Copper Alloy C61800
UNS C61800 · ASTM B150 · EN CW305G · GB QAl9-4
C61800 is a wrought aluminum bronze with about 9% aluminum plus an iron addition (CW305G, ASTM B150), strengthened by its alpha/kappa structure rather than by heat treatment.
Reference datasheet — C61800 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
C61800 tempers and conditions
C61800 is supplied in 5 conditions, soft to hard. M30 is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Choose for maximum ductility before severe forming, bending or deep drawing of rod/plate. | 210 | 520 | 40 | 140 HB | 14 % IACS |
M30Default As hot extruded | The standard stocked condition for round bar, hex and shapes — balanced strength, ductility and cost. | 275 | 585 | 30 | 170 HB | — |
Hot rolled / hot worked plate and flats | Plate, flat bar and forged shapes supplied in the as-hot-worked condition for marine structural parts. | 300 | 600 | 26 | 175 HB | 13 % IACS |
Full hard | Pick for higher yield strength, better surface finish and tighter tolerance on small-diameter rod, shafts and fasteners. | 415 | 655 | 18 | 13 HRC | 12.5 % IACS |
Quench hardened and tempered | Use at the high-aluminium end of the range when maximum strength and wear resistance are needed for bushings, gears and valve stems. | 450 | 725 | 12 | 22 HRC | 12 % IACS |
What is C61800?
C61800 is a wrought aluminum bronze with about 9% aluminum plus an iron addition (CW305G, ASTM B150), strengthened by its alpha/kappa structure rather than by heat treatment. Typical values are 275 MPa yield, 585 MPa tensile, 30% elongation and 170 HB (92 HRB), with a corrosion resistance rating of 78 and service to 300 °C; usual forms are rod, bar, extrusions and forgings. The tenacious alumina film gives good seawater resistance but makes machining gummy and weld preparation critical, and cold forming is limited. C62300 is the nearest choice when higher hardness and wear resistance are needed. C61800 has a density of 7.58 g/cm³ (0.274 lb/in³), lighter than 94% of copper alloy grades. It melts at 1,043°C (1,909 °F). C61800 has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 585 MPa (84.8 ksi) — stronger than 57% of copper alloy grades. Elongation at break is 30% and the elastic modulus is 117 GPa (17 Msi).
What is C61800 used for?
- marine fasteners
- pump shafts
- corrosion-resistant fittings
- bushings
Advantages
- Lightweight — 7.58 g/cm³ (0.274 lb/in³), better than 94% of copper alloy grades
- Good corrosion resistance — 78/100, better than 94% of copper alloy grades
- Tough — resists crack growth — 55 MPa·√m (50.1 ksi·√in), better than 85% 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
C61800 properties
Typical room-temperature values for C61800-M30; bars are the position among copper alloy grades.
Physical3
C61800 has a density of 7.58 g/cm³ (0.274 lb/in³), lighter than 94% of copper alloy grades. It melts at 1,043°C (1,909 °F).
Mechanical16
C61800 has a yield strength of 275 MPa (39.9 ksi) and a tensile strength of 585 MPa (84.8 ksi) — stronger than 57% of copper alloy grades. Elongation at break is 30% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C61800 is rated for continuous service to 300°C (572 °F). It conducts heat at 56 W/m·K (32.4 BTU/hr·ft·°F), worse than 64% of copper alloy grades. Thermal expansion is 16.2 µm/m·K (9 µin/in·°F).
Electrical3
C61800 conducts electricity at 13 % IACS, worse than 58% 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 C61800 takes about 55 MJ of energy and emits 3.7 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 40%.
Manufacturability8
C61800's machinability is poor (30/100, worse than 67% 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. C61800 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C61800
Is C61800 easy to machine?
Tough, gummy chips — use rigid setups, sharp positive-rake carbide, moderate speed (60–90 m/min) with heavy flood coolant; rating ≈40 % of AISI 1212.
Can C61800 be welded?
Readily GTAW/GMAW welded with matching ERCuAl-A2 filler; remove the alumina film mechanically or with AC/He cleaning and keep interpass temperature low.
Can C61800 be formed, bent or molded?
Hot work at 700–850 °C; cold bending is limited (fair formability), so anneal at 620–670 °C with fast cooling between severe cold-forming steps.
C61800 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 | 8.5 – 11 | 9.5 |
| Fe | 0.5 – 1.5 | 1 |
| Si | ≤ 0.1 | |
| Zn | ≤ 0.02 | |
| Pb | ≤ 0.02 | |
| CuCu + named elements 99.5 % min | balance |
What surface finishes work on C61800?
Not anodisable — finish by machining/polishing to a golden lustre, or apply clear lacquer; electroplating requires thorough oxide removal and a nickel strike.
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 C61800 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B150
- EN / DIN / Werkstoff-Nr.
- CW305G
- GB (China)
- QAl9-4
- Other
- ERCuAl-A2
How much does C61800 cost?
C61800 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.
C61800 — frequently asked
What is C61800 used for?
C61800 is typically used for marine fasteners, pump shafts, corrosion-resistant fittings and bushings. In short: general-purpose aluminum bronze; strong seawater resistance; weldable but gummy to machine.
What is the yield strength of C61800?
C61800 has a typical yield strength of 275 MPa (39.9 ksi) and a tensile strength of 585 MPa (84.8 ksi) — stronger than 57% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is C61800 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 67% of copper alloy grades). Tough, gummy chips — use rigid setups, sharp positive-rake carbide, moderate speed (60–90 m/min) with heavy flood coolant; rating ≈40 % of AISI 1212.
Can C61800 be welded?
Yes — weldability is rated very good (70/100). Readily GTAW/GMAW welded with matching ERCuAl-A2 filler; remove the alumina film mechanically or with AC/He cleaning and keep interpass temperature low.
What surface finishes work on C61800?
Not anodisable — finish by machining/polishing to a golden lustre, or apply clear lacquer; electroplating requires thorough oxide removal and a nickel strike.
Can C61800 be formed, bent or molded?
Hot work at 700–850 °C; cold bending is limited (fair formability), so anneal at 620–670 °C with fast cooling between severe cold-forming steps.
What is the maximum service temperature of C61800?
C61800 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 C61800-M30 and C61800-TQ50?
M30 is the default condition — the standard stocked condition for round bar, hex and shapes — balanced strength, ductility and cost. TQ50: use at the high-aluminium end of the range when maximum strength and wear resistance are needed for bushings, gears and valve stems. Yield strength is 275 MPa in M30 versus 450 MPa in TQ50.
How much does C61800 cost?
C61800 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)
- EN 12163 / CW305G copper alloy rod — CEN (2016)
- GB/T 4423 / GB/T 1176 (QAl9-4) — SAC (2020)
- CDA Alloy Datasheet C61800 — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties of 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.