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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 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.

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Why stainless steel is the ideal choice for roofing and cladding

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…

  • Lighter envelope, thanks to high mechanical properties that permit a reduction of thickness.
  • Compatible with all types of support: metal, all types of wood, etc.
  • Possible association with construction systems giving thermal properties and/or acoustics.
  • Response to national and European thermal regulatory requirements.
  • More cost-effective than traditional products and techniques.
  • All types of claddings are possible, both new and refurbished.
  • In refurbishment, the stainless steel envelope transforms and modernises the building while respecting thermal regulations and omitting thermal bridges.
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Stainless steel, a combination of performance and aesthetics for your projects

Design

Our wide range of grades and surface finishes will let you choose stainless steel that will provide your building with continuity and sustainability thanks to corrosion resistance that is adapted to any given atmospheric environment. Furthermore, our various stainless steels have excellent physical properties even at very low temperatures. On one hand, this allows you to use thinner pieces, providing for a lower weight per m2, and on the other hand, you can use very long pieces in single sections.

Our products are transformed and easily installed using traditional tools and machinery.

Economic performance

Designing and building with stainless steel contributes to an excellent overall cost, that is a positive relationship between the final cost and the lifetime of the work. This comes as a result of the exceptional durability of stainless steel buildings, and the almost non-existent, easy maintenance.

The price stability, especially with our ferritic grades, as well as the cost of transformation and installation is comparable to other traditionally used metals, giving stainless steel its competitiveness.

Aesthetics

Stainless steel offers creative freedom and architectural design which is rarely matched. Our impressive range of thicknesses and wide range of surface finishes – from the more dull to the colourful to the most brilliant.

Stainless steel allows for the creation of complex shapes and pairs well with other materials such as glass, wood, stone, etc.

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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 stabilized 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 chromium oxide 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 aggressive atmospheres.
  • 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.