Copper Alloy CC492K-GM (Permanent (chill) mould cast)
Finish state
EN CC492K
Choose for medium-volume small fittings where finer grain and better surface than sand casting are needed.
Values for the GM condition
Other CC492K tempers and conditions
CC492K is listed in 4 conditions; see the grade overview at CC492K.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Sand cast | Choose for large, complex pump/valve housings and one-off castings where section size varies. | 125 | 245 | 18 | 68 HB | 14 % IACS |
GMThis page Permanent (chill) mould cast | Choose for medium-volume small fittings where finer grain and better surface than sand casting are needed. | 135 | 275 | 14 | 75 HB | 14 % IACS |
Centrifugal cast | Choose for large-diameter bushings, sleeves and worm-wheel rims needing dense, porosity-free walls. | 140 | 285 | 15 | 78 HB | 14 % IACS |
GCDefault Continuous cast bar / tube | Default stock condition — continuously cast round bar and tube for machined bushings, nuts and valve parts. | 150 | 290 | 14 | 80 HB | 14 % IACS |
What is CC492K-GM?
CC492K-GM is CC492K supplied in the GM condition — choose for medium-volume small fittings where finer grain and better surface than sand casting are needed. CC492K-GM has a yield strength of 135 MPa (19.6 ksi) and a tensile strength of 275 MPa (39.9 ksi) — weaker than 76% of copper alloy grades. Elongation at break is 14% and the elastic modulus is 97 GPa (14.1 Msi). CC492K-GM has a density of 8.75 g/cm³ (0.316 lb/in³), lighter than 51% of copper alloy grades. It melts at 850°C (1,562 °F). GC is the default condition FabDigit quotes; GM is available on request or by drawing note.
Advantages
- Easy to machine — 78/100, better than 82% of copper alloy grades
Limitations
- Low stiffness — 97 GPa (14.1 Msi), worse than 88% of copper alloy grades
- Hard to polish — 65/100, worse than 87% of copper alloy grades
- Limited formability — 15/100, worse than 79% of copper alloy grades
- Low strength — 135 MPa (19.6 ksi), worse than 76% of copper alloy grades
CC492K-GM properties
Typical room-temperature values for CC492K-GM; 21 are specific to this condition. Other listed values are CC492K reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
CC492K-GM has a density of 8.75 g/cm³ (0.316 lb/in³), lighter than 51% of copper alloy grades. It melts at 850°C (1,562 °F).
Mechanical15
CC492K-GM has a yield strength of 135 MPa (19.6 ksi) and a tensile strength of 275 MPa (39.9 ksi) — weaker than 76% of copper alloy grades. Elongation at break is 14% and the elastic modulus is 97 GPa (14.1 Msi).
Thermal6
CC492K-GM is rated for continuous service to 230°C (446 °F). It conducts heat at 68 W/m·K (39.3 BTU/hr·ft·°F), worse than 56% of copper alloy grades. Thermal expansion is 18 µm/m·K (10 µin/in·°F).
Electrical3
CC492K-GM conducts electricity at 14 % IACS, worse than 56% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (67/100), better than 66% of copper alloy grades.
Sustainability4
Producing a kilogram of CC492K-GM takes about 58 MJ of energy and emits 4 kg of CO₂ — more than 61% of copper alloy grades. Typical recycled content is 80%.
Manufacturability7
CC492K-GM's machinability is very good (78/100, better than 82% of copper alloy grades); weldability poor (30/100); formability poor (15/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CC492K-GM
Is CC492K easy to machine?
Excellent free-machining behaviour from the lead phase; use sharp positive-rake carbide or HSS tooling, high speed, light feed, soluble-oil coolant — chips break short.
Can CC492K be welded?
Fusion welding is unreliable because of lead and tin segregation; use brazing or soft soldering, or braze-repair castings with low-fuming bronze rod and preheat.
Can CC492K be formed, bent or molded?
Cast-only alloy with a wide freezing range — feed heavily with risers/chills, pour ~1100–1150 °C, and degas to avoid tin-sweat and microporosity in pressure parts.
What surface finishes work on CC492K?
Takes fine turning and burnishing well, can be tin-, nickel- or chrome-plated after thorough degreasing; mirror polishing is limited by the free lead, patinating and clear-lacquering are common.
CC492K 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 | 6 – 8 | 7 |
| Zn | 1 – 3 | 2 |
| Pb | 2 – 4 | 3 |
| Niincl. Co | ≤ 2 | — |
| Fe | ≤ 0.3 | — |
| Sb | ≤ 0.25 | — |
| Plower limit applies for weld-repaired castings | ≤ 0.1 | — |
| S | ≤ 0.1 | — |
| Mn | ≤ 0.2 | — |
| Al | ≤ 0.01 | — |
| Si | ≤ 0.01 | — |
| Cu | ≥ 84 (balance) | — |
CC492K-GM — frequently asked
What is CC492K-GM used for?
CC492K-GM is typically used for valve bodies, pump casings, fittings and steam and water service components. In short: machinability score 80; pressure-tight leaded bronze; steam-service gunmetal.
What is the yield strength of CC492K-GM?
CC492K-GM has a typical yield strength of 135 MPa (19.6 ksi) and a tensile strength of 275 MPa (39.9 ksi) — weaker than 76% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is CC492K-GM easy to machine?
Yes — machinability is rated very good (78/100, better than 82% of copper alloy grades). Excellent free-machining behaviour from the lead phase; use sharp positive-rake carbide or HSS tooling, high speed, light feed, soluble-oil coolant — chips break short.
Can CC492K-GM be welded?
Not readily — weldability is rated poor (30/100). Fusion welding is unreliable because of lead and tin segregation; use brazing or soft soldering, or braze-repair castings with low-fuming bronze rod and preheat.
What surface finishes work on CC492K-GM?
Takes fine turning and burnishing well, can be tin-, nickel- or chrome-plated after thorough degreasing; mirror polishing is limited by the free lead, patinating and clear-lacquering are common.
Can CC492K-GM be formed, bent or molded?
Cast-only alloy with a wide freezing range — feed heavily with risers/chills, pour ~1100–1150 °C, and degas to avoid tin-sweat and microporosity in pressure parts.
What is the maximum service temperature of CC492K-GM?
CC492K-GM is rated for continuous use to about 230°C (446 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CC492K-GC and CC492K-GS?
GC is the default condition — default stock condition — continuously cast round bar and tube for machined bushings, nuts and valve parts. GS: choose for large, complex pump/valve housings and one-off castings where section size varies. Yield strength is 150 MPa in GC versus 125 MPa in GS.
Sources
- EN 1982 — Copper and copper alloys: ingots and castings — CEN (2017)
- ASTM B584 — Copper Alloy Sand Castings for General Applications (C92200) — ASTM (2022)
- CDA Alloy Datasheet C92200 (Navy M bronze) — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
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.