Copper Alloy C14700
UNS C14700 · ASTM B301
C14700 is a free-machining copper to ASTM B301 that uses a small sulfur addition instead of tellurium or lead to break chips, holding electrical conductivity at 93 % IACS and thermal conductivity at 380 W/m·K.
Reference datasheet — C14700 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
C14700 tempers and conditions
C14700 is supplied in 8 conditions, soft to hard. H04 is the default FabDigit quotes; the values on this page are for it.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Choose for maximum conductivity, riveting, staking or subsequent cold heading of sulfur copper. | 70 | 225 | 50 | 45 HB | 95 % IACS |
As hot rolled | Mill-finish extruded or hot-rolled rod, used where sizes are large and only moderate strength is needed. | 80 | 235 | 45 | 50 HB | 94 % IACS |
As hot forged and air cooled | Hot-forged sulfur copper parts (switch bodies, terminals) taken straight off the press and air cooled. | 85 | 234 | 45 | 50 HB | 94 % IACS |
As forged and quenched | Forgings water-quenched off the forging heat — slightly softer/more ductile and free of scale, ready for machining. | 90 | 241 | 48 | 48 HB | 95 % IACS |
Quarter hard | Light draw for straight, dimensionally accurate rod that still bends and swages readily. | 205 | 260 | 28 | 65 HB | 94 % IACS |
Half hard | Best compromise of screw-machine performance, strength and some bending ability — common for connector pins. | 245 | 295 | 20 | 78 HB | 94 % IACS |
H04Default Full hard | Standard stocked temper for free-machining copper rod and bar — highest strength and cleanest chip on automatics. | 320 | 365 | 12 | 95 HB | 93 % IACS |
Extra hard | Used for small-diameter wire and pins needing maximum stiffness and spring-back; minimal ductility. | 365 | 400 | 7 | 105 HB | 92 % IACS |
What is C14700?
C14700 is a free-machining copper to ASTM B301 that uses a small sulfur addition instead of tellurium or lead to break chips, holding electrical conductivity at 93 % IACS and thermal conductivity at 380 W/m·K. Engineers select it for high-volume screw-machine work — connectors, terminals and precision turned parts — where its machinability rating of 85 is far more productive than tough pitch copper at 320 MPa yield and 365 MPa tensile in the default condition. Sulfur promotes hot cracking, so fusion welding is poor and joints are brazed, soldered or mechanical; service is limited to 150 °C. C14500 tellurium copper is the usual alternative. C14700 has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 90% of copper alloy grades. It melts at 1,067°C (1,953 °F). C14700 has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 365 MPa (52.9 ksi) — stronger than 68% of copper alloy grades. Elongation at break is 12% and the elastic modulus is 117 GPa (17 Msi).
What is C14700 used for?
- screw-machine parts
- electrical connectors
- precision turned components
Advantages
- Easy to machine — 85/100, better than 93% of copper alloy grades
- Conducts heat well — 380 W/m·K (219.6 BTU/hr·ft·°F), better than 91% of copper alloy grades
- High electrical conductivity — 93 % IACS, better than 90% of copper alloy grades
Limitations
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
- Difficult to weld — 25/100, worse than 78% of copper alloy grades
C14700 properties
Typical room-temperature values for C14700-H04; bars are the position among copper alloy grades.
Physical3
C14700 has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 90% of copper alloy grades. It melts at 1,067°C (1,953 °F).
Mechanical14
C14700 has a yield strength of 320 MPa (46.4 ksi) and a tensile strength of 365 MPa (52.9 ksi) — stronger than 68% of copper alloy grades. Elongation at break is 12% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C14700 is rated for continuous service to 150°C (302 °F). It conducts heat at 380 W/m·K (219.6 BTU/hr·ft·°F), better than 91% of copper alloy grades. Thermal expansion is 17.6 µm/m·K (9.78 µin/in·°F).
Electrical3
C14700 conducts electricity at 93 % IACS, better than 90% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 57% of copper alloy grades.
Sustainability4
Producing a kilogram of C14700 takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 40%.
Manufacturability8
C14700's machinability is excellent (85/100, better than 93% of copper alloy grades); weldability poor (25/100); formability fair (45/100).
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. C14700 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C14700
Is C14700 easy to machine?
Excellent on screw machines — sulfur gives short chips; use sharp positive-rake tools, high speed and flood coolant, ~85 % of free-cutting brass rate.
Can C14700 be welded?
Fusion welding is poor (sulfur promotes hot cracking); prefer brazing, soldering or resistance/friction joining.
Can C14700 be formed, bent or molded?
Hot forges and extrudes well at 750–875 °C; cold bending/heading limited in H04 — anneal at 400–600 °C for severe forming.
C14700 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 |
|---|---|---|
| Sforms dispersed Cu₂S chip breakers | 0.2 – 0.5 | 0.35 |
| Pdeoxidizer, kept low to protect conductivity | 0 – 0.01 | 0 |
| CuCu + Ag, 99.90 % min excluding S and P per CDA/ASTM B301 | ≥ 99.9 (balance) |
What surface finishes work on C14700?
Not anodizable; tin, nickel, silver or gold plating gives good adhesion; sulfide stringers can leave micro-pits in mirror polishing.
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 C14700 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B301
How much does C14700 cost?
C14700 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.
C14700 — frequently asked
What is C14700 used for?
C14700 is typically used for screw-machine parts, electrical connectors and precision turned components. In short: free-machining at 93 % IACS; lead-free chip breaking; machinability rating 85.
What is the yield strength of C14700?
C14700 has a typical yield strength of 320 MPa (46.4 ksi) and a tensile strength of 365 MPa (52.9 ksi) — stronger than 68% of copper alloy grades. Strength varies by condition: see the 8 listed tempers.
Is C14700 easy to machine?
Yes — machinability is rated excellent (85/100, better than 93% of copper alloy grades). Excellent on screw machines — sulfur gives short chips; use sharp positive-rake tools, high speed and flood coolant, ~85 % of free-cutting brass rate.
Can C14700 be welded?
Not readily — weldability is rated poor (25/100). Fusion welding is poor (sulfur promotes hot cracking); prefer brazing, soldering or resistance/friction joining.
What surface finishes work on C14700?
Not anodizable; tin, nickel, silver or gold plating gives good adhesion; sulfide stringers can leave micro-pits in mirror polishing.
Can C14700 be formed, bent or molded?
Hot forges and extrudes well at 750–875 °C; cold bending/heading limited in H04 — anneal at 400–600 °C for severe forming.
What is the maximum service temperature of C14700?
C14700 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 C14700-H04 and C14700-O60?
H04 is the default condition — standard stocked temper for free-machining copper rod and bar — highest strength and cleanest chip on automatics. O60: choose for maximum conductivity, riveting, staking or subsequent cold heading of sulfur copper. Yield strength is 320 MPa in H04 versus 70 MPa in O60.
How much does C14700 cost?
C14700 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 (2018)
- Copper Alloy C14700 alloy datasheet — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials (copper alloys) — ASM International (2005)
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.