Copper Alloy C62400
UNS C62400 · ASTM B150
C62400 is a high-aluminum wrought bronze at about 11% Al (ASTM B150), where the extra aluminum raises strength and hardness at the cost of ductility.
Reference datasheet — C62400 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 M30 condition
C62400 tempers and conditions
C62400 is supplied in 7 conditions, soft to hard. M30 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 |
|---|---|---|---|---|---|---|
Hot extruded and annealed | Softest supplied condition for extruded rod: lower strength but maximum ductility for subsequent bending, sizing or machining. | 270 | 620 | 20 | 170 HB | — |
Hot rolled and annealed | Annealed flat product for parts that must be machined or lightly formed after rolling. | 270 | 620 | 20 | 170 HB | 8.5 % IACS |
Hot forged and annealed | For closed-die forgings (valve bodies, gear blanks, flanges) supplied annealed to relieve forging stresses. | 275 | 620 | 18 | 175 HB | 8.5 % IACS |
As hot rolled | Choose for hot-rolled plate and flat products where extruded sections are not available. | 300 | 655 | 14 | 185 HB | — |
M30Default As hot extruded | Standard stock condition for C62400 rod and bar per ASTM B150; best combination of strength, toughness and availability. | 310 | 660 | 14 | 190 HB | 8 % IACS |
Quench hardened and temper annealed | Quench from ~870 °C and temper (~600 °C): highest strength and hardness plus refined β structure that greatly improves resistance to dealuminification — preferred for seawater wear parts. | 415 | 760 | 10 | 22 HRC | — |
Drawn and stress relieved | Cold-drawn (light draft) then stress relieved: highest yield strength with straight, close-tolerance bar for shafts and pins. | 450 | 725 | 10 | 205 HB | — |
What is C62400?
C62400 is a high-aluminum wrought bronze at about 11% Al (ASTM B150), where the extra aluminum raises strength and hardness at the cost of ductility. Default values are 310 MPa yield, 660 MPa tensile, 14% elongation and 190 HB (92 HRB), with 8% IACS, a corrosion rating of 78 and service to 300 °C; usual forms are extruded rod, bar and forgings. Machinability (25) and formability (20) are both low, so parts are hot-forged close to net shape and finish-machined. C62300 is easier to machine and form where its lower strength is acceptable. C62400 has a density of 7.45 g/cm³ (0.269 lb/in³), lighter than 99% of copper alloy grades. It melts at 1,015°C (1,859 °F). C62400 has a yield strength of 310 MPa (45 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 64% of copper alloy grades. Elongation at break is 14% and the elastic modulus is 110 GPa (16 Msi).
What is C62400 used for?
- high-strength fasteners
- aerospace fittings
- gears
- structural components
Advantages
- Lightweight — 7.45 g/cm³ (0.269 lb/in³), better than 99% of copper alloy grades
- Good corrosion resistance — 78/100, better than 94% of copper alloy grades
- High service temperature — 300°C (572 °F), better than 85% of copper alloy grades
- Readily welded — 65/100, better than 80% of copper alloy grades
Limitations
- Difficult to machine — 25/100, worse than 86% of copper alloy grades
- Low electrical conductivity — 8 % IACS, worse than 81% of copper alloy grades
C62400 properties
Typical room-temperature values for C62400-M30; bars are the position among copper alloy grades.
Physical3
C62400 has a density of 7.45 g/cm³ (0.269 lb/in³), lighter than 99% of copper alloy grades. It melts at 1,015°C (1,859 °F).
Mechanical13
C62400 has a yield strength of 310 MPa (45 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 64% of copper alloy grades. Elongation at break is 14% and the elastic modulus is 110 GPa (16 Msi).
Thermal6
C62400 is rated for continuous service to 300°C (572 °F). It conducts heat at 46 W/m·K (26.6 BTU/hr·ft·°F), worse than 73% of copper alloy grades. Thermal expansion is 16.2 µm/m·K (9 µin/in·°F).
Electrical3
C62400 conducts electricity at 8 % IACS, worse than 81% 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 C62400 takes about 62 MJ of energy and emits 3.9 kg of CO₂ — more than 76% of copper alloy grades. Typical recycled content is 40%.
Manufacturability8
C62400's machinability is poor (25/100, worse than 86% of copper alloy grades); weldability good (65/100); formability poor (20/100).
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. C62400 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C62400
Is C62400 easy to machine?
Tough, gummy chips — use rigid setups, positive-rake carbide, moderate speed (~60–120 m/min) with heavy soluble-oil flood; rating only ~20 % of free-cutting brass.
Can C62400 be welded?
GTAW/GMAW with matching aluminium-bronze filler (ERCuAl-A2) works well; preheat 150–200 °C on heavy sections, keep interpass low, remove the tenacious alumina film, and re-heat-treat if dealuminification resistance is critical.
Can C62400 be formed, bent or molded?
Hot work at 700–900 °C (forging/extrusion is the normal route); cold formability is poor, so limit cold bending and stress relieve at ~350–400 °C afterwards.
C62400 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 | 10 – 11.5 | 10.8 |
| Fe | 2 – 4.5 | 3.2 |
| Mn | ≤ 0.3 | 0.1 |
| Si | ≤ 0.25 | |
| Ninot specified separately; counted with Co where applicable | — | |
| Pbresidual, typical mill limit | ≤ 0.05 | |
| Curemainder, 86.0 % min per ASTM B150 | ≥ 86 (balance) |
What surface finishes work on C62400?
Polishes to a golden lustre and can be chemically patinated or lacquered; not anodizable, and electroplating requires careful oxide removal/strike layers.
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 C62400 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B150
How much does C62400 cost?
C62400 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.
C62400 — frequently asked
What is C62400 used for?
C62400 is typically used for high-strength fasteners, aerospace fittings, gears and structural components. In short: higher-strength aluminum bronze; hot-forged near net shape; low machinability and formability.
What is the yield strength of C62400?
C62400 has a typical yield strength of 310 MPa (45 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 64% of copper alloy grades. Strength varies by condition: see the 7 listed tempers.
Is C62400 easy to machine?
Not especially — machinability is rated poor (25/100, worse than 86% of copper alloy grades). Tough, gummy chips — use rigid setups, positive-rake carbide, moderate speed (~60–120 m/min) with heavy soluble-oil flood; rating only ~20 % of free-cutting brass.
Can C62400 be welded?
Yes — weldability is rated good (65/100). GTAW/GMAW with matching aluminium-bronze filler (ERCuAl-A2) works well; preheat 150–200 °C on heavy sections, keep interpass low, remove the tenacious alumina film, and re-heat-treat if dealuminification resistance is critical.
What surface finishes work on C62400?
Polishes to a golden lustre and can be chemically patinated or lacquered; not anodizable, and electroplating requires careful oxide removal/strike layers.
Can C62400 be formed, bent or molded?
Hot work at 700–900 °C (forging/extrusion is the normal route); cold formability is poor, so limit cold bending and stress relieve at ~350–400 °C afterwards.
What is the maximum service temperature of C62400?
C62400 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 C62400-M30 and C62400-HR50?
M30 is the default condition — standard stock condition for C62400 rod and bar per ASTM B150; best combination of strength, toughness and availability. HR50: cold-drawn (light draft) then stress relieved: highest yield strength with straight, close-tolerance bar for shafts and pins. Yield strength is 310 MPa in M30 versus 450 MPa in HR50.
How much does C62400 cost?
C62400 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)
- CDA Alloy Datasheet C62400 — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials (copper alloys in seawater) — 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.