Copper Alloy C19100-OS050
Temper
UNS C19100
OS050 = annealed to 0.050 mm grain size
Fully soft annealed rod/wire for maximum ductility before heading, upsetting or deep bending.
Values for the OS050 condition
Other C19100 tempers and conditions
C19100 is listed in 8 conditions; see the grade overview at C19100.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
OS050This page Annealed to 0.050 mm grain size | Fully soft annealed rod/wire for maximum ductility before heading, upsetting or deep bending. | 105 | 275 | 40 | 65 HB | 46 % IACS |
As forged and quenched | Softest, most formable supply condition — Ni-P held in solution so the part can be coined/bent and then aged to full strength. | 140 | 310 | 35 | 72 HB | 35 % IACS |
As hot forged and air cooled | Standard delivery state of forgings and extrusions where partial in-process ageing gives a useful strength/conductivity balance without extra heat treatment. | 215 | 350 | 25 | 90 HB | 42 % IACS |
Quarter hard, drawn and stress relieved | Usual screw-machine rod condition: straight, low-residual-stress bar with mid-range strength and clean chip breaking. | 340 | 415 | 16 | 120 HB | 44 % IACS |
Half hard | Cold-drawn bar/wire when higher strength is wanted without an ageing cycle. | 380 | 450 | 12 | 130 HB | 43 % IACS |
TF00Default Solution heat treated and precipitation hardened | Pick for maximum strength plus recovered conductivity and best softening resistance in machined electrical parts. | 400 | 470 | 15 | 140 HB | 45 % IACS |
Full hard | Highest as-drawn strength and stiffness for pins, studs and spring-loaded contact stems; limited bending. | 450 | 500 | 8 | 150 HB | 42 % IACS |
TD04 and precipitation hardened | Maximum available strength: hard drawing followed by ageing, for highly loaded machined electrical hardware. | 500 | 550 | 8 | 165 HB | 44 % IACS |
What is C19100-OS050?
C19100-OS050 is C19100 in the OS050 temper — fully soft annealed rod/wire for maximum ductility before heading, upsetting or deep bending. C19100-OS050 has a yield strength of 105 MPa (15.2 ksi) and a tensile strength of 275 MPa (39.9 ksi) — weaker than 85% of copper alloy grades. Elongation at break is 40% and the elastic modulus is 121 GPa (17.5 Msi). C19100-OS050 has a density of 8.86 g/cm³ (0.32 lb/in³), heavier than 68% of copper alloy grades. It melts at 1,035°C (1,895 °F). TF00 is the default condition FabDigit quotes; OS050 is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 40%, better than 84% of copper alloy grades
- Forms and bends easily — 70/100, better than 80% of copper alloy grades
- Easy to machine — 72/100, better than 79% of copper alloy grades
- High electrical conductivity — 46 % IACS, better than 78% of copper alloy grades
- Conducts heat well — 185 W/m·K (106.9 BTU/hr·ft·°F), better than 76% of copper alloy grades
Limitations
- Low strength — 105 MPa (15.2 ksi), worse than 85% of copper alloy grades
C19100-OS050 properties
Typical room-temperature values for C19100-OS050; 20 are specific to this condition. Other listed values are C19100 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C19100-OS050 has a density of 8.86 g/cm³ (0.32 lb/in³), heavier than 68% of copper alloy grades. It melts at 1,035°C (1,895 °F).
Mechanical13
C19100-OS050 has a yield strength of 105 MPa (15.2 ksi) and a tensile strength of 275 MPa (39.9 ksi) — weaker than 85% of copper alloy grades. Elongation at break is 40% and the elastic modulus is 121 GPa (17.5 Msi).
Thermal6
C19100-OS050 is rated for continuous service to 200°C (392 °F). It conducts heat at 185 W/m·K (106.9 BTU/hr·ft·°F), better than 76% of copper alloy grades. Thermal expansion is 17.6 µm/m·K (9.78 µin/in·°F).
