Copper Alloy CC484K-GM
Finish state
EN CC484K
GM = chill / permanent-mould (gravity die) cast
Choose for medium-series small gear blanks and bushes needing finer structure and tighter dimensions than sand casting.
Values for the GM condition
Other CC484K tempers and conditions
CC484K is listed in 4 conditions; see the grade overview at CC484K.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Sand cast | Choose for large, one-off or complex-shaped worm wheels and bearing housings where tooling cost dominates. | 175 | 300 | 10 | 95 HB | 10 % IACS |
GMThis page Chill / permanent-mould (gravity die) cast | Choose for medium-series small gear blanks and bushes needing finer structure and tighter dimensions than sand casting. | 195 | 320 | 9 | 100 HB | 10 % IACS |
GZDefault Centrifugally cast | Default for worm-wheel rims, wear rings and heavy bushes — dense, porosity-free wall with radially refined structure. | 200 | 330 | 10 | 105 HB | 10 % IACS |
Continuously cast bar / tube | Choose for stock bar and tube machined into bushes, nuts and small gears — most uniform structure and best machined surface. | 205 | 340 | 10 | 110 HB | 10 % IACS |
What is CC484K-GM?
CC484K-GM is CC484K supplied in the GM condition — choose for medium-series small gear blanks and bushes needing finer structure and tighter dimensions than sand casting. CC484K-GM has a yield strength of 195 MPa (28.3 ksi) and a tensile strength of 320 MPa (46.4 ksi) — weaker than 56% of copper alloy grades. Elongation at break is 9% and the elastic modulus is 105 GPa (15.2 Msi). CC484K-GM has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 58% of copper alloy grades. It melts at 835°C (1,535 °F). GZ is the default condition FabDigit quotes; GM is available on request or by drawing note.
Advantages
- High service temperature — 260°C (500 °F), better than 75% of copper alloy grades
Limitations
- Limited formability — 5/100, worse than 98% of copper alloy grades
- Difficult to weld — 20/100, worse than 88% of copper alloy grades
- Limited ductility — 9%, worse than 79% of copper alloy grades
CC484K-GM properties
Typical room-temperature values for CC484K-GM; 21 are specific to this condition. Other listed values are CC484K reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
CC484K-GM has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 58% of copper alloy grades. It melts at 835°C (1,535 °F).
Mechanical15
CC484K-GM has a yield strength of 195 MPa (28.3 ksi) and a tensile strength of 320 MPa (46.4 ksi) — weaker than 56% of copper alloy grades. Elongation at break is 9% and the elastic modulus is 105 GPa (15.2 Msi).
Thermal6
CC484K-GM is rated for continuous service to 260°C (500 °F). It conducts heat at 46 W/m·K (26.6 BTU/hr·ft·°F), worse than 73% of copper alloy grades. Thermal expansion is 18.4 µm/m·K (10.2 µin/in·°F).
Electrical3
CC484K-GM conducts electricity at 10 % IACS, worse than 74% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (69/100), better than 72% of copper alloy grades.
Sustainability4
Producing a kilogram of CC484K-GM takes about 62 MJ of energy and emits 4.2 kg of CO₂ — more than 76% of copper alloy grades. Typical recycled content is 40%.
Manufacturability8
CC484K-GM's machinability is fair (45/100, better than 64% of copper alloy grades); weldability poor (20/100); formability not recommended (5/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CC484K-GM
Is CC484K easy to machine?
Machines to a fine finish with sharp positive-rake carbide or HSS tools, moderate speeds and flood coolant; chips are short and abrasive, expect ~30 % of AISI 1212 rate and avoid rubbing that smears the soft alpha matrix.
Can CC484K be welded?
Poor fusion weldability — high-tin bronzes hot-crack and lose Sn; repair only by low-heat TIG/braze-weld with matching CuSn filler after preheat, or by brazing.
Can CC484K be formed, bent or molded?
Casting alloy only; long freezing range needs strong directional solidification, generous risers and chills — centrifugal or continuous casting avoids inverse tin segregation and shrink porosity.
What surface finishes work on CC484K?
Takes a bright polish and natural bronze patina; can be tin-, nickel- or chrome-plated after a copper strike, but is not anodizable — running surfaces are usually just fine-turned or scraped.
CC484K 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 | 11 – 13 | 12 |
| NiC91700 uses 1.2–2.0 % Ni | 1.5 – 2.5 | 2 |
| Pdeoxidiser; hard Cu3P phase raises wear resistance | ≤ 0.6 | 0.3 |
| Pbimpurity limit | ≤ 0.7 | — |
| Zn | ≤ 0.5 | — |
| Fe | ≤ 0.2 | — |
| Sb | ≤ 0.3 | — |
| S | ≤ 0.1 | — |
| Mn | ≤ 0.2 | — |
| Alkept very low to avoid oxide films | ≤ 0.01 | — |
| Si | ≤ 0.01 | — |
| Curemainder, ~84–87 % | balance | — |
CC484K-GM — frequently asked
What is CC484K-GM used for?
CC484K-GM is typically used for worm gears, wear rings, high-load gear wheels, marine propeller components and heavy machinery bushings. In short: nickel-refined tin bronze; toughest high-tin bronze; worm-gear reference grade.
What is the yield strength of CC484K-GM?
CC484K-GM has a typical yield strength of 195 MPa (28.3 ksi) and a tensile strength of 320 MPa (46.4 ksi) — weaker than 56% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is CC484K-GM easy to machine?
Reasonably — machinability is rated fair (45/100, better than 64% of copper alloy grades). Machines to a fine finish with sharp positive-rake carbide or HSS tools, moderate speeds and flood coolant; chips are short and abrasive, expect ~30 % of AISI 1212 rate and avoid rubbing that smears the soft alpha matrix.
Can CC484K-GM be welded?
Not readily — weldability is rated poor (20/100). Poor fusion weldability — high-tin bronzes hot-crack and lose Sn; repair only by low-heat TIG/braze-weld with matching CuSn filler after preheat, or by brazing.
What surface finishes work on CC484K-GM?
Takes a bright polish and natural bronze patina; can be tin-, nickel- or chrome-plated after a copper strike, but is not anodizable — running surfaces are usually just fine-turned or scraped.
Can CC484K-GM be formed, bent or molded?
Casting alloy only; long freezing range needs strong directional solidification, generous risers and chills — centrifugal or continuous casting avoids inverse tin segregation and shrink porosity.
What is the maximum service temperature of CC484K-GM?
CC484K-GM is rated for continuous use to about 260°C (500 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CC484K-GZ and CC484K-GS?
GZ is the default condition — default for worm-wheel rims, wear rings and heavy bushes — dense, porosity-free wall with radially refined structure. GS: choose for large, one-off or complex-shaped worm wheels and bearing housings where tooling cost dominates. Yield strength is 200 MPa in GZ versus 175 MPa in GS.
Sources
- EN 1982 — Copper and copper alloys: Ingots and castings (CuSn12Ni2-C / CC484K) — CEN (2017)
- ASTM B505/B505M — Continuous-cast copper alloys (C91700) — ASTM (2018)
- CDA Alloy Datasheet C91700 (nickel gear bronze) — Copper Development Association (2023)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- GB/T 1176 (ZCuSn12Ni2) — 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.