Copper Alloy C18900-H01
Supply condition
UNS C18900
H01 = quarter hard
Light cold work for parts that still need moderate bending but higher strength than annealed.
Values for the H01 condition
Other C18900 tempers and conditions
C18900 is listed in 6 conditions; see the grade overview at C18900.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Choose for welding wire/rod, deep drawing, bending and any forming operation needing maximum ductility. | 95 | 275 | 45 | 55 HB | 47 % IACS |
As hot rolled | As-extruded/hot-worked mill condition for large rod and shapes that will be machined or further cold drawn. | 130 | 285 | 38 | 62 HB | 46 % IACS |
H01This page Quarter hard | Light cold work for parts that still need moderate bending but higher strength than annealed. | 230 | 315 | 25 | 80 HB | 46 % IACS |
Half hard | General-purpose balance of strength and residual formability for machined and formed contact parts. | 305 | 355 | 15 | 98 HB | 45 % IACS |
H04Default Full hard | Standard stocked condition for rod, wire and contact tips where maximum strength, hardness and wear resistance are needed. | 370 | 405 | 8 | 115 HB | 45 % IACS |
Spring hard | Heavily drawn wire condition for springy contacts and high-strength conductor wire; very limited ductility. | 425 | 455 | 4 | 130 HB | 44 % IACS |
What is C18900-H01?
C18900-H01 is C18900 supplied in the H01 condition — light cold work for parts that still need moderate bending but higher strength than annealed. C18900-H01 has a yield strength of 230 MPa (33.4 ksi) and a tensile strength of 315 MPa (45.7 ksi) — stronger than 51% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 117 GPa (17 Msi). C18900-H01 has a density of 8.89 g/cm³ (0.321 lb/in³), heavier than 72% of copper alloy grades. It melts at 1,030°C (1,886 °F). H04 is the default condition FabDigit quotes; H01 is available on request or by drawing note.
Advantages
- Readily welded — 80/100, better than 93% of copper alloy grades
- Forms and bends easily — 70/100, better than 80% of copper alloy grades
- High electrical conductivity — 46 % IACS, better than 78% of copper alloy grades
- Conducts heat well — 184 W/m·K (106.3 BTU/hr·ft·°F), better than 76% of copper alloy grades
C18900-H01 properties
Typical room-temperature values for C18900-H01; 10 are specific to this condition. Other listed values are C18900 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C18900-H01 has a density of 8.89 g/cm³ (0.321 lb/in³), heavier than 72% of copper alloy grades. It melts at 1,030°C (1,886 °F).
Mechanical14
C18900-H01 has a yield strength of 230 MPa (33.4 ksi) and a tensile strength of 315 MPa (45.7 ksi) — stronger than 51% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C18900-H01 is rated for continuous service to 220°C (428 °F). It conducts heat at 184 W/m·K (106.3 BTU/hr·ft·°F), better than 76% of copper alloy grades. Thermal expansion is 17.6 µm/m·K (9.78 µin/in·°F).
Electrical3
C18900-H01 conducts electricity at 46 % IACS, better than 78% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (68/100), better than 69% of copper alloy grades.
Sustainability4
Producing a kilogram of C18900-H01 takes about 57 MJ of energy and emits 3.7 kg of CO₂ — less than 52% of copper alloy grades. Typical recycled content is 35%.
Manufacturability8
C18900-H01's machinability is poor (32/100, worse than 57% of copper alloy grades); weldability very good (80/100); formability very good (70/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C18900-H01
Is C18900 easy to machine?
Gummy like most non-leaded coppers — use sharp positive-rake carbide, high speed, generous feed and flood coolant; rating ≈ 20 % of AISI 1212 and best in H02/H04 tempers.
Can C18900 be welded?
Readily joined by GTAW/GMAW with matching or ErCu/ErCuSi filler; preheat thick sections for the high thermal conductivity, and expect full loss of cold-worked strength in the HAZ.
Can C18900 be formed, bent or molded?
Excellent cold formability in O60 (deep draw, roll, bend); in H04 keep bend radii ≥ 2t and interanneal at 450–600 °C for severe work.
What surface finishes work on C18900?
Not anodisable; takes bright polish, Ni/Sn/Ag electroplate and chemical patina well — degrease thoroughly and pickle to remove the tenacious Si-bearing oxide before plating.
C18900 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 – 0.9 | 0.75 |
| Sideoxidiser and strengthener | 0.1 – 0.3 | 0.2 |
| Mndeoxidiser / arc stabiliser in weld wire | 0.02 – 0.2 | 0.1 |
| Presidual | ≤ 0.05 | — |
| Feresidual | ≤ 0.05 | — |
| Pbresidual | ≤ 0.02 | — |
| CuCu + named elements ≥ 99.5 %; Ag counted as Cu | ≥ 98 (balance) | — |
C18900-H01 — frequently asked
What is C18900-H01 used for?
C18900-H01 is typically used for electrical connectors, fasteners requiring conductivity and marine hardware. In short: weldable silicon-bearing copper; strength with 45% IACS; marine-capable lightly alloyed copper.
What is the yield strength of C18900-H01?
C18900-H01 has a typical yield strength of 230 MPa (33.4 ksi) and a tensile strength of 315 MPa (45.7 ksi) — stronger than 51% of copper alloy grades. Strength varies by condition: see the 6 listed tempers.
Is C18900-H01 easy to machine?
Not especially — machinability is rated poor (32/100, worse than 57% of copper alloy grades). Gummy like most non-leaded coppers — use sharp positive-rake carbide, high speed, generous feed and flood coolant; rating ≈ 20 % of AISI 1212 and best in H02/H04 tempers.
Can C18900-H01 be welded?
Yes — weldability is rated very good (80/100). Readily joined by GTAW/GMAW with matching or ErCu/ErCuSi filler; preheat thick sections for the high thermal conductivity, and expect full loss of cold-worked strength in the HAZ.
What surface finishes work on C18900-H01?
Not anodisable; takes bright polish, Ni/Sn/Ag electroplate and chemical patina well — degrease thoroughly and pickle to remove the tenacious Si-bearing oxide before plating.
Can C18900-H01 be formed, bent or molded?
Excellent cold formability in O60 (deep draw, roll, bend); in H04 keep bend radii ≥ 2t and interanneal at 450–600 °C for severe work.
What is the maximum service temperature of C18900-H01?
C18900-H01 is rated for continuous use to about 220°C (428 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C18900-H04 and C18900-O60?
H04 is the default condition — standard stocked condition for rod, wire and contact tips where maximum strength, hardness and wear resistance are needed. O60: choose for welding wire/rod, deep drawing, bending and any forming operation needing maximum ductility. Yield strength is 370 MPa in H04 versus 95 MPa in O60.
Sources
- UNS C18900 alloy data (Copper Development Association alloy database) — CDA / copper.org (2023)
- ASTM B224 – Classification of Coppers — ASTM International (2021)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
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.