Copper Alloy C64210-HR50
Supply condition
UNS C64210 · ASTM B150
HR50 = 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.
Values for the HR50 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 |
H04Default 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 |
HR50This page 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-HR50?
C64210-HR50 is C64210 supplied in the HR50 condition — use where the highest yield strength and straightness are needed and residual stress must be reduced before machining or service. C64210-HR50 has a yield strength of 430 MPa (62.4 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 84% of copper alloy grades. Elongation at break is 18% and the elastic modulus is 117 GPa (17 Msi). C64210-HR50 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). H04 is the default condition FabDigit quotes; HR50 is available on request or by drawing note.
Advantages
- Good corrosion resistance — 78/100, better than 94% of copper alloy grades
- Lightweight — 7.69 g/cm³ (0.278 lb/in³), better than 90% of copper alloy grades
- High strength — 430 MPa (62.4 ksi), better than 84% of copper alloy grades
- Readily welded — 60/100, better than 76% 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-HR50 properties
Typical room-temperature values for C64210-HR50; 22 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-HR50 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-HR50 has a yield strength of 430 MPa (62.4 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 84% of copper alloy grades. Elongation at break is 18% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C64210-HR50 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-HR50 conducts electricity at 7 % IACS, worse than 86% 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 C64210-HR50 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-HR50's machinability is good (55/100, better than 71% of copper alloy grades); weldability good (60/100); formability poor (30/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C64210-HR50
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-HR50 — frequently asked
What is C64210-HR50 used for?
C64210-HR50 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-HR50?
C64210-HR50 has a typical yield strength of 430 MPa (62.4 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 84% of copper alloy grades. Strength varies by condition: see the 6 listed tempers.
Is C64210-HR50 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-HR50 be welded?
Yes — weldability is rated good (60/100). 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-HR50?
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-HR50 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-HR50?
C64210-HR50 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.