Copper Alloy C99600
UNS C99600
C99600 is a manganese-strengthened high-strength cast copper alloy, catalogued with the cast bronzes and supplied as-cast (F) or heat treated (HT).
Reference datasheet — C99600 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 F condition
C99600 tempers and conditions
C99600 is supplied in 2 conditions, soft to hard. F is the default FabDigit quotes; the values on this page are for it.
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
FDefault As fabricated | Standard stocked condition: best vibration-damping capacity with moderate strength — pick for noise/vibration-control housings, bedplates and marine parts. | 193 | 434 | 20 | 115 HB | 2.5 % IACS |
Heat treated | Choose when higher strength and hardness are needed for gears, wear plates and heavily loaded structural castings, accepting some loss of damping and ductility. | 275 | 550 | 12 | 180 HB | 2.4 % IACS |
What is C99600?
C99600 is a manganese-strengthened high-strength cast copper alloy, catalogued with the cast bronzes and supplied as-cast (F) or heat treated (HT). Engineers use it for gears, wear plates and heavy structural sand or centrifugal castings, where 434 MPa tensile and 193 MPa yield strength come with 20% elongation, 115 HB (68 HRB) and a 96 GPa modulus. Limits are a 150 °C service ceiling, low conductivity (16 W/m·K, 2.5% IACS) and a machinability rating of 30 with only moderate corrosion resistance. Aluminum bronze C95400 is the usual alternative when seawater exposure dominates. C99600 has a density of 7.5 g/cm³ (0.271 lb/in³), lighter than 98% of copper alloy grades. It melts at 900°C (1,652 °F). C99600 has a yield strength of 193 MPa (28 ksi) and a tensile strength of 434 MPa (62.9 ksi) — weaker than 56% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 96 GPa (13.9 Msi).
What is C99600 used for?
- Gears
- Wear plates
- Heavy-duty structural castings
Advantages
- Lightweight — 7.5 g/cm³ (0.271 lb/in³), better than 98% of copper alloy grades
Limitations
- Poor heat conductor — 16 W/m·K (9.24 BTU/hr·ft·°F), worse than 100% of copper alloy grades
- Low electrical conductivity — 2.5 % IACS, worse than 100% of copper alloy grades
- Needs corrosion protection — 45/100, worse than 98% of copper alloy grades
- Hard to polish — 55/100, worse than 97% of copper alloy grades
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
C99600 properties
Typical room-temperature values for C99600-F; bars are the position among copper alloy grades.
Physical3
C99600 has a density of 7.5 g/cm³ (0.271 lb/in³), lighter than 98% of copper alloy grades. It melts at 900°C (1,652 °F).
Mechanical13
C99600 has a yield strength of 193 MPa (28 ksi) and a tensile strength of 434 MPa (62.9 ksi) — weaker than 56% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 96 GPa (13.9 Msi).
Thermal6
C99600 is rated for continuous service to 150°C (302 °F). It conducts heat at 16 W/m·K (9.24 BTU/hr·ft·°F), worse than 100% of copper alloy grades. Thermal expansion is 18.5 µm/m·K (10.3 µin/in·°F).
Electrical3
C99600 conducts electricity at 2.5 % IACS, worse than 100% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 98% of copper alloy grades.
Sustainability4
Producing a kilogram of C99600 takes about 60 MJ of energy and emits 4.5 kg of CO₂ — more than 69% of copper alloy grades. Typical recycled content is 40%.
Manufacturability8
C99600's machinability is poor (30/100, worse than 67% of copper alloy grades); weldability fair (40/100); formability poor (25/100).
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. C99600 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C99600
Is C99600 easy to machine?
Tough, work-hardening Cu-Mn matrix: use sharp positive-rake carbide, low speed (60–110 m/min), heavy feed and flood coolant to avoid built-up edge and smearing.
Can C99600 be welded?
GTAW/GMAW with matching Cu-Mn-Al filler under argon; keep interpass temperature low, avoid dilution with steel and stress-relieve to restore damping.
Can C99600 be formed, bent or molded?
Supplied as sand or centrifugal castings — degas and control Mn oxidation loss with covering flux; generous fillets and controlled solidification prevent hot tearing; cold forming is not practical.
C99600 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 |
|---|---|---|
| Mnprovides the antiferromagnetic, high-damping matrix | 39 – 45 | 42 |
| Alstrengthener / deoxidiser | 1 – 2.8 | 2 |
| Feimpurity limit | ≤ 0.25 | 0.1 |
| Curemainder, nominally ~54–58 % | balance |
What surface finishes work on C99600?
Not anodizable; use epoxy/marine paint, nickel plating or chemical conversion for corrosion protection — bare surfaces darken and can dealloy in seawater.
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).
How much does C99600 cost?
C99600 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.
C99600 — frequently asked
What is C99600 used for?
C99600 is typically used for gears, wear plates and heavy-duty structural castings. In short: high-strength cast Cu-Mn; wear-resistant gear bronze; heat-treatable cast copper.
What is the yield strength of C99600?
C99600 has a typical yield strength of 193 MPa (28 ksi) and a tensile strength of 434 MPa (62.9 ksi) — weaker than 56% of copper alloy grades. Strength varies by condition: see the 2 listed tempers.
Is C99600 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 67% of copper alloy grades). Tough, work-hardening Cu-Mn matrix: use sharp positive-rake carbide, low speed (60–110 m/min), heavy feed and flood coolant to avoid built-up edge and smearing.
Can C99600 be welded?
With care — weldability is rated fair (40/100). GTAW/GMAW with matching Cu-Mn-Al filler under argon; keep interpass temperature low, avoid dilution with steel and stress-relieve to restore damping.
What surface finishes work on C99600?
Not anodizable; use epoxy/marine paint, nickel plating or chemical conversion for corrosion protection — bare surfaces darken and can dealloy in seawater.
Can C99600 be formed, bent or molded?
Supplied as sand or centrifugal castings — degas and control Mn oxidation loss with covering flux; generous fillets and controlled solidification prevent hot tearing; cold forming is not practical.
What is the maximum service temperature of C99600?
C99600 is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C99600-F and C99600-HT?
F is the default condition — standard stocked condition: best vibration-damping capacity with moderate strength — pick for noise/vibration-control housings, bedplates and marine parts. HT: choose when higher strength and hardness are needed for gears, wear plates and heavily loaded structural castings, accepting some loss of damping and ductility. Yield strength is 193 MPa in F versus 275 MPa in HT.
How much does C99600 cost?
C99600 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
- Copper Alloy C99600 alloy data (UNS registration, special cast copper alloys) — Copper Development Association (copper.org) (2023)
- ASTM B505/B505M — Copper Alloy Continuous Castings — ASTM International (2018)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Handbook Vol. 3 — Alloy Phase Diagrams (Cu-Mn system) — ASM International (1992)
- High-damping manganese-copper alloys (INCRA project reports) — International Copper Research Association (1980)
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.