Copper Alloy C33000 · supply condition
Copper Alloy C33000-H04
Properties of the H04 condition, compared with the other C33000 tempers.
Full-hard drawn condition for maximum strength, straightness and best turning finish; little cold forming left.
What is C33000-H04?
C33000-H04 is C33000 supplied in the H04 condition — full-hard drawn condition for maximum strength, straightness and best turning finish; little cold forming left. C33000-H04 has a yield strength of 390 MPa (56.6 ksi) and a tensile strength of 500 MPa (72.5 ksi) — stronger than 78% of copper alloy grades. Elongation at break is 8% and the elastic modulus is 103 GPa (14.9 Msi). C33000-H04 has a density of 8.47 g/cm³ (0.306 lb/in³), lighter than 68% of copper alloy grades. It melts at 899°C (1,650 °F). O is the default condition FabDigit quotes; H04 is available on request or by drawing note.
Advantages
- Easy to machine — 85/100, better than 93% of copper alloy grades
- High strength — 390 MPa (56.6 ksi), better than 78% of copper alloy grades
Limitations
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
- Limited ductility — 8%, worse than 83% of copper alloy grades
- Difficult to weld — 25/100, worse than 78% of copper alloy grades
C33000-H04 properties
Typical room-temperature values for C33000-H04 — 10 properties are specific to this condition; the rest are grade-level values shared by every C33000 temper. Each bar shows where the value sits among the copper alloy grades in FabDigit's library — further right is higher.
Physical3
C33000-H04 has a density of 8.47 g/cm³ (0.306 lb/in³), lighter than 68% of copper alloy grades. It melts at 899°C (1,650 °F).
Mechanical10
C33000-H04 has a yield strength of 390 MPa (56.6 ksi) and a tensile strength of 500 MPa (72.5 ksi) — stronger than 78% of copper alloy grades. Elongation at break is 8% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
C33000-H04 is rated for continuous service to 150°C (302 °F). It conducts heat at 121 W/m·K (69.9 BTU/hr·ft·°F), better than 67% of copper alloy grades. Thermal expansion is 20.2 µm/m·K (11.2 µin/in·°F).
Electrical3
C33000-H04 conducts electricity at 26 % IACS, better than 62% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 86% of copper alloy grades.
Sustainability4
Producing a kilogram of C33000-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 50%.
Manufacturability7
C33000-H04's machinability is excellent (85/100, better than 93% of copper alloy grades); weldability poor (25/100); formability poor (30/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other C33000 tempers and conditions
C33000 is also supplied in 6 other conditions. The full side-by-side table is on the C33000 overview.
- ODefaultSoftest condition — pick for tight-radius bending, expanding, flaring and forming of tube.110 MPa yield · 55 HB
- H04Full-hard drawn condition for maximum strength, straightness and best turning finish; little cold forming left.390 MPa yield · 145 HB
- H02Half-hard drawn tube/rod — good compromise of strength, screw-machine performance and moderate forming.275 MPa yield · 110 HB
Working with C33000-H04
Is C33000 easy to machine?
Free-cutting-like behaviour at ~80–90% of C36000: use positive-rake carbide or HSS, high speed, light feeds, water-soluble coolant; chips break well thanks to the 0.5% Pb.
Can C33000 be welded?
Not suited to fusion welding (lead cracking and Zn fume); join by soft soldering or silver brazing with flux and controlled heat.
Can C33000 be formed, bent or molded?
Annealed/O50 tube bends, expands, flares and knurls readily; interanneal ~425–600 °C between heavy draws and stress-relieve cold-worked parts (~250–300 °C) to avoid ammonia-induced SCC.
What surface finishes work on C33000?
Polishes to a bright yellow finish; accepts nickel/chrome plating, chemical blackening/antiquing and clear lacquer — no anodizing.
C33000 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 |
|---|---|---|
| Cu | 65 – 68 | 66 |
| Pbfree-machining addition | 0.25 – 0.7 | 0.5 |
| Fe | ≤ 0.07 | — |
| Znremainder, nominally ~33.5% | balance | — |
C33000-H04 — frequently asked
What is C33000-H04 used for?
C33000-H04 is typically used for heat exchanger and condenser tubes, gas and liquid transfer tubing, machined tube fittings, lighting fixture tubing, hardware and decorative tube and instrument and gauge lines. In short: ductile heat-exchanger brass.
What is the yield strength of C33000-H04?
C33000-H04 has a typical yield strength of 390 MPa (56.6 ksi) and a tensile strength of 500 MPa (72.5 ksi) — stronger than 78% of copper alloy grades. Strength varies by condition: see the 7 listed tempers.
Is C33000-H04 easy to machine?
Yes — machinability is rated excellent (85/100, better than 93% of copper alloy grades). Free-cutting-like behaviour at ~80–90% of C36000: use positive-rake carbide or HSS, high speed, light feeds, water-soluble coolant; chips break well thanks to the 0.5% Pb.
Can C33000-H04 be welded?
Not readily — weldability is rated poor (25/100). Not suited to fusion welding (lead cracking and Zn fume); join by soft soldering or silver brazing with flux and controlled heat.
What surface finishes work on C33000-H04?
Polishes to a bright yellow finish; accepts nickel/chrome plating, chemical blackening/antiquing and clear lacquer — no anodizing.
Can C33000-H04 be formed, bent or molded?
Annealed/O50 tube bends, expands, flares and knurls readily; interanneal ~425–600 °C between heavy draws and stress-relieve cold-worked parts (~250–300 °C) to avoid ammonia-induced SCC.
What is the maximum service temperature of C33000-H04?
C33000-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 C33000-O and C33000-H80?
O is the default condition — softest condition — pick for tight-radius bending, expanding, flaring and forming of tube. H80: heavily drawn tube for maximum burst/pressure rating and rigid straight lengths. Yield strength is 110 MPa in O versus 415 MPa in H80.
Can FabDigit make parts in C33000-H04?
Yes — C33000-H04 is available for CNC machining and sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM B135 — Seamless Brass Tube — ASTM International (2017)
- CDA Alloy Datasheet C33000 (Low-Leaded Brass Tube) — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties of Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion of Copper and Copper Alloys — 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.