Zinc Wire Processing Technology: Steps, Grades and Packing
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Zinc Wire Processing Technology: The Route in Overview
Zinc wire processing turns primary zinc into a drawn, dimensionally controlled product for metallising, corrosion protection, mesh, baskets and forming operations. The production process involves several precision steps, and each step changes a different property: diameter, tensile strength, surface condition or final shape. Because zinc is a soft metal with a melting range close to 419.5 degrees Celsius and a strong tendency to recrystallise, the route is controlled mainly through temperature, lubrication and drawing speed rather than through heavy single-pass reduction.
Material Selection
Zinc wire is chosen against the finished product specification. Feedstock is selected from the 0.3-5.0 mm diameter range, and finished wire is supplied within a controlled band of 0.6 mm to 4.80 mm. Grade is fixed by purity: Zn 99.995 for the most demanding applications and Zn 99.99 where a slightly wider impurity window is acceptable. Zinc grades of this type are defined in EN 1179, which sets the minimum zinc content together with ceilings for lead, iron, cadmium, copper, tin and aluminium, while ASTM B833 covers zinc wire intended for thermal spraying.
Wire Drawing
Diameter is reduced through drawing machines, and the reduction works the metal so that tensile strength increases. Drawing also determines the surface finish that later galvanising and polishing steps build upon. Lubrication, die condition and the pass schedule are what prevent surface cracking and keep elongation within the required band as the wire is reduced stage by stage.
Riveting and Galvanising
Zinc wires are mechanically joined by riveting to produce extended continuous lengths, which is what makes long runs of mesh and baskets practical: a joint that holds under tension avoids stopping and restarting the line. Hot dip galvanising then improves corrosion resistance and produces a more uniform surface finish, which matters both for appearance and for service life in humid or marine exposure. Polishing is optional and is applied where a smooth or decorative surface is required.
Forming and Final Shaping
Final shaping covers bending, welding and cutting into finished products. Consistent diameter and elongation are what make forming predictable, because wire drawn to a stable specification bends to a repeatable radius and welds without losing section thickness at the joint.
Chemical Composition of Zn 99.995 and Zn 99.99 Wire
| Item | Zn 99.995 | Zn 99.99 |
|---|---|---|
| Zn, min | 99.995% | 99.99% |
| Pb, max | 0.004% | 0.005% |
| Fe, max | 0.003% | 0.005% |
| Cd, max | 0.002% | 0.003% |
| Cu, max | 0.001% | 0.002% |
| Sn, max | 0.001% | 0.001% |
| Al, max | 0.001% | 0.002% |
| Total impurities, max | 0.005% | 0.01% |
Every figure except the zinc content is a maximum, and the two grades are separated by a factor of about two in the total impurity allowance. That difference is what decides the choice in practice: the tighter grade is used where low lead and cadmium matter for the end use, and the standard grade where the wire is consumed in general forming and coating work.
Mechanical Characteristics
| Property | Zn 99.995 | Zn 99.99 |
|---|---|---|
| Specific gravity, g/cm3 | 7.13 ± 0.1 | 7.13 ± 0.1 |
| Melting range | 419.5 ± 1 ºC | 419.5 ± 1 ºC |
| Electrical resistivity at 20 ºC, mΩ.mm2/m | ≤ 70 | ≤ 70 |
| Tensile strength Rm, N/mm2 | 95-130 | 95-135 |
| Elongation after rupture, A (100 mm) | ≥ 30% | ≥ 20% |
| Diameter range | 0.6 mm ≤ diameter ≤ 4.80 mm | |
The narrow specific gravity and melting range windows confirm that both grades are effectively pure zinc, so the useful differences between them sit in the impurity ceilings and in the tensile and elongation bands rather than in density or melting behaviour.
Product Packing Options
| Package | Net weight | Dimensions |
|---|---|---|
| Hard paper drum | 150-250 kg | Outer diameter 550 mm, inner diameter 300 mm, variable height |
| Hard paper drum | 40-110 kg | Outer diameter 400 mm, inner diameter 190 mm, variable height |
| Plastic spool | 15 kg | Flange 300 mm, width 100 mm, centre hole 55 mm |
| Plastic spool | 20 kg | Flange 270 mm, width 103 mm, centre hole 55 mm |
| Steel drum | 380 kg | Outer diameter 560 mm, inner diameter 310 mm, height 800 mm |
| Bundle | 20-40 kg | Stacked on pallets |
Pallets are supplied in 1100 x 1100 mm, 1200 x 800 mm, 1000 x 1000 mm and 800 x 800 mm footprints, so the package can be matched to a standard container plan without repacking at the destination.
Quality Control and Environmental Safeguards
Strict quality control and environmental safeguards are prioritised throughout the route. Diameter is checked continuously against the specified band, tensile strength and elongation are verified on drawn samples, and chemistry is confirmed by analysis of the cast rather than by a nominal declaration. On the environmental side, drawing lubricants and galvanising baths are handled in closed systems so that the process remains compliant while still delivering a uniform surface finish. Technological advances continue to refine both efficiency and product performance, particularly in die life, spooling tension and surface consistency.
FAQ
Q: What diameter range is available for zinc wire?
Feedstock is selected from 0.3-5.0 mm and finished wire is supplied within a controlled band of 0.6 mm to 4.80 mm.
Q: Why is riveting used instead of welding for long lengths?
Riveting joins zinc wires mechanically into extended continuous lengths, which keeps mesh and basket production running without stopping the line.
Q: What does hot dip galvanising add to a zinc wire product?
It improves corrosion resistance and produces a more uniform surface finish, which supports both appearance and service life.
Q: Which purity grade should be specified?
Choose Zn 99.995 where lead and cadmium must be tightly limited, and Zn 99.99 for general forming and coating applications.
Q: How much does the impurity allowance differ between the two grades?
The total impurity ceiling is 0.005% for Zn 99.995 against 0.01% for Zn 99.99, a factor of roughly two.
Q: How is zinc wire packed for export?
Hard paper drums, plastic spools, steel drums and bundles are used, with net weights from 15 kg spools to 380 kg steel drums on standard pallets.
