Copper Alloy C64210
UNS C64210 · ASTM B150
C64210 is a modified aluminum-silicon bronze to ASTM B150, close to C64200 but with composition adjusted to balance strength and machinability in fastener and rod stock; it is offered in O60, M30, M10, M11, H04 and HR50 conditions.
Reference datasheet — C64210 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the H04 condition
C64210 tempers and conditions
C64210 is supplied in 6 conditions, soft to hard. H04 is the default FabDigit quotes; the values on this page are for it.
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 |
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?
C64210 is a modified aluminum-silicon bronze to ASTM B150, close to C64200 but with composition adjusted to balance strength and machinability in fastener and rod stock; it is offered in O60, M30, M10, M11, H04 and HR50 conditions. Default properties are 393 MPa yield, 655 MPa tensile, 22 % elongation and 180 HB (85 HRB), with a formability score of 40. It machines at roughly 60 % of AISI 1212 and is not anodizable, so plan on carbide tooling and chemical or plated finishes. Use C63600 when heavy cold heading dominates. C64210 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). C64210 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).
What is C64210 used for?
- fasteners
- marine hardware
- precision machined parts
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 properties
Typical room-temperature values for C64210-H04; bars are the position among copper alloy grades.
Physical3
C64210 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 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 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 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 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'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. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the copper alloy family
Yield strength against density for every copper alloy grade FabDigit runs. C64210 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C64210
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.
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 |
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.
Surface treatments FabDigit runs on copper alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Equivalent designations
Standards and trade names that resolve to Copper Alloy C64210 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B150
How much does C64210 cost?
C64210 is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
C64210 — frequently asked
What is C64210 used for?
C64210 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?
C64210 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 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 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?
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 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?
C64210 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.
How much does C64210 cost?
C64210 is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.