Copper Alloy C19010
UNS C19010 · EN CW109C, CuNi2Si
C19010 (CW109C, CuNi2Si) is a precipitation-hardening copper-nickel-silicon alloy in the C10000–C19999 wrought family, offered annealed, cold-rolled H01–H10 and mill-hardened TM02–TM08.
Reference datasheet — C19010 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the TM04 condition
C19010 tempers and conditions
C19010 is supplied in 13 conditions, soft to hard. TM04 is the default FabDigit quotes; the values on this page are for it.
Compare all 13 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Choose for deep-drawn or severely formed parts that will be precipitation aged by the user after forming. | 130 | 310 | 35 | 40 HRB | 45 % IACS |
Quarter hard | Lowest cold-rolled temper: pick when tight bends and forming dominate over spring force. | 340 | 400 | 13 | 62 HRB | 58 % IACS |
Half hard | Balanced strength/formability cold-rolled temper for stamped terminals with moderate bends. | 400 | 440 | 9 | 70 HRB | 57 % IACS |
Mill hardened, half hard | Mill-hardened level for parts needing good bend formability plus better stress relaxation than plain cold work. | 400 | 450 | 13 | 68 HRB | 61 % IACS |
Three-quarter hard | Use when H02 lacks contact force but full-hard bend performance is still needed. | 435 | 470 | 7 | 74 HRB | 56 % IACS |
Mill hardened, intermediate strength | Pick for stamped connector contacts needing 90° bends in both directions with H03-class strength. | 445 | 490 | 11 | 73 HRB | 60 % IACS |
Full hard | Standard hard cold-rolled strip for flat stamped conductors and lead frames with simple bends. | 470 | 500 | 5 | 78 HRB | 55 % IACS |
TM04Default Mill hardened, full hard | The workhorse condition: age hardened at the mill for full-hard-class strength with usable formability and 55–65 % IACS. | 480 | 520 | 8 | 77 HRB | 60 % IACS |
Extra hard | Higher cold-work level for straight stamped springs where bending is minimal. | 515 | 540 | 3.5 | 82 HRB | 55 % IACS |
Mill hardened, extra hard | Higher mill-hardened level for higher contact normal force and better relaxation resistance at 150–200 °C. | 535 | 570 | 6 | 82 HRB | 58 % IACS |
Spring hard | Spring temper strip for high contact-force clips accepting limited bend formability. | 550 | 570 | 2.5 | 85 HRB | 54 % IACS |
Extra spring hard | Maximum cold-rolled strength for flat springs with essentially no forming after rolling. | 580 | 600 | 2 | 88 HRB | 54 % IACS |
Mill hardened, spring hard | Top mill-hardened level: strongest spring performance of C19010 while keeping >55 % IACS. | 580 | 610 | 4 | 86 HRB | 57 % IACS |
What is C19010?
C19010 (CW109C, CuNi2Si) is a precipitation-hardening copper-nickel-silicon alloy in the C10000–C19999 wrought family, offered annealed, cold-rolled H01–H10 and mill-hardened TM02–TM08. It combines 480 MPa yield, 520 MPa tensile, 8% elongation and 77 HRB with 60% IACS and 230 W/m·K, so connectors and lead frames hold contact force without excessive Joule heating. Service is limited to about 200 °C before over-aging, elongation is only 8%, and fusion welding softens the heat-affected zone; C19000 is the lower-strength alternative. C19010 has a density of 8.86 g/cm³ (0.32 lb/in³), heavier than 68% of copper alloy grades. It melts at 1,075°C (1,967 °F). C19010 has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 520 MPa (75.4 ksi) — stronger than 88% of copper alloy grades. Elongation at break is 8% and the elastic modulus is 131 GPa (19 Msi).
What is C19010 used for?
- electrical/electronic connectors
- lead frames
- high-strength contacts
Advantages
- Stiff — 131 GPa (19 Msi), better than 91% of copper alloy grades
- High strength — 480 MPa (69.6 ksi), better than 88% of copper alloy grades
- Conducts heat well — 230 W/m·K (132.9 BTU/hr·ft·°F), better than 81% of copper alloy grades
- High electrical conductivity — 60 % IACS, better than 81% of copper alloy grades
Limitations
- Limited ductility — 8%, worse than 83% of copper alloy grades
C19010 properties
Typical room-temperature values for C19010-TM04; bars are the position among copper alloy grades.
Physical3
C19010 has a density of 8.86 g/cm³ (0.32 lb/in³), heavier than 68% of copper alloy grades. It melts at 1,075°C (1,967 °F).
