Copper Alloy CC764S
EN CC764S
CC764S (CuZn34Mn3Al2Fe1-C, equivalent to C86300) is a high-manganese aluminium brass casting alloy, the strongest member of the manganese-brass group, strengthened by Mn, Al and Fe in an alpha-beta matrix.
Reference datasheet — CC764S 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 GS condition
CC764S tempers and conditions
CC764S is supplied in 5 conditions, soft to hard. GS 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 |
|---|---|---|---|---|---|---|
Stress relieved | Order when residual stresses must be reduced before precision machining or to lower stress-corrosion risk in ammoniacal service. | 370 | 660 | 20 | 165 HB | 8.5 % IACS |
GSDefault Sand cast | Default condition for large or one-off marine and machinery castings; lowest strength of the four routes but best for complex shapes. | 390 | 680 | 18 | 170 HB | — |
Permanent (metal) mould / chill cast | Pick for series parts where the finer chill-cast structure raises strength and hardness over sand casting. | 450 | 740 | 15 | 185 HB | 8 % IACS |
Continuously cast bar / tube | Stock form for machined bushings, nuts and wear plates cut from continuous-cast bar or hollow. | 460 | 750 | 13 | 185 HB | 8 % IACS |
Centrifugally cast | Best choice for bushings, sleeves and gear rims — dense, porosity-free rings with the highest strength. | 470 | 780 | 14 | 190 HB | 8 % IACS |
What is CC764S?
CC764S (CuZn34Mn3Al2Fe1-C, equivalent to C86300) is a high-manganese aluminium brass casting alloy, the strongest member of the manganese-brass group, strengthened by Mn, Al and Fe in an alpha-beta matrix. It is chosen for heavily loaded marine and industrial castings, with 390 MPa yield, 680 MPa tensile, 18 % elongation and 170 HB in sand, chill, centrifugal, continuous and stress-relieved conditions (GS, GM, GZ, GC, SR). Constraints are a machinability rating of only 30, service limited to about 200 °C, and fusion welding that is normally avoided. CC763S is the lower-strength, easier-cutting alternative. CC764S has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 90% of copper alloy grades. It melts at 875°C (1,607 °F). CC764S has a yield strength of 390 MPa (56.6 ksi) and a tensile strength of 680 MPa (98.6 ksi) — stronger than 78% of copper alloy grades. Elongation at break is 18% and the elastic modulus is 100 GPa (14.5 Msi).
What is CC764S used for?
- propeller hubs
- structural marine parts
- high-load bushings
Advantages
- High strength — 390 MPa (56.6 ksi), better than 78% of copper alloy grades
Limitations
- Hard to polish — 60/100, worse than 92% of copper alloy grades
- Poor heat conductor — 32 W/m·K (18.5 BTU/hr·ft·°F), worse than 90% of copper alloy grades
- Low stiffness — 100 GPa (14.5 Msi), worse than 82% of copper alloy grades
- Low electrical conductivity — 8 % IACS, worse than 81% of copper alloy grades
- Limited formability — 15/100, worse than 79% of copper alloy grades
CC764S properties
Typical room-temperature values for CC764S-GS; bars are the position among copper alloy grades.
Physical3
CC764S has a density of 7.7 g/cm³ (0.278 lb/in³), lighter than 90% of copper alloy grades. It melts at 875°C (1,607 °F).
Mechanical14
CC764S has a yield strength of 390 MPa (56.6 ksi) and a tensile strength of 680 MPa (98.6 ksi) — stronger than 78% of copper alloy grades. Elongation at break is 18% and the elastic modulus is 100 GPa (14.5 Msi).
Thermal6
CC764S is rated for continuous service to 200°C (392 °F). It conducts heat at 32 W/m·K (18.5 BTU/hr·ft·°F), worse than 90% of copper alloy grades. Thermal expansion is 20 µm/m·K (11.1 µin/in·°F).
