Find out why stainless steel is the material of choice for building and construction…
Stainless steel is an ideal construction material in many ways, strong and resistant to corrosion. It has been used as a building material since the 1920s, which attests to its longevity and its enduring popularity. Some of the world’s most recognisable buildings (and other landmarks such as bridges, statues and monuments) have used stainless steel in their construction… Read More
Stainless steel has been used as a construction material since the 1920s, so it is certainly not a new product. In fact, its rising popularity in recent years is testament to how suitable it is for use in the building industry, with uses ranging from roofing and safety railings to architectural cladding. It has also been shown, due to its use over so many years, to have a long lifespan, which is an important consideration in construction… Read More
Stainless steel is a « green material » par excellence and is infinitely recyclable and recycled. Within the construction sector, its actual recovery rate is close to 100%… Read More
We’ve picked 8 Famous Stainless Steel Monuments and Sculptures from around the world… Read More
Stainless steel is the “green material” par excellence and is infinitely recyclable. Within the construction sector, its actual recovery rate is close to 100%… Read More
Electrolytic tin plating
Uginox Patina K44 stainless steel sheeting features electro-tinned coating (100% pure tin) on both sides. This thin metallic coating does not provide corrosion resistance; the plating in fact serves two purposes:
Over time, weathering causes the electroplated tin to form a uniform, matt grey finish (a patina) on the exposed surface of the rust free stainless steel base material. Patina formation takes a correspondingly longer time on unweathered surfaces. During the handling process handprints and mild staining can occur that may cause temporary blotchiness to the surface, these disappear as the patination of the surface develops into an even, matt grey surface finish. Uginox Patina K44 is supplied in an unweathered condition.
Applications of Uginox Patina – Uginox Patina K44
Uginox Patina K44 has proved itself to be an exemplary standard in aggressive environments. Accordingly, Uginox Patina K44 is more suitable for applications in aggressive industrial atmospheres and also in near coastal regions. Uginox Patina K44 is highly resistant to exposure to humic acids and is ideally suited to all kinds of rooftop vegetation. When attacked by particularly aggressive materials, in rare cases discoloration and streaking may form on the surface; however, these do not lead to corrosion of the stainless steel material. Should it be necessary to avoid such aesthetic issues, the use of Uginox Top is recommended as discoloration and streaking from the byproducts of chemical reactions do not typically form on its rolled matt surface. As with all materials individual material combinations may increase overall corrosion damage.
For more information please read the Uginox Technical Bulletin.
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K44 18% chromium with molybdenum, titanium and niobium stabilized.
The principal features of our K44 grade are:
Product range: Forms: sheets, blanks, coils, discs.
Thicknesses: 0.40 to 4 mm
(for other thicknesses, please consult us).
Width: according to thickness, consult us.
Finish: cold rolled, 2R and 2B (other finishes, please consult us).
For the full technical specification, please download the K44 data sheet.
What is corrosion?
Metals, with the exception of the precious metals such as gold and platinum, that are found in their natural state are always extracted from ores; metals have therefore a tendency to revert to their stable state, which corresponds to their original state, that is to say their oxide form.
Metal corrosion is essentially an electro-chemical reaction at the interface between metal and surrounding environment.
Stainless Steel and the passive layer
Steel is an alloy of iron and carbon. Contrary to carbon steel, the presence of a minimum of 10.5 % chromium in the stainless steel gives it the property of corrosion resistance.
However if this protective layer is damaged, the start of corrosion can appear.
What are the major factors of corrosion?
What are the 5 principal types of corrosion linked with the surrounding environment ?
Generalised corrosion is noticed when stainless steel is in contact with an acid medium and localised corrosion is seen in the majority of cases when stainless steel is placed in a neutral chloride environment.
UGINOX Patina K44 is a bistabilized ferritic stainless steel with an electro-tinned coating on both sides. This ferritic stainless steel is K44 and belongs to the KARA range: it contains 18% chromium and molybdenum and is stabilised with titanium and niobium. UGINOX Patina K44 weathers over time, acquiring a matt finish through natural patination giving a traditional rustic final appearance. UGINOX Patina K44 has the benefit of a high corrosion resistance, suitable for use in aggressive atmospheres.
Think Stabilised Stainless Steel !
UGINOX Patina K44 is naturally resistant to corrosion and suitable for any environment.*
UGINOX Patina K44 will adapt to any location for roofs including coastal / marine areas and installed according to current good practices (e.g. NF DTU 40.44 French Code). When exposed to the atmosphere the Tin coating will develop a natural patina. In roofing applications the change is noticeable after a few weeks and especially following rainfall the process will be substantially complete after a few months.
In vertical cladding or sheltered soffits the surface receives less moisture and the patina will take longer to develop. In such areas, where cleaning operations may also be required we recommend an alternative Aperam facade surface such as UGINOX Top.
Behaviour to localised corrosion
Along with the tinned coating, the corrosion resistance of the underlying base material is of primary importance.
Our dimensional range
*While every care has been taken to ensure that the information contained in this article is accurate as possible it should not be used as a guide without further consultation with the manufacturer.
Standing Seam Roofs
This traditional technique is distinguished by its linear rhythm; the standing seam gives it a particularly clear finish.
Assembled on site from stainless steel strips, these roofs are suited to both contemporary and traditional architecture.
The stainless steel strips are joined along their length by crimping of the previously raised edges. The bending or closing of the profile is performed in the traditional manner or using specialist tools.
The limited number of transverse seams and welds ensures maximum weathertightness. Standing seams can be used on warm or cold roofing systems.
Capacities relating to entirely roofing coverage types
The use of stainless steel enables the use of 14 to 30 metres lengths of strip – dependent upon national regulations – in thicknesses between 0.4 mm and 0.5 mm.
The widths installed depend on the project location (sheltered, normal or exposed) and on each country’s wind zones.
Affording freedom of form and appearance, stainless steel roofing blends into all environments and is suited to all styles of architecture, both new and renovation projects. Long lasting, easy to maintain and recyclable, it is also the sustainable material of choice.
The advantages of stainless steel for roofing and cladding…