Copper Alloy C69430-H02
Supply condition
UNS C69430
H02 = half hard
Pick where higher yield strength and cleaner machined finish are needed, e.g. valve stems and threaded fittings.
Values for the H02 condition
Other C69430 tempers and conditions
C69430 is listed in 5 conditions; see the grade overview at C69430.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Choose for maximum ductility before heavy cold forming, bending or upsetting. | 195 | 450 | 38 | 110 HB | 7 % IACS |
M30Default As hot extruded | Standard stocked condition for silicon-brass rod and forging stock; balanced strength and ductility. | 240 | 515 | 30 | 140 HB | — |
Extruded and drawn | Lightly drawn rod with better size tolerance and straightness than as-extruded, still readily machined and formed. | 310 | 585 | 25 | 155 HB | 6.5 % IACS |
H02This page Half hard | Pick where higher yield strength and cleaner machined finish are needed, e.g. valve stems and threaded fittings. | 345 | 620 | 22 | 170 HB | 6.6 % IACS |
Full hard | Maximum strength and wear resistance for stems, shafts and fasteners where little further forming is required. | 415 | 690 | 18 | 190 HB | 6.5 % IACS |
What is C69430-H02?
C69430-H02 is C69430 supplied in the H02 condition — pick where higher yield strength and cleaner machined finish are needed, e.g. valve stems and threaded fittings. C69430-H02 has a yield strength of 345 MPa (50 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 73% of copper alloy grades. Elongation at break is 22% and the elastic modulus is 103 GPa (14.9 Msi). C69430-H02 has a density of 8.3 g/cm³ (0.3 lb/in³), lighter than 80% of copper alloy grades. It melts at 820°C (1,508 °F). M30 is the default condition FabDigit quotes; H02 is available on request or by drawing note.
Advantages
- Readily welded — 72/100, better than 88% of copper alloy grades
Limitations
- Poor heat conductor — 27 W/m·K (15.6 BTU/hr·ft·°F), worse than 97% of copper alloy grades
- Low electrical conductivity — 6.6 % IACS, worse than 91% of copper alloy grades
C69430-H02 properties
Typical room-temperature values for C69430-H02; 20 are specific to this condition. Other listed values are C69430 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C69430-H02 has a density of 8.3 g/cm³ (0.3 lb/in³), lighter than 80% of copper alloy grades. It melts at 820°C (1,508 °F).
Mechanical13
C69430-H02 has a yield strength of 345 MPa (50 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 73% of copper alloy grades. Elongation at break is 22% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
C69430-H02 is rated for continuous service to 180°C (356 °F). It conducts heat at 27 W/m·K (15.6 BTU/hr·ft·°F), worse than 97% of copper alloy grades. Thermal expansion is 20.2 µm/m·K (11.2 µin/in·°F).
Electrical3
C69430-H02 conducts electricity at 6.6 % IACS, worse than 91% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (69/100), better than 72% of copper alloy grades.
Sustainability4
Producing a kilogram of C69430-H02 takes about 58 MJ of energy and emits 3.8 kg of CO₂ — more than 61% of copper alloy grades. Typical recycled content is 40%.
Manufacturability7
C69430-H02's machinability is fair (45/100, better than 64% of copper alloy grades); weldability very good (72/100); formability poor (30/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C69430-H02
Is C69430 easy to machine?
Machines like a tough alpha brass, not a leaded one — use sharp positive-rake carbide, high speed, generous coolant and chip breakers; expect ~30–40 % of C36000 productivity.
Can C69430 be welded?
One of the few brasses that welds well: GTAW/GMAW with silicon-bronze (ERCuSi-A) filler, resistance and braze welding all practical with low zinc fuming.
Can C69430 be formed, bent or molded?
Excellent hot workability at 650–800 °C for extrusion and forging; cold bending and heading are only fair, so anneal between heavy operations.
What surface finishes work on C69430?
Polishes to a bright golden finish; accepts nickel, chrome and tin plating and benzotriazole/lacquer protection — no anodizing.
C69430 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 | 80 – 83 | 81.5 |
| Si | 3.5 – 4.5 | 4 |
| Asdezincification inhibitor — distinguishes C69430 from C69400 | 0.03 – 0.06 | 0.05 |
| Pblow-lead / potable-water compliant | ≤ 0.09 | — |
| Fe | ≤ 0.2 | — |
| Znremainder, nominally ~15–16 % | balance | — |
C69430-H02 — frequently asked
What is C69430-H02 used for?
C69430-H02 is typically used for plumbing fittings, weldable brass hardware and decorative fittings. In short: weldable silicon brass; lead-free plumbing alloy; high strength, fair machining.
What is the yield strength of C69430-H02?
C69430-H02 has a typical yield strength of 345 MPa (50 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 73% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is C69430-H02 easy to machine?
Reasonably — machinability is rated fair (45/100, better than 64% of copper alloy grades). Machines like a tough alpha brass, not a leaded one — use sharp positive-rake carbide, high speed, generous coolant and chip breakers; expect ~30–40 % of C36000 productivity.
Can C69430-H02 be welded?
Yes — weldability is rated very good (72/100). One of the few brasses that welds well: GTAW/GMAW with silicon-bronze (ERCuSi-A) filler, resistance and braze welding all practical with low zinc fuming.
What surface finishes work on C69430-H02?
Polishes to a bright golden finish; accepts nickel, chrome and tin plating and benzotriazole/lacquer protection — no anodizing.
Can C69430-H02 be formed, bent or molded?
Excellent hot workability at 650–800 °C for extrusion and forging; cold bending and heading are only fair, so anneal between heavy operations.
What is the maximum service temperature of C69430-H02?
C69430-H02 is rated for continuous use to about 180°C (356 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C69430-M30 and C69430-H04?
M30 is the default condition — standard stocked condition for silicon-brass rod and forging stock; balanced strength and ductility. H04: maximum strength and wear resistance for stems, shafts and fasteners where little further forming is required. Yield strength is 240 MPa in M30 versus 415 MPa in H04.
Sources
- ASTM B371/B371M — Copper-Zinc-Silicon Alloy Rod — ASTM International (2019)
- CDA/UNS Alloy Datasheet C69400 / C69430 — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials (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.