Electrical3
C19100-OS050 conducts electricity at 46 % IACS, better than 78% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 57% of copper alloy grades.
Sustainability4
Producing a kilogram of C19100-OS050 takes about 57 MJ of energy and emits 3.8 kg of CO₂ — less than 52% of copper alloy grades. Typical recycled content is 30%.
Manufacturability7
C19100-OS050's machinability is very good (72/100, better than 79% of copper alloy grades); weldability poor (30/100); formability very good (70/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C19100-OS050
Is C19100 easy to machine?
Excellent free-cutting behaviour (~80 % of free-cutting brass): use sharp positive-rake carbide or HSS tools, high speed, light feeds and soluble-oil coolant; tellurium gives short chips without lead.
Can C19100 be welded?
Fusion welding is generally avoided — tellurium promotes hot cracking; join by silver brazing, soldering or resistance/friction welding, or use mechanical fastening.
Can C19100 be formed, bent or molded?
Hot forge/extrude at about 750–875 °C then air cool (M10) or quench (M11); cold bending and heading are best done in the quenched or annealed state, followed by 425–500 °C ageing for strength.
What surface finishes work on C19100?
Not anodisable; readily electroplated with Ni, Ag or Sn after cyanide-free acid activation, and takes a bright mechanical polish. Tellurium-bearing turnings should be segregated for recycling.
C19100 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 |
|---|---|---|
| Niwith Co counted as Ni in some registrations | 0.6 – 1.2 | 0.9 |
| Tefree-machining chip breaker | 0.35 – 0.7 | 0.5 |
| Pforms Ni-P precipitates | 0.15 – 0.35 | 0.25 |
| Pb | ≤ 0.2 | — |
| Zn | ≤ 0.5 | — |
| Fe | ≤ 0.1 | — |
| Cu98.4 % min including Ni, Te, P per CDA registration | balance | — |
C19100-OS050 — frequently asked
What is C19100-OS050 used for?
C19100-OS050 is typically used for precision machined electrical parts, connectors and switch components. In short: free-cutting conductive copper; 300 °C service temperature; age-hardenable machining grade.
What is the yield strength of C19100-OS050?
C19100-OS050 has a typical yield strength of 105 MPa (15.2 ksi) and a tensile strength of 275 MPa (39.9 ksi) — weaker than 85% of copper alloy grades. Strength varies by condition: see the 8 listed tempers.
Is C19100-OS050 easy to machine?
Yes — machinability is rated very good (72/100, better than 79% of copper alloy grades). Excellent free-cutting behaviour (~80 % of free-cutting brass): use sharp positive-rake carbide or HSS tools, high speed, light feeds and soluble-oil coolant; tellurium gives short chips without lead.
Can C19100-OS050 be welded?
Not readily — weldability is rated poor (30/100). Fusion welding is generally avoided — tellurium promotes hot cracking; join by silver brazing, soldering or resistance/friction welding, or use mechanical fastening.
What surface finishes work on C19100-OS050?
Not anodisable; readily electroplated with Ni, Ag or Sn after cyanide-free acid activation, and takes a bright mechanical polish. Tellurium-bearing turnings should be segregated for recycling.
Can C19100-OS050 be formed, bent or molded?
Hot forge/extrude at about 750–875 °C then air cool (M10) or quench (M11); cold bending and heading are best done in the quenched or annealed state, followed by 425–500 °C ageing for strength.
What is the maximum service temperature of C19100-OS050?
C19100-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 C19100-TF00 and C19100-OS050?
TF00 is the default condition — pick for maximum strength plus recovered conductivity and best softening resistance in machined electrical parts. OS050: fully soft annealed rod/wire for maximum ductility before heading, upsetting or deep bending. Yield strength is 400 MPa in TF00 versus 105 MPa in OS050.
Sources
- Copper Alloy C19100 datasheet (composition, properties, temper table) — Copper Development Association (2024)
- ASTM B301 / B441 — Free-Cutting and Tellurium/Nickel-Bearing Copper Rod and Bar — ASTM International (2020)
- 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.