Copper Alloy C62581
UNS C62581 · ASTM B150
C62581 is the higher-strength member of the ASTM B150 aluminum bronze forging alloys, used for aerospace and heavy-duty mechanical fasteners.
Reference datasheet — C62581 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 TQ50 condition
C62581 tempers and conditions
C62581 is supplied in 3 conditions, soft to hard. TQ50 is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As hot extruded | Lowest-cost mill condition for extruded rod and bar where slightly lower strength and a little more ductility are acceptable. | 414 | 758 | 5 | 21 HRC | 7.5 % IACS |
As hot forged and air cooled | Forgings and heavy sections used directly from the press without a separate quench-and-temper cycle. | 448 | 772 | 4 | 23 HRC | 7.5 % IACS |
TQ50Default Quench hardened and temper annealed | Standard supply condition for bar, shapes and forgings when maximum strength and wear/galling resistance are required. | 483 | 793 | 3 | 26 HRC | — |
What is C62581?
C62581 is the higher-strength member of the ASTM B150 aluminum bronze forging alloys, used for aerospace and heavy-duty mechanical fasteners. It reaches 793 MPa tensile strength, 483 MPa yield and 262 HB (26 HRC) with 3 % elongation, and is rated for service to about 300 °C. That strength comes with hard κ phase that makes machining abrasive (roughly 20 % of AISI 1212), crack-sensitive fusion welding and no practical cold forming. Choose C62580 where slightly more ductility and easier processing are acceptable. C62581 has a density of 7.3 g/cm³ (0.264 lb/in³), lighter than 100% of copper alloy grades. It melts at 1,015°C (1,859 °F). C62581 has a yield strength of 483 MPa (70.1 ksi) and a tensile strength of 793 MPa (115 ksi) — stronger than 88% of copper alloy grades. Elongation at break is 3% and the elastic modulus is 115 GPa (16.7 Msi).
What is C62581 used for?
- aerospace fasteners
- high-load bolts
- forged mechanical parts
Advantages
- Lightweight — 7.3 g/cm³ (0.264 lb/in³), better than 100% of copper alloy grades
- High strength — 483 MPa (70.1 ksi), better than 88% of copper alloy grades
- High service temperature — 300°C (572 °F), better than 85% of copper alloy grades
- Good corrosion resistance — 72/100, better than 84% of copper alloy grades
Limitations
- Limited ductility — 3%, worse than 97% of copper alloy grades
- Limited formability — 10/100, worse than 89% of copper alloy grades
- Low electrical conductivity — 7.5 % IACS, worse than 84% of copper alloy grades
- Poor heat conductor — 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 80% of copper alloy grades
- Difficult to weld — 25/100, worse than 78% of copper alloy grades
C62581 properties
Typical room-temperature values for C62581-TQ50; bars are the position among copper alloy grades.
Physical3
C62581 has a density of 7.3 g/cm³ (0.264 lb/in³), lighter than 100% of copper alloy grades. It melts at 1,015°C (1,859 °F).
Mechanical14
C62581 has a yield strength of 483 MPa (70.1 ksi) and a tensile strength of 793 MPa (115 ksi) — stronger than 88% of copper alloy grades. Elongation at break is 3% and the elastic modulus is 115 GPa (16.7 Msi).
Thermal5
C62581 is rated for continuous service to 300°C (572 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 80% of copper alloy grades. Thermal expansion is 16.2 µm/m·K (9 µin/in·°F).
Electrical3
C62581 conducts electricity at 7.5 % IACS, worse than 84% 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 C62581 takes about 60 MJ of energy and emits 4 kg of CO₂ — more than 69% of copper alloy grades. Typical recycled content is 35%.
Manufacturability8
C62581's machinability is poor (30/100, worse than 67% of copper alloy grades); weldability poor (25/100); formability not recommended (10/100).
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. C62581 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C62581
Is C62581 easy to machine?
Machine with sharp, rigid, positive-rake carbide at modest speed and heavy feed with flood coolant; the hard κ phase makes chips abrasive and tool wear high (~20 % of AISI 1212).
Can C62581 be welded?
Fusion welding is difficult and crack-sensitive — use GTAW/GMAW with matching Cu-Al filler, 200–300 °C preheat, low heat input, and expect a locally embrittled HAZ; mechanical joining or brazing-free press fits are preferred.
Can C62581 be formed, bent or molded?
Hot work only (700–850 °C forging/extrusion); cold bending or forming is not practical because room-temperature ductility is 1–6 %.
C62581 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 |
|---|---|---|
| Alhigh-Al variant of the C625xx forging bronzes | 12.5 – 13.5 | 13 |
| Fegrain refiner / κ-phase former | 3 – 5 | 4 |
| Nioptional/residual per registered limits | ≤ 2 | |
| Mn | ≤ 2 | |
| Si | ≤ 0.1 | |
| Zn | ≤ 0.5 | |
| Sn | ≤ 0.2 | |
| Pb | ≤ 0.02 | |
| Curemainder, ≈78–82 % (Cu + named elements 99.5 % min) | balance |
What surface finishes work on C62581?
Not anodisable; finish by grinding/lapping for bearing surfaces, and use passivation, chemical patina or electroless nickel/chrome plating where a decorative or extra-wear surface is needed.
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 C62581 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B150
How much does C62581 cost?
C62581 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.
C62581 — frequently asked
What is C62581 used for?
C62581 is typically used for aerospace fasteners, high-load bolts and forged mechanical parts. In short: strongest B150 aluminum bronze; forged fastener grade; hard, abrasive, low-ductility.
What is the yield strength of C62581?
C62581 has a typical yield strength of 483 MPa (70.1 ksi) and a tensile strength of 793 MPa (115 ksi) — stronger than 88% of copper alloy grades. Strength varies by condition: see the 3 listed tempers.
Is C62581 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 67% of copper alloy grades). Machine with sharp, rigid, positive-rake carbide at modest speed and heavy feed with flood coolant; the hard κ phase makes chips abrasive and tool wear high (~20 % of AISI 1212).
Can C62581 be welded?
Not readily — weldability is rated poor (25/100). Fusion welding is difficult and crack-sensitive — use GTAW/GMAW with matching Cu-Al filler, 200–300 °C preheat, low heat input, and expect a locally embrittled HAZ; mechanical joining or brazing-free press fits are preferred.
What surface finishes work on C62581?
Not anodisable; finish by grinding/lapping for bearing surfaces, and use passivation, chemical patina or electroless nickel/chrome plating where a decorative or extra-wear surface is needed.
Can C62581 be formed, bent or molded?
Hot work only (700–850 °C forging/extrusion); cold bending or forming is not practical because room-temperature ductility is 1–6 %.
What is the maximum service temperature of C62581?
C62581 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 C62581-TQ50 and C62581-M30?
TQ50 is the default condition — standard supply condition for bar, shapes and forgings when maximum strength and wear/galling resistance are required. M30: lowest-cost mill condition for extruded rod and bar where slightly lower strength and a little more ductility are acceptable. Yield strength is 483 MPa in TQ50 versus 414 MPa in M30.
How much does C62581 cost?
C62581 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 Standard Designations for Wrought Copper Alloys (C625xx aluminium bronzes) — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials (copper alloys in seawater) — ASM International (2005)
- High-strength aluminium bronze wear alloys (Cu-13Al-4Fe class) datasheets — Ampco Metal / aluminium-bronze producers (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.