Copper Alloy C84400 · finish state · default condition
Copper Alloy C84400 As Cast
Properties of the As Cast condition, compared with the other C84400 tempers.
Standard ASTM B584 sand-cast condition — the way virtually all C84400 valve bodies and fittings are supplied.
What is C84400 As Cast?
C84400 As Cast is C84400 supplied in the As Cast condition — standard ASTM B584 sand-cast condition — the way virtually all C84400 valve bodies and fittings are supplied. C84400 As Cast has a yield strength of 110 MPa (16 ksi) and a tensile strength of 234 MPa (33.9 ksi) — weaker than 81% of copper alloy grades. Elongation at break is 26% and the elastic modulus is 95 GPa (13.8 Msi). C84400 As Cast has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 58% of copper alloy grades. It melts at 843°C (1,549 °F).
Advantages
- Easy to machine — 90/100, better than 98% of copper alloy grades
- Low embodied carbon — 3.2 kg CO₂/kg, better than 93% of copper alloy grades
Limitations
- Low stiffness — 95 GPa (13.8 Msi), worse than 93% of copper alloy grades
- Hard to polish — 60/100, worse than 92% of copper alloy grades
- Limited formability — 10/100, worse than 91% of copper alloy grades
- Difficult to weld — 20/100, worse than 88% of copper alloy grades
- Low strength — 110 MPa (16 ksi), worse than 81% of copper alloy grades
C84400 As Cast properties
Typical room-temperature values for C84400 As Cast — 10 properties are specific to this condition; the rest are grade-level values shared by every C84400 temper. Each bar shows where the value sits among the copper alloy grades in FabDigit's library — further right is higher.
Physical3
C84400 As Cast has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 58% of copper alloy grades. It melts at 843°C (1,549 °F).
Mechanical13
C84400 As Cast has a yield strength of 110 MPa (16 ksi) and a tensile strength of 234 MPa (33.9 ksi) — weaker than 81% of copper alloy grades. Elongation at break is 26% and the elastic modulus is 95 GPa (13.8 Msi).
Thermal6
C84400 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
C84400 As Cast conducts electricity at 16.4 % 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 C84400 As Cast takes about 42 MJ of energy and emits 3.2 kg of CO₂ — less than 99% of copper alloy grades. Typical recycled content is 85%.
Manufacturability8
C84400 As Cast's machinability is excellent (90/100, better than 98% of copper alloy grades); weldability poor (20/100); formability not recommended (10/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other C84400 tempers and conditions
C84400 is also supplied in 2 other conditions. The full side-by-side table is on the C84400 overview.
- As CastDefaultStandard ASTM B584 sand-cast condition — the way virtually all C84400 valve bodies and fittings are supplied.110 MPa yield · 55 HB
Working with C84400 As Cast
Is C84400 easy to machine?
Excellent free-machining behaviour (≈90 % of C36000) — lead gives short chips; use sharp positive-rake tools, high speed, light feed and flood coolant, and observe lead-dust/OSHA controls.
Can C84400 be welded?
Poor fusion weldability because of lead volatilisation and hot cracking; join by soft soldering (excellent) or silver brazing (fair-good), and repair porosity with brazing rather than TIG.
Can C84400 be formed, bent or molded?
Casting-only alloy: excellent sand, permanent-mould and continuous-cast fluidity with good pressure tightness; not suited to cold forming or hot working.
What surface finishes work on C84400?
Cannot be anodised; take mechanical polish, tin, nickel or chrome plating (tin plating common for water-service interiors), or chemical patina/lacquer for decorative parts.
C84400 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 |
|---|---|---|
| CuASTM B584 C84400 | 78 – 82 | 81 |
| Sn | 2.3 – 3.5 | 3 |
| Pbnot for lead-free potable-water service | 6 – 8 | 7 |
| Fe | ≤ 0.4 | — |
| Sb | ≤ 0.25 | — |
| Niincl. Co | ≤ 1 | — |
| S | ≤ 0.08 | — |
| P | ≤ 0.02 | — |
| Al | ≤ 0.01 | — |
| Si | ≤ 0.01 | — |
| Zn | ≥ 7 (balance) | — |
C84400 As Cast — frequently asked
What is C84400 As Cast used for?
C84400 As Cast is typically used for bushings, bearings and pump impellers. In short: acid-proof bronze.
What is the yield strength of C84400 As Cast?
C84400 As Cast has a typical yield strength of 110 MPa (16 ksi) and a tensile strength of 234 MPa (33.9 ksi) — weaker than 81% of copper alloy grades. Strength varies by condition: see the 3 listed tempers.
Is C84400 As Cast easy to machine?
Yes — machinability is rated excellent (90/100, better than 98% of copper alloy grades). Excellent free-machining behaviour (≈90 % of C36000) — lead gives short chips; use sharp positive-rake tools, high speed, light feed and flood coolant, and observe lead-dust/OSHA controls.
Can C84400 As Cast be welded?
Not readily — weldability is rated poor (20/100). Poor fusion weldability because of lead volatilisation and hot cracking; join by soft soldering (excellent) or silver brazing (fair-good), and repair porosity with brazing rather than TIG.
What surface finishes work on C84400 As Cast?
Cannot be anodised; take mechanical polish, tin, nickel or chrome plating (tin plating common for water-service interiors), or chemical patina/lacquer for decorative parts.
Can C84400 As Cast be formed, bent or molded?
Casting-only alloy: excellent sand, permanent-mould and continuous-cast fluidity with good pressure tightness; not suited to cold forming or hot working.
What is the maximum service temperature of C84400 As Cast?
C84400 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 C84400 As Cast?
Yes — C84400 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 — Copper-Base Alloy Centrifugal Castings — ASTM International (2020)
- CDA Alloy Datasheet C84400 — Copper Development Association (copper.org) (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.