Copper Alloy C15760 H04-HT900
Heat-treated state
UNS C15760
H04-HT900 = h04 + 1 h / 900 °C exposure
Reference condition showing property retention after brazing or high-temperature service — this is why DS copper is specified.
Values for the H04-HT900 condition
Other C15760 tempers and conditions
C15760 is listed in 7 conditions; see the grade overview at C15760.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
H04-HT900This page H04 + 1 h / 900 °C exposure | Reference condition showing property retention after brazing or high-temperature service — this is why DS copper is specified. | 360 | 470 | 20 | 120 HB | 79 % IACS |
As hot-extruded / as-consolidated | Pick for large-section bar, forging stock or parts that will see heavy machining and high-temperature brazing. | 385 | 490 | 18 | 130 HB | 78 % IACS |
HIP / forged plate & block | Choose for thick plate, heat-sink blocks and near-isotropic properties in large cross-sections. | 400 | 505 | 17 | 135 HB | 78 % IACS |
Quarter hard | Compromise temper when some bending or staking of the finished part is still required. | 440 | 525 | 16 | 140 HB | 78 % IACS |
Half hard | Use for machined electrode holders and mould inserts where a little residual ductility is wanted. | 490 | 555 | 14 | 152 HB | 78 % IACS |
H04Default Full hard | Standard stocked condition for resistance-welding electrodes, contacts and high-heat-flux components. | 545 | 600 | 11 | 165 HB | 78 % IACS |
Spring hard | Highest strength option for small-diameter electrode tips, pins and wire where ductility is not needed. | 615 | 655 | 8 | 178 HB | 77 % IACS |
What is C15760 H04-HT900?
C15760 H04-HT900 is C15760 heat treated to H04-HT900 — reference condition showing property retention after brazing or high-temperature service — this is why DS copper is specified. C15760 H04-HT900 has a yield strength of 360 MPa (52.2 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 74% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 130 GPa (18.9 Msi). C15760 H04-HT900 has a density of 8.81 g/cm³ (0.318 lb/in³), heavier than 63% of copper alloy grades. It melts at 1,083°C (1,981 °F). H04 is the default condition FabDigit quotes; H04-HT900 is available on request or by drawing note.
Advantages
- High service temperature — 550°C (1,022 °F), better than 100% of copper alloy grades
- Stiff — 130 GPa (18.9 Msi), better than 89% of copper alloy grades
- Conducts heat well — 325 W/m·K (187.8 BTU/hr·ft·°F), better than 85% of copper alloy grades
- High electrical conductivity — 79 % IACS, better than 83% of copper alloy grades
Limitations
- Needs corrosion protection — 45/100, worse than 98% of copper alloy grades
- Hard to polish — 60/100, worse than 92% of copper alloy grades
- High embodied carbon — 4.6 kg CO₂/kg, worse than 82% of copper alloy grades
C15760 H04-HT900 properties
Typical room-temperature values for C15760 H04-HT900; 22 are specific to this condition. Other listed values are C15760 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C15760 H04-HT900 has a density of 8.81 g/cm³ (0.318 lb/in³), heavier than 63% of copper alloy grades. It melts at 1,083°C (1,981 °F).
Mechanical16
C15760 H04-HT900 has a yield strength of 360 MPa (52.2 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 74% of copper alloy grades. Elongation at break is 20% and the elastic modulus is 130 GPa (18.9 Msi).
Thermal6
C15760 H04-HT900 is rated for continuous service to 550°C (1,022 °F). It conducts heat at 325 W/m·K (187.8 BTU/hr·ft·°F), better than 85% of copper alloy grades. Thermal expansion is 16.6 µm/m·K (9.22 µin/in·°F).
Electrical3
C15760 H04-HT900 conducts electricity at 79 % IACS, better than 83% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (45/100), worse than 98% of copper alloy grades.
Sustainability4
Producing a kilogram of C15760 H04-HT900 takes about 75 MJ of energy and emits 4.6 kg of CO₂ — more than 88% of copper alloy grades. Typical recycled content is 0%.
