Copper Alloy CC755S
EN CC755S
CC755S (CuZn39Pb1AlB-C) is a leaded aluminium brass casting alloy with a boron addition that refines grain structure and improves mechanical consistency from casting to casting.
Reference datasheet — CC755S 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 GM condition
CC755S tempers and conditions
CC755S is supplied in 4 conditions, soft to hard. GM is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Sand cast | Choose for larger, low-volume or one-off housings and valve bodies where thin-wall detail is not critical. | 135 | 355 | 22 | 90 HB | 23 % IACS |
GMDefault Gravity die cast | Default stock condition: best combination of surface finish, dimensional accuracy and strength for series water/valve fittings. | 150 | 370 | 22 | 95 HB | 24 % IACS |
Centrifugally cast | Choose for bushings, sleeves and rings needing dense, inclusion-free rotationally symmetric sections. | 155 | 385 | 22 | 100 HB | 24 % IACS |
Continuously cast | Choose for machined-from-bar parts: uniform fine structure, best soundness and consistent machining behaviour. | 155 | 385 | 20 | 100 HB | 25 % IACS |
What is CC755S?
CC755S (CuZn39Pb1AlB-C) is a leaded aluminium brass casting alloy with a boron addition that refines grain structure and improves mechanical consistency from casting to casting. Default-condition values are 150 MPa yield, 370 MPa tensile, 22 % elongation and 95 HB, and it is poured as sand (GS), permanent-mould (GM), centrifugal (GZ) and continuous (GC) castings, including thin-wall sections. The 1 % lead makes it very free-machining but prevents fusion welding, and lead-leaching rules must be checked for water-contact parts. CC761S is the usual lead-free alternative. CC755S has a density of 8.3 g/cm³ (0.3 lb/in³), lighter than 80% of copper alloy grades. It melts at 880°C (1,616 °F). CC755S has a yield strength of 150 MPa (21.8 ksi) and a tensile strength of 370 MPa (53.7 ksi) — weaker than 69% of copper alloy grades. Elongation at break is 22% and the elastic modulus is 95 GPa (13.8 Msi).
What is CC755S used for?
- precision fittings
- hardware castings
- valve parts
Advantages
- Low embodied carbon — 3.1 kg CO₂/kg, better than 95% of copper alloy grades
- Easy to machine — 78/100, better than 82% of copper alloy grades
Limitations
- Low stiffness — 95 GPa (13.8 Msi), worse than 93% of copper alloy grades
- Needs corrosion protection — 52/100, worse than 93% of copper alloy grades
- Difficult to weld — 25/100, worse than 78% of copper alloy grades
- Limited formability — 18/100, worse than 75% of copper alloy grades
CC755S properties
Typical room-temperature values for CC755S-GM; bars are the position among copper alloy grades.
Physical3
CC755S has a density of 8.3 g/cm³ (0.3 lb/in³), lighter than 80% of copper alloy grades. It melts at 880°C (1,616 °F).
Mechanical15
CC755S has a yield strength of 150 MPa (21.8 ksi) and a tensile strength of 370 MPa (53.7 ksi) — weaker than 69% of copper alloy grades. Elongation at break is 22% and the elastic modulus is 95 GPa (13.8 Msi).
Thermal6
CC755S is rated for continuous service to 200°C (392 °F). It conducts heat at 110 W/m·K (63.6 BTU/hr·ft·°F), better than 58% of copper alloy grades. Thermal expansion is 21 µm/m·K (11.7 µin/in·°F).
Electrical3
CC755S conducts electricity at 24 % IACS, better than 57% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (52/100), worse than 93% of copper alloy grades.
Sustainability4
Producing a kilogram of CC755S takes about 50 MJ of energy and emits 3.1 kg of CO₂ — less than 89% of copper alloy grades. Typical recycled content is 75%.
Manufacturability8
CC755S's machinability is very good (78/100, better than 82% of copper alloy grades); weldability poor (25/100); formability poor (18/100).
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. CC755S is highlighted; hover a dot for its name, or open the interactive family chart.
Working with CC755S
Is CC755S easy to machine?
Very free-machining with the 1 % Pb phase — use sharp positive-rake carbide or HSS, 0° to slight negative rake for brass, high speeds and light lubrication; expect short chips.
Can CC755S be welded?
Fusion welding is not recommended (Pb hot-cracking and Zn fuming); use brazing with silver filler, soldering or mechanical joining, and extract fumes.
Can CC755S be formed, bent or molded?
Casting alloy only — excellent fluidity for thin walls; boron refines grain and reduces gas porosity, degas the melt and use moderate pouring temperature (~1000–1050 °C).
CC755S 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 | 57 – 59 | 58 |
| Pbfree-machining phase | 0.5 – 1.5 | 1 |
| Alimproves fluidity and strength | 0.3 – 1 | 0.6 |
| Bgrain refiner / modifier — distinguishes CC755S from CuZn39Pb1Al-C | 0.01 – 0.06 | 0.02 |
| Fe | ≤ 0.8 | 0.3 |
| Sn | ≤ 0.5 | 0.2 |
| Ni | ≤ 1 | 0.2 |
| Mn | ≤ 0.5 | 0.1 |
| Si | ≤ 0.05 | |
| Zn≈38–40 % | balance |
What surface finishes work on CC755S?
Takes bright polishing, brushing, Ni/Cr or PVD plating and clear lacquer; do not anodize — for potable-water duty check lead-leaching regulations and consider a dezincification-resistant alternative.
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 CC755S in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- CuZn39Pb1AIB-C
How much does CC755S cost?
CC755S is a premium-cost copper alloy ($$$), cheaper than about 51% 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.
CC755S — frequently asked
What is CC755S used for?
CC755S is typically used for precision fittings, hardware castings and valve parts. In short: boron grain-refined cast brass; thin-wall casting grade; very free-machining.
What is the yield strength of CC755S?
CC755S has a typical yield strength of 150 MPa (21.8 ksi) and a tensile strength of 370 MPa (53.7 ksi) — weaker than 69% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is CC755S easy to machine?
Yes — machinability is rated very good (78/100, better than 82% of copper alloy grades). Very free-machining with the 1 % Pb phase — use sharp positive-rake carbide or HSS, 0° to slight negative rake for brass, high speeds and light lubrication; expect short chips.
Can CC755S be welded?
Not readily — weldability is rated poor (25/100). Fusion welding is not recommended (Pb hot-cracking and Zn fuming); use brazing with silver filler, soldering or mechanical joining, and extract fumes.
What surface finishes work on CC755S?
Takes bright polishing, brushing, Ni/Cr or PVD plating and clear lacquer; do not anodize — for potable-water duty check lead-leaching regulations and consider a dezincification-resistant alternative.
Can CC755S be formed, bent or molded?
Casting alloy only — excellent fluidity for thin walls; boron refines grain and reduces gas porosity, degas the melt and use moderate pouring temperature (~1000–1050 °C).
What is the maximum service temperature of CC755S?
CC755S 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 CC755S-GM and CC755S-GS?
GM is the default condition — default stock condition: best combination of surface finish, dimensional accuracy and strength for series water/valve fittings. GS: choose for larger, low-volume or one-off housings and valve bodies where thin-wall detail is not critical. Yield strength is 150 MPa in GM versus 135 MPa in GS.
How much does CC755S cost?
CC755S is a premium-cost copper alloy ($$$), cheaper than about 51% 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)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- CDA copper alloy datasheets (cast leaded brasses) — Copper Development Association (2023)
- European brass foundry alloy datasheets (CuZn39Pb1Al-C family) — various foundries (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.