Copper Alloy C14520
UNS C14520
C14520 is a phosphorus-deoxidized tellurium copper in the C14500 free-machining family, tuned to balance weldability and brazability with chip control — weldability score 55, machinability 88.
Reference datasheet — C14520 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 H04 condition
C14520 tempers and conditions
C14520 is supplied in 7 conditions, soft to hard. H04 is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Choose when maximum conductivity, bending or riveting/upsetting is required after machining. | 70 | 225 | 50 | 45 HB | 93 % IACS |
As hot rolled | Mill hot-worked bar for large diameters that will be fully machined; lowest strength but best conductivity. | 95 | 235 | 40 | 50 HB | 93 % IACS |
Eighth hard | Light draw pass for straightness and size tolerance while keeping good ductility for staking or bending. | 180 | 255 | 30 | 65 HB | 92 % IACS |
Quarter hard | Intermediate temper when both moderate strength and some cold-forming (bending, flaring) are needed. | 215 | 275 | 25 | 80 HB | 92 % IACS |
Half hard | Best all-round temper for screw-machine parts that still need some bending or crimping ductility. | 240 | 290 | 20 | 88 HB | 91 % IACS |
H04Default Full hard | Standard stocked bar temper for high-volume CNC/screw-machine electrical parts — maximum strength and best chip control. | 305 | 335 | 10 | 100 HB | 90 % IACS |
Extra hard | Small-diameter wire/bar where maximum hardness and stiffness of the finished pin or contact matters. | 340 | 365 | 7 | 110 HB | 89 % IACS |
What is C14520?
C14520 is a phosphorus-deoxidized tellurium copper in the C14500 free-machining family, tuned to balance weldability and brazability with chip control — weldability score 55, machinability 88. It is supplied as rod and bar in M20, O61 and H00–H06 tempers for machined electrical fittings, with 305 MPa yield, 335 MPa tensile, 10% elongation, 90% IACS, 350 W/m·K and service to 200 °C. Arc welding is only fair because tellurium promotes hot cracking, and formability is low (score 30); C14510 is the better pick for cold-headed parts. C14520 has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 90% of copper alloy grades. It melts at 1,051°C (1,924 °F). C14520 has a yield strength of 305 MPa (44.2 ksi) and a tensile strength of 335 MPa (48.6 ksi) — stronger than 62% of copper alloy grades. Elongation at break is 10% and the elastic modulus is 117 GPa (17 Msi).
What is C14520 used for?
- machined electrical fittings
- terminals
- brazed connector components
Advantages
- Easy to machine — 88/100, better than 96% of copper alloy grades
- Conducts heat well — 350 W/m·K (202.2 BTU/hr·ft·°F), better than 88% of copper alloy grades
- High electrical conductivity — 90 % IACS, better than 87% of copper alloy grades
Limitations
- Limited ductility — 10%, worse than 76% of copper alloy grades
C14520 properties
Typical room-temperature values for C14520-H04; bars are the position among copper alloy grades.
Physical3
C14520 has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 90% of copper alloy grades. It melts at 1,051°C (1,924 °F).
Mechanical13
C14520 has a yield strength of 305 MPa (44.2 ksi) and a tensile strength of 335 MPa (48.6 ksi) — stronger than 62% of copper alloy grades. Elongation at break is 10% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C14520 is rated for continuous service to 200°C (392 °F). It conducts heat at 350 W/m·K (202.2 BTU/hr·ft·°F), better than 88% of copper alloy grades. Thermal expansion is 17.6 µm/m·K (9.78 µin/in·°F).
Electrical3
C14520 conducts electricity at 90 % IACS, better than 87% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 57% of copper alloy grades.
Sustainability4
Producing a kilogram of C14520 takes about 55 MJ of energy and emits 3.8 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 30%.
Manufacturability7
C14520's machinability is excellent (88/100, better than 96% of copper alloy grades); weldability good (55/100); formability poor (30/100).
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. C14520 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C14520
Is C14520 easy to machine?
Excellent free-cutting copper — run high speeds with sharp positive-rake carbide, light feeds and flood coolant; chips break cleanly, ~80–90 % of free-cutting brass throughput.
Can C14520 be welded?
Resistance and brazing/soldering are excellent thanks to P-deoxidation; GTAW/GMAW is only fair — tellurium can cause hot cracking, so keep heat input low and avoid heavily restrained joints.
Can C14520 be formed, bent or molded?
Anneal (450–600 °C) before severe bending or upsetting; hard tempers tolerate only mild bends because Cu₂Te particles limit ductility.
C14520 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 |
|---|---|---|
| Teforms Cu₂Te chip-breaking particles | 0.4 – 0.7 | 0.5 |
| Pdeoxidiser — prevents hydrogen embrittlement in brazing/annealing | 0 – 0.02 | 0.01 |
| CuCu + Ag + Te + P ≥ 99.90 % per CDA/ASTM B301 | ≥ 99.9 (balance) |
What surface finishes work on C14520?
Not anodisable; bright dip, mechanically polish, or electroplate with Ni/Ag/Sn (use a nickel barrier for high-temperature contacts); protect bare surfaces with lacquer or benzotriazole against tarnish.
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).
Equivalent designations
Standards and trade names that resolve to Copper Alloy C14520 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Similar grades
- C14500
How much does C14520 cost?
C14520 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.
C14520 — frequently asked
What is C14520 used for?
C14520 is typically used for machined electrical fittings, terminals and brazed connector components. In short: brazable free-machining copper; 90% IACS with chip control; better joining than C14510.
What is the yield strength of C14520?
C14520 has a typical yield strength of 305 MPa (44.2 ksi) and a tensile strength of 335 MPa (48.6 ksi) — stronger than 62% of copper alloy grades. Strength varies by condition: see the 7 listed tempers.
Is C14520 easy to machine?
Yes — machinability is rated excellent (88/100, better than 96% of copper alloy grades). Excellent free-cutting copper — run high speeds with sharp positive-rake carbide, light feeds and flood coolant; chips break cleanly, ~80–90 % of free-cutting brass throughput.
Can C14520 be welded?
Yes — weldability is rated good (55/100). Resistance and brazing/soldering are excellent thanks to P-deoxidation; GTAW/GMAW is only fair — tellurium can cause hot cracking, so keep heat input low and avoid heavily restrained joints.
What surface finishes work on C14520?
Not anodisable; bright dip, mechanically polish, or electroplate with Ni/Ag/Sn (use a nickel barrier for high-temperature contacts); protect bare surfaces with lacquer or benzotriazole against tarnish.
Can C14520 be formed, bent or molded?
Anneal (450–600 °C) before severe bending or upsetting; hard tempers tolerate only mild bends because Cu₂Te particles limit ductility.
What is the maximum service temperature of C14520?
C14520 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 C14520-H04 and C14520-O61?
H04 is the default condition — standard stocked bar temper for high-volume CNC/screw-machine electrical parts — maximum strength and best chip control. O61: choose when maximum conductivity, bending or riveting/upsetting is required after machining. Yield strength is 305 MPa in H04 versus 70 MPa in O61.
How much does C14520 cost?
C14520 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
- ASTM B301/B301M Free-Cutting Copper Rod, Bar, Wire and Shapes — ASTM International (2020)
- CDA Alloy Datasheets C14500 / C14520 (Tellurium Copper) — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- Tellurium copper bar technical data — Wieland / Aurubis (2022)
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.