Copper Alloy C27200-H03
Supply condition
UNS C27200
H03 = three-quarter hard
Intermediate temper when H02 is too soft and H04 too brittle for the bend radius.
Values for the H03 condition
Other C27200 tempers and conditions
C27200 is listed in 10 conditions; see the grade overview at C27200.
Compare all 10 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed to 0.050 mm grain size | Coarser-grain anneal for the deepest draws where slight orange peel is acceptable. | 97 | 317 | 62 | 55 HB | 27 % IACS |
OS025Default Annealed to 0.025 mm grain size | Softest commercial condition — pick for deep drawing, spinning and severe forming. | 110 | 330 | 55 | 60 HB | 27 % IACS |
As hot rolled | Economical as-hot-worked rod, plate and shapes for parts that will be machined or annealed later. | 125 | 340 | 50 | 65 HB | 27 % IACS |
Quarter hard | Light temper for parts needing moderate bending plus a little more stiffness than annealed. | 275 | 385 | 43 | 75 HB | — |
Half hard | Most common strip temper for stamped hardware needing 90° bends and useful strength. | 345 | 427 | 23 | 110 HB | — |
Hard drawn | Cold-drawn round product temper — pick for straight, strong rod, wire and tube stock for machining or bending. | 345 | 470 | 15 | 130 HB | — |
H03This page Three-quarter hard | Intermediate temper when H02 is too soft and H04 too brittle for the bend radius. | 380 | 470 | 15 | 130 HB | 26 % IACS |
Full hard | Standard high-strength strip/sheet temper for flat springs, contacts and stiff stampings. | 414 | 510 | 8 | 145 HB | — |
Extra hard | Choose for maximum flat-strip strength where only gentle forming across grain is required. | 448 | 570 | 5 | 165 HB | — |
Spring hard | Spring temper strip/wire for clips and contacts; very limited bendability, prone to SCC if not stress relieved. | 500 | 620 | 4 | 180 HB | 26 % IACS |
What is C27200-H03?
C27200-H03 is C27200 supplied in the H03 condition — intermediate temper when H02 is too soft and H04 too brittle for the bend radius. C27200-H03 has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 77% of copper alloy grades. Elongation at break is 15% and the elastic modulus is 103 GPa (14.9 Msi). C27200-H03 has a density of 8.47 g/cm³ (0.306 lb/in³), lighter than 68% of copper alloy grades. It melts at 905°C (1,661 °F). OS025 is the default condition FabDigit quotes; H03 is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 85/100, better than 92% of copper alloy grades
- High strength — 380 MPa (55.1 ksi), better than 77% of copper alloy grades
Limitations
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
- Needs corrosion protection — 50/100, worse than 95% of copper alloy grades
- High embodied carbon — 4.5 kg CO₂/kg, worse than 79% of copper alloy grades
C27200-H03 properties
Typical room-temperature values for C27200-H03; 20 are specific to this condition. Other listed values are C27200 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C27200-H03 has a density of 8.47 g/cm³ (0.306 lb/in³), lighter than 68% of copper alloy grades. It melts at 905°C (1,661 °F).
Mechanical13
C27200-H03 has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 77% of copper alloy grades. Elongation at break is 15% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
C27200-H03 is rated for continuous service to 150°C (302 °F). It conducts heat at 121 W/m·K (69.9 BTU/hr·ft·°F), better than 68% of copper alloy grades. Thermal expansion is 20.3 µm/m·K (11.3 µin/in·°F).
Electrical3
C27200-H03 conducts electricity at 26 % IACS, better than 63% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (50/100), worse than 95% of copper alloy grades.
Sustainability4
Producing a kilogram of C27200-H03 takes about 65 MJ of energy and emits 4.5 kg of CO₂ — more than 81% of copper alloy grades. Typical recycled content is 45%.
Manufacturability8
C27200-H03's machinability is fair (40/100, better than 57% of copper alloy grades); weldability fair (42/100); formability fair (50/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C27200-H03
Is C27200 easy to machine?
Machinable but gummy compared with leaded C36000 (≈30 % of AISI 1212) — use sharp positive-rake tools, high speed, light feeds and good lubrication; prefer H02/H04 tempers for cleaner chips.
Can C27200 be welded?
Best joined by soldering or brazing; GTAW/oxyfuel possible with silicon-bronze filler but zinc volatilization causes porosity and fume — provide extraction and avoid resistance welding.
Can C27200 be formed, bent or molded?
Excellent cold formability in OS025/OS050 for deep drawing, spinning and stamping; interanneal at 425–600 °C and stress-relieve cold-worked parts at 260–300 °C to prevent season cracking.
What surface finishes work on C27200?
Buffs to a bright gold lustre; readily nickel/chrome/gold plated, chemically antiqued or lacquered — anodizing is not applicable to copper alloys.
C27200 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 |
|---|---|---|
| Cuincludes silver | 62 – 65 | 63 |
| Pb | ≤ 0.07 | — |
| Fe | ≤ 0.07 | — |
| Zn | balance | — |
C27200-H03 — frequently asked
What is C27200-H03 used for?
C27200-H03 is typically used for hardware, decorative trim, stampings and wire products. In short: low-cost decorative brass; excellent deep-drawing formability; gummy compared with C36000.
What is the yield strength of C27200-H03?
C27200-H03 has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 77% of copper alloy grades. Strength varies by condition: see the 10 listed tempers.
Is C27200-H03 easy to machine?
Not especially — machinability is rated fair (40/100, better than 57% of copper alloy grades). Machinable but gummy compared with leaded C36000 (≈30 % of AISI 1212) — use sharp positive-rake tools, high speed, light feeds and good lubrication; prefer H02/H04 tempers for cleaner chips.
Can C27200-H03 be welded?
With care — weldability is rated fair (42/100). Best joined by soldering or brazing; GTAW/oxyfuel possible with silicon-bronze filler but zinc volatilization causes porosity and fume — provide extraction and avoid resistance welding.
What surface finishes work on C27200-H03?
Buffs to a bright gold lustre; readily nickel/chrome/gold plated, chemically antiqued or lacquered — anodizing is not applicable to copper alloys.
Can C27200-H03 be formed, bent or molded?
Excellent cold formability in OS025/OS050 for deep drawing, spinning and stamping; interanneal at 425–600 °C and stress-relieve cold-worked parts at 260–300 °C to prevent season cracking.
What is the maximum service temperature of C27200-H03?
C27200-H03 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 C27200-OS025 and C27200-H08?
OS025 is the default condition — softest commercial condition — pick for deep drawing, spinning and severe forming. H08: spring temper strip/wire for clips and contacts; very limited bendability, prone to SCC if not stress relieved. Yield strength is 110 MPa in OS025 versus 500 MPa in H08.
Sources
- ASTM B36/B36M Brass Plate, Sheet, Strip and Rolled Bar — ASTM International (2018)
- ASTM B134/B134M Brass Wire — ASTM International (2015)
- CDA Copper Alloy Datasheet C27200 — Copper Development Association (2023)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
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.