Copper Alloy C81800-M01
Finish state
UNS C81800 · ASTM B824
M01 = as sand cast
Pick when the casting will be machined heavily and heat treated later, or where strength is secondary.
Values for the M01 condition
Other C81800 tempers and conditions
C81800 is listed in 3 conditions; see the grade overview at C81800.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution heat treated | Softest, most ductile condition; used for rough machining, straightening or repair welding before ageing. | 150 | 330 | 28 | 90 HB | 22 % IACS |
M01This page As sand cast | Pick when the casting will be machined heavily and heat treated later, or where strength is secondary. | 190 | 380 | 20 | 105 HB | 30 % IACS |
TF00Default Solution heat treated and precipitation hardened | Standard supplied condition: peak strength and hardness with ~45% IACS conductivity for molds, electrodes and wear parts. | 550 | 725 | 8 | 23 HRC | 45 % IACS |
What is C81800-M01?
C81800-M01 is C81800 supplied in the M01 condition — pick when the casting will be machined heavily and heat treated later, or where strength is secondary. C81800-M01 has a yield strength of 190 MPa (27.6 ksi) and a tensile strength of 380 MPa (55.1 ksi) — weaker than 57% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 134 GPa (19.4 Msi). C81800-M01 has a density of 8.61 g/cm³ (0.311 lb/in³), lighter than 58% of copper alloy grades. It melts at 1,016°C (1,861 °F). TF00 is the default condition FabDigit quotes; M01 is available on request or by drawing note.
Advantages
- Stiff — 134 GPa (19.4 Msi), better than 93% of copper alloy grades
- Readily welded — 65/100, better than 80% of copper alloy grades
Limitations
- High embodied carbon — 5 kg CO₂/kg, worse than 86% of copper alloy grades
C81800-M01 properties
Typical room-temperature values for C81800-M01; 10 are specific to this condition. Other listed values are C81800 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C81800-M01 has a density of 8.61 g/cm³ (0.311 lb/in³), lighter than 58% of copper alloy grades. It melts at 1,016°C (1,861 °F).
Mechanical14
C81800-M01 has a yield strength of 190 MPa (27.6 ksi) and a tensile strength of 380 MPa (55.1 ksi) — weaker than 57% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 134 GPa (19.4 Msi).
Thermal6
C81800-M01 is rated for continuous service to 200°C (392 °F). It conducts heat at 150 W/m·K (86.7 BTU/hr·ft·°F), better than 72% of copper alloy grades. Thermal expansion is 17.6 µm/m·K (9.78 µin/in·°F).
Electrical3
C81800-M01 conducts electricity at 30 % IACS, better than 71% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 58% of copper alloy grades.
Sustainability4
Producing a kilogram of C81800-M01 takes about 70 MJ of energy and emits 5 kg of CO₂ — more than 84% of copper alloy grades. Typical recycled content is 35%.
Manufacturability8
C81800-M01's machinability is fair (50/100, better than 69% of copper alloy grades); weldability good (65/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C81800-M01
Is C81800 easy to machine?
Machine soft (TB00) where possible and finish after ageing with sharp carbide tools, positive rake and flood coolant; all cutting must use local exhaust and wet methods to control beryllium-bearing particulate.
Can C81800 be welded?
GTAW/GMAW with matching BeCu filler works well; weld in the solution-treated state and re-solution + re-age afterward, with fume extraction mandatory.
Can C81800 be formed, bent or molded?
Sand, permanent-mold, centrifugal and investment casting all practical; feed heavily with chills/risers because of the high thermal conductivity and moderate solidification range.
What surface finishes work on C81800?
Ages to a hard surface that takes a mirror polish for mold inserts; can be electroplated (Ni, Cr) or chemically passivated — avoid anodizing and avoid ammonia-containing cleaners.
C81800 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 |
|---|---|---|
| Be | 0.4 – 0.7 | 0.55 |
| CoCo may be partly replaced by Ni in some castings | 0.3 – 0.65 | 0.45 |
| Agcounted with Cu toward the 95% Cu min | 0.9 – 1.1 | 1 |
| Si | ≤ 0.15 | — |
| Al | ≤ 0.1 | — |
| Fe | ≤ 0.1 | — |
| Cu95.0 % min including Ag | balance | — |
C81800-M01 — frequently asked
What is C81800-M01 used for?
C81800-M01 is typically used for injection mold inserts, wear plates, bearing bushings and welding fixtures. In short: strongest cast beryllium copper here; mould inserts with high conductivity; service to 300 °C.
What is the yield strength of C81800-M01?
C81800-M01 has a typical yield strength of 190 MPa (27.6 ksi) and a tensile strength of 380 MPa (55.1 ksi) — weaker than 57% of copper alloy grades. Strength varies by condition: see the 3 listed tempers.
Is C81800-M01 easy to machine?
Reasonably — machinability is rated fair (50/100, better than 69% of copper alloy grades). Machine soft (TB00) where possible and finish after ageing with sharp carbide tools, positive rake and flood coolant; all cutting must use local exhaust and wet methods to control beryllium-bearing particulate.
Can C81800-M01 be welded?
Yes — weldability is rated good (65/100). GTAW/GMAW with matching BeCu filler works well; weld in the solution-treated state and re-solution + re-age afterward, with fume extraction mandatory.
What surface finishes work on C81800-M01?
Ages to a hard surface that takes a mirror polish for mold inserts; can be electroplated (Ni, Cr) or chemically passivated — avoid anodizing and avoid ammonia-containing cleaners.
Can C81800-M01 be formed, bent or molded?
Sand, permanent-mold, centrifugal and investment casting all practical; feed heavily with chills/risers because of the high thermal conductivity and moderate solidification range.
What is the maximum service temperature of C81800-M01?
C81800-M01 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 C81800-TF00 and C81800-TB00?
TF00 is the default condition — standard supplied condition: peak strength and hardness with ~45% IACS conductivity for molds, electrodes and wear parts. TB00: softest, most ductile condition; used for rough machining, straightening or repair welding before ageing. Yield strength is 550 MPa in TF00 versus 150 MPa in TB00.
Sources
- ASTM B770 — Copper-Beryllium Alloy Sand Castings for General Applications — ASTM International (2019)
- ASTM B824 — General Requirements for Copper Alloy Castings — ASTM International (2021)
- CDA/UNS Alloy Datasheet C81800 — Copper Development Association (2023)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Cast Beryllium Copper Alloys — properties and heat treatment — Materion Brush Performance Alloys (2022)
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.