Copper Alloy C64210-H04
Supply condition · default condition
UNS C64210 · ASTM B150
H04 = full hard
Default stocked condition: cold-drawn rod for bolts, studs, shafts and marine fasteners needing high strength with good machinability.
Values for the H04 condition
Other C64210 tempers and conditions
C64210 is listed in 6 conditions; see the grade overview at C64210.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Pick for maximum ductility when parts are cold-headed, bent or upset before final sizing. | 205 | 483 | 35 | 130 HB | 7.5 % IACS |
As hot extruded | Lowest-cost mill condition for large-diameter bar that will be fully machined. | 240 | 517 | 32 | 150 HB | 7 % IACS |
As hot forged and air cooled | Standard condition for hot die forgings where a good strength/ductility balance and no post-forge quench line are wanted. | 250 | 552 | 30 | 150 HB | 7 % IACS |
As forged and quenched | Pick when forgings need higher strength and hardness than air-cooled M10, accepting somewhat lower elongation. | 275 | 586 | 25 | 165 HB | 7 % IACS |
H04DefaultThis page Full hard | Default stocked condition: cold-drawn rod for bolts, studs, shafts and marine fasteners needing high strength with good machinability. | 393 | 655 | 22 | 180 HB | 7 % IACS |
Drawn and stress-relieved rod | Use where the highest yield strength and straightness are needed and residual stress must be reduced before machining or service. | 430 | 690 | 18 | 11 HRC | 7 % IACS |
What is C64210-H04?
C64210-H04 is C64210 supplied in the H04 condition — default stocked condition: cold-drawn rod for bolts, studs, shafts and marine fasteners needing high strength with good machinability. C64210-H04 has a yield strength of 393 MPa (57 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 78% of copper alloy grades. Elongation at break is 22% and the elastic modulus is 117 GPa (17 Msi). C64210-H04 has a density of 7.69 g/cm³ (0.278 lb/in³), lighter than 90% of copper alloy grades. It melts at 1,027°C (1,881 °F).
Advantages
- Good corrosion resistance — 76/100, better than 91% of copper alloy grades
- Lightweight — 7.69 g/cm³ (0.278 lb/in³), better than 90% of copper alloy grades
- High strength — 393 MPa (57 ksi), better than 78% of copper alloy grades
- Readily welded — 62/100, better than 78% of copper alloy grades
- High service temperature — 260°C (500 °F), better than 75% of copper alloy grades
Limitations
- Low electrical conductivity — 7 % IACS, worse than 86% of copper alloy grades
- Poor heat conductor — 44 W/m·K (25.4 BTU/hr·ft·°F), worse than 78% of copper alloy grades
C64210-H04 properties
Typical room-temperature values for C64210-H04; 21 are specific to this condition. Other listed values are C64210 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C64210-H04 has a density of 7.69 g/cm³ (0.278 lb/in³), lighter than 90% of copper alloy grades. It melts at 1,027°C (1,881 °F).
Mechanical15
C64210-H04 has a yield strength of 393 MPa (57 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 78% of copper alloy grades. Elongation at break is 22% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C64210-H04 is rated for continuous service to 260°C (500 °F). It conducts heat at 44 W/m·K (25.4 BTU/hr·ft·°F), worse than 78% of copper alloy grades. Thermal expansion is 18 µm/m·K (10 µin/in·°F).
Electrical3
C64210-H04 conducts electricity at 7 % IACS, worse than 86% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (76/100), better than 91% of copper alloy grades.
Sustainability4
Producing a kilogram of C64210-H04 takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 35%.
Manufacturability8
C64210-H04's machinability is good (55/100, better than 71% of copper alloy grades); weldability good (62/100); formability fair (40/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C64210-H04
Is C64210 easy to machine?
Machines like a tough medium-carbon steel at ~60 % of AISI 1212 — use sharp positive-rake carbide, rigid setups, moderate speeds and generous coolant to avoid work-hardened, gummy chips.
Can C64210 be welded?
GTAW/GMAW with matching aluminium-bronze filler (ERCuAl-A2) works well; keep interpass temperature low, avoid oxy-fuel and heavy oxide entrapment, and clean the alumina film mechanically before welding.
Can C64210 be formed, bent or molded?
Hot forge/extrude at 750–875 °C (M10 air-cooled or M11 quenched); cold bending and heading are best done in O60 temper since H04 rod has limited remaining ductility.
What surface finishes work on C64210?
Takes a bright mechanical polish and holds a golden hue; not anodizable — specify chemical blackening, passivation, or nickel/tin plating with a proper activation step to break the alumina film.
C64210 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 |
|---|---|---|
| Al | 6.3 – 7 | 6.7 |
| Si | 1.5 – 2.2 | 1.8 |
| Fe | ≤ 0.3 | — |
| Zn | ≤ 0.5 | — |
| Sn | ≤ 0.2 | — |
| Mn | ≤ 0.1 | — |
| NiNi + Co, max | ≤ 0.25 | — |
| As | ≤ 0.15 | — |
| Cu≈90–92 %, remainder | balance | — |
C64210-H04 — frequently asked
What is C64210-H04 used for?
C64210-H04 is typically used for fasteners, marine hardware and precision machined parts. In short: machinable aluminum-silicon bronze; fastener-grade strength balance; forgeable at 750–875 °C.
What is the yield strength of C64210-H04?
C64210-H04 has a typical yield strength of 393 MPa (57 ksi) and a tensile strength of 655 MPa (95 ksi) — stronger than 78% of copper alloy grades. Strength varies by condition: see the 6 listed tempers.
Is C64210-H04 easy to machine?
Reasonably — machinability is rated good (55/100, better than 71% of copper alloy grades). Machines like a tough medium-carbon steel at ~60 % of AISI 1212 — use sharp positive-rake carbide, rigid setups, moderate speeds and generous coolant to avoid work-hardened, gummy chips.
Can C64210-H04 be welded?
Yes — weldability is rated good (62/100). GTAW/GMAW with matching aluminium-bronze filler (ERCuAl-A2) works well; keep interpass temperature low, avoid oxy-fuel and heavy oxide entrapment, and clean the alumina film mechanically before welding.
What surface finishes work on C64210-H04?
Takes a bright mechanical polish and holds a golden hue; not anodizable — specify chemical blackening, passivation, or nickel/tin plating with a proper activation step to break the alumina film.
Can C64210-H04 be formed, bent or molded?
Hot forge/extrude at 750–875 °C (M10 air-cooled or M11 quenched); cold bending and heading are best done in O60 temper since H04 rod has limited remaining ductility.
What is the maximum service temperature of C64210-H04?
C64210-H04 is rated for continuous use to about 260°C (500 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C64210-H04 and C64210-O60?
H04 is the default condition — default stocked condition: cold-drawn rod for bolts, studs, shafts and marine fasteners needing high strength with good machinability. O60: pick for maximum ductility when parts are cold-headed, bent or upset before final sizing. Yield strength is 393 MPa in H04 versus 205 MPa in O60.
Sources
- ASTM B150/B150M — Aluminum Bronze Rod, Bar, and Shapes — ASTM International (2019)
- ASTM B283/B283M — Copper and Copper-Alloy Die Forgings (Hot Pressed) — ASTM International (2020)
- Copper Alloy C64200/C64210 alloy data — 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.