Copper Alloy C19700
UNS C19700
C19700 is a lightly alloyed wrought copper from the C10000–C19999 family, strengthened by iron, phosphorus and magnesium additions combined with cold work to give stress-relaxation resistance at 80% IACS conductivity.
Reference datasheet — C19700 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 H04 condition
C19700 tempers and conditions
C19700 is supplied in 8 conditions, soft to hard. H04 is the default FabDigit quotes; the values on this page are for it.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Choose for deep drawing or severe forming where strength is developed later by forming/stress relief. | 130 | 275 | 30 | 35 HRB | 82 % IACS |
Quarter hard | Choose when forming severity is high but some added stiffness over annealed strip is needed. | 250 | 315 | 18 | 95 HB | 81 % IACS |
Half hard | Choose for stamped contacts and terminals needing tight-radius bends with moderate spring force. | 310 | 350 | 12 | 65 HRB | 80 % IACS |
H04Default Full hard | The standard stocked temper: best all-round balance of spring force, formability and 80% IACS conductivity for connectors and lead frames. | 385 | 415 | 6 | 72 HRB | 80 % IACS |
Extra hard | Choose when higher contact force is required and bends are gentle or in the good-way (GW) direction. | 425 | 450 | 4 | 78 HRB | 79 % IACS |
Mill hardened, full hard | Choose when improved bend formability and low springback drift are needed at a given strength; low-temperature stress relief after rolling raises conductivity and relaxation resistance. | 440 | 460 | 5 | 140 HB | 84 % IACS |
Spring hard | Choose for spring contacts and clips needing high yield and good stress-relaxation resistance with simple forming. | 455 | 480 | 3 | 82 HRB | 79 % IACS |
Extra spring hard | Highest strength temper — pick for maximum contact normal force in flat or lightly formed parts. | 490 | 510 | 2 | 85 HRB | 78 % IACS |
What is C19700?
C19700 is a lightly alloyed wrought copper from the C10000–C19999 family, strengthened by iron, phosphorus and magnesium additions combined with cold work to give stress-relaxation resistance at 80% IACS conductivity. Engineers specify it as thin strip and coil for progressive-die stamped connectors and spring contacts where 385 MPa yield strength must coexist with 320 W/m·K thermal conductivity. Limits are low ductility in hard tempers (6% elongation in the default condition), a 200 °C service ceiling and poor machinability (score 30). C19800 is the nearest alternative when higher strength matters more than conductivity. C19700 has a density of 8.89 g/cm³ (0.321 lb/in³), heavier than 72% of copper alloy grades. It melts at 1,075°C (1,967 °F). C19700 has a yield strength of 385 MPa (55.8 ksi) and a tensile strength of 415 MPa (60.2 ksi) — stronger than 78% of copper alloy grades. Elongation at break is 6% and the elastic modulus is 120 GPa (17.4 Msi).
What is C19700 used for?
- springs and connectors
- electrical terminals
- relay contacts
Advantages
- Conducts heat well — 320 W/m·K (184.9 BTU/hr·ft·°F), better than 84% of copper alloy grades
- High electrical conductivity — 80 % IACS, better than 84% of copper alloy grades
- High strength — 385 MPa (55.8 ksi), better than 78% of copper alloy grades
Limitations
- Limited ductility — 6%, worse than 89% of copper alloy grades
C19700 properties
Typical room-temperature values for C19700-H04; bars are the position among copper alloy grades.
Physical3
C19700 has a density of 8.89 g/cm³ (0.321 lb/in³), heavier than 72% of copper alloy grades. It melts at 1,075°C (1,967 °F).
Mechanical11
C19700 has a yield strength of 385 MPa (55.8 ksi) and a tensile strength of 415 MPa (60.2 ksi) — stronger than 78% of copper alloy grades. Elongation at break is 6% and the elastic modulus is 120 GPa (17.4 Msi).
