Copper Alloy C34000-H04
Supply condition
UNS C34000 · EN CW600N
H04 = full hard
Pick for higher strength and stiffness in flat washers, clips and parts needing only gentle bends.
Values for the H04 condition
Other C34000 tempers and conditions
C34000 is listed in 7 conditions; see the grade overview at C34000.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Pick for maximum ductility: deep forming, heavy bending, upsetting and riveting before final work-hardening. | 110 | 330 | 55 | 58 HB | 27 % IACS |
Quarter hard | Pick when moderate bending or forming is still needed but annealed strength is too low. | 250 | 370 | 28 | 95 HB | 26 % IACS |
H02Default Half hard | Standard stock condition for screw-machine rod and fasteners: best balance of strength, chip control and residual formability. | 330 | 420 | 17 | 120 HB | 26 % IACS |
H04This page Full hard | Pick for higher strength and stiffness in flat washers, clips and parts needing only gentle bends. | 415 | 500 | 8 | 150 HB | 26 % IACS |
Extra hard | Pick for flat springs and stamped parts needing high strength with only flat or very light forming. | 450 | 550 | 5 | 160 HB | 26 % IACS |
Spring hard | Pick for spring contacts and retaining parts requiring high elastic limit; forming limited to large-radius bends. | 490 | 585 | 4 | 170 HB | 26 % IACS |
Extra spring hard | Pick only where maximum strength/stiffness is needed and no forming is required; most prone to cracking and stress-corrosion. | 515 | 620 | 3 | 178 HB | 26 % IACS |
What is C34000-H04?
C34000-H04 is C34000 supplied in the H04 condition — pick for higher strength and stiffness in flat washers, clips and parts needing only gentle bends. C34000-H04 has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 500 MPa (72.5 ksi) — stronger than 82% of copper alloy grades. Elongation at break is 8% and the elastic modulus is 103 GPa (14.9 Msi). C34000-H04 has a density of 8.47 g/cm³ (0.306 lb/in³), lighter than 68% of copper alloy grades. It melts at 900°C (1,652 °F). H02 is the default condition FabDigit quotes; H04 is available on request or by drawing note.
Advantages
- High strength — 415 MPa (60.2 ksi), better than 82% of copper alloy grades
- Easy to machine — 76/100, better than 81% of copper alloy grades
Limitations
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
- Needs corrosion protection — 48/100, worse than 96% of copper alloy grades
- Difficult to weld — 20/100, worse than 88% of copper alloy grades
- Limited ductility — 8%, worse than 83% of copper alloy grades
C34000-H04 properties
Typical room-temperature values for C34000-H04; 13 are specific to this condition. Other listed values are C34000 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C34000-H04 has a density of 8.47 g/cm³ (0.306 lb/in³), lighter than 68% of copper alloy grades. It melts at 900°C (1,652 °F).
Mechanical12
C34000-H04 has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 500 MPa (72.5 ksi) — stronger than 82% of copper alloy grades. Elongation at break is 8% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
C34000-H04 is rated for continuous service to 150°C (302 °F). It conducts heat at 115 W/m·K (66.4 BTU/hr·ft·°F), better than 61% of copper alloy grades. Thermal expansion is 20.3 µm/m·K (11.3 µin/in·°F).
Electrical3
C34000-H04 conducts electricity at 26 % IACS, better than 63% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (48/100), worse than 96% of copper alloy grades.
Sustainability4
Producing a kilogram of C34000-H04 takes about 60 MJ of energy and emits 4 kg of CO₂ — more than 69% of copper alloy grades. Typical recycled content is 55%.
Manufacturability8
C34000-H04's machinability is very good (76/100, better than 81% of copper alloy grades); weldability poor (20/100); formability fair (40/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C34000-H04
Is C34000 easy to machine?
Free-cutting at ~70 % of AISI 1212: use positive-rake carbide or HSS, high speeds, light emulsion or neat oil; lead gives short chips and excellent surface finish.
Can C34000 be welded?
Not recommended for fusion welding (lead causes hot cracking and zinc fume); join by soft soldering, silver brazing or mechanical means with good ventilation.
Can C34000 be formed, bent or molded?
Anneal at 425–600 °C for deep forming; H01/H02 handles moderate bends and thread rolling, while H06–H10 tolerate only large-radius bends.
What surface finishes work on C34000?
Takes bright dipping, buffing, Ni/Cr, tin or gold plating readily; stress-relieve at ~275 °C before service in ammonia-bearing environments and lacquer to prevent tarnish.
C34000 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 |
|---|---|---|
| CuCW600N (CuZn35Pb1) narrows this to 63.0–65.0 | 62 – 65 | 64 |
| Pbfree-machining addition | 0.8 – 1.5 | 1.1 |
| Feimpurity max | ≤ 0.15 | — |
| Znbalance, nominally ~35 % | balance | — |
C34000-H04 — frequently asked
What is C34000-H04 used for?
C34000-H04 is typically used for fasteners, rivets, screw machine parts and hardware. In short: machinable and formable brass; rod and wire fastener stock; 72 machinability with cold heading.
What is the yield strength of C34000-H04?
C34000-H04 has a typical yield strength of 415 MPa (60.2 ksi) and a tensile strength of 500 MPa (72.5 ksi) — stronger than 82% of copper alloy grades. Strength varies by condition: see the 7 listed tempers.
Is C34000-H04 easy to machine?
Yes — machinability is rated very good (76/100, better than 81% of copper alloy grades). Free-cutting at ~70 % of AISI 1212: use positive-rake carbide or HSS, high speeds, light emulsion or neat oil; lead gives short chips and excellent surface finish.
Can C34000-H04 be welded?
Not readily — weldability is rated poor (20/100). Not recommended for fusion welding (lead causes hot cracking and zinc fume); join by soft soldering, silver brazing or mechanical means with good ventilation.
What surface finishes work on C34000-H04?
Takes bright dipping, buffing, Ni/Cr, tin or gold plating readily; stress-relieve at ~275 °C before service in ammonia-bearing environments and lacquer to prevent tarnish.
Can C34000-H04 be formed, bent or molded?
Anneal at 425–600 °C for deep forming; H01/H02 handles moderate bends and thread rolling, while H06–H10 tolerate only large-radius bends.
What is the maximum service temperature of C34000-H04?
C34000-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 C34000-H02 and C34000-O60?
H02 is the default condition — standard stock condition for screw-machine rod and fasteners: best balance of strength, chip control and residual formability. O60: pick for maximum ductility: deep forming, heavy bending, upsetting and riveting before final work-hardening. Yield strength is 330 MPa in H02 versus 110 MPa in O60.
Sources
- ASTM B16 / B36 / B453 (leaded brass rod, plate, sheet) — ASTM International (2019)
- CDA Alloy Datasheet C34000 (Medium-Leaded Brass) — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties of Nonferrous Alloys — ASM International (1990)
- EN 12164 / EN 12165 — CuZn35Pb1 (CW600N) — CEN (2016)
- GB/T 4423 (HPb63-1) — SAC (2020)
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.