Manufacturability8
C15760 H04-HT900's machinability is poor (28/100, worse than 78% of copper alloy grades); weldability poor (30/100); formability fair (45/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C15760 H04-HT900
Is C15760 easy to machine?
Machine like tough OFC but with sharp carbide/PCD tooling, positive rake and generous coolant — the Al₂O₃ dispersoids abrade edges and rating is only ~20 % of AISI 1212.
Can C15760 be welded?
Avoid fusion welding where possible (porosity and dispersoid disruption); electron-beam, friction/inertia and resistance welding or vacuum brazing with Ag-Cu or Cu-Au fillers are the qualified routes.
Can C15760 be formed, bent or molded?
Cold bending is limited by the low uniform elongation; hot work above ~800 °C or specify the AE temper for forged shapes — it cannot be cast, since melting destroys the dispersion.
What surface finishes work on C15760?
Not anodisable; electroplate Ni/Ag for contact and vacuum service, or leave bare and expect normal copper tarnish above 200 °C in air.
C15760 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 |
|---|---|---|
| Al2O3dispersed alumina formed by internal oxidation of Cu-Al powder (~0.58 wt% Al equivalent) | 1.02 – 1.24 | 1.1 |
| Altotal aluminium, present as Al2O3 — designation AL-60 | 0.54 – 0.66 | 0.58 |
| Cu98.6 min including Ag | balance | — |
C15760 H04-HT900 — frequently asked
What is C15760 H04-HT900 used for?
C15760 H04-HT900 is typically used for resistance welding electrodes, rocket engine combustion liners, high-temperature electrical contacts and vacuum furnace fixtures. In short: softening-resistant conductive copper; holds strength to 500 °C; long-life welding electrode alloy.
What is the yield strength of C15760 H04-HT900?
C15760 H04-HT900 has a typical yield strength of 360 MPa (52.2 ksi) and a tensile strength of 470 MPa (68.2 ksi) — stronger than 74% of copper alloy grades. Strength varies by condition: see the 7 listed tempers.
Is C15760 H04-HT900 easy to machine?
Not especially — machinability is rated poor (28/100, worse than 78% of copper alloy grades). Machine like tough OFC but with sharp carbide/PCD tooling, positive rake and generous coolant — the Al₂O₃ dispersoids abrade edges and rating is only ~20 % of AISI 1212.
Can C15760 H04-HT900 be welded?
Not readily — weldability is rated poor (30/100). Avoid fusion welding where possible (porosity and dispersoid disruption); electron-beam, friction/inertia and resistance welding or vacuum brazing with Ag-Cu or Cu-Au fillers are the qualified routes.
What surface finishes work on C15760 H04-HT900?
Not anodisable; electroplate Ni/Ag for contact and vacuum service, or leave bare and expect normal copper tarnish above 200 °C in air.
Can C15760 H04-HT900 be formed, bent or molded?
Cold bending is limited by the low uniform elongation; hot work above ~800 °C or specify the AE temper for forged shapes — it cannot be cast, since melting destroys the dispersion.
What is the maximum service temperature of C15760 H04-HT900?
C15760 H04-HT900 is rated for continuous use to about 550°C (1,022 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C15760-H04 and C15760-AE?
H04 is the default condition — standard stocked condition for resistance-welding electrodes, contacts and high-heat-flux components. AE: pick for large-section bar, forging stock or parts that will see heavy machining and high-temperature brazing. Yield strength is 545 MPa in H04 versus 385 MPa in AE.
Sources
- CDA/UNS alloy record C15760 (Cu-Al2O3 dispersion strengthened copper) — Copper Development Association (2023)
- GlidCop Dispersion Strengthened Copper AL-15/AL-25/AL-60 property data — SCM Metal Products / Höganäs (2020)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys, dispersion-strengthened coppers — ASM International (1990)
- ASTM B934 / RWMA Class 20 practice for dispersion-strengthened copper — ASTM / RWMA (2019)
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.