Copper Alloy C27200-OS050
Temper
UNS C27200
OS050 = annealed to 0.050 mm grain size
Coarser-grain anneal for the deepest draws where slight orange peel is acceptable.
Values for the OS050 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 |
|---|---|---|---|---|---|---|
OS050This page 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 | — |
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-OS050?
C27200-OS050 is C27200 in the OS050 temper — coarser-grain anneal for the deepest draws where slight orange peel is acceptable. C27200-OS050 has a yield strength of 97 MPa (14.1 ksi) and a tensile strength of 317 MPa (46 ksi) — weaker than 87% of copper alloy grades. Elongation at break is 62% and the elastic modulus is 103 GPa (14.9 Msi). C27200-OS050 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; OS050 is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 62%, better than 99% of copper alloy grades
- Forms and bends easily — 97/100, better than 97% of copper alloy grades
- Polishes to a fine finish — 85/100, better than 92% of copper alloy grades
Limitations
- Low strength — 97 MPa (14.1 ksi), worse than 87% of copper alloy grades
- High embodied carbon — 4.5 kg CO₂/kg, worse than 79% of copper alloy grades
C27200-OS050 properties
Typical room-temperature values for C27200-OS050; 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-OS050 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-OS050 has a yield strength of 97 MPa (14.1 ksi) and a tensile strength of 317 MPa (46 ksi) — weaker than 87% of copper alloy grades. Elongation at break is 62% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
C27200-OS050 is rated for continuous service to 200°C (392 °F). It conducts heat at 123 W/m·K (71.1 BTU/hr·ft·°F), better than 70% of copper alloy grades. Thermal expansion is 20.3 µm/m·K (11.3 µin/in·°F).
Electrical3
C27200-OS050 conducts electricity at 27 % IACS, better than 67% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (57/100), worse than 80% of copper alloy grades.
Sustainability4
Producing a kilogram of C27200-OS050 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-OS050's machinability is poor (30/100, worse than 67% of copper alloy grades); weldability fair (45/100); formability excellent (97/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C27200-OS050
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-OS050 — frequently asked
What is C27200-OS050 used for?
C27200-OS050 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-OS050?
C27200-OS050 has a typical yield strength of 97 MPa (14.1 ksi) and a tensile strength of 317 MPa (46 ksi) — weaker than 87% of copper alloy grades. Strength varies by condition: see the 10 listed tempers.
Is C27200-OS050 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 67% 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-OS050 be welded?
With care — weldability is rated fair (45/100). 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-OS050?
Buffs to a bright gold lustre; readily nickel/chrome/gold plated, chemically antiqued or lacquered — anodizing is not applicable to copper alloys.
Can C27200-OS050 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-OS050?
C27200-OS050 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 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.