Abstract
This paper provides the study of aging hot dip galvanized rolled products of low-carbon high-resistance automotive steels featuring good formability, weldability and dent-resistance. The authors carried out the experiment to obtain data on the period of warranty of mechanical properties of rolled products manufactured at OJSC Magnitogorsk Iron and Steel Works at storage and processing at the customer's site. The following assortment of hot-dip galvanized rolled products was selected for the experiment: 08ps and DX52D steels rolled coated products, rolled products of high-strength HX220YD and 006/IFgr steels as well as those of high-strength steels hardening at coating afterbaking – HX180BD and A341-A5. Tensile test was carried out at the experimental stage to determine changes of mechanical properties of the assortment under study due to aging. Based on the experimental outcome, the graphs were plotted, which clearly demonstrated changes of mechanical properties of rolled products due to aging. It has been found that the warranty period for mechanical properties of hot-dip galvanized rolled products of DX52D, HX220YD and 006/IFgr steels is 3 to 6 months since the confirmation of the delivery date; the storage period for hot-dip galvanized rolled products of HX180BD and A341-A5 steels shall be no more than 3 months. Aging 08ps steel hot-dip galvanized rolled products begins in as little as 10 days.
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