Copper Alloy C69710-H04
Supply condition
UNS C69710
H04 = full hard
Heavy draw for maximum strength and wear resistance in shafts, pins and fasteners where little forming follows.
Values for the H04 condition
Other C69710 tempers and conditions
C69710 is listed in 6 conditions; see the grade overview at C69710.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Choose when maximum ductility for bending, upsetting or cold heading is required. | 170 | 400 | 35 | 95 HB | 6.9 % IACS |
M30Default As hot extruded | Standard stock condition for extruded silicon-brass rod destined for screw-machine parts and forging blanks. | 215 | 450 | 25 | 120 HB | 6.7 % IACS |
Quarter hard | Light draw for improved straightness, size tolerance and surface finish with retained bendability. | 300 | 500 | 18 | 140 HB | 6.7 % IACS |
Drawn and stress-relieved | Use when residual stresses from drawing must be removed to avoid distortion after machining. | 360 | 530 | 14 | 150 HB | 6.5 % IACS |
Half hard | Most common drawn condition — best combination of strength, chip control and dimensional accuracy for automatic machining. | 380 | 550 | 12 | 160 HB | — |
H04This page Full hard | Heavy draw for maximum strength and wear resistance in shafts, pins and fasteners where little forming follows. | 480 | 620 | 8 | 185 HB | 6.5 % IACS |
What is C69710-H04?
C69710-H04 is C69710 supplied in the H04 condition — heavy draw for maximum strength and wear resistance in shafts, pins and fasteners where little forming follows. C69710-H04 has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 88% of copper alloy grades. Elongation at break is 8% and the elastic modulus is 103 GPa (14.9 Msi). C69710-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
- Easy to machine — 85/100, better than 93% of copper alloy grades
- High strength — 480 MPa (69.6 ksi), better than 88% of copper alloy grades
Limitations
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
- Poor heat conductor — 30 W/m·K (17.3 BTU/hr·ft·°F), worse than 91% of copper alloy grades
- Low electrical conductivity — 6.5 % IACS, worse than 91% of copper alloy grades
- Limited ductility — 8%, worse than 83% of copper alloy grades
- Limited formability — 15/100, worse than 79% of copper alloy grades
C69710-H04 properties
Typical room-temperature values for C69710-H04; 20 are specific to this condition. Other listed values are C69710 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C69710-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
C69710-H04 has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 88% of copper alloy grades. Elongation at break is 8% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
C69710-H04 is rated for continuous service to 150°C (302 °F). It conducts heat at 30 W/m·K (17.3 BTU/hr·ft·°F), worse than 91% of copper alloy grades. Thermal expansion is 20.2 µm/m·K (11.2 µin/in·°F).
Electrical3
C69710-H04 conducts electricity at 6.5 % IACS, worse than 91% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 58% of copper alloy grades.
Sustainability4
Producing a kilogram of C69710-H04 takes about 60 MJ of energy and emits 3.8 kg of CO₂ — more than 69% of copper alloy grades. Typical recycled content is 50%.
Manufacturability7
C69710-H04's machinability is excellent (85/100, better than 93% of copper alloy grades); weldability poor (30/100); formability poor (15/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C69710-H04
Is C69710 easy to machine?
Machines like a free-cutting brass at ~80% of C36000 — use sharp positive-rake carbide or HSS, high speed, light feeds; chips are short but tougher than 60/40 leaded brass.
Can C69710 be welded?
Fusion welding is not recommended (lead causes hot cracking); join by silver brazing, soft soldering or mechanical means.
Can C69710 be formed, bent or molded?
Excellent hot extrudability and forgeability at 650–750 °C; cold forming limited — anneal ~500–550 °C between heavy draws or bends.
What surface finishes work on C69710?
Buffs to a bright gold-tone finish; accepts nickel/chrome plating and clear lacquer or benzotriazole passivation; anodizing not applicable.
C69710 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 | 75 – 80 | 77.5 |
| Siforms silicide/κ phase, suppresses dezincification | 2.7 – 3.4 | 3 |
| Pbfree-machining addition | 0.8 – 1.5 | 1 |
| Feimpurity limit | ≤ 0.2 | — |
| Znbalance, nominally ~18–20% | balance | — |
C69710-H04 — frequently asked
What is C69710-H04 used for?
C69710-H04 is typically used for extruded rod for machined fittings, valve components and plumbing hardware. In short: best-machining silicon brass; rod and bar stock grade; low conductivity, 6.7 % IACS.
What is the yield strength of C69710-H04?
C69710-H04 has a typical yield strength of 480 MPa (69.6 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 88% of copper alloy grades. Strength varies by condition: see the 6 listed tempers.
Is C69710-H04 easy to machine?
Yes — machinability is rated excellent (85/100, better than 93% of copper alloy grades). Machines like a free-cutting brass at ~80% of C36000 — use sharp positive-rake carbide or HSS, high speed, light feeds; chips are short but tougher than 60/40 leaded brass.
Can C69710-H04 be welded?
Not readily — weldability is rated poor (30/100). Fusion welding is not recommended (lead causes hot cracking); join by silver brazing, soft soldering or mechanical means.
What surface finishes work on C69710-H04?
Buffs to a bright gold-tone finish; accepts nickel/chrome plating and clear lacquer or benzotriazole passivation; anodizing not applicable.
Can C69710-H04 be formed, bent or molded?
Excellent hot extrudability and forgeability at 650–750 °C; cold forming limited — anneal ~500–550 °C between heavy draws or bends.
What is the maximum service temperature of C69710-H04?
C69710-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 C69710-M30 and C69710-H04?
M30 is the default condition — standard stock condition for extruded silicon-brass rod destined for screw-machine parts and forging blanks. H04: heavy draw for maximum strength and wear resistance in shafts, pins and fasteners where little forming follows. Yield strength is 215 MPa in M30 versus 480 MPa in H04.
Sources
- ASTM B928 / UNS C697xx alloy registration (Copper Development Association) — CDA / ASTM (2020)
- CDA Alloy Database — C69700 silicon leaded brass properties — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: 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.