Zinc Alloy Zn99.99-HR (Hot rolled)
Supply condition
ASTM B69
Choose for thicker plate, anode plate and roofing where maximum ductility and flatness matter more than strength.
Values for the HR condition
Other Zn99.99 tempers and conditions
Zn99.99 is listed in 5 conditions; see the grade overview at Zn99.99.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Pick for the most severe deep drawing, spinning or repeated bending (battery cans, bellows, collapsible parts). | 30 | 115 | 60 | 30 HB | 28.5 % IACS |
HRThis page Hot rolled | Choose for thicker plate, anode plate and roofing where maximum ductility and flatness matter more than strength. | 45 | 130 | 50 | 35 HB | 28.3 % IACS |
CRDefault Cold rolled | Default stock condition for pure zinc sheet and strip: good strength/formability balance for cans, blanks, engraving plate and flashing. | 65 | 145 | 40 | 40 HB | — |
Half Hard | Use where moderate stiffness and springback are needed but some bending is still required (roof standing seams, stampings). | 90 | 160 | 25 | 44 HB | 28 % IACS |
Hardened | Highest strength and stiffness for flat springs, blanking stock and thin strip; note that pure zinc partially recovers/softens at room temperature over weeks. | 125 | 190 | 12 | 50 HB | 28 % IACS |
What is Zn99.99-HR?
Zn99.99-HR is Zn99.99 supplied in the HR condition — choose for thicker plate, anode plate and roofing where maximum ductility and flatness matter more than strength. Zn99.99-HR has a yield strength of 45 MPa (6.53 ksi) and a tensile strength of 130 MPa (18.9 ksi) — weaker than 86% of zinc alloy grades. Elongation at break is 50% and the elastic modulus is 96 GPa (13.9 Msi). Zn99.99-HR has a density of 7.14 g/cm³ (0.258 lb/in³), heavier than 82% of zinc alloy grades. It melts at 420°C (787 °F). CR is the default condition FabDigit quotes; HR is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 50%, better than 107% of zinc alloy grades
- Forms and bends easily — 85/100, better than 92% of zinc alloy grades
- Readily welded — 30/100, better than 75% of zinc alloy grades
Limitations
- Low strength — 45 MPa (6.53 ksi), worse than 86% of zinc alloy grades
- Difficult to machine — 62/100, worse than 86% of zinc alloy grades
- Hard to polish — 55/100, worse than 79% of zinc alloy grades
Zn99.99-HR properties
Typical room-temperature values for Zn99.99-HR; 18 are specific to this condition. Other listed values are Zn99.99 reference data and may not represent this condition. Bars are the position among zinc alloy grades.
Physical3
Zn99.99-HR has a density of 7.14 g/cm³ (0.258 lb/in³), heavier than 82% of zinc alloy grades. It melts at 420°C (787 °F).
Mechanical11
Zn99.99-HR has a yield strength of 45 MPa (6.53 ksi) and a tensile strength of 130 MPa (18.9 ksi) — weaker than 86% of zinc alloy grades. Elongation at break is 50% and the elastic modulus is 96 GPa (13.9 Msi).
Thermal6
Zn99.99-HR is rated for continuous service to 100°C (212 °F). It conducts heat at 116 W/m·K (67 BTU/hr·ft·°F), better than 86% of zinc alloy grades. Thermal expansion is 30 µm/m·K (16.7 µin/in·°F).
Electrical3
Zn99.99-HR conducts electricity at 28.3 % IACS, better than 89% of zinc alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (40/100), better than 50% of zinc alloy grades.
Sustainability4
Producing a kilogram of Zn99.99-HR takes about 53 MJ of energy and emits 3.5 kg of CO₂ — less than 68% of zinc alloy grades. Typical recycled content is 15%.
Manufacturability8
Zn99.99-HR's machinability is good (62/100, worse than 86% of zinc alloy grades); weldability poor (30/100); formability excellent (85/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Zn99.99-HR
Is Zn99.99 easy to machine?
