Copper Alloy C43000
UNS C43000
C43000 is a wrought tin brass in the C20000–C49999 family that balances cold-worked strength with corrosion resistance, stocked in tempers from OS035 to H10.
Reference datasheet — C43000 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the H02 condition
C43000 tempers and conditions
C43000 is supplied in 8 conditions, soft to hard. H02 is the default FabDigit quotes; the values on this page are for it.
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 |
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?
C43000 is a wrought tin brass in the C20000–C49999 family that balances cold-worked strength with corrosion resistance, stocked in tempers from OS035 to H10. It is used for marine and electrical hardware and fasteners: the default condition gives 385 MPa yield, 455 MPa tensile, 20% elongation, 72 HRB and 25% IACS. It is unleaded, so machinability is only 32 (about 30% of C36000), and fusion welding is limited by zinc fume; season cracking requires stress relief after forming. Specify leaded C36000 if the part is turned in volume. C43000 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). C43000 has a yield strength of 385 MPa (55.8 ksi) and a tensile strength of 455 MPa (66 ksi) — stronger than 78% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 110 GPa (16 Msi).
What is C43000 used for?
- marine hardware
- electrical parts
- fasteners
Advantages
- Forms and bends easily — 70/100, better than 80% of copper alloy grades
- High strength — 385 MPa (55.8 ksi), better than 78% of copper alloy grades
Limitations
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
C43000 properties
Typical room-temperature values for C43000-H02; bars are the position among copper alloy grades.
Physical3
C43000 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 has a yield strength of 385 MPa (55.8 ksi) and a tensile strength of 455 MPa (66 ksi) — stronger than 78% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 110 GPa (16 Msi).
Thermal6
C43000 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 conducts electricity at 25 % IACS, better than 59% 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 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's machinability is poor (32/100, worse than 57% of copper alloy grades); weldability good (55/100); formability very good (70/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the copper alloy family
Yield strength against density for every copper alloy grade FabDigit runs. C43000 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C43000
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.
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 |
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.
Surface treatments FabDigit runs on copper alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
How much does C43000 cost?
C43000 is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
C43000 — frequently asked
What is C43000 used for?
C43000 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?
C43000 has a typical yield strength of 385 MPa (55.8 ksi) and a tensile strength of 455 MPa (66 ksi) — stronger than 78% of copper alloy grades. Strength varies by condition: see the 8 listed tempers.
Is C43000 easy to machine?
Not especially — machinability is rated poor (32/100, worse than 57% 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 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?
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 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?
C43000 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.
How much does C43000 cost?
C43000 is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.