Copper Alloy C32000-H04
Supply condition
UNS C32000
H04 = full hard
Choose for maximum strength, straightness and thread-rolling stiffness where no further forming is required.
Values for the H04 condition
Other C32000 tempers and conditions
C32000 is listed in 7 conditions; see the grade overview at C32000.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Pick for maximum ductility when parts must be bent, flared, swaged or spun after supply. | 95 | 275 | 55 | 55 HB | 37 % IACS |
Light annealed | Use when annealed formability is needed but slightly higher strength and better surface than full soft temper is wanted. | 120 | 295 | 48 | 65 HB | 37 % IACS |
Quarter hard | Compromise temper for parts that need moderate bending plus better rigidity than annealed stock. | 205 | 315 | 35 | 85 HB | 36 % IACS |
Light drawn tube | Tube-specific temper for fittings and instrument lines that still need bending and flaring. | 230 | 325 | 30 | 90 HB | 36 % IACS |
H02Default Half hard | Default stock condition for screw-machine fittings: best balance of chip control, strength and residual ductility. | 270 | 350 | 25 | 100 HB | 36 % IACS |
H04This page Full hard | Choose for maximum strength, straightness and thread-rolling stiffness where no further forming is required. | 340 | 415 | 12 | 125 HB | 35 % IACS |
Hard drawn | Highest-strength tube temper for pressure-carrying, non-formed fitting bodies. | 345 | 415 | 10 | 130 HB | 35 % IACS |
What is C32000-H04?
C32000-H04 is C32000 supplied in the H04 condition — choose for maximum strength, straightness and thread-rolling stiffness where no further forming is required. C32000-H04 has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 415 MPa (60.2 ksi) — stronger than 71% of copper alloy grades. Elongation at break is 12% and the elastic modulus is 117 GPa (17 Msi). C32000-H04 has a density of 8.75 g/cm³ (0.316 lb/in³), lighter than 51% of copper alloy grades. It melts at 980°C (1,796 °F). H02 is the default condition FabDigit quotes; H04 is available on request or by drawing note.
Advantages
- Easy to machine — 82/100, better than 90% of copper alloy grades
Limitations
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
- Difficult to weld — 20/100, worse than 88% of copper alloy grades
C32000-H04 properties
Typical room-temperature values for C32000-H04; 12 are specific to this condition. Other listed values are C32000 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C32000-H04 has a density of 8.75 g/cm³ (0.316 lb/in³), lighter than 51% of copper alloy grades. It melts at 980°C (1,796 °F).
Mechanical11
C32000-H04 has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 415 MPa (60.2 ksi) — stronger than 71% of copper alloy grades. Elongation at break is 12% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C32000-H04 is rated for continuous service to 150°C (302 °F). It conducts heat at 151 W/m·K (87.2 BTU/hr·ft·°F), better than 73% of copper alloy grades. Thermal expansion is 18.7 µm/m·K (10.4 µin/in·°F).
Electrical3
C32000-H04 conducts electricity at 35 % IACS, better than 73% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 57% of copper alloy grades.
Sustainability4
Producing a kilogram of C32000-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 45%.
Manufacturability8
C32000-H04's machinability is very good (82/100, better than 90% 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 C32000-H04
Is C32000 easy to machine?
Excellent screw-machine alloy (≈80 % of C36000): use positive-rake carbide or HSS, high speeds, light feeds and neutral cutting oil; lead gives short chips but requires lead-safe swarf handling.
Can C32000 be welded?
Not suited to fusion welding because of lead hot-shortness — join by soft soldering (excellent) or low-temperature brazing with careful joint prep and flux.
Can C32000 be formed, bent or molded?
Cold-form only in O50/O60 or H01 tempers; hot working is poor due to lead, so upsetting and heading are done cold with intermediate anneals near 425–600 °C.
What surface finishes work on C32000?
Takes bright polishing, tin/nickel/chrome plating and chemical antique patinas; no anodizing — lacquer or clear-coat to stop tarnish, and avoid ammonia-based cleaners to prevent SCC.
C32000 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 |
|---|---|---|
| CuCu + named elements ≥ 99.5 % | 83.5 – 86.5 | 85 |
| Pbfree-machining addition | 1.5 – 2.2 | 1.9 |
| Fe | ≤ 0.1 | — |
| Znremainder, nominally ~13 % | balance | — |
C32000-H04 — frequently asked
What is C32000-H04 used for?
C32000-H04 is typically used for machined fittings, valve components and plumbing hardware. In short: machinable red brass; 80% of C36000 machinability; corrosion-resistant turning stock.
What is the yield strength of C32000-H04?
C32000-H04 has a typical yield strength of 340 MPa (49.3 ksi) and a tensile strength of 415 MPa (60.2 ksi) — stronger than 71% of copper alloy grades. Strength varies by condition: see the 7 listed tempers.
Is C32000-H04 easy to machine?
Yes — machinability is rated very good (82/100, better than 90% of copper alloy grades). Excellent screw-machine alloy (≈80 % of C36000): use positive-rake carbide or HSS, high speeds, light feeds and neutral cutting oil; lead gives short chips but requires lead-safe swarf handling.
Can C32000-H04 be welded?
Not readily — weldability is rated poor (20/100). Not suited to fusion welding because of lead hot-shortness — join by soft soldering (excellent) or low-temperature brazing with careful joint prep and flux.
What surface finishes work on C32000-H04?
Takes bright polishing, tin/nickel/chrome plating and chemical antique patinas; no anodizing — lacquer or clear-coat to stop tarnish, and avoid ammonia-based cleaners to prevent SCC.
Can C32000-H04 be formed, bent or molded?
Cold-form only in O50/O60 or H01 tempers; hot working is poor due to lead, so upsetting and heading are done cold with intermediate anneals near 425–600 °C.
What is the maximum service temperature of C32000-H04?
C32000-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 C32000-H02 and C32000-O60?
H02 is the default condition — default stock condition for screw-machine fittings: best balance of chip control, strength and residual ductility. O60: pick for maximum ductility when parts must be bent, flared, swaged or spun after supply. Yield strength is 270 MPa in H02 versus 95 MPa in O60.
Sources
- ASTM B140/B140M — Copper-Zinc-Lead (Leaded Red Brass) Rod, Bar and Shapes — ASTM International (2019)
- CDA Alloy Database — C32000 leaded red brass — Copper Development Association (2024)
- ASM Handbook Vol. 2 — Properties of Copper and Copper 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.