Copper Alloy C69300-H04
Supply condition
UNS C69300
H04 = full hard
Highest-strength drawn rod/wire for shafts, spindles and highly loaded lead-free fittings; little remaining ductility.
Values for the H04 condition
Other C69300 tempers and conditions
C69300 is listed in 7 conditions; see the grade overview at C69300.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Pick when maximum ductility for bending, flaring or upsetting of rod/tube is needed. | 210 | 480 | 35 | 120 HB | 6.5 % IACS |
As hot rolled | Use for hot-forged bodies and hot-rolled sections where forged-in properties are acceptable without further drawing. | 270 | 530 | 25 | 140 HB | 6 % IACS |
M30Default As hot extruded | Standard stock condition for lead-free brass bar and hollow rod destined for CNC-machined valves and fittings. | 290 | 550 | 25 | 145 HB | 6 % IACS |
Quarter hard | Light draw for tighter tolerance and straightness with retained ductility for mild forming. | 400 | 590 | 18 | 160 HB | 6 % IACS |
Half hard | Standard cold-drawn condition for high-strength machined parts, fasteners and stems needing good chip control and dimensional accuracy. | 480 | 650 | 13 | 180 HB | 6 % IACS |
Hard drawn | Cold-drawn hollow/tube condition for lead-free water tube and machined bushings from hollow stock. | 520 | 680 | 10 | 190 HB | 5.8 % IACS |
H04This page Full hard | Highest-strength drawn rod/wire for shafts, spindles and highly loaded lead-free fittings; little remaining ductility. | 590 | 720 | 8 | 14 HRC | 5.8 % IACS |
What is C69300-H04?
C69300-H04 is C69300 supplied in the H04 condition — highest-strength drawn rod/wire for shafts, spindles and highly loaded lead-free fittings; little remaining ductility. C69300-H04 has a yield strength of 590 MPa (85.6 ksi) and a tensile strength of 720 MPa (104 ksi) — stronger than 94% of copper alloy grades. Elongation at break is 8% and the elastic modulus is 106 GPa (15.4 Msi). C69300-H04 has a density of 8.3 g/cm³ (0.3 lb/in³), lighter than 80% of copper alloy grades. It melts at 821°C (1,510 °F). M30 is the default condition FabDigit quotes; H04 is available on request or by drawing note.
Advantages
- High strength — 590 MPa (85.6 ksi), better than 94% of copper alloy grades
- Easy to machine — 85/100, better than 93% of copper alloy grades
Limitations
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
- Low electrical conductivity — 5.8 % IACS, worse than 94% of copper alloy grades
- Poor heat conductor — 32 W/m·K (18.5 BTU/hr·ft·°F), worse than 90% of copper alloy grades
- Limited ductility — 8%, worse than 83% of copper alloy grades
C69300-H04 properties
Typical room-temperature values for C69300-H04; 21 are specific to this condition. Other listed values are C69300 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C69300-H04 has a density of 8.3 g/cm³ (0.3 lb/in³), lighter than 80% of copper alloy grades. It melts at 821°C (1,510 °F).
Mechanical13
C69300-H04 has a yield strength of 590 MPa (85.6 ksi) and a tensile strength of 720 MPa (104 ksi) — stronger than 94% of copper alloy grades. Elongation at break is 8% and the elastic modulus is 106 GPa (15.4 Msi).
Thermal6
C69300-H04 is rated for continuous service to 150°C (302 °F). It conducts heat at 32 W/m·K (18.5 BTU/hr·ft·°F), worse than 90% of copper alloy grades. Thermal expansion is 18.5 µm/m·K (10.3 µin/in·°F).
Electrical3
C69300-H04 conducts electricity at 5.8 % IACS, worse than 94% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (64/100), better than 52% of copper alloy grades.
Sustainability4
Producing a kilogram of C69300-H04 takes about 62 MJ of energy and emits 3.8 kg of CO₂ — more than 76% of copper alloy grades. Typical recycled content is 40%.
