Indaten^® 355 is a range of steels with improved resistance to atmospheric corrosion that meet the requirements of the EN 10025-5:2004 standard. These grades are fine-grain, high-strength structural steels that have been optimised to give improved processing and in-service performance.

The grades as per EN 10025-5 can be supplied:

• Without any special rolling and/or heat treatment requirements. The abbreviated designation of this delivery condition is +AR.
• Following a rolling process in which final forming is carried out within a certain temperature range, producing a material in a condition equivalent to that obtained after normalising, with the result that the specified mechanical properties values are conserved even after normalising treatment. The abbreviated designation of this delivery condition is +N.

Furthermore, option 11c of EN 10025-5 is also available (sheet, plate, strip, wide flats and flats (width < 150 mm) with a nominal thickness ≤ 20 mm shall be suitable for flanging without cracking).

With their characteristic colour, Indaten^® 355 steels are used in architectural projects either to harmonise with the environment or to create a pleasing contrast with other materials, such as stainless steel. 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. If the patina is damaged, the steel re-oxidises, thus repairing the patina and maintaining the protective barrier. Indaten^® 355 can also be coated (paint, metallic coatings etc). In the case of coated parts, the protective layer prevents rust propagation under the paint layer.

Experience has shown that the adhesion of organic coatings on Indaten^® 355 is superior to bonding on other carbon steel grades.

Indaten^® 355 has a wide range of applications: architecture, sculpture, engineering structures, smokestacks, freight wagons, silos, containers and pylons. When used uncoated, no maintenance is required and the material will not deteriorate through corrosion.

The effectiveness of the corrosion protection largely depends on the speed of patina formation. For optimum patina formation, Indaten^® 355 can be used in a non-confined environment, even in the presence of sulphuric fumes. However, it is strongly recommended not to expose Indaten^® 355 to condensation or repeated soiling, particularly in environments containing free chlorine.

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.

All of the steels in this data sheet comply with this Regulation.

The corresponding declarations of performance are available on our website at:

http://dop.arcelormittal.net/index.php

Indaten^® 355 has excellent weldability with all the usual welding processes thanks to its low carbon content and fine-grained structure.

Shielded metal arc welding (process no. 111, SMAW)

* Specific electrode

** Specially adapted electrode

Submerged arc welding (process no. 21, SAW)

The filler materials to be used are the same as those recommended for welding steels with the same mechanical properties. As SAW involves strong inherent dilution, the welds will develop a patina.
The mechanical properties obtained in fusion zones meet the normal mechanical property requirements for the base metal.

* Specific welding wire/flux couple

** Specially adapted welding wire/flux couple

Gas metal-arc welding (process no. 135, GMAW)

The thin wires used for equivalent carbon steel grades can also be used for Indaten^® 355 steels; copper-plated wires deposit more copper on the surface of the welded zone, which contributes to the development of a patina on the welds. The cored wires to be used are also the same as those used for the equivalent carbon-manganese steel grades.

* Specific welding wire

** Specially adapted welding wire

Flux-cored arc welding (process no. 136, FCAW)

The process is suitable for the assembly of thin products with the same welding parameters recommended for equivalent carbon-manganese steel grades. If a filler wire is used, it must be of the same type as the base metal.

* Specific welding wire

** Specially adapted welding wire

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 water condensation, evacuation and evaporation conditions. After a few years, the patina will stabilise, even in an industrial, sulphur-containing or rural environment. To ensure optimum patina formation and limit the formation of rust streaks, 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 pickling or sandblasting.

The presence of copper in the oxide layer contributes to the formation of a strongly bonded, elastic and compact patina on the surface of Indaten^® 355 in the course of the corrosion process. The chromium and nickel contribute to the formation of insoluble alkaline sulphates, which will seal the pores of the oxide layer, thereby protecting the metal from water and oxygen. Silicon, and to a lesser extent phosphorus, also has a favourable effect on corrosion resistance.

Corrosion in a salt spray atmosphere (according to ASTM B117)

Tests were conducted in a chamber at a temperature of 35°C, in a humid atmosphere with a 5% concentration of NaCl. Weight loss was measured after 1000 hours. The sample was weighed before and after the test, and the rust was removed with an acid solution.

Atmospheric corrosion 

The samples were exposed to an industrial, marine atmosphere for 12 months.

Mill finish

Full table

Thickness (mm)	Min width	S235J0W EN 10025-5, S235J2W EN 10025-5	S355J0W EN 10025-5, S355J2W EN 10025-5, Indaten® 355D	S355J0WP EN 10025-5, Indaten® 355A, S355J2WP EN 10025-5
		Max width	Max width	Max width
1.50 ≤ th < 2.00	900	-	1250	1250
2.00 ≤ th < 2.50		1400		1400
2.50 ≤ th < 3.00		1750	1540	1540
3.00 ≤ th < 3.50		2050	1700	1700
3.50 ≤ th < 4.50			1900	1780
4.50 ≤ th < 5.00			2050	1900
5.00 ≤ th < 5.50			2130	1990
5.50 ≤ th < 9.50				2130
9.50 ≤ th < 10.00			2050
10.00 ≤ th < 12.00				2030
12.00 ≤ th < 13.00			1930
13.00 ≤ th < 16.00				1930
16.00 ≤ th < 20.00		-	1780	1780

Product can also be supplied pickled on request.

