Copper Alloy C34200-H04
Supply condition
UNS C34200 · ASTM B121 · EN CW601N
H04 = full hard
Pick for blanked/pierced flat parts and screw-machine stock needing higher strength and clean shear edges.
Values for the H04 condition
Other C34200 tempers and conditions
C34200 is listed in 8 conditions; see the grade overview at C34200.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Pick for maximum ductility when the part is bent, formed or riveted before final machining. | 125 | 340 | 50 | 70 HB | — |
As hot rolled | Pick for thicker rolled bar and plate where mill hot-rolled condition is machined all over. | 150 | 360 | 40 | 80 HB | 26 % IACS |
Quarter hard | Pick when moderate bending/forming is still required but soft temper is too weak. | 270 | 400 | 25 | 105 HB | — |
H02Default Half hard | Default stock temper — best all-round balance of strength, chip control and mild formability. | 340 | 435 | 18 | 120 HB | — |
H04This page Full hard | Pick for blanked/pierced flat parts and screw-machine stock needing higher strength and clean shear edges. | 400 | 490 | 10 | 150 HB | — |
Extra hard | Pick for flat contacts and stampings that must resist deflection with only slight bending. | 450 | 545 | 6 | 165 HB | — |
Spring hard | Pick for flat springs, clips and detents where high elastic limit matters more than ductility. | 485 | 585 | 4 | 175 HB | — |
Extra spring hard | Pick only for flat, essentially unformed spring elements needing the maximum strength available in this alloy. | 505 | 620 | 3 | 185 HB | — |
What is C34200-H04?
C34200-H04 is C34200 supplied in the H04 condition — pick for blanked/pierced flat parts and screw-machine stock needing higher strength and clean shear edges. C34200-H04 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 490 MPa (71.1 ksi) — stronger than 80% of copper alloy grades. Elongation at break is 10% and the elastic modulus is 97 GPa (14.1 Msi). C34200-H04 has a density of 8.47 g/cm³ (0.306 lb/in³), lighter than 68% of copper alloy grades. It melts at 885°C (1,625 °F). H02 is the default condition FabDigit quotes; H04 is available on request or by drawing note.
Advantages
- Easy to machine — 92/100, better than 99% of copper alloy grades
- Low embodied carbon — 3 kg CO₂/kg, better than 97% of copper alloy grades
- High strength — 400 MPa (58 ksi), better than 80% of copper alloy grades
Limitations
- Needs corrosion protection — 50/100, worse than 95% of copper alloy grades
- Low stiffness — 97 GPa (14.1 Msi), worse than 88% of copper alloy grades
- Difficult to weld — 20/100, worse than 88% of copper alloy grades
- Limited ductility — 10%, worse than 76% of copper alloy grades
C34200-H04 properties
Typical room-temperature values for C34200-H04; 12 are specific to this condition. Other listed values are C34200 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C34200-H04 has a density of 8.47 g/cm³ (0.306 lb/in³), lighter than 68% of copper alloy grades. It melts at 885°C (1,625 °F).
Mechanical12
C34200-H04 has a yield strength of 400 MPa (58 ksi) and a tensile strength of 490 MPa (71.1 ksi) — stronger than 80% of copper alloy grades. Elongation at break is 10% and the elastic modulus is 97 GPa (14.1 Msi).
Thermal6
C34200-H04 is rated for continuous service to 180°C (356 °F). It conducts heat at 116 W/m·K (67 BTU/hr·ft·°F), better than 64% of copper alloy grades. Thermal expansion is 20.3 µm/m·K (11.3 µin/in·°F).
Electrical3
C34200-H04 conducts electricity at 26 % IACS, better than 63% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (50/100), worse than 95% of copper alloy grades.
Sustainability4
Producing a kilogram of C34200-H04 takes about 48 MJ of energy and emits 3 kg of CO₂ — less than 92% of copper alloy grades. Typical recycled content is 70%.
Manufacturability8
C34200-H04's machinability is excellent (92/100, better than 99% of copper alloy grades); weldability poor (20/100); formability poor (30/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C34200-H04
Is C34200 easy to machine?
Excellent free-cutting behaviour (≈90 % of C36000); use zero-to-negative rake, high speeds, light oil or dry, and expect short crumbly chips.
Can C34200 be welded?
Not recommended for fusion welding (lead causes hot cracking); join by soft soldering, silver brazing, riveting or press fit.
Can C34200 be formed, bent or molded?
Cold-form only in O60/H01 tempers with generous bend radii; hot working is poor because of the lead phase — avoid hot forging in the 600–800 °C range.
What surface finishes work on C34200?
Bright-dips, tumbles and buffs readily; takes Ni, Cr, Sn and Ag plating well — do not anodize; stress-relieve (250–300 °C) formed parts to avoid SCC and consider lacquer to prevent tarnish.
C34200 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 |
|---|---|---|
| CuASTM B121 alloy C34200 | 62 – 65 | 63.5 |
| Pbfree-machining addition | 1.5 – 2.5 | 2 |
| Fe | ≤ 0.15 | — |
| Zn | balance | — |
C34200-H04 — frequently asked
What is C34200-H04 used for?
C34200-H04 is typically used for screw machine parts, fasteners and small precision components. In short: free-machining rod brass; 90 machinability rating; strength above plain yellow brass.
What is the yield strength of C34200-H04?
C34200-H04 has a typical yield strength of 400 MPa (58 ksi) and a tensile strength of 490 MPa (71.1 ksi) — stronger than 80% of copper alloy grades. Strength varies by condition: see the 8 listed tempers.
Is C34200-H04 easy to machine?
Yes — machinability is rated excellent (92/100, better than 99% of copper alloy grades). Excellent free-cutting behaviour (≈90 % of C36000); use zero-to-negative rake, high speeds, light oil or dry, and expect short crumbly chips.
Can C34200-H04 be welded?
Not readily — weldability is rated poor (20/100). Not recommended for fusion welding (lead causes hot cracking); join by soft soldering, silver brazing, riveting or press fit.
What surface finishes work on C34200-H04?
Bright-dips, tumbles and buffs readily; takes Ni, Cr, Sn and Ag plating well — do not anodize; stress-relieve (250–300 °C) formed parts to avoid SCC and consider lacquer to prevent tarnish.
Can C34200-H04 be formed, bent or molded?
Cold-form only in O60/H01 tempers with generous bend radii; hot working is poor because of the lead phase — avoid hot forging in the 600–800 °C range.
What is the maximum service temperature of C34200-H04?
C34200-H04 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 C34200-H02 and C34200-O60?
H02 is the default condition — default stock temper — best all-round balance of strength, chip control and mild formability. O60: pick for maximum ductility when the part is bent, formed or riveted before final machining. Yield strength is 340 MPa in H02 versus 125 MPa in O60.
Sources
- ASTM B121/B121M — Leaded Brass Plate, Sheet, Strip and Rolled Bar — ASTM International (2020)
- Copper Alloy C34200 alloy datasheet — Copper Development Association (copper.org) (2024)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- GB/T 4423 / GB/T 2059 — HPb63-3 — SAC (2020)
- EN 12164 / EN 12165 — Copper and copper alloys, rod and forging stock (CW601N) — CEN (2016)
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.