Copper Alloy C43000-H04
Supply condition
UNS C43000
H04 = full hard
Pick for flat, high-strength contacts and hardware with minimal forming after blanking.
Values for the H04 condition
Other C43000 tempers and conditions
C43000 is listed in 8 conditions; see the grade overview at C43000.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed to 0.035 mm grain size | Pick for deep drawing, severe bending and forming before any final stress-relief. | 125 | 340 | 48 | 40 HRB | 26 % IACS |
Quarter hard | Pick when moderate strength must be combined with continued bending and light drawing. | 310 | 400 | 32 | 62 HRB | 25 % IACS |
H02Default Half hard | The general-purpose stock temper: balanced strength and formability for marine and electrical hardware. | 385 | 455 | 20 | 72 HRB | 25 % IACS |
Three-quarter hard | Pick for higher-strength stamped parts needing only gentle bends across the grain. | 430 | 495 | 12 | 78 HRB | 25 % IACS |
H04This page Full hard | Pick for flat, high-strength contacts and hardware with minimal forming after blanking. | 470 | 540 | 7 | 82 HRB | 24 % IACS |
Extra hard | Pick when yield strength and stiffness of thin strip matter more than any bending. | 540 | 605 | 4 | 88 HRB | 24 % IACS |
Spring hard | Pick for flat springs, clips and connector contacts needing high elastic limit with corrosion resistance. | 585 | 650 | 3 | 91 HRB | 24 % IACS |
Extra spring hard | Pick for the highest strength thin strip; essentially flat-form only, bends must follow the grain. | 620 | 680 | 2 | 93 HRB | 24 % IACS |
What is C43000-H04?
C43000-H04 is C43000 supplied in the H04 condition — pick for flat, high-strength contacts and hardware with minimal forming after blanking. C43000-H04 has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 540 MPa (78.3 ksi) — stronger than 87% of copper alloy grades. Elongation at break is 7% and the elastic modulus is 110 GPa (16 Msi). C43000-H04 has a density of 8.53 g/cm³ (0.308 lb/in³), lighter than 62% 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 — 470 MPa (68.2 ksi), better than 87% of copper alloy grades
Limitations
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
- Limited ductility — 7%, worse than 86% of copper alloy grades
C43000-H04 properties
Typical room-temperature values for C43000-H04; 10 are specific to this condition. Other listed values are C43000 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C43000-H04 has a density of 8.53 g/cm³ (0.308 lb/in³), lighter than 62% of copper alloy grades. It melts at 900°C (1,652 °F).
Mechanical12
C43000-H04 has a yield strength of 470 MPa (68.2 ksi) and a tensile strength of 540 MPa (78.3 ksi) — stronger than 87% of copper alloy grades. Elongation at break is 7% and the elastic modulus is 110 GPa (16 Msi).
Thermal6
C43000-H04 is rated for continuous service to 150°C (302 °F). It conducts heat at 110 W/m·K (63.6 BTU/hr·ft·°F), better than 58% of copper alloy grades. Thermal expansion is 19.1 µm/m·K (10.6 µin/in·°F).
Electrical3
C43000-H04 conducts electricity at 24 % IACS, better than 57% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (60/100), worse than 68% of copper alloy grades.
Sustainability4
Producing a kilogram of C43000-H04 takes about 60 MJ of energy and emits 3.7 kg of CO₂ — more than 69% of copper alloy grades. Typical recycled content is 40%.
Manufacturability8
C43000-H04's machinability is fair (36/100, better than 55% of copper alloy grades); weldability good (55/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C43000-H04
Is C43000 easy to machine?
Unleaded tin brass machines at roughly 30 % of free-cutting C36000 — expect stringy chips; use sharp positive-rake tools, high speed and good lubrication, or specify a leaded grade if turning volume is high.
Can C43000 be welded?
Resistance and brazing/soldering are excellent; fusion welding (GTAW with Cu-Sn or Si-bronze filler) is fair with zinc-fume extraction and low heat input.
Can C43000 be formed, bent or molded?
Excellent cold formability in OS035/H01; drawing, bending and coining are routine, with interanneal at 425–600 °C and stress-relief at 250–300 °C to avoid season cracking.
What surface finishes work on C43000?
Takes a bright mechanical or electropolish, plus tin, nickel, silver or gold plating for contacts; not anodizable — use lacquer or patina for architectural/marine trim.
C43000 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 |
|---|---|---|
| Cuincludes Ag | 84 – 87 | 85.5 |
| Sn | 1.7 – 2.7 | 2.2 |
| Pb | ≤ 0.05 | — |
| Fe | ≤ 0.05 | — |
| Znremainder, nominally ~12–13 % | balance | — |
C43000-H04 — frequently asked
What is C43000-H04 used for?
C43000-H04 is typically used for marine hardware, electrical parts and fasteners. In short: corrosion-resistant tin brass; 20% elongation at strength; unleaded, slow to machine.
What is the yield strength of C43000-H04?
C43000-H04 has a typical yield strength of 470 MPa (68.2 ksi) and a tensile strength of 540 MPa (78.3 ksi) — stronger than 87% of copper alloy grades. Strength varies by condition: see the 8 listed tempers.
Is C43000-H04 easy to machine?
Not especially — machinability is rated fair (36/100, better than 55% of copper alloy grades). Unleaded tin brass machines at roughly 30 % of free-cutting C36000 — expect stringy chips; use sharp positive-rake tools, high speed and good lubrication, or specify a leaded grade if turning volume is high.
Can C43000-H04 be welded?
Yes — weldability is rated good (55/100). Resistance and brazing/soldering are excellent; fusion welding (GTAW with Cu-Sn or Si-bronze filler) is fair with zinc-fume extraction and low heat input.
What surface finishes work on C43000-H04?
Takes a bright mechanical or electropolish, plus tin, nickel, silver or gold plating for contacts; not anodizable — use lacquer or patina for architectural/marine trim.
Can C43000-H04 be formed, bent or molded?
Excellent cold formability in OS035/H01; drawing, bending and coining are routine, with interanneal at 425–600 °C and stress-relief at 250–300 °C to avoid season cracking.
What is the maximum service temperature of C43000-H04?
C43000-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 C43000-H02 and C43000-OS035?
H02 is the default condition — the general-purpose stock temper: balanced strength and formability for marine and electrical hardware. OS035: pick for deep drawing, severe bending and forming before any final stress-relief. Yield strength is 385 MPa in H02 versus 125 MPa in OS035.
Sources
- CDA Alloy Datasheet C43000 (Tin Brass) — Copper Development Association (2023)
- ASTM B591 — Copper-Zinc-Tin Alloy Plate, Sheet, Strip and Rolled Bar — ASTM International (2022)
- ASTM B36/B36M — Brass Plate, Sheet, Strip and Rolled Bar — ASTM International (2018)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — 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.