Copper Alloy CC482K-GM (Permanent (chill) mould cast)
Finish state
EN CC482K
Pick chill (permanent mould) casting for small and medium runs with fairly uniform wall thickness; faster cooling refines the structure to 300 MPa tensile and 95 HB.
Values for the GM condition
Other CC482K tempers and conditions
CC482K is listed in 4 conditions; see the grade overview at CC482K.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Sand cast | Choose sand casting for large, one-off or geometrically complex parts; strength and hardness are the lowest of the four routes at 270 MPa tensile and 85 HB. | 150 | 270 | 8 | 85 HB | 10.5 % IACS |
GCDefault Continuous cast bar/tube | Choose continuously cast bar or tube — the most commonly stocked form — when turning bushings, lead-screw nuts and guides directly; 300 MPa tensile, 95 HB, best machinability. | 170 | 300 | 8 | 95 HB | 11 % IACS |
GMThis page Permanent (chill) mould cast | Pick chill (permanent mould) casting for small and medium runs with fairly uniform wall thickness; faster cooling refines the structure to 300 MPa tensile and 95 HB. | 170 | 300 | 7 | 95 HB | 11 % IACS |
Centrifugal cast | Use centrifugal casting for large-diameter bushings and worm-wheel rims: densest structure and highest properties (320 MPa tensile, 100 HB), at the cost of larger machining allowance. | 185 | 320 | 7 | 100 HB | 11.5 % IACS |
What is CC482K-GM?
CC482K-GM is CC482K supplied in the GM condition — pick chill (permanent mould) casting for small and medium runs with fairly uniform wall thickness; faster cooling refines the structure to 300 MPa tensile and 95 HB. CC482K-GM has a yield strength of 170 MPa (24.7 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 62% of copper alloy grades. Elongation at break is 7% and the elastic modulus is 103 GPa (14.9 Msi). CC482K-GM has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 58% of copper alloy grades. It melts at 830°C (1,526 °F). GC is the default condition FabDigit quotes; GM is available on request or by drawing note.
Limitations
- Limited formability — 8/100, worse than 94% of copper alloy grades
- Limited ductility — 7%, worse than 86% of copper alloy grades
- High embodied carbon — 4.6 kg CO₂/kg, worse than 82% of copper alloy grades
- Difficult to weld — 25/100, worse than 78% of copper alloy grades
CC482K-GM properties
Typical room-temperature values for CC482K-GM; 21 are specific to this condition. Other listed values are CC482K reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
CC482K-GM has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 58% of copper alloy grades. It melts at 830°C (1,526 °F).
Mechanical15
CC482K-GM has a yield strength of 170 MPa (24.7 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 62% of copper alloy grades. Elongation at break is 7% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
CC482K-GM is rated for continuous service to 250°C (482 °F). It conducts heat at 47 W/m·K (27.2 BTU/hr·ft·°F), worse than 69% of copper alloy grades. Thermal expansion is 18.5 µm/m·K (10.3 µin/in·°F).
Electrical3
CC482K-GM conducts electricity at 11 % IACS, worse than 68% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (70/100), better than 76% of copper alloy grades.
Sustainability4
Producing a kilogram of CC482K-GM takes about 65 MJ of energy and emits 4.6 kg of CO₂ — more than 81% of copper alloy grades. Typical recycled content is 70%.
Manufacturability7
CC482K-GM's machinability is good (56/100, better than 73% of copper alloy grades); weldability poor (25/100); formability not recommended (8/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CC482K-GM
Is CC482K easy to machine?
Machines well with sharp positive-rake carbide or HSS tooling at high speed and light feed; the 2 % lead breaks chips and allows mirror-finish bores. Avoid excessive relief angles, which let the tool push off the work.
Can CC482K be welded?
Fusion weldability is poor because lead promotes hot cracking and tin segregates. Repair with low heat input GTAW using tin-bronze filler, or braze; welded joints are not recommended for structural parts.
Can CC482K be formed, bent or molded?
The mushy freezing range is wide, so use strong feeding, chills and directional solidification to prevent microshrinkage. Shape by casting plus machining only, with no cold bending or cold heading.
What surface finishes work on CC482K?
Polishes to a golden bronze lustre and accepts tin, nickel or chrome plating and chemical passivation. Bushings are normally only finish-turned or honed so oil grooves are retained; anodising does not apply.
CC482K 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 |
|---|---|---|
| Sn | 10 – 11.5 | 10.8 |
| Pbrefines chips, improves running-in | 1 – 3 | 2 |
| Znimpurity limit | ≤ 0.5 | — |
| Nicounted in the copper content | ≤ 2 | — |
| Pdeoxidizer, hard Cu3P phase | ≤ 0.4 | 0.15 |
| Fe | ≤ 0.2 | — |
| Sb | ≤ 0.25 | — |
| Mn | ≤ 0.2 | — |
| S | ≤ 0.1 | — |
| Alstrictly limited, affects casting soundness | ≤ 0.01 | — |
| Si | ≤ 0.01 | — |
| Cubalance, about 85–88% | balance | — |
CC482K-GM — frequently asked
What is CC482K-GM used for?
CC482K-GM is typically used for pump bodies, valve components, worm wheels, high-pressure fittings and marine hardware. In short: free-machining high-tin bronze; stronger than gunmetal; pressure-tight bronze castings.
What is the yield strength of CC482K-GM?
CC482K-GM has a typical yield strength of 170 MPa (24.7 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 62% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is CC482K-GM easy to machine?
Reasonably — machinability is rated good (56/100, better than 73% of copper alloy grades). Machines well with sharp positive-rake carbide or HSS tooling at high speed and light feed; the 2 % lead breaks chips and allows mirror-finish bores. Avoid excessive relief angles, which let the tool push off the work.
Can CC482K-GM be welded?
Not readily — weldability is rated poor (25/100). Fusion weldability is poor because lead promotes hot cracking and tin segregates. Repair with low heat input GTAW using tin-bronze filler, or braze; welded joints are not recommended for structural parts.
What surface finishes work on CC482K-GM?
Polishes to a golden bronze lustre and accepts tin, nickel or chrome plating and chemical passivation. Bushings are normally only finish-turned or honed so oil grooves are retained; anodising does not apply.
Can CC482K-GM be formed, bent or molded?
The mushy freezing range is wide, so use strong feeding, chills and directional solidification to prevent microshrinkage. Shape by casting plus machining only, with no cold bending or cold heading.
What is the maximum service temperature of CC482K-GM?
CC482K-GM is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CC482K-GC and CC482K-GS?
GC is the default condition — choose continuously cast bar or tube — the most commonly stocked form — when turning bushings, lead-screw nuts and guides directly; 300 MPa tensile, 95 HB, best machinability. GS: choose sand casting for large, one-off or geometrically complex parts; strength and hardness are the lowest of the four routes at 270 MPa tensile and 85 HB. Yield strength is 170 MPa in GC versus 150 MPa in GS.
Sources
- EN 1982 Copper and copper alloys — Ingots and castings (CuSn11Pb2-C, CC482K) — CEN (2017)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- CDA Alloy Datasheets C90700 / C92700 (near-equivalent tin bronzes) — Copper Development Association (2023)
- GB/T 1176 (ZCuSn10Pb2 ) — SAC (2013)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.