SIMPLIFIED METHOD OF ROLLED PRODUCTS MANUFACTURE OF Al-Zn-Mg ALLOYS, AND PRODUCTS MANUFACTURED USING THIS METHOD

摘要

FIELD: metallurgy.;SUBSTANCE: said utility invention relates to Al-Zn-Mg alloys, namely, to alloys for welded structures, such as structures used in marine construction, during manufacture of car and industrial vehicle bodies, and stationary or movable tanks. The method involves manufacture of a plate using semi-continuous casting. The plate is made of an alloy containing, % weight: Mg 0.5-2.0, Mn 1.0, Zn 3.0-9.0, Si 0.50, Fe 0.50, Cu 0.50, Ti 0.15, Zr 0.20, Cr 0.50, aluminium with its inevitable impurities being the remaining, Zn/Mg 1.7. After that, the plate is subjected to homogenisation and/or reheating at a temperature T₁ selected so that 500°C ≤T₁≤(T_s-20°C) where T_s is the alloy burning temperature. The first hot rolling stage includes one or several rolling passes on a hot-rolling mill, the input temperature T₂ is selected so that (T₁-60°C)≤T₂≤ (T₁-5°C), and the rolling process is performed in such a way that the output final temperature T₃ would be so that (T₁-150°C)≤T₃≤(T₁-30°C) and T₃ T₂. The strip produced at the said first hot rolling stage is rapidly cooled to the temperature T₄. The second stage of hot rolling of the said strip is performed at the input temperature T₅ selected so that T₅≤T₄ and 200°C≤T₅≤300°C. The rolling process is performed in such a way that the coiling temperature T₆ would be so that (T₅-150°C)≤T₆≤(T₅-20°C).;EFFECT: enhancement of balance between mechanical properties and corrosion resistance of base metal and welded joint using simplest and most reliable method.;34 cl, 8 dwg, 20 tbl, 10 ex