88/100, better than 96% of copper alloy grades); weldability poor (20/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other C84800 tempers and conditions
C84800 is also supplied in 2 other conditions. The full side-by-side table is on the C84800 overview.
- As CastDefaultStandard stocked condition: sand-cast valve bodies, fittings and general-purpose castings.124 MPa yield · 55 HB
Working with C84800 As Cast
Is C84800 easy to machine?
Excellent free-machining behaviour from the lead phase (≈90 % of C36000); use sharp positive-rake tools, light feeds and flood coolant, and observe lead-fume/swarf handling rules.
Can C84800 be welded?
Not suited to fusion welding — lead causes hot cracking; join by soft soldering (excellent) or careful low-temperature brazing, or by mechanical/threaded joints.
Can C84800 be formed, bent or molded?
A casting alloy only: fluid, forgiving in green sand, permanent mould, centrifugal and continuous casting; feed heavy sections well to avoid interdendritic shrinkage and lead sweat.
What surface finishes work on C84800?
Machines to a good matt surface; buffs to moderate lustre only (lead smear, micro-porosity). Takes nickel/chrome electroplating with proper alkaline cleaning; passivation or lacquer prevents tarnish.
C84800 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 |
|---|---|---|
| Cu | 75 – 77 | 76 |
| Sn | 2 – 3 | 2.5 |
| Pb | 5.5 – 7 | 6.2 |
| Niincluding cobalt | ≤ 1 | — |
| Fe | ≤ 0.4 | — |
| Sb | ≤ 0.25 | — |
| S | ≤ 0.08 | — |
| P | ≤ 0.02 | — |
| Al | ≤ 0.01 | — |
| Si | ≤ 0.01 | — |
| Znbalance zinc | ≥ 13 (balance) | — |
C84800 As Cast — frequently asked
What is C84800 As Cast used for?
C84800 As Cast is typically used for low-pressure valve bodies, pipe fittings and flanges, water meter housings, pump housings and covers, pressure-tight plumbing hardware and bushings and bearing sleeves. In short: high-friction wear resistance.
What is the yield strength of C84800 As Cast?
C84800 As Cast has a typical yield strength of 124 MPa (18 ksi) and a tensile strength of 262 MPa (38 ksi) — weaker than 77% of copper alloy grades. Strength varies by condition: see the 3 listed tempers.
Is C84800 As Cast easy to machine?
Yes — machinability is rated excellent (88/100, better than 96% of copper alloy grades). Excellent free-machining behaviour from the lead phase (≈90 % of C36000); use sharp positive-rake tools, light feeds and flood coolant, and observe lead-fume/swarf handling rules.
Can C84800 As Cast be welded?
Not readily — weldability is rated poor (20/100). Not suited to fusion welding — lead causes hot cracking; join by soft soldering (excellent) or careful low-temperature brazing, or by mechanical/threaded joints.
What surface finishes work on C84800 As Cast?
Machines to a good matt surface; buffs to moderate lustre only (lead smear, micro-porosity). Takes nickel/chrome electroplating with proper alkaline cleaning; passivation or lacquer prevents tarnish.
Can C84800 As Cast be formed, bent or molded?
A casting alloy only: fluid, forgiving in green sand, permanent mould, centrifugal and continuous casting; feed heavy sections well to avoid interdendritic shrinkage and lead sweat.
What is the maximum service temperature of C84800 As Cast?
C84800 As Cast 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.
Can FabDigit make parts in C84800 As Cast?
Yes — C84800 As Cast is available for CNC machining with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM B584 — Copper Alloy Sand Castings for General Applications — ASTM International (2022)
- ASTM B505/B505M — Copper Alloy Continuous Castings — ASTM International (2018)
- ASTM B271/B271M — Copper-Base Alloy Centrifugal Castings — ASTM International (2019)
- CDA Alloy Datasheet C84800 (Leaded Semi-Red Brass) — Copper Development Association / copper.org (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — 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.