Thermal6
C19700 is rated for continuous service to 200°C (392 °F). It conducts heat at 320 W/m·K (184.9 BTU/hr·ft·°F), better than 84% of copper alloy grades. Thermal expansion is 17.6 µm/m·K (9.78 µin/in·°F).
Electrical3
C19700 conducts electricity at 80 % IACS, better than 84% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), worse than 76% of copper alloy grades.
Sustainability4
Producing a kilogram of C19700 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
C19700's machinability is poor (30/100, worse than 67% of copper alloy grades); weldability fair (45/100); formability good (55/100).
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. C19700 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C19700
Is C19700 easy to machine?
Gummy like pure copper (≈20% of AISI 1212) — use sharp positive-rake tools, high speed, flood coolant; stamping and progressive-die blanking are the normal removal routes.
Can C19700 be welded?
Excellent for resistance, laser and ultrasonic welding of thin strip; fusion arc welding is impractical due to high thermal conductivity and P/Mg loss.
Can C19700 be formed, bent or molded?
Formability drops sharply above H04 — specify GW/BW minimum bend radius (typically 0–1t at H02, 2–4t at H08/H10) and consider stress relief after forming to cut springback drift.
C19700 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 |
|---|---|---|
| Feforms fine Fe-rich/phosphide precipitates | 0.3 – 1.2 | 0.6 |
| P | 0.1 – 0.4 | 0.2 |
| Mgimproves stress-relaxation resistance | 0.01 – 0.2 | 0.05 |
| Pbimpurity limit | ≤ 0.03 | |
| Znimpurity limit | ≤ 0.2 | |
| CuCu + named elements ≥ 99.8%; Cu ≥ 99.0% incl. Ag | balance |
What surface finishes work on C19700?
Not anodizable; standard finishes are hot-dip or reflow tin, nickel underplate with gold or silver flash for contacts, or bare with anti-tarnish (BTA) coating.
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 C19700 cost?
C19700 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.
C19700 — frequently asked
What is C19700 used for?
C19700 is typically used for springs and connectors, electrical terminals and relay contacts. In short: high-conductivity spring copper; 80% IACS at 415 MPa; stress-relaxation resistant strip.
What is the yield strength of C19700?
C19700 has a typical yield strength of 385 MPa (55.8 ksi) and a tensile strength of 415 MPa (60.2 ksi) — stronger than 78% of copper alloy grades. Strength varies by condition: see the 8 listed tempers.
Is C19700 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 67% of copper alloy grades). Gummy like pure copper (≈20% of AISI 1212) — use sharp positive-rake tools, high speed, flood coolant; stamping and progressive-die blanking are the normal removal routes.
Can C19700 be welded?
With care — weldability is rated fair (45/100). Excellent for resistance, laser and ultrasonic welding of thin strip; fusion arc welding is impractical due to high thermal conductivity and P/Mg loss.
What surface finishes work on C19700?
Not anodizable; standard finishes are hot-dip or reflow tin, nickel underplate with gold or silver flash for contacts, or bare with anti-tarnish (BTA) coating.
Can C19700 be formed, bent or molded?
Formability drops sharply above H04 — specify GW/BW minimum bend radius (typically 0–1t at H02, 2–4t at H08/H10) and consider stress relief after forming to cut springback drift.
What is the maximum service temperature of C19700?
C19700 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 C19700-H04 and C19700-O60?
H04 is the default condition — the standard stocked temper: best all-round balance of spring force, formability and 80% IACS conductivity for connectors and lead frames. O60: choose for deep drawing or severe forming where strength is developed later by forming/stress relief. Yield strength is 385 MPa in H04 versus 130 MPa in O60.
How much does C19700 cost?
C19700 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
- CDA Alloy Datasheet C19700 — Copper Development Association (copper.org) (2023)
- ASTM B888/B888M — Copper Alloy Strip for Electrical Connectors — ASTM International (2020)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials (Copper) — ASM International (2005)
- GB/T 2059 / GB/T 2040 (2017)
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.