Copper Alloy C34200-H10
Supply condition
UNS C34200 · ASTM B121 · EN CW601N
H10 = extra spring hard
Pick only for flat, essentially unformed spring elements needing the maximum strength available in this alloy.
Values for the H10 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 | — |
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 | — |
H10This page 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-H10?
C34200-H10 is C34200 supplied in the H10 condition — pick only for flat, essentially unformed spring elements needing the maximum strength available in this alloy. C34200-H10 has a yield strength of 505 MPa (73.2 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 90% of copper alloy grades. Elongation at break is 3% and the elastic modulus is 97 GPa (14.1 Msi). C34200-H10 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; H10 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 — 505 MPa (73.2 ksi), better than 90% of copper alloy grades
Limitations
- Limited ductility — 3%, worse than 97% of copper alloy grades
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
- Needs corrosion protection — 50/100, worse than 95% of copper alloy grades
- Limited formability — 10/100, worse than 89% of copper alloy grades
- Low stiffness — 97 GPa (14.1 Msi), worse than 88% of copper alloy grades
C34200-H10 properties
Typical room-temperature values for C34200-H10; 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-H10 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-H10 has a yield strength of 505 MPa (73.2 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 90% of copper alloy grades. Elongation at break is 3% and the elastic modulus is 97 GPa (14.1 Msi).
Thermal6
C34200-H10 is rated for continuous service to 150°C (302 °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-H10 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-H10 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-H10's machinability is excellent (92/100, better than 99% of copper alloy grades); weldability poor (20/100); formability not recommended (10/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C34200-H10
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-H10 — frequently asked
What is C34200-H10 used for?
C34200-H10 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-H10?
C34200-H10 has a typical yield strength of 505 MPa (73.2 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 90% of copper alloy grades. Strength varies by condition: see the 8 listed tempers.
Is C34200-H10 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-H10 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-H10?
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-H10 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-H10?
C34200-H10 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 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.