Copper Alloy C81400-M07
Heat-treated state
UNS C81400 · EN CC140C, CuCr1-C
M07 = as continuous cast
Continuous-cast bar stock in the as-cast state, usually bought for subsequent heat treatment and machining.
Values for the M07 condition
Other C81400 tempers and conditions
C81400 is listed in 6 conditions; see the grade overview at C81400.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As sand cast | Untreated sand casting; pick when only conductivity and shape matter and strength is secondary. | 100 | 225 | 20 | 55 HB | 55 % IACS |
As centrifugally cast | Centrifugal cast rings/bushings in the as-cast state; denser and slightly stronger than sand cast. | 110 | 245 | 22 | 60 HB | 55 % IACS |
As plaster cast | Permanent-mold as-cast condition; finer grain and better surface than sand cast for repeat parts. | 110 | 240 | 20 | 60 HB | 55 % IACS |
Solution heat treated | Solution treated ~980–1000 °C and water quenched; softest, most machinable/formable state, aged afterwards to final properties. | 110 | 240 | 25 | 55 HB | 40 % IACS |
M07This page As continuous cast | Continuous-cast bar stock in the as-cast state, usually bought for subsequent heat treatment and machining. | 120 | 255 | 20 | 65 HB | 58 % IACS |
TF00Default Solution heat treated and precipitation hardened | Standard commercial condition: full strength/hardness with ~70% IACS conductivity — the state used for electrode holders, contact arms and conductive castings. | 250 | 350 | 11 | 110 HB | 70 % IACS |
What is C81400-M07?
C81400-M07 is C81400 heat treated to M07 — continuous-cast bar stock in the as-cast state, usually bought for subsequent heat treatment and machining. C81400-M07 has a yield strength of 120 MPa (17.4 ksi) and a tensile strength of 255 MPa (37 ksi) — weaker than 79% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 117 GPa (17 Msi). C81400-M07 has a density of 8.83 g/cm³ (0.319 lb/in³), heavier than 65% of copper alloy grades. It melts at 1,075°C (1,967 °F). TF00 is the default condition FabDigit quotes; M07 is available on request or by drawing note.
Advantages
- High service temperature — 300°C (572 °F), better than 85% of copper alloy grades
- High electrical conductivity — 58 % IACS, better than 81% of copper alloy grades
- Conducts heat well — 225 W/m·K (130 BTU/hr·ft·°F), better than 80% of copper alloy grades
Limitations
- Low strength — 120 MPa (17.4 ksi), worse than 79% of copper alloy grades
C81400-M07 properties
Typical room-temperature values for C81400-M07; 20 are specific to this condition. Other listed values are C81400 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C81400-M07 has a density of 8.83 g/cm³ (0.319 lb/in³), heavier than 65% of copper alloy grades. It melts at 1,075°C (1,967 °F).
Mechanical12
C81400-M07 has a yield strength of 120 MPa (17.4 ksi) and a tensile strength of 255 MPa (37 ksi) — weaker than 79% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C81400-M07 is rated for continuous service to 300°C (572 °F). It conducts heat at 225 W/m·K (130 BTU/hr·ft·°F), better than 80% of copper alloy grades. Thermal expansion is 16.6 µm/m·K (9.22 µin/in·°F).
Electrical3
C81400-M07 conducts electricity at 58 % IACS, better than 81% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (60/100), worse than 68% of copper alloy grades.
Sustainability4
Producing a kilogram of C81400-M07 takes about 57 MJ of energy and emits 3.9 kg of CO₂ — less than 52% of copper alloy grades. Typical recycled content is 30%.
Manufacturability7
C81400-M07's machinability is fair (48/100, better than 68% of copper alloy grades); weldability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C81400-M07
Is C81400 easy to machine?
Gummy like most high-conductivity coppers (~20 % of AISI 1212); machine in the aged TF00 state with sharp positive-rake carbide, high speed, light feed and flood coolant; capture beryllium-bearing dust.
Can C81400 be welded?
GTAW/EBW possible with matching or CuSi filler under argon, but the heat-affected zone over-ages — re-solution treat and re-age structural joints; ensure fume extraction for Be.
Can C81400 be formed, bent or molded?
Foundry alloy: cast in sand, permanent mold, centrifugal or continuous processes with tight melt protection to avoid chromium oxidation loss; generous risering is needed for the copper-like solidification shrinkage.
What surface finishes work on C81400?
Not anodizable; use bright dip/pickle, mechanical polish, or silver, tin or nickel plating for contact surfaces and lacquer for tarnish control.
C81400 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 |
|---|---|---|
| Crprecipitation-hardening addition | 0.6 – 1 | 0.8 |
| Begrain refiner / deoxidizer; requires beryllium dust controls | 0.02 – 0.1 | 0.06 |
| CuCu + named elements 99.5 % min | balance | — |
C81400-M07 — frequently asked
What is C81400-M07 used for?
C81400-M07 is typically used for resistance welding electrode holders, switchgear contact blocks, high-strength conductive castings and current-carrying structural parts. In short: conductive cast Cu-Cr; 70 % IACS after aging; beryllium-bearing; control dust.
What is the yield strength of C81400-M07?
C81400-M07 has a typical yield strength of 120 MPa (17.4 ksi) and a tensile strength of 255 MPa (37 ksi) — weaker than 79% of copper alloy grades. Strength varies by condition: see the 6 listed tempers.
Is C81400-M07 easy to machine?
Reasonably — machinability is rated fair (48/100, better than 68% of copper alloy grades). Gummy like most high-conductivity coppers (~20 % of AISI 1212); machine in the aged TF00 state with sharp positive-rake carbide, high speed, light feed and flood coolant; capture beryllium-bearing dust.
Can C81400-M07 be welded?
With care — weldability is rated fair (45/100). GTAW/EBW possible with matching or CuSi filler under argon, but the heat-affected zone over-ages — re-solution treat and re-age structural joints; ensure fume extraction for Be.
What surface finishes work on C81400-M07?
Not anodizable; use bright dip/pickle, mechanical polish, or silver, tin or nickel plating for contact surfaces and lacquer for tarnish control.
Can C81400-M07 be formed, bent or molded?
Foundry alloy: cast in sand, permanent mold, centrifugal or continuous processes with tight melt protection to avoid chromium oxidation loss; generous risering is needed for the copper-like solidification shrinkage.
What is the maximum service temperature of C81400-M07?
C81400-M07 is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C81400-TF00 and C81400-M01?
TF00 is the default condition — standard commercial condition: full strength/hardness with ~70% IACS conductivity — the state used for electrode holders, contact arms and conductive castings. M01: untreated sand casting; pick when only conductivity and shape matter and strength is secondary. Yield strength is 250 MPa in TF00 versus 100 MPa in M01.
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)
- ASTM B601 — Temper Designations for Copper and Copper Alloys — ASTM International (2019)
- CDA Alloy Database — C81400 chromium copper casting alloy — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
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.