Copper Alloy CC484K
EN CC484K
CC484K (CuSn12Ni2-C, C91700) is a high-tin cast bronze modified with about 2 % nickel for grain refinement, higher toughness and better wear resistance.
Reference datasheet — CC484K 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 GZ condition
CC484K tempers and conditions
CC484K is supplied in 4 conditions, soft to hard. GZ 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 large, one-off or complex-shaped worm wheels and bearing housings where tooling cost dominates. | 175 | 300 | 10 | 95 HB | 10 % IACS |
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?
CC484K (CuSn12Ni2-C, C91700) is a high-tin cast bronze modified with about 2 % nickel for grain refinement, higher toughness and better wear resistance. It is the classic material for heavily loaded worm gears and wear rings, supplied sand cast (GS), gravity die cast (GM), centrifugally cast (GZ) or continuously cast (GC) at 200 MPa yield, 330 MPa tensile, 10 % elongation and 105 HB, the highest elongation of the high-tin bronzes here. Fusion weldability is poor and the alloy is more expensive than plain CuSn12. Use CC483K where the nickel addition is not needed, or CC481K for maximum strength. CC484K 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). CC484K has a yield strength of 200 MPa (29 ksi) and a tensile strength of 330 MPa (47.9 ksi) — weaker than 54% of copper alloy grades. Elongation at break is 10% and the elastic modulus is 105 GPa (15.2 Msi).
What is CC484K used for?
- worm gears
- wear rings
- high-load gear wheels
- marine propeller components
- heavy machinery bushings
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 — 10%, worse than 76% of copper alloy grades
CC484K properties
Typical room-temperature values for CC484K-GZ; bars are the position among copper alloy grades.
Physical3
CC484K 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 has a yield strength of 200 MPa (29 ksi) and a tensile strength of 330 MPa (47.9 ksi) — weaker than 54% of copper alloy grades. Elongation at break is 10% and the elastic modulus is 105 GPa (15.2 Msi).
Thermal6
CC484K 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 conducts electricity at 10 % IACS, worse than 74% 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 CC484K 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's machinability is fair (45/100, better than 64% of copper alloy grades); weldability poor (20/100); formability not recommended (5/100).
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. CC484K is highlighted; hover a dot for its name, or open the interactive family chart.
Working with CC484K
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.
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 |
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.
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 CC484K in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- CuSn12Ni2-C
- Similar grades
- C91700
How much does CC484K cost?
CC484K 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.
CC484K — frequently asked
What is CC484K used for?
CC484K 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?
CC484K has a typical yield strength of 200 MPa (29 ksi) and a tensile strength of 330 MPa (47.9 ksi) — weaker than 54% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is CC484K 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 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?
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 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?
CC484K 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.
How much does CC484K cost?
CC484K 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 (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; 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.