Copper Alloy CC498K-GS (Sand cast)
Finish state
EN CC498K
Choose for one-off or large, complex housings, valve bodies and pump casings where dimensional tolerance is less critical.
Values for the GS condition
Other CC498K tempers and conditions
CC498K is listed in 4 conditions; see the grade overview at CC498K.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
GSThis page Sand cast | Choose for one-off or large, complex housings, valve bodies and pump casings where dimensional tolerance is less critical. | 110 | 230 | 15 | 65 HB | 12 % IACS |
Permanent (chill) mould cast | Choose for medium-to-large series of small parts needing finer grain, tighter tolerances and slightly higher strength than sand casting. | 130 | 260 | 13 | 72 HB | 12 % IACS |
Centrifugally cast | Choose for large-diameter bushings, wear rings and worm-wheel rims where a dense, porosity-free wall is required. | 140 | 270 | 13 | 75 HB | 12 % IACS |
GCDefault Continuously cast bar/tube | Default stock form: continuous-cast round bar and tube for machined bushings, nuts, glands and guide elements — densest structure and best machined surface. | 150 | 270 | 12 | 78 HB | 12.5 % IACS |
What is CC498K-GS?
CC498K-GS is CC498K supplied in the GS condition — choose for one-off or large, complex housings, valve bodies and pump casings where dimensional tolerance is less critical. CC498K-GS has a yield strength of 110 MPa (16 ksi) and a tensile strength of 230 MPa (33.4 ksi) — weaker than 82% of copper alloy grades. Elongation at break is 15% and the elastic modulus is 88 GPa (12.8 Msi). CC498K-GS has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 58% of copper alloy grades. It melts at 855°C (1,571 °F). GC is the default condition FabDigit quotes; GS is available on request or by drawing note.
Advantages
- Easy to machine — 80/100, better than 86% of copper alloy grades
Limitations
- Low stiffness — 88 GPa (12.8 Msi), worse than 96% of copper alloy grades
- Limited formability — 10/100, worse than 89% of copper alloy grades
- Low strength — 110 MPa (16 ksi), worse than 82% of copper alloy grades
CC498K-GS properties
Typical room-temperature values for CC498K-GS; 20 are specific to this condition. Other listed values are CC498K reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
CC498K-GS has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 58% of copper alloy grades. It melts at 855°C (1,571 °F).
Mechanical14
CC498K-GS has a yield strength of 110 MPa (16 ksi) and a tensile strength of 230 MPa (33.4 ksi) — weaker than 82% of copper alloy grades. Elongation at break is 15% and the elastic modulus is 88 GPa (12.8 Msi).
Thermal6
CC498K-GS is rated for continuous service to 250°C (482 °F). It conducts heat at 59 W/m·K (34.1 BTU/hr·ft·°F), worse than 61% of copper alloy grades. Thermal expansion is 18.5 µm/m·K (10.3 µin/in·°F).
Electrical3
CC498K-GS conducts electricity at 12 % IACS, worse than 62% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (63/100), better than 52% of copper alloy grades.
Sustainability4
Producing a kilogram of CC498K-GS takes about 50 MJ of energy and emits 3.5 kg of CO₂ — less than 89% of copper alloy grades. Typical recycled content is 60%.
Manufacturability8
CC498K-GS's machinability is very good (80/100, better than 86% of copper alloy grades); weldability poor (30/100); formability not recommended (10/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CC498K-GS
Is CC498K easy to machine?
Very free-machining thanks to the lead phase — use sharp positive-rake carbide or HSS tools, high speed, light feed and plenty of coolant; chips break short, so single-point boring of bushings gives excellent surface finish.
Can CC498K be welded?
Poor fusion weldability because lead causes hot cracking and porosity; repair by brazing or by TIG with matched Cu-Sn filler only after preheating and with acceptance of reduced properties.
Can CC498K be formed, bent or molded?
Foundry alloy with wide freezing range: feed generously with risers and chills to avoid interdendritic microporosity; not suitable for cold forming, only light coining/burnishing of machined bores.
What surface finishes work on CC498K?
Takes tin, nickel or chrome plating and chemical patination well; can be polished to a bright bronze lustre, but lead smearing may require light chemical bright-dip before plating.
CC498K 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 | 5 – 7 | 6 |
| Zn | 3 – 5 | 4 |
| Pbfree-machining / conformability addition | 1 – 3 | 2 |
| Niimpurity limit, Ni counted with Co | ≤ 2 | — |
| Feimpurity | ≤ 0.3 | — |
| Sbimpurity | ≤ 0.3 | — |
| Pimpurity | ≤ 0.1 | — |
| Simpurity | ≤ 0.1 | — |
| Alimpurity, harmful to castability | ≤ 0.01 | — |
| Siimpurity | ≤ 0.01 | — |
| Curemainder, typically 85–89 % | balance | — |
CC498K-GS — frequently asked
What is CC498K-GS used for?
CC498K-GS is typically used for valve bodies, pump housings, fittings and flanges, general hardware castings and low-to-moderate load bearing components. In short: free-machining cast bronze; stronger than gunmetal CC499K; poor fusion weldability.
What is the yield strength of CC498K-GS?
CC498K-GS has a typical yield strength of 110 MPa (16 ksi) and a tensile strength of 230 MPa (33.4 ksi) — weaker than 82% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is CC498K-GS easy to machine?
Yes — machinability is rated very good (80/100, better than 86% of copper alloy grades). Very free-machining thanks to the lead phase — use sharp positive-rake carbide or HSS tools, high speed, light feed and plenty of coolant; chips break short, so single-point boring of bushings gives excellent surface finish.
Can CC498K-GS be welded?
Not readily — weldability is rated poor (30/100). Poor fusion weldability because lead causes hot cracking and porosity; repair by brazing or by TIG with matched Cu-Sn filler only after preheating and with acceptance of reduced properties.
What surface finishes work on CC498K-GS?
Takes tin, nickel or chrome plating and chemical patination well; can be polished to a bright bronze lustre, but lead smearing may require light chemical bright-dip before plating.
Can CC498K-GS be formed, bent or molded?
Foundry alloy with wide freezing range: feed generously with risers and chills to avoid interdendritic microporosity; not suitable for cold forming, only light coining/burnishing of machined bores.
What is the maximum service temperature of CC498K-GS?
CC498K-GS 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 CC498K-GC and CC498K-GS?
GC is the default condition — default stock form: continuous-cast round bar and tube for machined bushings, nuts, glands and guide elements — densest structure and best machined surface. GS: choose for one-off or large, complex housings, valve bodies and pump casings where dimensional tolerance is less critical. Yield strength is 150 MPa in GC versus 110 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)
- CDA / copper.org cast bronze alloy datasheets — Copper Development Association (2023)
- Continuous-cast leaded tin bronze bushing bar datasheets — European and Chinese bronze foundries (2024)
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.