Copper Alloy C64200
UNS C64200 · ASTM B150 · EN CW301G
C64200 is an aluminium-silicon bronze with about 7% Al and 2% Si; the silicon refines the structure and markedly improves machinability and hot working while retaining aluminium-bronze strength (690 MPa tensile, 370 MPa yield) and resistance to seawater and other corrosive media.
Values for the HR50 condition
C64200 tempers and conditions
C64200 is supplied in 7 conditions, soft to hard. HR50 is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Pick for maximum ductility when heading, bending or deep forming before final machining. | 205 | 485 | 35 | 110 HB | 7 % IACS |
As hot rolled | Economical large-diameter bar/shape temper where drawn tolerances and peak strength are not required. | 250 | 550 | 35 | 135 HB | 7 % IACS |
As hot forged and air cooled | Hot-forged C64200 aluminium-silicon bronze cooled in still air, giving a moderately strong, tough, corrosion-resistant forging temper. | 270 | 550 | 28 | 150 HB | 7 % IACS |
As hot extruded | Hot-rolled rod/plate condition for weld-fabricated marine hardware and general machining stock. | 275 | 620 | 32 | 150 HB | 7 % IACS |
As forged and quenched | Hot-forged near-net parts (valve bodies, flanged nuts) machined after forging; properties between hot-rolled and annealed. | 275 | 585 | 30 | 145 HB | 7 % IACS |
HR50Default Extruded and drawn, then stress relieved | Standard stocked rod/bar temper: high strength with low residual stress for valve stems and machined fittings. | 370 | 690 | 32 | 180 HB | 7 % IACS |
Full hard | Highest-strength drawn rod/wire for fasteners, studs and wear-loaded pins; lower ductility and higher residual stress. | 415 | 725 | 22 | 200 HB | 7 % IACS |
What is C64200?
C64200 is an aluminium-silicon bronze with about 7% Al and 2% Si; the silicon refines the structure and markedly improves machinability and hot working while retaining aluminium-bronze strength (690 MPa tensile, 370 MPa yield) and resistance to seawater and other corrosive media. It is normally supplied as extruded and drawn bar (HR50, H04) for valve stems, fasteners, nuts, bushings, flange faces and marine hardware. Cold formability is only fair, the tenacious alumina film makes brazing and soldering difficult, and conductivity of about 7% IACS rules out electrical duty; C63000 is the choice when higher strength is needed. C64200 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). C64200 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).
What is C64200 used for?
- Valve stems
- Gears
- Marine hardware
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 85% of copper alloy grades
- Readily welded — 70/100, better than 85% of copper alloy grades
- Good corrosion resistance — 72/100, better than 84% of copper alloy grades
- Ductile — tolerates forming and impact — 32%, better than 77% 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 properties
Typical room-temperature values for C64200-HR50; bars are the position among copper alloy grades.
Physical3
C64200 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 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 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 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 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's machinability is good (55/100, better than 71% 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.
Strength versus weight in the copper alloy family
Yield strength against density for every copper alloy grade FabDigit runs. C64200 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C64200
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.
Manufacturability
The process limits FabDigit applies to C64200. Every C64200 part is priced by an engineer; design inside these and the quote comes back without a redesign loop.
CNC machining
| Machinability | Good55 / 100 |
|---|---|
| ISO material group | N.5 |
| Cutting speed (rough / finish) | 180 / 220 m/min |
| Minimum wall | 0.8 mm |
| Minimum internal radius | 1 mm |
| Drill depth limit | 6× diameter |
| Best surface (machined / polished) | Ra 1.6 / — |
| Hardenable after machining | No |
Sheet metal
| Formability | Fair45 / 100 |
|---|---|
| Weldability | Better70 / 100 |
| Bendable | Yes |
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) |
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.
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).
Passivation
Plating
Organic Coating
Equivalent designations
Standards and trade names that resolve to Copper Alloy C64200 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B150
- EN / DIN / Werkstoff-Nr.
- CW301G
- Also called
- Aluminum Silicon Bronze
How much does C64200 cost?
C64200 is a specialty-cost copper alloy ($$$$$), pricier than about 58% 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.
C64200 — frequently asked
What is C64200 used for?
C64200 is typically used for valve stems, gears and marine hardware. In short: wear resistant silicon bronze.
What is the yield strength of C64200?
C64200 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 easy to machine?
Reasonably — machinability is rated good (55/100, better than 71% 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 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?
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 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?
C64200 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.
How much does C64200 cost?
C64200 is a specialty-cost copper alloy ($$$$$), pricier than about 58% 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.
Can FabDigit make parts in C64200?
Yes — C64200 is available for CNC machining and sheet metal; every part is priced by an engineer rather than instantly. 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; 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.