Mechanical11
C19010 has a yield strength of 480 MPa (69.6 ksi) and a tensile strength of 520 MPa (75.4 ksi) — stronger than 88% of copper alloy grades. Elongation at break is 8% and the elastic modulus is 131 GPa (19 Msi).
Thermal6
C19010 is rated for continuous service to 200°C (392 °F). It conducts heat at 230 W/m·K (132.9 BTU/hr·ft·°F), better than 81% of copper alloy grades. Thermal expansion is 17.6 µm/m·K (9.78 µin/in·°F).
Electrical3
C19010 conducts electricity at 60 % IACS, better than 81% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 86% of copper alloy grades.
Sustainability4
Producing a kilogram of C19010 takes about 57 MJ of energy and emits 3.6 kg of CO₂ — less than 52% of copper alloy grades. Typical recycled content is 30%.
Manufacturability7
C19010's machinability is fair (40/100, better than 57% of copper alloy grades); weldability fair (45/100); formability good (60/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the copper alloy family
Yield strength against density for every copper alloy grade FabDigit runs. C19010 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C19010
Is C19010 easy to machine?
Machines like a tough, gummy copper alloy — sharp positive-rake carbide, high speed, generous coolant; expect burrs and plan for deburring on stamped edges.
Can C19010 be welded?
Resistance, laser and ultrasonic joining are routine; fusion arc welding locally dissolves the Ni-Si precipitates and softens the HAZ, so avoid it on spring sections.
Can C19010 be formed, bent or molded?
Stamp and form in mill-hardened tempers (TM03–TM06) for the best bend-versus-strength trade-off; align tight bends good-way when possible and allow more springback than for brass.
C19010 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 |
|---|---|---|
| Niprimary precipitate former with Si | 0.8 – 1.8 | 1.1 |
| Si | 0.15 – 0.35 | 0.22 |
| P | 0.01 – 0.04 | 0.03 |
| Pbimpurity limit | ≤ 0.02 | |
| CuCu + named elements 99.8 % min; Cu 98.7 % min | balance |
What surface finishes work on C19010?
Not anodizable; standard finishes are matte/bright tin, nickel underplate plus gold or silver for contacts — solderability is excellent, and bare surfaces tarnish so store dry.
Surface treatments FabDigit runs on copper alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Equivalent designations
Standards and trade names that resolve to Copper Alloy C19010 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- CW109CCuNi2Si
How much does C19010 cost?
C19010 is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
C19010 — frequently asked
What is C19010 used for?
C19010 is typically used for electrical/electronic connectors, lead frames and high-strength contacts. In short: 60% IACS spring copper; mill-hardened connector strip; beryllium-free contact alloy.
What is the yield strength of C19010?
C19010 has a typical yield strength of 480 MPa (69.6 ksi) and a tensile strength of 520 MPa (75.4 ksi) — stronger than 88% of copper alloy grades. Strength varies by condition: see the 13 listed tempers.
Is C19010 easy to machine?
Not especially — machinability is rated fair (40/100, better than 57% of copper alloy grades). Machines like a tough, gummy copper alloy — sharp positive-rake carbide, high speed, generous coolant; expect burrs and plan for deburring on stamped edges.
Can C19010 be welded?
With care — weldability is rated fair (45/100). Resistance, laser and ultrasonic joining are routine; fusion arc welding locally dissolves the Ni-Si precipitates and softens the HAZ, so avoid it on spring sections.
What surface finishes work on C19010?
Not anodizable; standard finishes are matte/bright tin, nickel underplate plus gold or silver for contacts — solderability is excellent, and bare surfaces tarnish so store dry.
Can C19010 be formed, bent or molded?
Stamp and form in mill-hardened tempers (TM03–TM06) for the best bend-versus-strength trade-off; align tight bends good-way when possible and allow more springback than for brass.
What is the maximum service temperature of C19010?
C19010 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 C19010-TM04 and C19010-O60?
TM04 is the default condition — the workhorse condition: age hardened at the mill for full-hard-class strength with usable formability and 55–65 % IACS. O60: choose for deep-drawn or severely formed parts that will be precipitation aged by the user after forming. Yield strength is 480 MPa in TM04 versus 130 MPa in O60.
How much does C19010 cost?
C19010 is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ASTM B747/B747M — Copper Alloy Strip for Use in Manufacture of Electrical Connectors or Spring Contacts — ASTM International (2021)
- ASTM B888/B888M — Copper Alloy Strip for Automotive Electrical Connectors — ASTM International (2020)
- CDA/UNS alloy registration data for C19010 — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- High-performance Cu-Ni-Si connector strip datasheets (Wieland / Materion / KME class products) — various producers (2023)
- EN 1654 / CW109C (CuNi2Si) strip for springs and connectors — CEN (2019)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.