Copper Alloy C14700-H04
Supply condition · default condition
UNS C14700 · ASTM B301
H04 = full hard
Standard stocked temper for free-machining copper rod and bar — highest strength and cleanest chip on automatics.
Values for the H04 condition
Other C14700 tempers and conditions
C14700 is listed in 8 conditions; see the grade overview at C14700.
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 |
H04DefaultThis page 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-H04?
C14700-H04 is C14700 supplied in the H04 condition — standard stocked temper for free-machining copper rod and bar — highest strength and cleanest chip on automatics. C14700-H04 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). C14700-H04 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).
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-H04 properties
Typical room-temperature values for C14700-H04; 16 are specific to this condition. Other listed values are C14700 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C14700-H04 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-H04 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-H04 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-H04 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-H04 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-H04'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. Confirm any required mill or lot documentation when quoting.
Working with C14700-H04
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.
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.
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) | — |
C14700-H04 — frequently asked
What is C14700-H04 used for?
C14700-H04 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-H04?
C14700-H04 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-H04 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-H04 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-H04?
Not anodizable; tin, nickel, silver or gold plating gives good adhesion; sulfide stringers can leave micro-pits in mirror polishing.
Can C14700-H04 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-H04?
C14700-H04 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.