Zinc Alloy Zn-Cu-Ti · temper · default condition
Zinc Alloy Zn-Cu-Ti-O
Properties of the O condition, compared with the other Zn-Cu-Ti tempers.
Standard stocked condition: shiny mill-rolled EN 988 sheet or coil that weathers naturally to a grey patina over 6 months–3 years.
What is Zn-Cu-Ti-O?
Zn-Cu-Ti-O is Zn-Cu-Ti in the O temper — standard stocked condition: shiny mill-rolled EN 988 sheet or coil that weathers naturally to a grey patina over 6 months–3 years. Zn-Cu-Ti-O has a yield strength of 120 MPa (17.4 ksi) and a tensile strength of 165 MPa (23.9 ksi) — weaker than 64% of zinc alloy grades. Elongation at break is 42% and the elastic modulus is 85 GPa (12.3 Msi). Zn-Cu-Ti-O has a density of 7.2 g/cm³ (0.26 lb/in³), heavier than 100% of zinc alloy grades. It melts at 418°C (784 °F).
Advantages
- Ductile — tolerates forming and impact — 42%, better than 100% of zinc alloy grades
- Good corrosion resistance — 60/100, better than 100% of zinc alloy grades
- Readily welded — 40/100, better than 93% of zinc alloy grades
- Forms and bends easily — 85/100, better than 92% of zinc alloy grades
Limitations
- Hard to polish — 55/100, worse than 79% of zinc alloy grades
Zn-Cu-Ti-O properties
Typical room-temperature values for Zn-Cu-Ti-O — 6 properties are specific to this condition; the rest are grade-level values shared by every Zn-Cu-Ti temper. Each bar shows where the value sits among the zinc alloy grades in FabDigit's library — further right is higher.
Physical3
Zn-Cu-Ti-O has a density of 7.2 g/cm³ (0.26 lb/in³), heavier than 100% of zinc alloy grades. It melts at 418°C (784 °F).
Mechanical11
Zn-Cu-Ti-O has a yield strength of 120 MPa (17.4 ksi) and a tensile strength of 165 MPa (23.9 ksi) — weaker than 64% of zinc alloy grades. Elongation at break is 42% and the elastic modulus is 85 GPa (12.3 Msi).
Thermal6
Zn-Cu-Ti-O is rated for continuous service to 100°C (212 °F). It conducts heat at 109 W/m·K (63 BTU/hr·ft·°F), worse than 86% of zinc alloy grades. Thermal expansion is 22 µm/m·K (12.2 µin/in·°F).
Electrical3
Zn-Cu-Ti-O conducts electricity at 27 % IACS, worse than 57% of zinc alloy grades.
Chemical & Environmental3
Corrosion resistance is good (60/100), better than 100% of zinc alloy grades.
Sustainability4
Producing a kilogram of Zn-Cu-Ti-O takes about 53 MJ of energy and emits 3.6 kg of CO₂ — less than 68% of zinc alloy grades. Typical recycled content is 25%.
Manufacturability7
Zn-Cu-Ti-O's machinability is very good (75/100, worse than 79% of zinc alloy grades); weldability fair (40/100); formability excellent (85/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other Zn-Cu-Ti tempers and conditions
Zn-Cu-Ti is also supplied in 3 other conditions. The full side-by-side table is on the Zn-Cu-Ti overview.
- ODefaultStandard stocked condition: shiny mill-rolled EN 988 sheet or coil that weathers naturally to a grey patina over 6 months–3 years.120 MPa yield · 47 HB
Working with Zn-Cu-Ti-O
Is Zn-Cu-Ti easy to machine?
Cuts, shears and punches easily but is soft and gummy — use sharp positive-rake tools, high speed, light feed and paraffin/emulsion lubricant; deburr edges to avoid crevice corrosion.
Can Zn-Cu-Ti be welded?
Normally joined by soft soldering (Sn-Cu/Sn-Pb with zinc chloride flux) or mechanical seaming; fusion welding needs zinc filler and tight heat control because the metal melts at ~418 °C.
Can Zn-Cu-Ti be formed, bent or molded?
Roll-form, profile, deep-draw and standing-seam readily, but only above ~7–10 °C material temperature (pre-warm in cold weather) and bend transverse to the rolling direction where possible.