Electrical3
CC764S conducts electricity at 8 % IACS, worse than 81% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 86% of copper alloy grades.
Sustainability4
Producing a kilogram of CC764S takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 50%.
Manufacturability7
CC764S's machinability is poor (30/100, worse than 67% of copper alloy grades); weldability poor (25/100); formability poor (15/100).
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. CC764S is highlighted; hover a dot for its name, or open the interactive family chart.
Working with CC764S
Is CC764S easy to machine?
Machines like a tough alpha-beta brass — rigid setups, sharp carbide tooling, moderate speeds and generous coolant; chips are stringy, so it cuts far slower than free-cutting C36000.
Can CC764S be welded?
Fusion welding is generally avoided (Zn fume, hot cracking); minor defects are repaired by GTAW/GMAW with matching Al-brass or Ni-Al-bronze filler, preheating and post-weld stress relief.
Can CC764S be formed, bent or molded?
Casting alloy only — pour at about 1000–1050 °C with chills/risers on heavy sections to avoid shrinkage porosity; no cold forming.
CC764S 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 |
|---|---|---|
| Cu | 60 – 66 | 63 |
| Mn | 2 – 4 | 3 |
| Al | 1 – 2.5 | 2 |
| Fe | 0.5 – 1.5 | 1 |
| Niimpurity limit | ≤ 1 | |
| Snimpurity limit | ≤ 0.4 | |
| Pbimpurity limit | ≤ 0.5 | |
| Siimpurity limit | ≤ 0.1 | |
| Zn | balance |
What surface finishes work on CC764S?
Takes a bright mechanical polish and can be nickel- or chrome-plated after thorough Al-oxide removal; leave a machining allowance on cast surfaces and avoid strong ammonia-based cleaners.
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 CC764S in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- CuZn34Mn3AI2Fe1-C
- Similar grades
- C86300
How much does CC764S cost?
CC764S 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.
CC764S — frequently asked
What is CC764S used for?
CC764S is typically used for propeller hubs, structural marine parts and high-load bushings. In short: strongest cast manganese brass; high-load marine castings; low machinability rating.
What is the yield strength of CC764S?
CC764S has a typical yield strength of 390 MPa (56.6 ksi) and a tensile strength of 680 MPa (98.6 ksi) — stronger than 78% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is CC764S easy to machine?
Not especially — machinability is rated poor (30/100, worse than 67% of copper alloy grades). Machines like a tough alpha-beta brass — rigid setups, sharp carbide tooling, moderate speeds and generous coolant; chips are stringy, so it cuts far slower than free-cutting C36000.
Can CC764S be welded?
Not readily — weldability is rated poor (25/100). Fusion welding is generally avoided (Zn fume, hot cracking); minor defects are repaired by GTAW/GMAW with matching Al-brass or Ni-Al-bronze filler, preheating and post-weld stress relief.
What surface finishes work on CC764S?
Takes a bright mechanical polish and can be nickel- or chrome-plated after thorough Al-oxide removal; leave a machining allowance on cast surfaces and avoid strong ammonia-based cleaners.
Can CC764S be formed, bent or molded?
Casting alloy only — pour at about 1000–1050 °C with chills/risers on heavy sections to avoid shrinkage porosity; no cold forming.
What is the maximum service temperature of CC764S?
CC764S is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CC764S-GS and CC764S-GZ?
GS is the default condition — default condition for large or one-off marine and machinery castings; lowest strength of the four routes but best for complex shapes. GZ: best choice for bushings, sleeves and gear rims — dense, porosity-free rings with the highest strength. Yield strength is 390 MPa in GS versus 470 MPa in GZ.
How much does CC764S cost?
CC764S 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
- EN 1982 — Copper and copper alloys: ingots and castings — CEN (2017)
- C86300 High-Strength Manganese Bronze alloy datasheet — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol. 2 — Properties of Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- ASTM B584 — Copper Alloy Sand Castings for General Applications — ASTM (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.