Copper Alloy C41500-H04
Supply condition
UNS C41500
H04 = full hard
Standard hard temper for flat springs, washers and formed hardware with wide-radius bends only.
Values for the H04 condition
Other C41500 tempers and conditions
C41500 is listed in 9 conditions; see the grade overview at C41500.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed to 0.035 mm grain size | Softest commercial anneal for deep drawing and severe bending of tube and cup shapes. | 110 | 317 | 46 | 35 HRB | — |
Annealed to 0.015 mm grain size | Fine-grain anneal: best surface finish after forming while still fully soft. | 124 | 331 | 43 | 42 HRB | 28 % IACS |
Quarter hard | Mild temper when parts still need moderate bending but higher stiffness than annealed. | 315 | 386 | 25 | 60 HRB | — |
H02Default Half hard | Most commonly stocked strip temper: balanced strength and forming for terminals, hose and hardware. | 400 | 455 | 12 | 72 HRB | 28 % IACS |
Three-quarter hard | Higher-strength stamping temper for lightly formed contacts and clips. | 448 | 496 | 7 | 78 HRB | — |
H04This page Full hard | Standard hard temper for flat springs, washers and formed hardware with wide-radius bends only. | 483 | 524 | 5 | 82 HRB | 28 % IACS |
Extra hard | Use where high yield strength and stiffness matter more than bend formability. | 550 | 586 | 3 | 88 HRB | — |
Spring hard | Spring temper for flexible metal hose convolutions, bellows and contact springs. | 586 | 627 | 2 | 91 HRB | — |
Extra spring hard | Maximum cold-rolled strength for thin spring strip; bending essentially limited to with-grain, generous radii. | 620 | 655 | 2 | 93 HRB | — |
What is C41500-H04?
C41500-H04 is C41500 supplied in the H04 condition — standard hard temper for flat springs, washers and formed hardware with wide-radius bends only. C41500-H04 has a yield strength of 483 MPa (70.1 ksi) and a tensile strength of 524 MPa (76 ksi) — stronger than 88% of copper alloy grades. Elongation at break is 5% and the elastic modulus is 110 GPa (16 Msi). C41500-H04 has a density of 8.78 g/cm³ (0.317 lb/in³), heavier than 53% of copper alloy grades. It melts at 955°C (1,751 °F). H02 is the default condition FabDigit quotes; H04 is available on request or by drawing note.
Advantages
- High strength — 483 MPa (70.1 ksi), better than 88% of copper alloy grades
Limitations
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
- Limited ductility — 5%, worse than 93% of copper alloy grades
C41500-H04 properties
Typical room-temperature values for C41500-H04; 11 are specific to this condition. Other listed values are C41500 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C41500-H04 has a density of 8.78 g/cm³ (0.317 lb/in³), heavier than 53% of copper alloy grades. It melts at 955°C (1,751 °F).
Mechanical12
C41500-H04 has a yield strength of 483 MPa (70.1 ksi) and a tensile strength of 524 MPa (76 ksi) — stronger than 88% of copper alloy grades. Elongation at break is 5% and the elastic modulus is 110 GPa (16 Msi).
Thermal6
C41500-H04 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 18.4 µm/m·K (10.2 µin/in·°F).
Electrical3
C41500-H04 conducts electricity at 28 % IACS, better than 69% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 58% of copper alloy grades.
Sustainability4
Producing a kilogram of C41500-H04 takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 40%.
Manufacturability8
C41500-H04's machinability is fair (35/100, better than 51% of copper alloy grades); weldability fair (45/100); formability fair (35/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C41500-H04
Is C41500 easy to machine?
Machinability about 30 % of free-cutting brass — use sharp positive-rake tools, good chip breaking and flood coolant; chips are stringy in soft tempers.
Can C41500 be welded?
Resistance and brazing/soldering are excellent; fusion welding (GTAW) is only fair due to zinc fume and porosity — use low heat input and phosphor-bronze filler.
Can C41500 be formed, bent or molded?
Excellent cold forming in OS tempers (deep draw, roll form, convolute); interanneal ~450–600 °C and stress-relieve formed parts (~250 °C) to prevent ammonia SCC.
What surface finishes work on C41500?
Takes bright polishing, tin, nickel and silver plating readily; not anodizable — protect with lacquer or benzotriazole tarnish inhibitor.
C41500 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 | 89 – 93 | 91 |
| Sn | 1.5 – 2.2 | 1.8 |
| Pb | ≤ 0.1 | — |
| Fe | ≤ 0.05 | — |
| Znremainder, nominally ~7 % | balance | — |
C41500-H04 — frequently asked
What is C41500-H04 used for?
C41500-H04 is typically used for flexible hose/tube, electrical hardware and corrugated tubing. In short: formable tin brass tube; convolutes without cracking; low machinability rating.
What is the yield strength of C41500-H04?
C41500-H04 has a typical yield strength of 483 MPa (70.1 ksi) and a tensile strength of 524 MPa (76 ksi) — stronger than 88% of copper alloy grades. Strength varies by condition: see the 9 listed tempers.
Is C41500-H04 easy to machine?
Not especially — machinability is rated fair (35/100, better than 51% of copper alloy grades). Machinability about 30 % of free-cutting brass — use sharp positive-rake tools, good chip breaking and flood coolant; chips are stringy in soft tempers.
Can C41500-H04 be welded?
With care — weldability is rated fair (45/100). Resistance and brazing/soldering are excellent; fusion welding (GTAW) is only fair due to zinc fume and porosity — use low heat input and phosphor-bronze filler.
What surface finishes work on C41500-H04?
Takes bright polishing, tin, nickel and silver plating readily; not anodizable — protect with lacquer or benzotriazole tarnish inhibitor.
Can C41500-H04 be formed, bent or molded?
Excellent cold forming in OS tempers (deep draw, roll form, convolute); interanneal ~450–600 °C and stress-relieve formed parts (~250 °C) to prevent ammonia SCC.
What is the maximum service temperature of C41500-H04?
C41500-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 C41500-H02 and C41500-OS035?
H02 is the default condition — most commonly stocked strip temper: balanced strength and forming for terminals, hose and hardware. OS035: softest commercial anneal for deep drawing and severe bending of tube and cup shapes. Yield strength is 400 MPa in H02 versus 110 MPa in OS035.
Sources
- ASTM B591 Standard Specification for Copper-Zinc-Tin Alloy Plate, Sheet, Strip and Rolled Bar — ASTM International (2022)
- CDA Alloy Database — C41500 tin brass — Copper Development Association (2023)
- ASM Handbook Vol. 2: Properties and Selection — Nonferrous Alloys — ASM International (1990)
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.