Copper Alloy C61000-H04
Supply condition · default condition
UNS C61000
H04 = full hard
Choose the hard, about 35% cold drawn rod or bar, the usual stock condition, for bolts, valve stems and pump shafts needing 320 MPa yield; elongation is down to 25%.
Values for the H04 condition
Other C61000 tempers and conditions
C61000 is listed in 5 conditions; see the grade overview at C61000.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Pick the soft annealed state for deep drawing, cold heading or coil winding where maximum ductility (65% elongation) is required; yield drops to 207 MPa. | 207 | 483 | 65 | 110 HB | 15 % IACS |
As hot extruded | Choose the as-hot-extruded or hot-rolled state for large bars and profiles that will be machined to size: 240 MPa yield with 40% elongation at the lowest cost. | 240 | 550 | 40 | 130 HB | 15 % IACS |
Half hard | Use half-hard, roughly 15% cold drawn stock as a compromise at 275 MPa yield and 40% elongation for fastener and shaft blanks that still need bending or riveting. | 275 | 550 | 40 | 140 HB | 15 % IACS |
H04DefaultThis page Full hard | Choose the hard, about 35% cold drawn rod or bar, the usual stock condition, for bolts, valve stems and pump shafts needing 320 MPa yield; elongation is down to 25%. | 320 | 585 | 25 | 160 HB | 15 % IACS |
Extra hard | Pick the extra-hard, heavily cold drawn wire or rod for springy and wear parts requiring 380 MPa yield and 620 MPa tensile; elongation falls to 15% and forming is restricted. | 380 | 620 | 15 | 175 HB | 15 % IACS |
What is C61000-H04?
C61000-H04 is C61000 supplied in the H04 condition — choose the hard, about 35% cold drawn rod or bar, the usual stock condition, for bolts, valve stems and pump shafts needing 320 MPa yield; elongation is down to 25%. C61000-H04 has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 585 MPa (84.8 ksi) — stronger than 68% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 117 GPa (17 Msi). C61000-H04 has a density of 7.58 g/cm³ (0.274 lb/in³), lighter than 94% of copper alloy grades. It melts at 1,046°C (1,915 °F).
Advantages
- Lightweight — 7.58 g/cm³ (0.274 lb/in³), better than 94% of copper alloy grades
- Good corrosion resistance — 78/100, better than 94% of copper alloy grades
- Readily welded — 75/100, better than 89% of copper alloy grades
C61000-H04 properties
Typical room-temperature values for C61000-H04; 17 are specific to this condition. Other listed values are C61000 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C61000-H04 has a density of 7.58 g/cm³ (0.274 lb/in³), lighter than 94% of copper alloy grades. It melts at 1,046°C (1,915 °F).
Mechanical15
C61000-H04 has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 585 MPa (84.8 ksi) — stronger than 68% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C61000-H04 is rated for continuous service to 250°C (482 °F). It conducts heat at 62.8 W/m·K (36.3 BTU/hr·ft·°F), worse than 57% of copper alloy grades. Thermal expansion is 16.2 µm/m·K (9 µin/in·°F).
Electrical3
C61000-H04 conducts electricity at 15 % IACS, worse than 54% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (78/100), better than 94% of copper alloy grades.
Sustainability4
Producing a kilogram of C61000-H04 takes about 57 MJ of energy and emits 3.8 kg of CO₂ — less than 52% of copper alloy grades. Typical recycled content is 35%.
Manufacturability8
C61000-H04's machinability is poor (30/100, worse than 67% of copper alloy grades); weldability very good (75/100); formability good (55/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C61000-H04
Is C61000 easy to machine?
Machinability is only about 20% (free-cutting brass = 100). Use sharp tools with a large positive rake, low speed with heavy feed and ample coolant; chips are long and tough and tend to stick to the tool.
Can C61000 be welded?
GTAW/GMAW with aluminum-bronze filler (ERCuAl-A2) gives good results, but the alumina film must be removed mechanically or chemically before welding. Oxyacetylene welding and soft soldering are not recommended.
Can C61000 be formed, bent or molded?
The single-phase alpha structure cold-heads, cold-bends and cold-draws well. Hot-work at about 780–900 °C and intermediate-anneal at 600–650 °C followed by rapid cooling.
What surface finishes work on C61000?
Polishes to a high-gloss golden finish and accepts nickel or chrome plating. It cannot be anodized; outdoors, use clear lacquer or a passivation treatment to maintain appearance.
C61000 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 |
|---|---|---|
| Alsingle-phase alpha aluminium bronze | 6 – 8.5 | 7.5 |
| Fe | ≤ 0.5 | 0.25 |
| Si | ≤ 0.1 | — |
| Zn | ≤ 0.2 | — |
| Pb | ≤ 0.02 | — |
| Cusilver counted as copper; balance | ≥ 92 (balance) | — |
C61000-H04 — frequently asked
What is C61000-H04 used for?
C61000-H04 is typically used for fasteners, marine hardware and corrosion-resistant structural parts. In short: weldable aluminum bronze; good cold-heading alpha structure; low machinability rating.
What is the yield strength of C61000-H04?
C61000-H04 has a typical yield strength of 320 MPa (46.4 ksi) and a tensile strength of 585 MPa (84.8 ksi) — stronger than 68% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is C61000-H04 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 67% of copper alloy grades). Machinability is only about 20% (free-cutting brass = 100). Use sharp tools with a large positive rake, low speed with heavy feed and ample coolant; chips are long and tough and tend to stick to the tool.
Can C61000-H04 be welded?
Yes — weldability is rated very good (75/100). GTAW/GMAW with aluminum-bronze filler (ERCuAl-A2) gives good results, but the alumina film must be removed mechanically or chemically before welding. Oxyacetylene welding and soft soldering are not recommended.
What surface finishes work on C61000-H04?
Polishes to a high-gloss golden finish and accepts nickel or chrome plating. It cannot be anodized; outdoors, use clear lacquer or a passivation treatment to maintain appearance.
Can C61000-H04 be formed, bent or molded?
The single-phase alpha structure cold-heads, cold-bends and cold-draws well. Hot-work at about 780–900 °C and intermediate-anneal at 600–650 °C followed by rapid cooling.
What is the maximum service temperature of C61000-H04?
C61000-H04 is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C61000-H04 and C61000-O60?
H04 is the default condition — choose the hard, about 35% cold drawn rod or bar, the usual stock condition, for bolts, valve stems and pump shafts needing 320 MPa yield; elongation is down to 25%. O60: pick the soft annealed state for deep drawing, cold heading or coil winding where maximum ductility (65% elongation) is required; yield drops to 207 MPa. Yield strength is 320 MPa in H04 versus 207 MPa in O60.
Sources
- CDA Alloy Database — C61000 — Copper Development Association (2023)
- ASTM B150/B150M — Aluminum Bronze Rod, Bar and Shapes — ASTM International (2019)
- ASTM B124/B124M — Copper and Copper-Alloy Forging Rod, Bar and Shapes — ASTM International (2020)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
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.