Copper Alloy CC483K-GM (Permanent mould (chill) cast)
Finish state
EN CC483K
Series production of small/medium bushings and gear blanks needing finer structure than sand casting.
Values for the GM condition
Other CC483K tempers and conditions
CC483K is listed in 5 conditions; see the grade overview at CC483K.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Sand cast | Large or one-off bushings, worm wheels and housings where section size rules out chill or continuous casting. | 160 | 280 | 7 | 90 HB | 9 % IACS |
Investment / precision cast | Near-net-shape small parts with complex geometry where machining from bar would be wasteful. | 160 | 280 | 5 | 92 HB | 9 % IACS |
GMThis page Permanent mould (chill) cast | Series production of small/medium bushings and gear blanks needing finer structure than sand casting. | 175 | 300 | 6 | 95 HB | 9 % IACS |
Centrifugally cast | Best choice for large-diameter bushings, worm-wheel rims and sleeves needing dense, porosity-free walls. | 180 | 310 | 8 | 98 HB | 9 % IACS |
GCDefault Continuously cast | Standard stocked form (solid and hollow bar) for machined bearings, nuts and slide plates; finest, most uniform structure. | 190 | 320 | 6 | 100 HB | 9 % IACS |
What is CC483K-GM?
CC483K-GM is CC483K supplied in the GM condition — series production of small/medium bushings and gear blanks needing finer structure than sand casting. CC483K-GM has a yield strength of 175 MPa (25.4 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 60% of copper alloy grades. Elongation at break is 6% and the elastic modulus is 98 GPa (14.2 Msi). CC483K-GM has a density of 8.75 g/cm³ (0.316 lb/in³), lighter than 51% 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 ductility — 6%, worse than 89% of copper alloy grades
- Limited formability — 10/100, worse than 89% of copper alloy grades
- Low stiffness — 98 GPa (14.2 Msi), worse than 86% of copper alloy grades
- High embodied carbon — 4.5 kg CO₂/kg, worse than 79% of copper alloy grades
- Low electrical conductivity — 9 % IACS, worse than 78% of copper alloy grades
CC483K-GM properties
Typical room-temperature values for CC483K-GM; 21 are specific to this condition. Other listed values are CC483K reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
CC483K-GM has a density of 8.75 g/cm³ (0.316 lb/in³), lighter than 51% of copper alloy grades. It melts at 830°C (1,526 °F).
Mechanical15
CC483K-GM has a yield strength of 175 MPa (25.4 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 60% of copper alloy grades. Elongation at break is 6% and the elastic modulus is 98 GPa (14.2 Msi).
Thermal6
CC483K-GM is rated for continuous service to 250°C (482 °F). It conducts heat at 48 W/m·K (27.7 BTU/hr·ft·°F), worse than 67% of copper alloy grades. Thermal expansion is 18.5 µm/m·K (10.3 µin/in·°F).
Electrical3
CC483K-GM conducts electricity at 9 % IACS, worse than 78% 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 CC483K-GM takes about 62 MJ of energy and emits 4.5 kg of CO₂ — more than 76% of copper alloy grades. Typical recycled content is 50%.
Manufacturability7
CC483K-GM's machinability is fair (42/100, better than 59% of copper alloy grades); weldability poor (25/100); formability not recommended (10/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CC483K-GM
Is CC483K easy to machine?
Machines to a good finish with sharp, positive-rake carbide and light feeds, but the hard δ-phase makes chips short and abrasive — expect roughly a fifth the throughput of free-cutting brass and use flood coolant.
Can CC483K be welded?
Fusion welding is unreliable (hot-short, tin oxidation and porosity); repair by TIG with matching bronze filler and preheat 150–200 °C, or preferably braze/silver-solder.
Can CC483K be formed, bent or molded?
Not cold formable — supply only as-cast; casting needs strong risering because of the wide freezing range and a slow, low-turbulence pour to avoid tin sweat and inverse segregation.
What surface finishes work on CC483K?
Takes a bright polish and readily accepts tin, nickel or chrome plating; bearing bores are normally finish-bored or honed rather than reamed, and no anodizing is applicable.
CC483K 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 |
|---|---|---|
| Snprincipal alloying element, forms hard δ-phase | 11 – 13 | 12 |
| Pdeoxidant; raises hardness/wear resistance | 0.01 – 0.4 | 0.25 |
| Pbimpurity limit — lead-free grade | ≤ 0.25 | — |
| Ni | ≤ 2 | — |
| Zn | ≤ 0.5 | — |
| Fe | ≤ 0.2 | — |
| Sb | ≤ 0.3 | — |
| S | ≤ 0.1 | — |
| Altightly limited — causes casting defects | ≤ 0.01 | — |
| Si | ≤ 0.01 | — |
| Mn | ≤ 0.2 | — |
| Curemainder, approx. 86–88 % | balance | — |
CC483K-GM — frequently asked
What is CC483K-GM used for?
CC483K-GM is typically used for worm gears, bushings, bearing bushes, high-load slides and gear wheels. In short: lead-free 12 % tin bronze; hardest standard tin bronze; gear and bearing grade.
What is the yield strength of CC483K-GM?
CC483K-GM has a typical yield strength of 175 MPa (25.4 ksi) and a tensile strength of 300 MPa (43.5 ksi) — weaker than 60% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is CC483K-GM easy to machine?
Not especially — machinability is rated fair (42/100, better than 59% of copper alloy grades). Machines to a good finish with sharp, positive-rake carbide and light feeds, but the hard δ-phase makes chips short and abrasive — expect roughly a fifth the throughput of free-cutting brass and use flood coolant.
Can CC483K-GM be welded?
Not readily — weldability is rated poor (25/100). Fusion welding is unreliable (hot-short, tin oxidation and porosity); repair by TIG with matching bronze filler and preheat 150–200 °C, or preferably braze/silver-solder.
What surface finishes work on CC483K-GM?
Takes a bright polish and readily accepts tin, nickel or chrome plating; bearing bores are normally finish-bored or honed rather than reamed, and no anodizing is applicable.
Can CC483K-GM be formed, bent or molded?
Not cold formable — supply only as-cast; casting needs strong risering because of the wide freezing range and a slow, low-turbulence pour to avoid tin sweat and inverse segregation.
What is the maximum service temperature of CC483K-GM?
CC483K-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 CC483K-GC and CC483K-GS?
GC is the default condition — standard stocked form (solid and hollow bar) for machined bearings, nuts and slide plates; finest, most uniform structure. GS: large or one-off bushings, worm wheels and housings where section size rules out chill or continuous casting. Yield strength is 190 MPa in GC versus 160 MPa in GS.
Sources
- EN 1982 — Copper and copper alloys: ingots and castings — CEN (2017)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Copper alloy datasheets (CuSn12-C / C90700-C90800 class) — Copper Development Association / DKI (2020)
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.