Indaten® 355HA

Alternative and trade names
Ensacor® A
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Description

Indaten® 355H meets the requirements of the reference standard and has been further optimised to give extremely high processing and in-service performance.

When used uncoated and exposed to bad weather, an oxide layer develops on the steel surface, forming a purplish-brown, finely grained patina that bonds very strongly to the steel and protects it. With their characteristic colour, steels with improved atmospheric corrosion resistance are used in architectural projects either to harmonise with the environment or to create a pleasing contrast with other materials, such as stainless steel. If the patina is damaged, the steel re-oxidises, thus repairing the patina and maintaining the protective barrier.

Steel with improved atmospheric corrosion resistance can also be coated (paint, metallic coatings etc).

Experience has shown that organic coatings adhere better to this steel than to other steel grades.

Related Standards

Equivalent Materials

This material data has been provided by ArcelorMittal.

"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

Ashby charts

Properties

Mechanical

PropertyTemperatureValueComment

Charpy impact energy

0 °C

27 J

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min. | for thickness 5-12 mm

Elongation

20 %

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min. A5.65√So | for thickness 5-12 mm | Transverse

22 %

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min. A5.65√So | for thickness 5-12 mm

Tensile strength

490 - 630 MPa

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for thickness 5-12 mm | Transverse

Yield strength

355 MPa

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min. | for thickness 5-12 mm | Transverse

Chemical properties

PropertyValueComment

Aluminium

0.02 %

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min.

Chromium

0.3 - 1.25 %

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Copper

0.25 - 0.55 %

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Nickel

0.65 %

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max.

Niobium

0.015 - 0.06 %

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Vanadium

0.02 - 0.25 %

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Technological properties

Property
Application areas

Steel with improved atmospheric corrosion resistance have a wide range of applications: architecture, smokestacks, freight wagons, silos, pylons and bridges.

Since 1 July 2013, the Construction Products Regulation (Regulation (EU) No. 305/2011 – CPR) has required that CE marking be affixed to all products delivered in accordance with a harmonised standard (e.g. EN 10025). This CE marking guarantees, for the uses defined in the standard, the properties described in the declaration of performance submitted by the manufacturer.

The corresponding declarations of performance are available on our website at: http://dop.arcelormittal.net/index.php

The efficiency of the corrosion protection largely depends on the speed of patina formation.

For optimum patina formation:

  • This steel can be used in a non-confined environment, even in the presence of sulphuric fumes. However, it is strongly recommended not to expose them to condensation or repeated soiling, particularly in environments containing free chlorine
  • This steel can be painted. If the paint is damaged, a protective oxide layer forms and prevents the spread of rust.

    Steel with improved atmospheric corrosion resistance have excellent weldability with all the usual welding processes because of their low carbon content and fine-grained structure

  • Delivery condtion

    For the dimensions available please visit Dimension tables (see Table A).

    Other

    Recommendations for use


    Attractive appearance of the patina

    Outdoor use: the patina forms naturally in the open air (over a period of three to four years). Variations in appearance will be observed, depending on the conditions it is exposed to: condensation, evacuation and evaporation of water. After a few years, the patina will stabilise, even in an industrial, sulphur-containing or rural environment. To ensure optimum patina formation, the oxidation process can be accelerated artificially by first descaling the surface (by sandblasting or shotblasting) and then subjecting it to alternate periods of dry and humid conditions.

    Indoor use: to preserve the natural appearance of the material and at the same time avoid powdery oxide deposits that may cause staining, the following three steps are recommended:

  • First remove all dusty deposits, stains or surface defects, then apply a chemical treatment to those areas where corrosion has not yet developed
  • Clean the surface with water, brush and dry
  • Finally, apply a colourless, matt, UV-resistant varnish

    Use painted: as the surface has a high reactivity, it is recommended that the first coat of paint be applied on a clean surface immediately after shotblasting or sandblasting.


    Available options

    Options available (after previous agreement):

  • Certified reduced carbon equivalent value
  • Guaranteed suitability for cold forming
  • Other options specified in the standard