Copper Alloy C68300-OS015
Temper
UNS C68300
OS015 = annealed to 0.015 mm grain size
Very fine grain soft temper where orange-peel must be avoided on visible formed surfaces.
Values for the OS015 condition
Other C68300 tempers and conditions
C68300 is listed in 11 conditions; see the grade overview at C68300.
Compare all 11 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed to 0.050 mm grain size | Coarse-grain soft anneal for maximum drawability in severe forming of cups and fittings. | 95 | 320 | 60 | 53 HB | 30 % IACS |
O61Default Annealed | Standard stocked soft condition for tube bending, expanding into tubesheets and deep drawing. | 105 | 330 | 55 | 58 HB | 30 % IACS |
Annealed to 0.025 mm grain size | Fine-grain soft anneal giving smoother surfaces after forming and slightly higher strength. | 120 | 345 | 52 | 63 HB | 30 % IACS |
OS015This page Annealed to 0.015 mm grain size | Very fine grain soft temper where orange-peel must be avoided on visible formed surfaces. | 140 | 360 | 48 | 70 HB | 30 % IACS |
Light drawn tube | Light draw for straight condenser/heat-exchanger tube that still needs to be expanded into tubesheets. | 215 | 370 | 35 | 80 HB | 29 % IACS |
Quarter hard | Light cold work for flat products needing stiffness while retaining good bending. | 240 | 380 | 38 | 85 HB | 30 % IACS |
Drawn and stress-relieved tube | Cold-drawn then low-temperature stress relieved to minimise residual-stress SCC risk in ammonia-bearing service. | 250 | 385 | 30 | 88 HB | 30 % IACS |
Drawn, general purpose tube | General-purpose drawn tube temper for plumbing and pressure lines with moderate bending. | 260 | 395 | 28 | 90 HB | 29 % IACS |
Half hard | Balanced strength/formability temper for stamped fittings and formed components. | 320 | 425 | 23 | 110 HB | 29.5 % IACS |
Hard drawn | Hard-drawn tube for maximum pressure rating and straightness where no further forming is required. | 380 | 460 | 10 | 130 HB | 29 % IACS |
Full hard | Fully hard temper for springy flat parts and maximum strength with minimal forming. | 410 | 490 | 8 | 140 HB | 29 % IACS |
What is C68300-OS015?
C68300-OS015 is C68300 in the OS015 temper — very fine grain soft temper where orange-peel must be avoided on visible formed surfaces. C68300-OS015 has a yield strength of 140 MPa (20.3 ksi) and a tensile strength of 360 MPa (52.2 ksi) — weaker than 74% of copper alloy grades. Elongation at break is 48% and the elastic modulus is 110 GPa (16 Msi). C68300-OS015 has a density of 8.53 g/cm³ (0.308 lb/in³), lighter than 62% of copper alloy grades. It melts at 927°C (1,701 °F). O61 is the default condition FabDigit quotes; OS015 is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 48%, better than 97% of copper alloy grades
- Forms and bends easily — 88/100, better than 87% of copper alloy grades
C68300-OS015 properties
Typical room-temperature values for C68300-OS015; 20 are specific to this condition. Other listed values are C68300 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C68300-OS015 has a density of 8.53 g/cm³ (0.308 lb/in³), lighter than 62% of copper alloy grades. It melts at 927°C (1,701 °F).
Mechanical13
C68300-OS015 has a yield strength of 140 MPa (20.3 ksi) and a tensile strength of 360 MPa (52.2 ksi) — weaker than 74% of copper alloy grades. Elongation at break is 48% and the elastic modulus is 110 GPa (16 Msi).
Thermal6
C68300-OS015 is rated for continuous service to 200°C (392 °F). It conducts heat at 133 W/m·K (76.8 BTU/hr·ft·°F), better than 71% of copper alloy grades. Thermal expansion is 20 µm/m·K (11.1 µin/in·°F).
Electrical3
C68300-OS015 conducts electricity at 30 % IACS, better than 71% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (66/100), better than 64% of copper alloy grades.
Sustainability4
Producing a kilogram of C68300-OS015 takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 40%.
Manufacturability8
C68300-OS015's machinability is poor (32/100, worse than 57% of copper alloy grades); weldability good (55/100); formability excellent (88/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C68300-OS015
Is C68300 easy to machine?
Unleaded α-brass: gummy, long chips — use sharp positive-rake tools, high speed, light feeds; rating ≈30 % of free-cutting brass.
Can C68300 be welded?
Excellent for soldering and silver brazing; GTAW possible with Cu-Si or Cu-Sn filler but zinc fuming and porosity require ventilation and low heat input.
Can C68300 be formed, bent or molded?
Very good cold formability in O61/OS tempers — deep draws, tube bending and tubesheet expansion; anneal 425–600 °C between heavy operations and stress-relieve at ~275 °C to avoid SCC.
What surface finishes work on C68300?
Polishes to a bright finish; accepts tin, nickel and chrome plating; use clear lacquer or chemical patina outdoors — anodizing not applicable.
C68300 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 |
|---|---|---|
| Cuincluding trace Ag | 75 – 77.5 | 76 |
| Sbdezincification inhibitor | 0.02 – 0.1 | 0.05 |
| Siinhibitor / deoxidiser | 0.02 – 0.1 | 0.05 |
| Pb | ≤ 0.05 | — |
| Fe | ≤ 0.06 | — |
| Zn | balance | — |
C68300-OS015 — frequently asked
What is C68300-OS015 used for?
C68300-OS015 is typically used for condenser tubes, plumbing tube and marine tubing. In short: dezincification-resistant tube brass; formability rating 95; unleaded plumbing brass.
What is the yield strength of C68300-OS015?
C68300-OS015 has a typical yield strength of 140 MPa (20.3 ksi) and a tensile strength of 360 MPa (52.2 ksi) — weaker than 74% of copper alloy grades. Strength varies by condition: see the 11 listed tempers.
Is C68300-OS015 easy to machine?
Not especially — machinability is rated poor (32/100, worse than 57% of copper alloy grades). Unleaded α-brass: gummy, long chips — use sharp positive-rake tools, high speed, light feeds; rating ≈30 % of free-cutting brass.
Can C68300-OS015 be welded?
Yes — weldability is rated good (55/100). Excellent for soldering and silver brazing; GTAW possible with Cu-Si or Cu-Sn filler but zinc fuming and porosity require ventilation and low heat input.
What surface finishes work on C68300-OS015?
Polishes to a bright finish; accepts tin, nickel and chrome plating; use clear lacquer or chemical patina outdoors — anodizing not applicable.
Can C68300-OS015 be formed, bent or molded?
Very good cold formability in O61/OS tempers — deep draws, tube bending and tubesheet expansion; anneal 425–600 °C between heavy operations and stress-relieve at ~275 °C to avoid SCC.
What is the maximum service temperature of C68300-OS015?
C68300-OS015 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 C68300-O61 and C68300-H04?
O61 is the default condition — standard stocked soft condition for tube bending, expanding into tubesheets and deep drawing. H04: fully hard temper for springy flat parts and maximum strength with minimal forming. Yield strength is 105 MPa in O61 versus 410 MPa in H04.
Sources
- CDA Standard Designation & Alloy Data (C6xxxx wrought brasses) — Copper Development Association (2023)
- ASTM B135 / B111 — Seamless Brass and Copper-Alloy Condenser Tube — ASTM International (2022)
- 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.