Zinc Alloy Zn-Cu-Ti
also Preweathered Zinc
Zn-Cu-Ti is wrought rolled zinc with small copper and titanium additions (ASTM B69, EN 988) that raise creep resistance while keeping sheet formability.
Values for the O condition
Zn-Cu-Ti tempers and conditions
Zn-Cu-Ti is supplied in 3 conditions, soft to hard. O is the default FabDigit quotes; the values on this page are for it.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ODefault Annealed | Standard stocked condition: shiny mill-rolled EN 988 sheet or coil that weathers naturally to a grey patina over 6 months–3 years. | 120 | 165 | 42 | 47 HB | 27 % IACS |
dark grey/anthracite pickled surface | Dark anthracite architectural finish for contemporary façades; same base alloy and mechanics, deeper acid-pickled patina layer. | 120 | 165 | 40 | 47 HB | 27 % IACS |
Hardened | Choose for stamped/flat-lock panels and profiles needing extra stiffness and dent resistance; less bend capacity than the natural soft-rolled temper. | 155 | 200 | 25 | 55 HB | 26.5 % IACS |
Supply forms, finishes and certifications
Ways Zn-Cu-Ti is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
PREWEATHERED | Pre-weathered | Surface finish |
What is Zn-Cu-Ti?
Zn-Cu-Ti is wrought rolled zinc with small copper and titanium additions (ASTM B69, EN 988) that raise creep resistance while keeping sheet formability. It is chosen for architectural roofing and facades: 120 MPa yield, 165 MPa tensile, 42% elongation and 47 HB (formability score 85) allow roll-forming, standing-seam work and deep drawing, and the surface self-patinates to a stable grey. Limits are the ~418 °C melting point, low hardness, ambient-temperature creep under sustained load, and moderate corrosion resistance (score 60) with galvanic attack next to copper or wet mortar. Pre-weathered or coil-coated material is used when uniform tone is required from day one. Zn-Cu-Ti 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). Zn-Cu-Ti 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).
What is Zn-Cu-Ti used for?
- Standing-seam roof cladding
- Facade and wall panels
- Gutters and downpipes
- Flashings, copings and drip edges
- Dormer and chimney covers
- Interior decorative panels and trim
- Formed ornamental sheet-metal profiles
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 properties
Typical room-temperature values for Zn-Cu-Ti-O; bars are the position among zinc alloy grades.
Physical3
Zn-Cu-Ti 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).
Mechanical12
Zn-Cu-Ti 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 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 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 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'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.
Strength versus weight in the zinc alloy family
Yield strength against density for every zinc alloy grade FabDigit runs. Zn-Cu-Ti is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Zn-Cu-Ti
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.
Manufacturability
The process limits FabDigit's quote engine applies to Zn-Cu-Ti. Design inside these and the part quotes instantly; outside them it routes to an engineer.
CNC machining
| Machinability | Excellent75 / 100 |
|---|---|
| Cutting speed (rough / finish) | — / — |
| Minimum wall | — |
| Minimum internal radius | — |
| Drill depth limit | |
| Best surface (machined / polished) | Ra — / — |
| Hardenable after machining | — |
Sheet metal
| Formability | Better85 / 100 |
|---|---|
| Weldability | Fair40 / 100 |
| Bendable | Yes |
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 |
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.
Surface treatments FabDigit runs on zinc alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Organic Coating
Equivalent designations
Standards and trade names that resolve to Zinc Alloy Zn-Cu-Ti in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Trade names
- Preweathered Zinc
- Also called
- Titanium Zinc
- Similar grades
- B69988
How much does Zn-Cu-Ti cost?
Zn-Cu-Ti is a standard-cost zinc alloy ($$), cheaper than about 81% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Zn-Cu-Ti — frequently asked
What is Zn-Cu-Ti used for?
Zn-Cu-Ti 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?
Zn-Cu-Ti 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 3 listed tempers.
Is Zn-Cu-Ti 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 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?
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 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?
Zn-Cu-Ti 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.
How much does Zn-Cu-Ti cost?
Zn-Cu-Ti is a standard-cost zinc alloy ($$), cheaper than about 81% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Can FabDigit make parts in Zn-Cu-Ti?
Yes — Zn-Cu-Ti 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; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.