Copper Alloy C19800-H04
Supply condition · default condition
UNS C19800
H04 = full hard
Default stocked strip temper for stamped connectors and terminals needing high contact force.
Values for the H04 condition
Other C19800 tempers and conditions
C19800 is listed in 7 conditions; see the grade overview at C19800.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Pick for deep drawing or severe forming where strength is added later by work hardening. | 140 | 320 | 32 | 40 HRB | 48 % IACS |
Quarter hard | Pick when forming severity is high but the annealed strength is insufficient. | 320 | 395 | 15 | 118 HB | 46 % IACS |
Half hard | Balanced temper: bends to tight radii in both grain directions while giving ~450 MPa strength. | 415 | 455 | 8 | 77 HRB | 45 % IACS |
H04DefaultThis page Full hard | Default stocked strip temper for stamped connectors and terminals needing high contact force. | 495 | 520 | 4 | 82 HRB | 45 % IACS |
Mill hardened, full hard | Pick when improved stress-relaxation resistance and better bendability at similar strength are needed for under-hood connectors. | 510 | 530 | 6 | 160 HB | 47 % IACS |
Extra hard | Pick for flat springs and contacts where maximum strength matters and bends are gentle/lengthwise only. | 550 | 570 | 3 | 87 HRB | 44 % IACS |
Spring hard | Pick for thin spring contacts where the highest elastic limit is required and forming is minimal. | 595 | 615 | 2 | 11 HRC | 43 % IACS |
What is C19800-H04?
C19800-H04 is C19800 supplied in the H04 condition — default stocked strip temper for stamped connectors and terminals needing high contact force. C19800-H04 has a yield strength of 495 MPa (71.8 ksi) and a tensile strength of 520 MPa (75.4 ksi) — stronger than 89% of copper alloy grades. Elongation at break is 4% and the elastic modulus is 120 GPa (17.4 Msi). C19800-H04 has a density of 8.89 g/cm³ (0.321 lb/in³), heavier than 72% of copper alloy grades. It melts at 1,020°C (1,868 °F).
Advantages
- High strength — 495 MPa (71.8 ksi), better than 89% 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 — 4%, worse than 96% of copper alloy grades
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
- Difficult to machine — 22/100, worse than 94% of copper alloy grades
C19800-H04 properties
Typical room-temperature values for C19800-H04; 12 are specific to this condition. Other listed values are C19800 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C19800-H04 has a density of 8.89 g/cm³ (0.321 lb/in³), heavier than 72% of copper alloy grades. It melts at 1,020°C (1,868 °F).
Mechanical11
C19800-H04 has a yield strength of 495 MPa (71.8 ksi) and a tensile strength of 520 MPa (75.4 ksi) — stronger than 89% of copper alloy grades. Elongation at break is 4% and the elastic modulus is 120 GPa (17.4 Msi).
Thermal6
C19800-H04 is rated for continuous service to 150°C (302 °F). It conducts heat at 180 W/m·K (104 BTU/hr·ft·°F), better than 75% of copper alloy grades. Thermal expansion is 17.6 µm/m·K (9.78 µin/in·°F).
Electrical3
C19800-H04 conducts electricity at 45 % IACS, better than 77% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 58% of copper alloy grades.
Sustainability4
Producing a kilogram of C19800-H04 takes about 58 MJ of energy and emits 3.8 kg of CO₂ — more than 61% of copper alloy grades. Typical recycled content is 35%.
Manufacturability7
C19800-H04's machinability is poor (22/100, worse than 94% of copper alloy grades); weldability fair (45/100); formability fair (45/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C19800-H04
Is C19800 easy to machine?
Gummy and low-rated (~20 % of AISI 1212); use sharp positive-rake tools, high speed, generous coolant — stamping and coining are the normal shaping routes, not turning.
Can C19800 be welded?
Resistance and laser welding of thin strip are practical; any fusion process locally anneals the cold-worked temper, and Mg/Zn loss can cause porosity, so soldering or crimping is preferred.
Can C19800 be formed, bent or molded?
Excellent progressive-die stamping stock; H04 typically bends 90° at ~1t good-way and ~2t bad-way, so orient tight bends to the rolling direction and specify TM tempers for severe forms.
What surface finishes work on C19800?
Not anodisable — standard finishes are hot-dip or reflow tin, tin-lead, nickel underplate with gold or silver on contact zones; solderability is excellent after light acid cleaning.
C19800 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 |
|---|---|---|
| Snsolid-solution strengthener | 0.6 – 1.2 | 0.9 |
| Znimproves stress-relaxation and solderability | 0.4 – 1 | 0.7 |
| Mgdeoxidiser / relaxation resistance | 0.03 – 0.15 | 0.08 |
| Presidual deoxidiser | 0 – 0.05 | 0.02 |
| Feimpurity limit | ≤ 0.05 | — |
| Pbimpurity limit | ≤ 0.02 | — |
| Cubalance, Cu + named elements ≥ 99.8 % | balance | — |
C19800-H04 — frequently asked
What is C19800-H04 used for?
C19800-H04 is typically used for automotive electrical terminals, connectors and battery clips. In short: high-strength connector copper; 495 MPa yield, 45% IACS; stamping-grade strip alloy.
What is the yield strength of C19800-H04?
C19800-H04 has a typical yield strength of 495 MPa (71.8 ksi) and a tensile strength of 520 MPa (75.4 ksi) — stronger than 89% of copper alloy grades. Strength varies by condition: see the 7 listed tempers.
Is C19800-H04 easy to machine?
Not especially — machinability is rated poor (22/100, worse than 94% of copper alloy grades). Gummy and low-rated (~20 % of AISI 1212); use sharp positive-rake tools, high speed, generous coolant — stamping and coining are the normal shaping routes, not turning.
Can C19800-H04 be welded?
With care — weldability is rated fair (45/100). Resistance and laser welding of thin strip are practical; any fusion process locally anneals the cold-worked temper, and Mg/Zn loss can cause porosity, so soldering or crimping is preferred.
What surface finishes work on C19800-H04?
Not anodisable — standard finishes are hot-dip or reflow tin, tin-lead, nickel underplate with gold or silver on contact zones; solderability is excellent after light acid cleaning.
Can C19800-H04 be formed, bent or molded?
Excellent progressive-die stamping stock; H04 typically bends 90° at ~1t good-way and ~2t bad-way, so orient tight bends to the rolling direction and specify TM tempers for severe forms.
What is the maximum service temperature of C19800-H04?
C19800-H04 is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C19800-H04 and C19800-O60?
H04 is the default condition — default stocked strip temper for stamped connectors and terminals needing high contact force. O60: pick for deep drawing or severe forming where strength is added later by work hardening. Yield strength is 495 MPa in H04 versus 140 MPa in O60.
Sources
- ASTM B888 / B465 — copper alloy strip for electrical connectors (temper definitions) — ASTM International (2021)
- ASTM B601 — Temper Designations for Copper and Copper Alloys — ASTM International (2019)
- CDA UNS Copper Alloy Registration (C19xxx dilute copper alloys) — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials (copper alloys) — ASM International (2005)
- High-performance copper connector strip datasheets (Wieland / KME / Ningbo Xingye class products) — various producers (2023)
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.