What surface finishes work on Zn-Cu-Ti?
No anodising; leave bright for natural patina, specify chemical pre-weathering (blue-grey/graphite) for immediate uniform tone, or coil coating for colour — never let it contact copper, bare steel, wet mortar or acidic timber run-off.
Zn-Cu-Ti 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 |
|---|---|---|
| Custrength and creep resistance; most roofing zinc runs 0.10–0.20% | 0.08 – 1 | 0.15 |
| Tigrain refinement, strongly reduces room-temperature creep | 0.06 – 0.2 | 0.09 |
| Alcastability/oxidation control, kept low | ≤ 0.02 | 0.01 |
| Pbimpurity limit (Zn 99.995 base per EN 1179) | ≤ 0 | — |
| Cdimpurity limit | ≤ 0 | — |
| Feimpurity limit | ≤ 0 | — |
| Snimpurity limit | ≤ 0 | — |
| Znbalance, from Z1 (99.995%) special high-grade zinc | balance | — |
Zn-Cu-Ti-O — frequently asked
What is Zn-Cu-Ti-O used for?
Zn-Cu-Ti-O is typically used for standing-seam roof cladding, facade and wall panels, gutters and downpipes, flashings, copings and drip edges, dormer and chimney covers and interior decorative panels and trim. In short: cold-rolled architectural zinc.
What is the yield strength of Zn-Cu-Ti-O?
Zn-Cu-Ti-O has a typical yield strength of 120 MPa (17.4 ksi) and a tensile strength of 165 MPa (23.9 ksi) — weaker than 64% of zinc alloy grades. Strength varies by condition: see the 4 listed tempers.
Is Zn-Cu-Ti-O easy to machine?
Yes — machinability is rated very good (75/100, worse than 79% of zinc alloy grades). Cuts, shears and punches easily but is soft and gummy — use sharp positive-rake tools, high speed, light feed and paraffin/emulsion lubricant; deburr edges to avoid crevice corrosion.
Can Zn-Cu-Ti-O be welded?
With care — weldability is rated fair (40/100). Normally joined by soft soldering (Sn-Cu/Sn-Pb with zinc chloride flux) or mechanical seaming; fusion welding needs zinc filler and tight heat control because the metal melts at ~418 °C.
What surface finishes work on Zn-Cu-Ti-O?
No anodising; leave bright for natural patina, specify chemical pre-weathering (blue-grey/graphite) for immediate uniform tone, or coil coating for colour — never let it contact copper, bare steel, wet mortar or acidic timber run-off.
Can Zn-Cu-Ti-O be formed, bent or molded?
Roll-form, profile, deep-draw and standing-seam readily, but only above ~7–10 °C material temperature (pre-warm in cold weather) and bend transverse to the rolling direction where possible.
What is the maximum service temperature of Zn-Cu-Ti-O?
Zn-Cu-Ti-O is rated for continuous use to about 100°C (212 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Zn-Cu-Ti-O and Zn-Cu-Ti-H?
O is the default condition — standard stocked condition: shiny mill-rolled EN 988 sheet or coil that weathers naturally to a grey patina over 6 months–3 years. H: choose for stamped/flat-lock panels and profiles needing extra stiffness and dent resistance; less bend capacity than the natural soft-rolled temper. Yield strength is 120 MPa in O versus 155 MPa in H.
Can FabDigit make parts in Zn-Cu-Ti-O?
Yes — Zn-Cu-Ti-O is available for CNC machining and sheet metal with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- EN 988 — Zinc and zinc alloys: specification for rolled flat products for building — CEN (1997)
- EN 1179 — Zinc and zinc alloys: primary zinc — CEN (2003)
- ASTM B69 — Standard Specification for Rolled Zinc — ASTM (2016)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys (Zinc and Zinc Alloys) — ASM International (1990)
- RHEINZINK titanium zinc technical data / prePATINA — RHEINZINK GmbH (2023)
- VMZINC technical guide (QUARTZ-ZINC, ANTHRA-ZINC, PIGMENTO) — VMZINC / Umicore (2022)
- CES/Granta EduPack — zinc, rolled sheet eco-properties — Ansys Granta (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.