Cuts easily but is soft and gummy — use sharp, high-rake HSS or carbide tools, generous top clearance, high speed and light feeds with a light lubricant; avoid built-up edge and burr-over on thin sheet.
Can Zn99.99 be welded?
Fusion welding is difficult (low melting point, rapid oxidation, ZnO fume); joining is normally by soldering with Sn-Zn/Zn-Al solders and acid flux, mechanical seaming, riveting or adhesive bonding — always with fume extraction.
Can Zn99.99 be formed, bent or molded?
Excellent bending, drawing and spinning; grain direction matters, and severe draws are best done warm (about 60–150 °C) — never hot-work above ~250 °C or below ~10 °C, and expect room-temperature creep in loaded parts.
What surface finishes work on Zn99.99?
Not anodisable — degrease and use chromate/trivalent passivation, phosphating with powder or wet paint, or leave to weather to a natural grey patina; can be mechanically brushed or bright-rolled but does not hold a high polish.
Zn99.99 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.
| Element | Spec limit (wt %) |
|---|---|
| Pb | ≤ 0.01 |
| Cd | ≤ 0 |
| Fe | ≤ 0 |
| Cu | ≤ 0 |
| Sn | ≤ 0 |
| Al | ≤ 0 |
| total impuritiessum of listed impurities per GB/T 470 Zn99.99 / ASTM B6 SHG | ≤ 0.01 |
| ZnSpecial High Grade / 0# high-purity zinc | ≥ 99.99 (balance) |
Zn99.99-HR — frequently asked
What is Zn99.99-HR used for?
Zn99.99-HR is typically used for battery cans, coinage blanks, gaskets and washers and die-stamped components. In short: most formable wrought zinc; high-purity battery-can stock; creeps at room temperature.
What is the yield strength of Zn99.99-HR?
Zn99.99-HR has a typical yield strength of 45 MPa (6.53 ksi) and a tensile strength of 130 MPa (18.9 ksi) — weaker than 86% of zinc alloy grades. Strength varies by condition: see the 5 listed tempers.
Is Zn99.99-HR easy to machine?
Reasonably — machinability is rated good (62/100, worse than 86% of zinc alloy grades). Cuts easily but is soft and gummy — use sharp, high-rake HSS or carbide tools, generous top clearance, high speed and light feeds with a light lubricant; avoid built-up edge and burr-over on thin sheet.
Can Zn99.99-HR be welded?
Not readily — weldability is rated poor (30/100). Fusion welding is difficult (low melting point, rapid oxidation, ZnO fume); joining is normally by soldering with Sn-Zn/Zn-Al solders and acid flux, mechanical seaming, riveting or adhesive bonding — always with fume extraction.
What surface finishes work on Zn99.99-HR?
Not anodisable — degrease and use chromate/trivalent passivation, phosphating with powder or wet paint, or leave to weather to a natural grey patina; can be mechanically brushed or bright-rolled but does not hold a high polish.
Can Zn99.99-HR be formed, bent or molded?
Excellent bending, drawing and spinning; grain direction matters, and severe draws are best done warm (about 60–150 °C) — never hot-work above ~250 °C or below ~10 °C, and expect room-temperature creep in loaded parts.
What is the maximum service temperature of Zn99.99-HR?
Zn99.99-HR 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 Zn99.99-CR and Zn99.99-H?
CR is the default condition — default stock condition for pure zinc sheet and strip: good strength/formability balance for cans, blanks, engraving plate and flashing. H: highest strength and stiffness for flat springs, blanking stock and thin strip; note that pure zinc partially recovers/softens at room temperature over weeks. Yield strength is 65 MPa in CR versus 125 MPa in H.
Sources
- ASTM B69 – Standard Specification for Rolled Zinc — ASTM International (2016)
- ASTM B6 – Standard Specification for Zinc (SHG grade) — ASTM International (2018)
- GB/T 470 (2008)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys (Zinc and Zinc Alloys) — ASM International (1990)
- International Zinc Association — zinc LCA and property data — IZA (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.