S235J0W EN 10025-5

S235J0W EN 10025-5

Thickness (mm)	Min width	Max width
1.50 ≤ th < 2.00	-	-
2.00 ≤ th < 2.50	900	1400
2.50 ≤ th < 3.00		1750
3.00 ≤ th < 3.50		2050
3.50 ≤ th < 4.50
4.50 ≤ th < 5.00
5.00 ≤ th < 5.50
5.50 ≤ th < 9.50
9.50 ≤ th < 10.00
10.00 ≤ th < 12.00
12.00 ≤ th < 13.00
13.00 ≤ th < 16.00
16.00 ≤ th < 20.00	-	-

S235J2W EN 10025-5

S235J2W EN 10025-5

Thickness (mm)	Min width	Max width
1.50 ≤ th < 2.00	-	-
2.00 ≤ th < 2.50	900	1400
2.50 ≤ th < 3.00		1750
3.00 ≤ th < 3.50		2050
3.50 ≤ th < 4.50
4.50 ≤ th < 5.00
5.00 ≤ th < 5.50
5.50 ≤ th < 9.50
9.50 ≤ th < 10.00
10.00 ≤ th < 12.00
12.00 ≤ th < 13.00
13.00 ≤ th < 16.00
16.00 ≤ th < 20.00	-	-

S355J0W EN 10025-5

S355J0W EN 10025-5

Thickness (mm)	Min width	Max width
1.50 ≤ th < 2.00	900	1250
2.00 ≤ th < 2.50
2.50 ≤ th < 3.00		1540
3.00 ≤ th < 3.50		1700
3.50 ≤ th < 4.50		1900
4.50 ≤ th < 5.00		2050
5.00 ≤ th < 5.50		2130
5.50 ≤ th < 9.50
9.50 ≤ th < 10.00		2050
10.00 ≤ th < 12.00
12.00 ≤ th < 13.00		1930
13.00 ≤ th < 16.00
16.00 ≤ th < 20.00		1780

S355J0WP EN 10025-5

S355J0WP EN 10025-5

Thickness (mm)	Min width	Max width
1.50 ≤ th < 2.00	900	1250
2.00 ≤ th < 2.50		1400
2.50 ≤ th < 3.00		1540
3.00 ≤ th < 3.50		1700
3.50 ≤ th < 4.50		1780
4.50 ≤ th < 5.00		1900
5.00 ≤ th < 5.50		1990
5.50 ≤ th < 9.50		2130
9.50 ≤ th < 10.00
10.00 ≤ th < 12.00		2030
12.00 ≤ th < 13.00
13.00 ≤ th < 16.00		1930
16.00 ≤ th < 20.00		1780

Indaten^® 355A

Indaten^® 355A

Thickness (mm)	Min width	Max width
1.50 ≤ th < 2.00	900	1250
2.00 ≤ th < 2.50		1400
2.50 ≤ th < 3.00		1540
3.00 ≤ th < 3.50		1700
3.50 ≤ th < 4.50		1780
4.50 ≤ th < 5.00		1900
5.00 ≤ th < 5.50		1990
5.50 ≤ th < 9.50		2130
9.50 ≤ th < 10.00
10.00 ≤ th < 12.00		2030
12.00 ≤ th < 13.00
13.00 ≤ th < 16.00		1930
16.00 ≤ th < 20.00		1780

S355J2W EN 10025-5

S355J2W EN 10025-5

Thickness (mm)	Min width	Max width
1.50 ≤ th < 2.00	900	1250
2.00 ≤ th < 2.50
2.50 ≤ th < 3.00		1540
3.00 ≤ th < 3.50		1700
3.50 ≤ th < 4.50		1900
4.50 ≤ th < 5.00		2050
5.00 ≤ th < 5.50		2130
5.50 ≤ th < 9.50
9.50 ≤ th < 10.00		2050
10.00 ≤ th < 12.00
12.00 ≤ th < 13.00		1930
13.00 ≤ th < 16.00
16.00 ≤ th < 20.00		1780

Indaten^® 355D

Indaten^® 355D

Thickness (mm)	Min width	Max width
1.50 ≤ th < 2.00	900	1250
2.00 ≤ th < 2.50
2.50 ≤ th < 3.00		1540
3.00 ≤ th < 3.50		1700
3.50 ≤ th < 4.50		1900
4.50 ≤ th < 5.00		2050
5.00 ≤ th < 5.50		2130
5.50 ≤ th < 9.50
9.50 ≤ th < 10.00		2050
10.00 ≤ th < 12.00
12.00 ≤ th < 13.00		1930
13.00 ≤ th < 16.00
16.00 ≤ th < 20.00		1780

S355J2WP EN 10025-5

S355J2WP EN 10025-5

Thickness (mm)	Min width	Max width
1.50 ≤ th < 2.00	900	1250
2.00 ≤ th < 2.50		1400
2.50 ≤ th < 3.00		1540
3.00 ≤ th < 3.50		1700
3.50 ≤ th < 4.50		1780
4.50 ≤ th < 5.00		1900
5.00 ≤ th < 5.50		1990
5.50 ≤ th < 9.50		2130
9.50 ≤ th < 10.00
10.00 ≤ th < 12.00		2030
12.00 ≤ th < 13.00
13.00 ≤ th < 16.00		1930
16.00 ≤ th < 20.00		1780

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Product can also be supplied pickled on request.