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Racks require steels with high mechanical properties and a good formability. Depending on the application and the corrosion exposition, they can be produced from high strength hot rolled Amstrong® steel suitable for galvanising or from pregalvanised High Strength Low Alloy (HSLA) steels preferentially with Zinc-Magnesium coating.
Amstrong® high strength steels are thermomechanically hot rolled, cold formable grades. Their main properties include high yield strength (up to 600 MPa) and tensile strength, combined with excellent formability, toughness and fatigue resistance. These grades are therefore an excellent choice for reducing structural thickness and weight of racks whilst improving load-bearing capacity, thereby generating cost savings and securing market advantage.
Concerning precoated steels, HX460LAD+ZM or HX500LAD+ZM are our HSLA grades recommended for this application, in combination with Magnelis® coating, a zinc-aluminium-magnesium alloy.
HSLA are characterised by their low content of both carbon and micro-alloying elements which gives them outstanding functional properties, such as excellent mechanical strength, weldability and coatability. HSLA steels combine improved weldability with good formability. The narrow variation margins for their mechanical properties make it easy to hape the steel (press bending or profiling). They also have good fatigue and impact resistance.
Magnelis® coating chemical composition of 93.5% zinc, 3.5% aluminium and 3% magnesium has been selected to provide the best results in terms of corrosion resistance up to 10 times better than galvanised steels and also offers self-healing on cut edges. The zinc-rich metallic coating composition permits all the conventional processing operations possible with standard hot dip galvanised steel: bending, drawing, clinching, profiling, stamping, welding etc. The friction coefficient of Magnelis® coated steel is lower than the one of standard hot dip galvanised steel and stable during forming operations.
