Copper Alloy C19025
UNS C19025
C19025 is a nickel-tin lightly alloyed copper strip grade, optionally supplied with a thin surface coating or treatment, developed for connectors that need higher strength than pure copper at moderate conductivity.
Reference datasheet — C19025 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 HR04 condition
C19025 tempers and conditions
C19025 is supplied in 7 conditions, soft to hard. HR04 is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Pick for deep-drawn or severely formed parts where strength is added later by the customer's own work hardening. | 180 | 380 | 25 | 105 HB | 48 % IACS |
Half hard | Cold-rolled half hard strip for forming-dominated parts that do not need the extra relaxation resistance of a stress-relief bake. | 430 | 500 | 10 | 148 HB | 43 % IACS |
Half hard and stress relieved | Choose when tight bends (small bend radii, complex terminal geometry) matter more than peak spring force. | 480 | 520 | 9 | 83 HRB | 46 % IACS |
Full hard | Straight cold-rolled hard strip; cheaper than the HR grades but with lower stress-relaxation resistance. | 510 | 565 | 6 | 166 HB | 42 % IACS |
HR04Default Full hard and stress relieved | The workhorse connector-strip temper: balanced spring force, bendability and stress-relaxation resistance. | 550 | 585 | 6 | 88 HRB | 45 % IACS |
Extra hard and stress relieved | Highest-strength stocked temper for miniature high-force contacts; bend radii must be generous and grain direction respected. | 610 | 635 | 4 | 92 HRB | 44 % IACS |
Spring hard and stress relieved | Special-order spring temper for flat contact springs where formability is minimal but contact force must be maximal. | 655 | 680 | 3 | 14 HRC | 43 % IACS |
What is C19025?
C19025 is a nickel-tin lightly alloyed copper strip grade, optionally supplied with a thin surface coating or treatment, developed for connectors that need higher strength than pure copper at moderate conductivity. The default condition gives 550 MPa yield, 585 MPa tensile and 88 HRB with 45 % IACS and 180 W/m·K, in O60 to H04 and stress-relieved HR02–HR08 tempers. Elongation is 6 %, formability rates 45 and the service limit is 180 °C, so severe bad-way bends and hot under-hood locations need review. C19020 is the more formable alternative in the same system. C19025 has a density of 8.9 g/cm³ (0.322 lb/in³), heavier than 77% of copper alloy grades. It melts at 1,070°C (1,958 °F). C19025 has a yield strength of 550 MPa (79.8 ksi) and a tensile strength of 585 MPa (84.8 ksi) — stronger than 92% of copper alloy grades. Elongation at break is 6% and the elastic modulus is 125 GPa (18.1 Msi).
What is C19025 used for?
- automotive connectors
- electronic terminals
- battery contacts
Advantages
- High strength — 550 MPa (79.8 ksi), better than 92% of copper alloy grades
- High electrical conductivity — 45 % IACS, better than 77% of copper alloy grades
- Conducts heat well — 180 W/m·K (104 BTU/hr·ft·°F), better than 75% of copper alloy grades
Limitations
- Limited ductility — 6%, worse than 89% of copper alloy grades
C19025 properties
Typical room-temperature values for C19025-HR04; bars are the position among copper alloy grades.
Physical3
C19025 has a density of 8.9 g/cm³ (0.322 lb/in³), heavier than 77% of copper alloy grades. It melts at 1,070°C (1,958 °F).
Mechanical11
C19025 has a yield strength of 550 MPa (79.8 ksi) and a tensile strength of 585 MPa (84.8 ksi) — stronger than 92% of copper alloy grades. Elongation at break is 6% and the elastic modulus is 125 GPa (18.1 Msi).
Thermal6
C19025 is rated for continuous service to 180°C (356 °F). It conducts heat at 180 W/m·K (104 BTU/hr·ft·°F), better than 75% of copper alloy grades. Thermal expansion is 17.5 µm/m·K (9.72 µin/in·°F).
Electrical3
C19025 conducts electricity at 45 % IACS, better than 77% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 57% of copper alloy grades.
Sustainability4
Producing a kilogram of C19025 takes about 57 MJ of energy and emits 3.9 kg of CO₂ — less than 52% of copper alloy grades. Typical recycled content is 30%.
Manufacturability7
C19025's machinability is poor (30/100, worse than 67% of copper alloy grades); weldability fair (45/100); formability fair (45/100).
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. C19025 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C19025
Is C19025 easy to machine?
Gummy, non-leaded copper alloy — use sharp positive-rake carbide, high speed and flood coolant; mostly stamped rather than machined.
Can C19025 be welded?
Resistance and laser spot welding are practical; any fusion welding locally anneals the cold-worked temper and drops contact force.
Can C19025 be formed, bent or molded?
Progressive-die stamping of thin strip; bend with grain direction in mind (GW ≈ 0.3–0.5 t at HR02, ≥1 t at HR06) and stress-relief bake after severe forming.
C19025 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 |
|---|---|---|
| Niprincipal strengthener with Sn/P | 0.8 – 1.8 | 1 |
| Snsolid-solution strengthening, improves stress relaxation | 0.5 – 1.5 | 0.9 |
| Pforms Ni-P precipitates, deoxidiser | 0.01 – 0.15 | 0.05 |
| Znimpurity limit | ≤ 0.2 | |
| Feimpurity limit | ≤ 0.1 | |
| Cu96.0 % min including Ag; balance | balance |
What surface finishes work on C19025?
Not anodisable — standard finishes are reflow/matte tin, nickel underplate with gold or silver flash for contact surfaces.
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).
How much does C19025 cost?
C19025 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.
C19025 — frequently asked
What is C19025 used for?
C19025 is typically used for automotive connectors, electronic terminals and battery contacts. In short: high-strength connector strip; stronger than C19020; 45 % IACS spring copper.
What is the yield strength of C19025?
C19025 has a typical yield strength of 550 MPa (79.8 ksi) and a tensile strength of 585 MPa (84.8 ksi) — stronger than 92% of copper alloy grades. Strength varies by condition: see the 7 listed tempers.
Is C19025 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 67% of copper alloy grades). Gummy, non-leaded copper alloy — use sharp positive-rake carbide, high speed and flood coolant; mostly stamped rather than machined.
Can C19025 be welded?
With care — weldability is rated fair (45/100). Resistance and laser spot welding are practical; any fusion welding locally anneals the cold-worked temper and drops contact force.
What surface finishes work on C19025?
Not anodisable — standard finishes are reflow/matte tin, nickel underplate with gold or silver flash for contact surfaces.
Can C19025 be formed, bent or molded?
Progressive-die stamping of thin strip; bend with grain direction in mind (GW ≈ 0.3–0.5 t at HR02, ≥1 t at HR06) and stress-relief bake after severe forming.
What is the maximum service temperature of C19025?
C19025 is rated for continuous use to about 180°C (356 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C19025-HR04 and C19025-O60?
HR04 is the default condition — the workhorse connector-strip temper: balanced spring force, bendability and stress-relaxation resistance. O60: pick for deep-drawn or severely formed parts where strength is added later by the customer's own work hardening. Yield strength is 550 MPa in HR04 versus 180 MPa in O60.
How much does C19025 cost?
C19025 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 B888/B888M — Copper Alloy Strip for Use in Manufacture of Electrical Connectors or Spring Contacts — ASTM International (2020)
- CDA Alloy Registration — C19025 (Cu-Ni-Sn-P) — Copper Development Association (2022)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- High-performance Cu-Ni-Sn-P connector strip (KLF-118 class) datasheet — Copper strip producer (2021)
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.