Manufacturability7
C69300-H04's machinability is excellent (85/100, better than 93% of copper alloy grades); weldability fair (40/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C69300-H04
Is C69300 easy to machine?
Machines at roughly 80 % of C36000 rates with short chips; use sharp carbide or PVD-coated tools, positive rake and generous coolant — the silicide phase is abrasive and edge wear, not chip control, sets tool life.
Can C69300 be welded?
TIG/MIG weldable with silicon-bronze filler and good local exhaust for zinc fume; keep heat input low, prefer brazing or soldering for potable-water joints.
Can C69300 be formed, bent or molded?
Excellent hot extrudability and hot forgeability (700–800 °C); cold bending and heading are limited by the duplex structure — anneal (450–550 °C) before severe cold work.
What surface finishes work on C69300?
Not anodizable; takes fine mechanical/chemical polish, and accepts Ni, Cr and Sn plating after alkaline degrease plus an activation step to strip silicon oxide.
C69300 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 | 73 – 77 | 75 |
| Siforms hard silicide phase for chip breaking | 2.7 – 3.4 | 3 |
| Pdezincification inhibitor | 0.04 – 0.15 | 0.08 |
| Pbimpurity limit — lead-free grade | ≤ 0.09 | — |
| Feimpurity limit | ≤ 0.09 | — |
| Znremainder, nominally ~21 % | balance | — |
C69300-H04 — frequently asked
What is C69300-H04 used for?
C69300-H04 is typically used for lead-free plumbing fittings, valve components and potable water hardware. In short: lead-free free-machining brass; 80 % of C36000 rates; potable-water plumbing grade.
What is the yield strength of C69300-H04?
C69300-H04 has a typical yield strength of 590 MPa (85.6 ksi) and a tensile strength of 720 MPa (104 ksi) — stronger than 94% of copper alloy grades. Strength varies by condition: see the 7 listed tempers.
Is C69300-H04 easy to machine?
Yes — machinability is rated excellent (85/100, better than 93% of copper alloy grades). Machines at roughly 80 % of C36000 rates with short chips; use sharp carbide or PVD-coated tools, positive rake and generous coolant — the silicide phase is abrasive and edge wear, not chip control, sets tool life.
Can C69300-H04 be welded?
With care — weldability is rated fair (40/100). TIG/MIG weldable with silicon-bronze filler and good local exhaust for zinc fume; keep heat input low, prefer brazing or soldering for potable-water joints.
What surface finishes work on C69300-H04?
Not anodizable; takes fine mechanical/chemical polish, and accepts Ni, Cr and Sn plating after alkaline degrease plus an activation step to strip silicon oxide.
Can C69300-H04 be formed, bent or molded?
Excellent hot extrudability and hot forgeability (700–800 °C); cold bending and heading are limited by the duplex structure — anneal (450–550 °C) before severe cold work.
What is the maximum service temperature of C69300-H04?
C69300-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 C69300-M30 and C69300-H04?
M30 is the default condition — standard stock condition for lead-free brass bar and hollow rod destined for CNC-machined valves and fittings. H04: highest-strength drawn rod/wire for shafts, spindles and highly loaded lead-free fittings; little remaining ductility. Yield strength is 290 MPa in M30 versus 590 MPa in H04.
Sources
- ASTM B371/B371M — Copper-Zinc-Silicon Alloy Rod — ASTM International (2019)
- CDA/UNS C69300 alloy datasheet — Copper Development Association (2023)
- EcoBrass / CuZn21Si3P rod and forging stock datasheet — Wieland / Diehl Metall (Mitsubishi Shindoh licence) (2022)
- ASM Handbook Vol. 2 — Properties of Nonferrous Alloys — ASM International (1990)
- EN 12164 / EN 12165 — Copper and copper alloys, rod and forging stock — CEN (2016)
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.