Copper Alloy CC497K-GS (Sand cast)
Finish state
EN CC497K
Choose for large, thick-wall or one-off bearing shells and pump bushes where section size rules out chill or continuous casting.
Values for the GS condition
Other CC497K tempers and conditions
CC497K is listed in 4 conditions; see the grade overview at CC497K.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
GSThis page Sand cast | Choose for large, thick-wall or one-off bearing shells and pump bushes where section size rules out chill or continuous casting. | 70 | 165 | 8 | 47 HB | 10.5 % IACS |
GCDefault Continuously cast bar/tube | Default stocked form: continuously cast solid bar and hollow bar for machined bushings, thrust washers and slide plates. | 85 | 195 | 9 | 52 HB | 11.5 % IACS |
Permanent-mould (chill) cast | Choose for medium-volume bushings needing a finer, denser structure and slightly higher strength than sand casting. | 85 | 190 | 8 | 52 HB | 11 % IACS |
Centrifugally cast | Choose for large-diameter, thin-wall bearing sleeves and bimetal liners where a dense, porosity-free bore is essential. | 85 | 190 | 8 | 52 HB | 11 % IACS |
What is CC497K-GS?
CC497K-GS is CC497K supplied in the GS condition — choose for large, thick-wall or one-off bearing shells and pump bushes where section size rules out chill or continuous casting. CC497K-GS has a yield strength of 70 MPa (10.2 ksi) and a tensile strength of 165 MPa (23.9 ksi) — weaker than 93% of copper alloy grades. Elongation at break is 8% and the elastic modulus is 68 GPa (9.86 Msi). CC497K-GS has a density of 9.3 g/cm³ (0.336 lb/in³), heavier than 99% of copper alloy grades. It melts at 762°C (1,404 °F). GC is the default condition FabDigit quotes; GS is available on request or by drawing note.
Advantages
- Easy to machine — 90/100, better than 98% of copper alloy grades
- Low embodied carbon — 3.2 kg CO₂/kg, better than 92% of copper alloy grades
Limitations
- Low stiffness — 68 GPa (9.86 Msi), worse than 100% of copper alloy grades
- Hard to polish — 50/100, worse than 99% of copper alloy grades
- Difficult to weld — 10/100, worse than 98% of copper alloy grades
- Low strength — 70 MPa (10.2 ksi), worse than 93% of copper alloy grades
- Limited formability — 10/100, worse than 89% of copper alloy grades
CC497K-GS properties
Typical room-temperature values for CC497K-GS; 20 are specific to this condition. Other listed values are CC497K reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
CC497K-GS has a density of 9.3 g/cm³ (0.336 lb/in³), heavier than 99% of copper alloy grades. It melts at 762°C (1,404 °F).
Mechanical14
CC497K-GS has a yield strength of 70 MPa (10.2 ksi) and a tensile strength of 165 MPa (23.9 ksi) — weaker than 93% of copper alloy grades. Elongation at break is 8% and the elastic modulus is 68 GPa (9.86 Msi).
Thermal6
CC497K-GS is rated for continuous service to 200°C (392 °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
CC497K-GS conducts electricity at 10.5 % IACS, worse than 72% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), worse than 76% of copper alloy grades.
Sustainability4
Producing a kilogram of CC497K-GS takes about 45 MJ of energy and emits 3.2 kg of CO₂ — less than 97% of copper alloy grades. Typical recycled content is 60%.
Manufacturability7
CC497K-GS's machinability is excellent (90/100, better than 98% of copper alloy grades); weldability not recommended (10/100); formability not recommended (10/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CC497K-GS
Is CC497K easy to machine?
Free-cutting: sharp positive-rake tools, high speed, light feed and copious coolant give short chips and a fine bore finish; avoid burnishing the lead phase with dull tools.
Can CC497K be welded?
Effectively unweldable by fusion processes because of the ~20 % lead phase (hot cracking, porosity); repair by mechanical means or soft solder only.
Can CC497K be formed, bent or molded?
Cast-only alloy — no cold or hot forming; melt clean and pour with controlled cooling/stirring to prevent lead gravity segregation, ideally continuous or centrifugal casting.
What surface finishes work on CC497K?
Machine-finish or diamond-bore for bearing surfaces; can be tin- or lead-tin plated for run-in; polishing is limited by lead smearing and it is not anodizable.
CC497K 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 | 4 – 6 | 5 |
| Pbsoft dispersed phase giving the bearing behaviour | 18 – 23 | 20 |
| Zn | ≤ 2 | — |
| Ni | ≤ 2 | — |
| Sb | ≤ 0.75 | — |
| Fe | ≤ 0.3 | — |
| P | ≤ 0.1 | — |
| S | ≤ 0.1 | — |
| Mn | ≤ 0.2 | — |
| Al | ≤ 0.01 | — |
| Si | ≤ 0.01 | — |
| Cu | ≥ 68 (balance) | — |
CC497K-GS — frequently asked
What is CC497K-GS used for?
CC497K-GS is typically used for heavily loaded plain bearings, crankshaft/connecting-rod bushings, marine stern-tube bearings, rolling-mill bushings and anti-friction bearing shells. In short: highest-lead bearing bronze; best dry-running tolerance; low strength, cast only.
What is the yield strength of CC497K-GS?
CC497K-GS has a typical yield strength of 70 MPa (10.2 ksi) and a tensile strength of 165 MPa (23.9 ksi) — weaker than 93% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is CC497K-GS easy to machine?
Yes — machinability is rated excellent (90/100, better than 98% of copper alloy grades). Free-cutting: sharp positive-rake tools, high speed, light feed and copious coolant give short chips and a fine bore finish; avoid burnishing the lead phase with dull tools.
Can CC497K-GS be welded?
Not readily — weldability is rated not recommended (10/100). Effectively unweldable by fusion processes because of the ~20 % lead phase (hot cracking, porosity); repair by mechanical means or soft solder only.
What surface finishes work on CC497K-GS?
Machine-finish or diamond-bore for bearing surfaces; can be tin- or lead-tin plated for run-in; polishing is limited by lead smearing and it is not anodizable.
Can CC497K-GS be formed, bent or molded?
Cast-only alloy — no cold or hot forming; melt clean and pour with controlled cooling/stirring to prevent lead gravity segregation, ideally continuous or centrifugal casting.
What is the maximum service temperature of CC497K-GS?
CC497K-GS 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 CC497K-GC and CC497K-GS?
GC is the default condition — default stocked form: continuously cast solid bar and hollow bar for machined bushings, thrust washers and slide plates. GS: choose for large, thick-wall or one-off bearing shells and pump bushes where section size rules out chill or continuous casting. Yield strength is 85 MPa in GC versus 70 MPa in GS.
Sources
- EN 1982 Copper and copper alloys — Ingots and castings — CEN (2017)
- GB/T 1176 (ZCuPb20Sn5) — SAC (2013)
- JIS H5120 Copper and copper alloy castings (CAC603) — JSA (2016)
- CDA alloy datasheet C94100 high-leaded tin bronze — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties of Copper and Copper Alloys — ASM International (1990)
- Deutsches Kupferinstitut CuSn5Pb20-C Werkstoffdatenblatt — 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.