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Our Top Five Must Read Blog Posts

1, Famous Buildings Constructed Using Stainless Steel

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

2, The Benefits of Stainless Steel in Architecture

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

3, The advantages of stainless steel in Roofing

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

4, 8 Famous Stainless Steel Monuments and Sculptures

We’ve picked 8 Famous Stainless Steel Monuments and Sculptures from around the world… Read More

5, Stainless Steel A 100% Recyclable Product

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

 

 

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Uginox Patina – Weathering

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:

  • Formation of a homogenous, matt grey finish (known as patina).
  • Gives a surface which promotes easy application of soft solder in complex details.

Patina formation

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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Stainless Steel World 2019 Conference & Expo

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This year’s event is set to break all previous attendance records and will offer networking opportunities that you simply cannot miss!

Walk around the exhibition hall and take in the products and personalities of more than 280 world-class companies showcasing their expertise to more than 6500 middle-to-higher management visitors.

At every exhibition stand experienced technical and sales staff will be on hand to update all on the availability of their company products and services and provide hands-on solutions to practical challenges.

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K44 Stainless Steel Characteristics

K44 18% chromium with molybdenum, titanium and niobium stabilized.

General characteristics

The principal features of our K44 grade are:

  • Very good resistance to pitting corrosion in chloride media, better than 304L (18-9L) and 316L (18-11ML) grades.
  • Insensitivity to stress cracking corrosion and intergranular corrosion.
  • Low toughness at transition temperature, even in welded zones.
  • good drawability.
  • good weldability.
  • thermal conductivity higher than that of austenitic grades, with a lower thermal expansion coefficient.

Applications

  • Hot water tanks
  • Boilers
  • Fume ducts
  • Heat exchangers
  • Sugar and sanitary tubes
  • Photovoltaic frames
  • Solar tanks
  • Solar panels
  • Cooking and catering equipment
  • Water tanks

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).

Chemical composition

For the full technical specification, please download the K44 data sheet.

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Stainless Steel A 100% Recyclable Product

Stainless steel is the “green material” par excellence and is infinitely recyclable. Within the construction sector, its actual recovery rate is close to 100%.

It is environmentally neutral, inert and when in contact with elements such as water it does not leach compounds that might modify their composition. These qualities make it a material which is ideally suited to building and construction applications: roofs, facades, rainwater recovery systems, domestic water pipes and swimming pools as well as bridges and pedestrian bridges.

Stainless steel’s longevity fulfils the requirements of sustainable construction. A suitable choice in terms of grade, surface finish, installation and maintenance guarantees the user unrivalled service life.

Construction components in stainless steel are delivered ready to install on site reducing pollution (noise, dust, etc.). Furthermore, during demolition, these can be salvaged for re-use in recycling, adding value.

Stainless Steel 100% recycled 

Today, the material flow for stainless products demonstrates that the recycling of pre- and post-consumer stainless steel scrap is already common practice.
In the production of stainless steel, a scrap blend and other raw materials – chromium, molybdenum, nickel and other elements – are melted together in an electric furnace before going into a converter for refining. The molten stainless steel is then cast into slabs or billets, before the production of plate, sheet, coil, wire or other product forms, in preparation for use by industrial manufacturers. These manufacturers produce the stainless steel items we use every day, including cutlery, pots & pans and kitchen sinks, and inumerable architectural, industrial and other components.

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Stainless Steel and Corrosion

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.

 

 

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What is UGINOX® Patina K44?

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 !

  • Chromium is a key chemical compound, which basically gives stainless steel its corrosion resistance property. Indeed a chromiumoxide is created on the material surface in contact with air and water. This layer repairs itself and therefore protects the surface.
  • Molybdenum reinforces its corrosion resistance.

Key strengths

  • Workable at low temperatures, including in mountainous regions.
  • Ease of soldering.
  • Low thermal expansion coefficient: enables the use of long sheet lengths in single sections.
  • High corrosion resistance, suitable for use in aggressiveatmospheres.
  • Nickel-free grade offering price stability over time.
  • 100% recyclable.

Applications

  • Standing seam roofing.
  • Self supporting roofing.
  • Cleated seam roofing.
  • Suitable for cold
  • Cold roof or warm roofs.
  • Gutters.
  • Roofing accessories.

 

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UGINOX Patina K44: Atmospheric exposure

UGINOX Patina K44 is naturally resistant to corrosion and suitable for any environment.*

Roofing:
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.

Vertical cladding:
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

  • Thickness: 0.5 mm
  • Maximum width: 1160 mm
  • Available in coil, slit coil and sheet

Recommendations

  • Use UGINOX Patina K44 for standing seam, self supporting and cleated seam roofing, as well as for accessories.
  • Avoid the use of UGINOX Patina K44 in vertical and sheltered areas.
  • Use dedicated tools to avoid any risk of cross contamination.
  • Do not work with other metals adjacent to UGINOX Patina K44, which could cause contamination as a result of projections.
  • Avoid the use of metallic pads or wire wool including powder based abrasives.
  • Before soldering use an orthophosphoric based acid for pickling. Use of chlorine based pickling agents is prohibited. We recommend immediate rinsing with water after soldering.

*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.

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Fully Supported Roofs: Standing Seam Roofs

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.

Strengths

  • Ideal for large flat surfaces that require the use of long strips.
  • Cost reduction by the use of longer pieces and low weight per m2.
  • Not fragile and no risk of fracturing at low temperatures.
  • Immaculate aesthetics.
  • Ideal technique for curved surfaces and complex shapes (domes, cones, etc.).

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.