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Stainless Steel

Many types of stainless steel have been developed to resist different corrosive environments and working conditions ensuring that work is safe, products last longer and our food for example is hygienic.
These stainless steel grades normally have a minimum content of 10.5% chromium. Chromium makes the steel ‘stainless’ – this means improved corrosion resistance. Various milling and processing conditions influence the surface and mechanical properties.

Besides chromium, typical alloying elements are molybdenum, nickel and nitrogen. These elements, most of them traded on the London Metal Exchange, influence the price of the different alloys. Nickel is mostly alloyed to improve the formability and ductility of stainless steel, molybdenum influences its tensile strength and durability. Alloying these elements brings out different crystal structures, giving different properties in machining, forming, welding etc.

Please find below a description of some of the most commonly used stainless steel grades and standards.

T304 – EN 1.4301 / T304L – EN 1.4307

One of the most widely used general-purpose stainless steels. It possesses an excellent combination of strength and corrosion resistance, and it is easily fabricated. To reduce carbide precipitation when welding, it is recommended to use 1.4307 for its lower-carbon content.

T316 – EN 1.4401 / T316L – EN 1.4404

Superior corrosion resistance compared to other 300 series alloys when used in harsh corrosive environments (e.g sea water, chemicals, etc.). To reduce carbide precipitation when welding, it is recommended to use 1.4404 for its lower-carbon content.

T321 – EN 1.4541

Titanium stabilized stainless steel to prevent intergranular formation of chromium carbide. It exhibits strength characteristics superior to those of 1.4301 stainless, thus making it best suited for parts which cannot be subsequently annealed.

430 – EN 1.4016

A general-purpose non heat-treatable chromium type used for highly polished trim applications in mild atmospheres. Its strengths are in ductility, formability, good corrosion and oxidation resistance, thermal conductivity and finish quality.


Aluminium is particularly suitable because of its weight advantages: it is only one-third the weight of steel. It is also quite resistant to corrosion, even in an untreated condition.


An unalloyed (‘pure’) non-heat treatable rolled aluminium sheet engineered for general sheet metal work where high mechanical properties are not required.

5251 (NS4)

An alloyed non-heat treatable rolled aluminium sheet designed for general sheet metal work where higher mechanical properties and some formability are required.


Carbon steel (mild steel) is the most prone to corrosion and therefore the least expensive of the most commonly perforated metals.

Carbon steel is manufactured as either sheets or coil by roller flattening it to the desired thickness whilst the steel is still hot, or after it has cooled.
Differences in the processes result in products that differ in terms of cost, quality and mechanical properties.


HR steel is typically less expensive and produced in thicker gauges of 1.2 mm and upwards. HR and CR steel is the most likely to corrode and therefore the least expensive of the three metals most commonly perforated. Most grades can be protected against corrosion by post galvanising (dipping into hot zinc) or various painting treatments.


Cold rolled steel provides tighter tolerances and better surface finishes. While it can be produced in practically any gauge, it is most readily available in thinner gauges from 0.3 – 3 mm. This material can be electro galvanised (ELO), post galvanised or painted after the perforation process to be protected against corrosion.



HDG products are often used for indoor and outdoor applications when protection against corrosion is required. For outdoor applications this material is often painted or powder coated. HDG flat products are available from 0.3 – 3 mm.
Possible coating +Z80 – Z275 gr/m² (total on both sides), +AZ, +ZF