Copper Alloy C19210-H08
Supply condition
UNS C19210
H08 = spring hard
Pick for flat springs and pressure contacts where conductivity matters more than relaxation life.
Values for the H08 condition
Other C19210 tempers and conditions
C19210 is listed in 9 conditions; see the grade overview at C19210.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Pick for deep-formed or severely bent parts and for maximum conductivity. | 80 | 240 | 38 | 15 HRB | 92 % IACS |
Quarter hard | Pick when moderate strength must be combined with tight-radius forming. | 225 | 280 | 15 | 90 HB | 91 % IACS |
Half hard | The standard compromise temper for stamped terminals and lead frames needing 90° bends. | 285 | 320 | 9 | 104 HB | 90 % IACS |
Three-quarter hard | Intermediate step when H02 is too soft but H04 cracks on the bend line. | 315 | 345 | 7 | 112 HB | 90 % IACS |
Stress-relief / stabilizing anneal after cold rolling | Pick when flatness and dimensional stability of stamped lead frames through die-attach bakes are critical. | 340 | 360 | 6 | 112 HB | 91 % IACS |
H04Default Full hard | Default stocked lead-frame / terminal strip temper: best strength-to-formability balance at 90 % IACS. | 345 | 370 | 5 | 60 HRB | 90 % IACS |
Extra hard | Pick for flat stamped contacts needing higher yield with only gentle forming. | 380 | 400 | 4 | 126 HB | 89 % IACS |
H08This page Spring hard | Pick for flat springs and pressure contacts where conductivity matters more than relaxation life. | 410 | 430 | 3 | 134 HB | 88 % IACS |
Extra spring hard | Maximum cold-rolled strength for thin flat springs; essentially no forming capability across the grain. | 445 | 460 | 2 | 142 HB | 88 % IACS |
What is C19210-H08?
C19210-H08 is C19210 supplied in the H08 condition — pick for flat springs and pressure contacts where conductivity matters more than relaxation life. C19210-H08 has a yield strength of 410 MPa (59.5 ksi) and a tensile strength of 430 MPa (62.4 ksi) — stronger than 81% of copper alloy grades. Elongation at break is 3% and the elastic modulus is 122 GPa (17.7 Msi). C19210-H08 has a density of 8.91 g/cm³ (0.322 lb/in³), heavier than 80% of copper alloy grades. It melts at 1,080°C (1,976 °F). H04 is the default condition FabDigit quotes; H08 is available on request or by drawing note.
Advantages
- Conducts heat well — 350 W/m·K (202.2 BTU/hr·ft·°F), better than 88% of copper alloy grades
- High electrical conductivity — 88 % IACS, better than 86% of copper alloy grades
- High strength — 410 MPa (59.5 ksi), better than 81% of copper alloy grades
Limitations
- Limited ductility — 3%, worse than 97% of copper alloy grades
- Limited service temperature — 175°C (347 °F), worse than 92% of copper alloy grades
C19210-H08 properties
Typical room-temperature values for C19210-H08; 18 are specific to this condition. Other listed values are C19210 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C19210-H08 has a density of 8.91 g/cm³ (0.322 lb/in³), heavier than 80% of copper alloy grades. It melts at 1,080°C (1,976 °F).
Mechanical11
C19210-H08 has a yield strength of 410 MPa (59.5 ksi) and a tensile strength of 430 MPa (62.4 ksi) — stronger than 81% of copper alloy grades. Elongation at break is 3% and the elastic modulus is 122 GPa (17.7 Msi).
Thermal6
C19210-H08 is rated for continuous service to 175°C (347 °F). It conducts heat at 350 W/m·K (202.2 BTU/hr·ft·°F), better than 88% of copper alloy grades. Thermal expansion is 17.6 µm/m·K (9.78 µin/in·°F).
Electrical3
C19210-H08 conducts electricity at 88 % IACS, better than 86% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 86% of copper alloy grades.
Sustainability4
Producing a kilogram of C19210-H08 takes about 58 MJ of energy and emits 3.6 kg of CO₂ — more than 61% of copper alloy grades. Typical recycled content is 25%.
Manufacturability7
C19210-H08's machinability is poor (30/100, worse than 67% of copper alloy grades); weldability fair (40/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C19210-H08
Is C19210 easy to machine?
Gummy like pure copper (≈20 % of AISI 1212): use sharp positive-rake tools, high speed, light feed and flood coolant; hard tempers machine and blank cleaner than annealed.
Can C19210 be welded?
Resistance, laser and ultrasonic joining work well on thin strip; fusion welding is difficult because of the very high thermal conductivity, and phosphorus-bearing filler is preferred.
Can C19210 be formed, bent or molded?
Excellent progressive-die stamping and bending; bend H04 with the fold across the rolling direction and anneal (350–500 °C) between severe forming steps.
What surface finishes work on C19210?
Solders and silver/tin/nickel-plates readily after acid pickling; no anodizing — apply an antitarnish or plated layer since bare surfaces oxidize during bake cycles.
C19210 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 |
|---|---|---|
| Fe | 0.05 – 0.15 | 0.1 |
| P | 0.03 – 0.04 | 0.03 |
| Pbimpurity limit | ≤ 0.03 | — |
| Znimpurity limit | ≤ 0.05 | — |
| other (each)residual elements | ≤ 0.03 | — |
| Cu99.8 % min including Ag | balance | — |
C19210-H08 — frequently asked
What is C19210-H08 used for?
C19210-H08 is typically used for semiconductor lead frames, electrical terminals, connectors and relay parts. In short: 90 % IACS lead-frame copper; low-cost stamping strip; conductivity before strength.
What is the yield strength of C19210-H08?
C19210-H08 has a typical yield strength of 410 MPa (59.5 ksi) and a tensile strength of 430 MPa (62.4 ksi) — stronger than 81% of copper alloy grades. Strength varies by condition: see the 9 listed tempers.
Is C19210-H08 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, light feed and flood coolant; hard tempers machine and blank cleaner than annealed.
Can C19210-H08 be welded?
With care — weldability is rated fair (40/100). Resistance, laser and ultrasonic joining work well on thin strip; fusion welding is difficult because of the very high thermal conductivity, and phosphorus-bearing filler is preferred.
What surface finishes work on C19210-H08?
Solders and silver/tin/nickel-plates readily after acid pickling; no anodizing — apply an antitarnish or plated layer since bare surfaces oxidize during bake cycles.
Can C19210-H08 be formed, bent or molded?
Excellent progressive-die stamping and bending; bend H04 with the fold across the rolling direction and anneal (350–500 °C) between severe forming steps.
What is the maximum service temperature of C19210-H08?
C19210-H08 is rated for continuous use to about 175°C (347 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C19210-H04 and C19210-O60?
H04 is the default condition — default stocked lead-frame / terminal strip temper: best strength-to-formability balance at 90 % IACS. O60: pick for deep-formed or severely bent parts and for maximum conductivity. Yield strength is 345 MPa in H04 versus 80 MPa in O60.
Sources
- CDA Alloy Datasheet C19210 (Cu-Fe-P) — Copper Development Association (2023)
- ASTM B888 / B888M — Copper Alloy Strip for Use in Manufacture of Electrical Connectors or Lead Frames — ASTM International (2020)
- ASTM B601 — Temper Designations for Copper and Copper Alloys — ASTM International (2019)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- GB/T 2059 / GB/T 2040 — SAC (2017)
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.