Copper Alloy C69710
UNS C69710
C69710 is a leaded copper-zinc-silicon brass in extruded and drawn rod and bar form, close in composition to C69700 and stocked in O61, M30, H01, H02, H04 and HR50.
Reference datasheet — C69710 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the M30 condition
C69710 tempers and conditions
C69710 is supplied in 6 conditions, soft to hard. M30 is the default FabDigit quotes; the values on this page are for it.
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 | — |
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?
C69710 is a leaded copper-zinc-silicon brass in extruded and drawn rod and bar form, close in composition to C69700 and stocked in O61, M30, H01, H02, H04 and HR50. Default properties are 450 MPa tensile, 215 MPa yield, 25 % elongation and 120 HB (72 HRB), with electrical conductivity of only 6.7 % IACS, so it is a mechanical rather than a conductive alloy. It is selected for high-volume screw-machine fittings and valve parts, machining at roughly 80 % of C36000. Lead rules out fusion welding and cold formability is limited (score 40); use C69430 where welding or lead-free compliance is required. C69710 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). C69710 has a yield strength of 215 MPa (31.2 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 52% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 103 GPa (14.9 Msi).
What is C69710 used for?
- extruded rod for machined fittings
- valve components
- plumbing hardware
Advantages
- Easy to machine — 80/100, better than 86% of copper alloy grades
Limitations
- Poor heat conductor — 30 W/m·K (17.3 BTU/hr·ft·°F), worse than 91% of copper alloy grades
- Low electrical conductivity — 6.7 % IACS, worse than 89% of copper alloy grades
C69710 properties
Typical room-temperature values for C69710-M30; bars are the position among copper alloy grades.
Physical3
C69710 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 has a yield strength of 215 MPa (31.2 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 52% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
C69710 is rated for continuous service to 200°C (392 °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 conducts electricity at 6.7 % IACS, worse than 89% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (70/100), better than 76% of copper alloy grades.
Sustainability4
Producing a kilogram of C69710 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's machinability is very good (80/100, better than 86% of copper alloy grades); weldability fair (35/100); formability fair (40/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the copper alloy family
Yield strength against density for every copper alloy grade FabDigit runs. C69710 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C69710
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.
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 |
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.
Surface treatments FabDigit runs on copper alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
How much does C69710 cost?
C69710 is a premium-cost copper alloy ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
C69710 — frequently asked
What is C69710 used for?
C69710 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?
C69710 has a typical yield strength of 215 MPa (31.2 ksi) and a tensile strength of 450 MPa (65.3 ksi) — weaker than 52% of copper alloy grades. Strength varies by condition: see the 6 listed tempers.
Is C69710 easy to machine?
Yes — machinability is rated very good (80/100, better than 86% 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 be welded?
With care — weldability is rated fair (35/100). Fusion welding is not recommended (lead causes hot cracking); join by silver brazing, soft soldering or mechanical means.
What surface finishes work on C69710?
Buffs to a bright gold-tone finish; accepts nickel/chrome plating and clear lacquer or benzotriazole passivation; anodizing not applicable.
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 is the maximum service temperature of C69710?
C69710 is rated for continuous use to about 200°C (392 °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.
How much does C69710 cost?
C69710 is a premium-cost copper alloy ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.