Copper Alloy C44300-OS050
Temper
UNS C44300 · ASTM B111 · EN CuZn28Sn1As, CW706R · JIS C4430 · GB HSn70-1AS
OS050 = annealed to 0.050 mm grain size
Coarser-grain annealed sheet/plate for deep drawing and severe cold forming of tubesheet or shell parts.
Values for the OS050 condition
Other C44300 tempers and conditions
C44300 is listed in 9 conditions; see the grade overview at C44300.
Compare all 9 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 annealed sheet/plate for deep drawing and severe cold forming of tubesheet or shell parts. | 117 | 331 | 65 | 68 HB | 25 % IACS |
O61Default Annealed | Standard condenser/heat-exchanger tube condition — maximum ductility for expanding into tubesheets and U-bending. | 125 | 340 | 65 | 70 HB | 25 % IACS |
Annealed to 0.025 mm grain size | Fine-grain annealed strip/plate for shallow forming and best surface after finishing. | 140 | 350 | 60 | 75 HB | 25 % IACS |
Light drawn tube | Light draw for straighter, stiffer tube that still expands into tubesheets; common alternative to O61. | 205 | 385 | 50 | 90 HB | 25 % IACS |
Light drawn and stress relieved tube | Choose when residual stress must be lowered to avoid ammonia/steam-side stress-corrosion cracking in drawn tube. | 215 | 390 | 48 | 92 HB | 25 % IACS |
Drawn, general purpose tube | General-purpose drawn tube where moderate strength and good straightness matter more than expandability. | 230 | 400 | 45 | 100 HB | 25 % IACS |
Quarter hard | Quarter-hard strip/sheet balancing stiffness with residual bending and forming ability. | 275 | 400 | 40 | 100 HB | 25 % IACS |
Half hard | Half-hard sheet/strip for baffles, spacers and lightly formed corrosion-resistant parts. | 345 | 450 | 30 | 120 HB | 25 % IACS |
Hard drawn | Maximum strength drawn tube for pressure-carrying or structural service; not for tube expanding or tight bends. | 350 | 480 | 25 | 130 HB | 24 % IACS |
What is C44300-OS050?
C44300-OS050 is C44300 in the OS050 temper — coarser-grain annealed sheet/plate for deep drawing and severe cold forming of tubesheet or shell parts. C44300-OS050 has a yield strength of 117 MPa (17 ksi) and a tensile strength of 331 MPa (48 ksi) — weaker than 80% of copper alloy grades. Elongation at break is 65% and the elastic modulus is 110 GPa (16 Msi). C44300-OS050 has a density of 8.53 g/cm³ (0.308 lb/in³), lighter than 62% of copper alloy grades. It melts at 900°C (1,652 °F). O61 is the default condition FabDigit quotes; OS050 is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 65%, better than 100% of copper alloy grades
- Forms and bends easily — 92/100, better than 91% of copper alloy grades
Limitations
- Low strength — 117 MPa (17 ksi), worse than 80% of copper alloy grades
C44300-OS050 properties
Typical room-temperature values for C44300-OS050; 21 are specific to this condition. Other listed values are C44300 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C44300-OS050 has a density of 8.53 g/cm³ (0.308 lb/in³), lighter than 62% of copper alloy grades. It melts at 900°C (1,652 °F).
Mechanical13
C44300-OS050 has a yield strength of 117 MPa (17 ksi) and a tensile strength of 331 MPa (48 ksi) — weaker than 80% of copper alloy grades. Elongation at break is 65% and the elastic modulus is 110 GPa (16 Msi).
Thermal6
C44300-OS050 is rated for continuous service to 200°C (392 °F). It conducts heat at 111 W/m·K (64.1 BTU/hr·ft·°F), better than 59% of copper alloy grades. Thermal expansion is 20.2 µm/m·K (11.2 µin/in·°F).
Electrical3
C44300-OS050 conducts electricity at 25 % IACS, better than 59% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (71/100), better than 80% of copper alloy grades.
Sustainability4
Producing a kilogram of C44300-OS050 takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 35%.
Manufacturability8
C44300-OS050's machinability is poor (28/100, worse than 78% of copper alloy grades); weldability fair (45/100); formability excellent (92/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C44300-OS050
Is C44300 easy to machine?
Machinability ~30% of free-cutting brass — gummy, low-lead chips; use sharp positive-rake tools, high speed, generous coolant.
Can C44300 be welded?
Fair weldability: prefer brazing or soldering; if welded use GTAW with Cu-Si/Cu-Sn filler, low heat input, and extract zinc fume.
Can C44300 be formed, bent or molded?
Excellent cold formability in O61/OS tempers (expanding, U-bending, drawing); stress relieve drawn tube at 250–300 °C to avoid ammonia SCC.
What surface finishes work on C44300?
Solders and brazes readily; not anodizable — protect with benzotriazole inhibitor, tin/nickel plating, or clear lacquer; polishes to bright yellow finish.
C44300 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 | 70 – 73 | 71.5 |
| Sn | 0.9 – 1.2 | 1.05 |
| Asdezincification inhibitor | 0.02 – 0.06 | 0.04 |
| Pb | ≤ 0.07 | — |
| Fe | ≤ 0.06 | — |
| Znremainder, nominally ~28% | balance | — |
C44300-OS050 — frequently asked
What is C44300-OS050 used for?
C44300-OS050 is typically used for condenser and heat exchanger tubes, feedwater heater tubes and marine tubing. In short: classic condenser tube brass; arsenic-inhibited dezincification resistance; highest formability tin-brass.
What is the yield strength of C44300-OS050?
C44300-OS050 has a typical yield strength of 117 MPa (17 ksi) and a tensile strength of 331 MPa (48 ksi) — weaker than 80% of copper alloy grades. Strength varies by condition: see the 9 listed tempers.
Is C44300-OS050 easy to machine?
Not especially — machinability is rated poor (28/100, worse than 78% of copper alloy grades). Machinability ~30% of free-cutting brass — gummy, low-lead chips; use sharp positive-rake tools, high speed, generous coolant.
Can C44300-OS050 be welded?
With care — weldability is rated fair (45/100). Fair weldability: prefer brazing or soldering; if welded use GTAW with Cu-Si/Cu-Sn filler, low heat input, and extract zinc fume.
What surface finishes work on C44300-OS050?
Solders and brazes readily; not anodizable — protect with benzotriazole inhibitor, tin/nickel plating, or clear lacquer; polishes to bright yellow finish.
Can C44300-OS050 be formed, bent or molded?
Excellent cold formability in O61/OS tempers (expanding, U-bending, drawing); stress relieve drawn tube at 250–300 °C to avoid ammonia SCC.
What is the maximum service temperature of C44300-OS050?
C44300-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 C44300-O61 and C44300-H80?
O61 is the default condition — standard condenser/heat-exchanger tube condition — maximum ductility for expanding into tubesheets and U-bending. H80: maximum strength drawn tube for pressure-carrying or structural service; not for tube expanding or tight bends. Yield strength is 125 MPa in O61 versus 350 MPa in H80.
Sources
- ASTM B111/B111M — Copper and Copper-Alloy Seamless Condenser Tubes and Ferrule Stock — ASTM (2021)
- ASTM B171 — Copper-Alloy Plate and Sheet for Pressure Vessels, Condensers and Heat Exchangers — ASTM (2018)
- CDA Alloy Datasheet C44300 (Admiralty Brass, Arsenical) — Copper Development Association (2023)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- EN 12451 / CW706R — Seamless round tubes for heat exchangers — CEN (2012)
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.