Copper Alloy C64200 · supply condition · default condition
Copper Alloy C64200-HR50
Properties of the HR50 condition, compared with the other C64200 tempers.
Standard stocked rod/bar temper: high strength with low residual stress for valve stems and machined fittings.
What is C64200-HR50?
C64200-HR50 is C64200 supplied in the HR50 condition — standard stocked rod/bar temper: high strength with low residual stress for valve stems and machined fittings. C64200-HR50 has a yield strength of 370 MPa (53.7 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 75% of copper alloy grades. Elongation at break is 32% and the elastic modulus is 117 GPa (17 Msi). C64200-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).
Advantages
- Lightweight — 7.69 g/cm³ (0.278 lb/in³), better than 90% of copper alloy grades
- High service temperature — 300°C (572 °F), better than 84% of copper alloy grades
- Good corrosion resistance — 72/100, better than 84% of copper alloy grades
- Readily welded — 70/100, better than 84% of copper alloy grades
- Ductile — tolerates forming and impact — 32%, better than 76% of copper alloy grades
Limitations
- Low electrical conductivity — 7 % IACS, worse than 86% of copper alloy grades
- Poor heat conductor — 45 W/m·K (26 BTU/hr·ft·°F), worse than 76% of copper alloy grades
C64200-HR50 properties
Typical room-temperature values for C64200-HR50 — 10 properties are specific to this condition; the rest are grade-level values shared by every C64200 temper. Each bar shows where the value sits among the copper alloy grades in FabDigit's library — further right is higher.
Physical3
C64200-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).
Mechanical12
C64200-HR50 has a yield strength of 370 MPa (53.7 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 75% of copper alloy grades. Elongation at break is 32% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C64200-HR50 is rated for continuous service to 300°C (572 °F). It conducts heat at 45 W/m·K (26 BTU/hr·ft·°F), worse than 76% of copper alloy grades. Thermal expansion is 18 µm/m·K (10 µin/in·°F).
Electrical3
C64200-HR50 conducts electricity at 7 % IACS, worse than 86% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), better than 84% of copper alloy grades.
Sustainability4
Producing a kilogram of C64200-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 40%.
Manufacturability8
C64200-HR50's machinability is good (55/100, better than 72% of copper alloy grades); weldability very good (70/100); formability fair (45/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other C64200 tempers and conditions
C64200 is also supplied in 6 other conditions. The full side-by-side table is on the C64200 overview.
- HR50DefaultStandard stocked rod/bar temper: high strength with low residual stress for valve stems and machined fittings.370 MPa yield · 180 HB
- H04Highest-strength drawn rod/wire for fasteners, studs and wear-loaded pins; lower ductility and higher residual stress.415 MPa yield · 200 HB
- M10Hot-forged C64200 aluminium-silicon bronze cooled in still air, giving a moderately strong, tough, corrosion-resistant forging temper.270 MPa yield · 150 HB
Working with C64200-HR50
Is C64200 easy to machine?
Best of the aluminium bronzes to machine (≈60 % of C36000): use sharp carbide, positive rake, high feed with light depth to break the tough chip, and flood coolant.
Can C64200 be welded?
Good with GTAW/GMAW using ECuAl-A2 or matching Cu-Al-Si filler, argon shield, preheat 100–150 °C on heavy sections; keep interpass low and avoid oxyfuel because of the refractory oxide.
Can C64200 be formed, bent or molded?
Hot works readily at 750–870 °C (forge, extrude, upset); cold formability is only fair — bend generously in O60 and interanneal between heavy draws.
What surface finishes work on C64200?
Not anodisable; take a bright polish, accepts chemical blackening/patination, nickel or chrome plating after thorough oxide removal, and needs no coating for seawater service.
C64200 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 | 1.9 |
| Fe | ≤ 0.3 | 0.15 |
| Zn | ≤ 0.5 | — |
| Sn | ≤ 0.2 | — |
| Mn | ≤ 0.1 | — |
| Nimax (incl. Co) | ≤ 0.25 | — |
| Pb | ≤ 0.05 | — |
| Curemainder, Cu + named elements ≥ 99.5 %; Ag counted as Cu | ≥ 88 (balance) | — |
C64200-HR50 — frequently asked
What is C64200-HR50 used for?
C64200-HR50 is typically used for valve stems, gears and marine hardware. In short: wear resistant silicon bronze.
What is the yield strength of C64200-HR50?
C64200-HR50 has a typical yield strength of 370 MPa (53.7 ksi) and a tensile strength of 690 MPa (100 ksi) — stronger than 75% of copper alloy grades. Strength varies by condition: see the 7 listed tempers.
Is C64200-HR50 easy to machine?
Reasonably — machinability is rated good (55/100, better than 72% of copper alloy grades). Best of the aluminium bronzes to machine (≈60 % of C36000): use sharp carbide, positive rake, high feed with light depth to break the tough chip, and flood coolant.
Can C64200-HR50 be welded?
Yes — weldability is rated very good (70/100). Good with GTAW/GMAW using ECuAl-A2 or matching Cu-Al-Si filler, argon shield, preheat 100–150 °C on heavy sections; keep interpass low and avoid oxyfuel because of the refractory oxide.
What surface finishes work on C64200-HR50?
Not anodisable; take a bright polish, accepts chemical blackening/patination, nickel or chrome plating after thorough oxide removal, and needs no coating for seawater service.
Can C64200-HR50 be formed, bent or molded?
Hot works readily at 750–870 °C (forge, extrude, upset); cold formability is only fair — bend generously in O60 and interanneal between heavy draws.
What is the maximum service temperature of C64200-HR50?
C64200-HR50 is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C64200-HR50 and C64200-O60?
HR50 is the default condition — standard stocked rod/bar temper: high strength with low residual stress for valve stems and machined fittings. O60: pick for maximum ductility when heading, bending or deep forming before final machining. Yield strength is 370 MPa in HR50 versus 205 MPa in O60.
Can FabDigit make parts in C64200-HR50?
Yes — C64200-HR50 is available for CNC machining and sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- Copper Alloy C64200 alloy data sheet — Copper Development Association (copper.org) (2023)
- ASTM B150/B150M — Aluminum Bronze Rod, Bar and Shapes — ASTM International (2019)
- ASTM B601 — Temper Designations for Copper and Copper Alloys — ASTM International (2019)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Aluminum Bronze C642 bar datasheet — Farmers Copper / Concast Metal Products (2022)
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.