Copper Alloy C19700-H01
Supply condition
UNS C19700
H01 = quarter hard
Choose when forming severity is high but some added stiffness over annealed strip is needed.
Values for the H01 condition
Other C19700 tempers and conditions
C19700 is listed in 8 conditions; see the grade overview at C19700.
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 |
H01This page 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-H01?
C19700-H01 is C19700 supplied in the H01 condition — choose when forming severity is high but some added stiffness over annealed strip is needed. C19700-H01 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 315 MPa (45.7 ksi) — stronger than 54% of copper alloy grades. Elongation at break is 18% and the elastic modulus is 120 GPa (17.4 Msi). C19700-H01 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). H04 is the default condition FabDigit quotes; H01 is available on request or by drawing note.
Advantages
- Conducts heat well — 324 W/m·K (187.2 BTU/hr·ft·°F), better than 85% of copper alloy grades
- High electrical conductivity — 81 % IACS, better than 84% of copper alloy grades
- Forms and bends easily — 75/100, better than 82% of copper alloy grades
Limitations
- Limited service temperature — 175°C (347 °F), worse than 92% of copper alloy grades
C19700-H01 properties
Typical room-temperature values for C19700-H01; 19 are specific to this condition. Other listed values are C19700 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C19700-H01 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-H01 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 315 MPa (45.7 ksi) — stronger than 54% of copper alloy grades. Elongation at break is 18% and the elastic modulus is 120 GPa (17.4 Msi).
Thermal6
C19700-H01 is rated for continuous service to 175°C (347 °F). It conducts heat at 324 W/m·K (187.2 BTU/hr·ft·°F), better than 85% of copper alloy grades. Thermal expansion is 17.6 µm/m·K (9.78 µin/in·°F).
Electrical3
C19700-H01 conducts electricity at 81 % 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-H01 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-H01's machinability is poor (28/100, worse than 78% of copper alloy grades); weldability fair (45/100); formability very good (75/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C19700-H01
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.
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.
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 | — |
C19700-H01 — frequently asked
What is C19700-H01 used for?
C19700-H01 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-H01?
C19700-H01 has a typical yield strength of 250 MPa (36.3 ksi) and a tensile strength of 315 MPa (45.7 ksi) — stronger than 54% of copper alloy grades. Strength varies by condition: see the 8 listed tempers.
Is C19700-H01 easy to machine?
Not especially — machinability is rated poor (28/100, worse than 78% 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-H01 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-H01?
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-H01 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-H01?
C19700-H01 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 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.