Copper Alloy C14300-H08
Supply condition
UNS C14300 · ASTM B105
H08 = spring hard
Choose where spring force and high hardness must coexist with near-copper conductivity.
Values for the H08 condition
Other C14300 tempers and conditions
C14300 is listed in 5 conditions; see the grade overview at C14300.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed to 0.025 mm grain size | Pick for maximum formability, deep drawing or when highest conductivity is needed before final forming. | 76 | 235 | 45 | 45 HB | 93 % IACS |
Half hard | Balanced strength and bend formability for stamped current-carrying parts and terminals. | 240 | 290 | 14 | 72 HB | 92 % IACS |
H04Default Full hard | Default stock condition — hard-drawn trolley/contact wire, commutator segments and wear-resistant conductors. | 305 | 345 | 8 | 90 HB | 90 % IACS |
H08This page Spring hard | Choose where spring force and high hardness must coexist with near-copper conductivity. | 350 | 380 | 4 | 100 HB | 89 % IACS |
Extra spring hard | Maximum strength/hardness condition for thin springs, contact fingers and fine hard wire; almost no remaining formability. | 370 | 400 | 3 | 106 HB | 88 % IACS |
What is C14300-H08?
C14300-H08 is C14300 supplied in the H08 condition — choose where spring force and high hardness must coexist with near-copper conductivity. C14300-H08 has a yield strength of 350 MPa (50.8 ksi) and a tensile strength of 380 MPa (55.1 ksi) — stronger than 74% of copper alloy grades. Elongation at break is 4% and the elastic modulus is 117 GPa (17 Msi). C14300-H08 has a density of 8.89 g/cm³ (0.321 lb/in³), heavier than 72% of copper alloy grades. It melts at 1,076°C (1,969 °F). H04 is the default condition FabDigit quotes; H08 is available on request or by drawing note.
Advantages
- Conducts heat well — 348 W/m·K (201.1 BTU/hr·ft·°F), better than 87% of copper alloy grades
- High electrical conductivity — 89 % IACS, better than 87% of copper alloy grades
Limitations
- Limited ductility — 4%, worse than 96% of copper alloy grades
C14300-H08 properties
Typical room-temperature values for C14300-H08; 16 are specific to this condition. Other listed values are C14300 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C14300-H08 has a density of 8.89 g/cm³ (0.321 lb/in³), heavier than 72% of copper alloy grades. It melts at 1,076°C (1,969 °F).
Mechanical12
C14300-H08 has a yield strength of 350 MPa (50.8 ksi) and a tensile strength of 380 MPa (55.1 ksi) — stronger than 74% of copper alloy grades. Elongation at break is 4% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C14300-H08 is rated for continuous service to 180°C (356 °F). It conducts heat at 348 W/m·K (201.1 BTU/hr·ft·°F), better than 87% of copper alloy grades. Thermal expansion is 17 µm/m·K (9.44 µin/in·°F).
Electrical3
C14300-H08 conducts electricity at 89 % IACS, better than 87% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 58% of copper alloy grades.
Sustainability4
Producing a kilogram of C14300-H08 takes about 57 MJ of energy and emits 3.6 kg of CO₂ — less than 52% of copper alloy grades. Typical recycled content is 30%.
Manufacturability8
C14300-H08's machinability is poor (32/100, worse than 57% of copper alloy grades); weldability poor (30/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C14300-H08
Is C14300 easy to machine?
Machines like tough pitch copper — gummy, needs sharp positive-rake tools, high speed and flood coolant; local exhaust advised because cadmium-bearing fines/fumes are toxic.
Can C14300 be welded?
Resistance and brazing/soldering are excellent; fusion welding is difficult (high conductivity) and generates hazardous cadmium oxide fume, so forced ventilation is mandatory.
Can C14300 be formed, bent or molded?
Anneal to OS025 for deep drawing or heavy bending; H04–H10 tempers should only be gently formed and can be stress-relieved near 200 °C without much strength loss.
What surface finishes work on C14300?
Not anodizable; tin, silver or nickel plate for solderability and contact stability, or leave bright and expect a natural patina.
C14300 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 |
|---|---|---|
| Cdcadmium addition for strength and softening resistance | 0.05 – 0.15 | 0.1 |
| CuCu + Ag + Cd ≥ 99.9 % per CDA registration; oxygen-free or deoxidized base | ≥ 99.9 (balance) | — |
C14300-H08 — frequently asked
What is C14300-H08 used for?
C14300-H08 is typically used for trolley and contact wire, electrical connectors and commutator segments. In short: wear-resistant conductor copper; 90% IACS with 305 MPa yield; legacy contact-wire grade.
What is the yield strength of C14300-H08?
C14300-H08 has a typical yield strength of 350 MPa (50.8 ksi) and a tensile strength of 380 MPa (55.1 ksi) — stronger than 74% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is C14300-H08 easy to machine?
Not especially — machinability is rated poor (32/100, worse than 57% of copper alloy grades). Machines like tough pitch copper — gummy, needs sharp positive-rake tools, high speed and flood coolant; local exhaust advised because cadmium-bearing fines/fumes are toxic.
Can C14300-H08 be welded?
Not readily — weldability is rated poor (30/100). Resistance and brazing/soldering are excellent; fusion welding is difficult (high conductivity) and generates hazardous cadmium oxide fume, so forced ventilation is mandatory.
What surface finishes work on C14300-H08?
Not anodizable; tin, silver or nickel plate for solderability and contact stability, or leave bright and expect a natural patina.
Can C14300-H08 be formed, bent or molded?
Anneal to OS025 for deep drawing or heavy bending; H04–H10 tempers should only be gently formed and can be stress-relieved near 200 °C without much strength loss.
What is the maximum service temperature of C14300-H08?
C14300-H08 is rated for continuous use to about 180°C (356 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C14300-H04 and C14300-OS025?
H04 is the default condition — default stock condition — hard-drawn trolley/contact wire, commutator segments and wear-resistant conductors. OS025: pick for maximum formability, deep drawing or when highest conductivity is needed before final forming. Yield strength is 305 MPa in H04 versus 76 MPa in OS025.
Sources
- ASTM B105 — Hard-Drawn Copper Alloy Wires for Electric Conductors — ASTM International (2018)
- CDA Standard Designation C14300 alloy datasheet — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASTM B601 — Temper Designations for Copper and Copper Alloys — ASTM International (2019)
- ASM Handbook Vol.13 — Corrosion — 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.