General Product Description
SSAB Weathering 355NL steel grade is normalized structural steel offering a good weather resistance. This steel has excellent usability properties. Its surface quality, dimensional accuracy and the consistency of its properties are among the best on the market. Thanks to its good properties, these steels promote environmentally sound construction and sustainable development.
SSAB Weathering 355NL brings clear performance benefits for heavy steel structures like bridges. Thanks to the excellent resistance to atmospheric corrosion, there is no need for the additional coatings, such as painting of steel structures. Therefore, a significant cost advantage can be achieved in applications, where a dark brown patina is desired on the steel surface. However, the steel surface can be shot blasted and painted, using the same methods as when painting ordinary steel grades. As a result of the special alloying of the steel, the lifespan of the painting is about double that of an ordinary steel grade painted.
The anti-corrosion properties of SSAB Weathering 355NL are much better than those of the ordinary structural steels which are commonly used in many outdoor applications. The enhanced weather resistance is based on the oxide layer, i.e. patina. The elegantly brown patinated surface is architecturally distinguished. Patina starts to be yellowish first and when the time goes on the color will turn to darker brown.
SSAB Weathering 355NL meets or exceeds the requirements of S355J5W+N in EN 10025-5. Dual certification and CE marking are available upon request.
Dimension Range
SSAB Weathering 355NL is available in thickness 5.0 - 100.0 mm.
Mechanical Properties
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The tensile test is made transverse to the rolling direction in compliance with EN 10025-1 and EN 10025-5.
Certificates:
SSAB Weathering 355NL provides two different certificates.
EN 10204-3.1 to SSAB Weathering 355NL and S355J5W+N.
Impact Properties
Charpy V 10x10 mm test specimens
Chemical Composition (heat analysis)
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Tolerances
Thickness ¾ from EN 10029 Class A. Width and length according to EN 10029.
Flatness 6 mm/m.
Surface according to EN 10163-2 Class A subclass 3.
Delivery Conditions
Normalized (N).
Possible to order as shot blasted & primed.
Fabrication and Other Recommendations
Welding:
The welding of SSAB Weathering NL steel is easy. All conventional welding methods can be used. If the welded structure shall be made according to the standard EN 1090-2 rules, the selection of acceptable welding consumables shall follow the standard EN 1090-2. Preheating shall be determined according to the standard EN 1011-2. Choosing of low hydrogen content welding consumables (HD ≤ 5 ml / 100 g) will minimize the risk of hydrogen cracking and reduce the need for preheating.
Forming up to 20 mm:
Minimum inner bending radius 2 x t can be used in both longitudinal and transverse direction in 90 degree three-point bending. Minimum die-width is recommended to be at least 10 x t. Close attention should be paid on the cut edges in the bend area and all excessive cracks or burrs should be removed. It is also important to be sure that the plate surface is defect free (no scratches) on the deformation area before bending.
Surface:
In order to achieve even good looking patina layer scale removal is recommended. That can be done either with pickling or shot blasting.
For information concerning fabrication, see SSAB´s brochures on www.ssab.com or consult Tech Support.
Appropriate health and safety precautions must be taken when bending, welding, cutting, grinding or otherwise working on the products.