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Metal coated SSAB Domex HSLA steels are designed for demanding structural applications that require galvanic corrosion protection and good formability in relation to high strength. Metal coated SSAB Domex HSLA steels are designated according to their minimum guaranteed yield strength from 220 to 500 MPa. Most of these steel grades comply with EN10346:2015 standard and exceed the standard requirements by better formability and more consistent properties, which increase the productivityin workshop thanks to the stable forming result. A low variation in mechanical properties makes them highly suitable for automated forming processes. Excellent combination of formability and strength can be utilized for example to increase the safety margin for overloading, to make more demanding forming without compromising load-bearing capacity or to decrease weight. In addition to normal zinc (Z), the offering contains Galfan (ZA) and Galvannealed (ZF) for enhanced level of corrosion protection. Galvanic corrosion protection of zinc-based coating ensures the long service life for the framework components, which is required by big installations like solar power plants or silos.
SSAB Domex 220LAD is available in thicknesses of 0.50-3.00 mm and widths up to 1520 mm as coils, slit coils and as cut to length in lengths up to 6 meters.
SSAB Domex 260LAD is available in thicknesses of 0.50-3.00 mm and widths up to 1520 mm as coils, slit coils and as cut to length in lengths up to 6 meters.
SSAB Domex 300LAD is available in thicknesses of 0.50-3.00 mm and widths up to 1520 mm as coils, slit coils and as cut to length in lengths up to 6 meters.
SSAB Domex 340LAD is available in thicknesses of 0.50-3.00 mm and widths up to 1520 mm as coils, slit coils and as cut to length in lengths up to 6 meters.
SSAB Domex 380LAD is available in thicknesses of 0.50-3.00 mm and widths up to 1520 mm as coils, slit coils and as cut to length in lengths up to 6 meters.
SSAB Domex 420LAD is available in thicknesses of 0.50-2.50 mm and widths up to 1500 mm as coils, slit coils and as cut to length in lengths up to 6 meters.
SSAB Domex 460LAD is available in thicknesses of 0.80-2.00 mm and widths up to 1500 mm as coils, slit coils and as cut to length in lengths up to 6 meters.
SSAB Domex 500LAD is available in thicknesses of 0.80-2.00 mm and widths up to 1410 mm as coils, slit coils and as cut to length in lengths up to 6 meters.
Available dimensions vary depending on coating.
1) If no pronounced yield point is present, the 0.2 % yield point value Rp0.2 is used. If the product has a pronounced yield point, the values apply for the lower yield point ReL.
2) Decreased minimum elongation A value for thickness 0.50mm < t ≤ 0.70mm (minus 2 units) and t ≤ 0.50mm (minus 4 units) apply. In addition, in case of ZF coating the minimum elongation A80 value is reduced by 2 units.
3) The limits apply to steel when bending angle is 90°. In some cases tight bending radius may cause micro-cracking of the coating in the bend area. Where design permits, users are encouraged to employ larger radius. t=thickness.
Content % by mass.
The tolerances of these metal coated Domex HSLA steels are in accordance with standard EN 10143:2006. If no special instructions are given on the order, the products are delivered with the normal tolerances of this standard. Special tolerances according to standard EN 10143:2006 or other tolerance specification can be agreed separately at the time of order.
Coatings
The metal coated products are offered with Zinc (Z), Galfan zinc-aluminium (ZA), or Galvannealed zinc-iron alloy(ZF) coating. The cathodic corrosion protection of these metal coatings is in direct proportion to its thickness, i.e. a thick coating will provide better corrosion protection for the underlying steel than a thin coating. However, thin coatings are recommended for applications with high formabilityrequirements.
Zinc
The Zinc (Z) coating has a composition consisting almost entirely of zinc (>99%) and is lead free, resulting in finely crystallized zinc spangle that meets high requirements for visual appearance. It is produced by hot-dip galvanizing process. Thanks to the good formability of lead-free coatings, the corrosion protection, for example, in areas which have been bent is good. The small spangle coating is designated bythe letter M.
Galfan
Galfan (ZA) is a zinc-aluminium alloy coating with the eutectic composition approximately of 95% Zn and 5% Al . This coating has better anticorrosive and forming properties than normal zinc coatings. Galfan coating can be recognized byits bright metallic and mildly cellular-patterned surface. It is produced by hot-dip coating process.
Galvannealed
Galvannealed (ZF) is a zinc-iron alloy coating having an iron content of about 10%. This coating is produced by heat-treatment after continuous hot-dip coating process. ZF coated steels are excellent for resistance welding applications and are designed for use in high-quality painted products. Galvannealed coating can be recognized byits typically grayish, matte surface.
*In triple spot test.
In addition to these coating thicknesses defined according to EN10346:2015, the offering contains different asymmetric coatings, coatings with equal coating minimum mass per surface, and other OEM specifications that are available upon request.
Imperfections such as pimples, marks, scratches, pits,variations in surface appearance, dark spots, stripe marks and light passivation stains are permissible. Stretch levelling breaks or run-off marks may appear. Coil breaks and stretcher strains may appear as well. A-surface is more shiny than B surface.
Surface quality B is obtained by skin passing. With this surface quality, small imperfections such as stretch levelling breaks, skin pass marks, slight scratches, surface structure, run-off marks and light passivation stains are permissible. Skin-passed B-surface has a matte appearance.
In order to prevent formation of white rust during transportation or storage, the following surface treatments are available:
Unless otherwise agreed, zinc and Galfan coated coils and sheets are delivered as chemically passivated. A thin passivation layer remains on the surface of the steel. The purpose of this is to protect the coating against the formation of white rust during transportation and storage. This treatment is not sufficient, however, for protection under all conditions.
If required, oiling can be used instead of chemical passivation. Metal coated products to be painted are recommended to be delivered in oiled condition and therefore Galvannealed coated coils are delivered as oiled, unless otherwise agreed. The temporary corrosion protection provided by oil is especially dependent on storage time, and therefore long storage times should be avoided with oiled products.
Both passivation and oiling are also available for maximum surface protection.
In unprotected condition, i.e. without surface treatment, there is a risk for formation of corrosion products and scratches during transportation, storage or handling. The products are supplied without surface treatment only if explicitly required by the customer on its own responsibility.
All surface treatments are in accordance with RoHS directive (2011/65/EU) and do not contain Chromium VI (Cr6+).
Surface treatments provide only temporary surface protection during transportation and storage. White rust tends to form easily on the surface of bright, newly coated coils or in the space between tightly packed sheets if condensed water or rainwater collects on the surface and is not able to evaporate away quickly. In order to avoid white rust, care must be taken to keep the coated products dry during transportation and storage. Condensation may form between laps or sheets due to, for example, daily temperature changes or when bringing cold products into a warm building. If they become wet and white rust begins to form, they must be separated and situated so that they are dried quickly. This will prevent any further formation of white rust.