Copper Alloy C28000 · supply condition
Copper Alloy C28000-H06
Properties of the H06 condition, compared with the other C28000 tempers.
Maximum practical cold-work temper for 60/40 brass — highest strength and hardness with very low ductility, used for flat springs, stiff strip and wear plates.
What is C28000-H06?
C28000-H06 is C28000 supplied in the H06 condition — maximum practical cold-work temper for 60/40 brass — highest strength and hardness with very low ductility, used for flat springs, stiff strip and wear plates. C28000-H06 has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 570 MPa (82.7 ksi) — stronger than 86% of copper alloy grades. Elongation at break is 6% and the elastic modulus is 105 GPa (15.2 Msi). C28000-H06 has a density of 8.39 g/cm³ (0.303 lb/in³), lighter than 76% of copper alloy grades. It melts at 899°C (1,650 °F). O is the default condition FabDigit quotes; H06 is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 88/100, better than 97% of copper alloy grades
- Low embodied carbon — 3.1 kg CO₂/kg, better than 96% of copper alloy grades
- High strength — 450 MPa (65.3 ksi), better than 86% of copper alloy grades
Limitations
- Limited service temperature — 130°C (266 °F), worse than 100% of copper alloy grades
- Needs corrosion protection — 48/100, worse than 96% of copper alloy grades
- Limited ductility — 6%, worse than 89% of copper alloy grades
C28000-H06 properties
Typical room-temperature values for C28000-H06 — 37 properties are specific to this condition; the rest are grade-level values shared by every C28000 temper. Each bar shows where the value sits among the copper alloy grades in FabDigit's library — further right is higher.
Physical3
C28000-H06 has a density of 8.39 g/cm³ (0.303 lb/in³), lighter than 76% of copper alloy grades. It melts at 899°C (1,650 °F).
Mechanical11
C28000-H06 has a yield strength of 450 MPa (65.3 ksi) and a tensile strength of 570 MPa (82.7 ksi) — stronger than 86% of copper alloy grades. Elongation at break is 6% and the elastic modulus is 105 GPa (15.2 Msi).
Thermal6
C28000-H06 is rated for continuous service to 130°C (266 °F). It conducts heat at 123 W/m·K (71.1 BTU/hr·ft·°F), better than 69% of copper alloy grades. Thermal expansion is 20.8 µm/m·K (11.6 µin/in·°F).
Electrical3
C28000-H06 conducts electricity at 28 % IACS, better than 68% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (48/100), worse than 96% of copper alloy grades.
Sustainability4
Producing a kilogram of C28000-H06 takes about 50 MJ of energy and emits 3.1 kg of CO₂ — less than 90% of copper alloy grades. Typical recycled content is 45%.
Manufacturability8
C28000-H06's machinability is good (55/100, better than 72% of copper alloy grades); weldability fair (38/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other C28000 tempers and conditions
C28000 is also supplied in 8 other conditions. The full side-by-side table is on the C28000 overview.
- ODefaultMost-stocked soft condition for sheet/plate that must be bent, spun or deep-formed before service.145 MPa yield · 75 HB
- H06Maximum practical cold-work temper for 60/40 brass — highest strength and hardness with very low ductility, used for flat springs, stiff strip and wear plates.450 MPa yield · 155 HB
- H03Heavily cold-rolled (~30–35% reduction) Muntz metal with high strength and spring-like stiffness, limited to gentle forming operations.380 MPa yield · 135 HB
- H02Standard strength condition for flat sheet, architectural panels and lightly formed parts.359 MPa yield · 130 HB
- H01Choose when moderate stiffness/strength is needed but some bending is still required.275 MPa yield · 105 HB
- H00Lightly cold-worked (~10% reduction) Muntz metal sheet/plate — small strength gain over hot-rolled temper while retaining good bending and forming ability.205 MPa yield · 95 HB
Working with C28000-H06
Is C28000 easy to machine?
Machines to a rating of about 40 % of free-cutting C36000 — expect gummier chips than leaded brass; use sharp positive-rake tools, high speed and light feeds with emulsion coolant.
Can C28000 be welded?
Resistance and braze/solder joining are good; fusion (GTAW/GMAW) is only fair because of zinc fuming and porosity — use low heat input, ventilation and a Cu-Si or Cu-Sn filler.
Can C28000 be formed, bent or molded?
Excellent hot workability at 650–780 °C (hot rolling, extrusion, forging); cold bending is limited in H02/H04 — anneal at 425–600 °C between severe draws.
What surface finishes work on C28000?
Polishes and buffs to a bright yellow finish; stress-relieve (about 250–300 °C) before service and protect with benzotriazole/lacquer or nickel-chrome plating to prevent dezincification and SCC.
C28000 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 |
|---|---|---|
| CuASTM B36 / UNS C28000 | 59 – 63 | 60 |
| Pb | ≤ 0.3 | 0.05 |
| Fe | ≤ 0.07 | 0.03 |
| Znremainder ≈ 37–41 % | balance | — |
C28000-H06 — frequently asked
What is C28000-H06 used for?
C28000-H06 is typically used for architectural cladding and trim panels, heat exchanger and condenser tube sheets, hot-extruded rod and forged fittings, marine hardware and hull sheathing, valve stems and pump components and brazing and filler rod stock. In short: muntz brass forming sheet.
What is the yield strength of C28000-H06?
C28000-H06 has a typical yield strength of 450 MPa (65.3 ksi) and a tensile strength of 570 MPa (82.7 ksi) — stronger than 86% of copper alloy grades. Strength varies by condition: see the 9 listed tempers.
Is C28000-H06 easy to machine?
Reasonably — machinability is rated good (55/100, better than 72% of copper alloy grades). Machines to a rating of about 40 % of free-cutting C36000 — expect gummier chips than leaded brass; use sharp positive-rake tools, high speed and light feeds with emulsion coolant.
Can C28000-H06 be welded?
With care — weldability is rated fair (38/100). Resistance and braze/solder joining are good; fusion (GTAW/GMAW) is only fair because of zinc fuming and porosity — use low heat input, ventilation and a Cu-Si or Cu-Sn filler.
What surface finishes work on C28000-H06?
Polishes and buffs to a bright yellow finish; stress-relieve (about 250–300 °C) before service and protect with benzotriazole/lacquer or nickel-chrome plating to prevent dezincification and SCC.
Can C28000-H06 be formed, bent or molded?
Excellent hot workability at 650–780 °C (hot rolling, extrusion, forging); cold bending is limited in H02/H04 — anneal at 425–600 °C between severe draws.
What is the maximum service temperature of C28000-H06?
C28000-H06 is rated for continuous use to about 130°C (266 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C28000-O and C28000-H06?
O is the default condition — most-stocked soft condition for sheet/plate that must be bent, spun or deep-formed before service. H06: maximum practical cold-work temper for 60/40 brass — highest strength and hardness with very low ductility, used for flat springs, stiff strip and wear plates. Yield strength is 145 MPa in O versus 450 MPa in H06.
Can FabDigit make parts in C28000-H06?
Yes — C28000-H06 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 B36/B36M — Brass Plate, Sheet, Strip and Rolled Bar — ASTM (2018)
- ASTM B171/B171M — Copper-Alloy Plate for Condensers and Heat Exchangers — ASTM (2018)
- CDA Alloy Datasheet C28000 (Muntz Metal) — Copper Development Association (copper.org) (2024)
- ASM Handbook Vol. 2 — Properties of Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- GB/T 2040 / GB/T 4423 — (H62) — SAC (2017)
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.