| 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 500C <=T1<=(Ts-20C) where Ts 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 (T1-60C)<=T2<= (T1-5C), and the rolling process is performed in such a way that the output final temperature T3 would be so that (T1-150C)<=T3<=(T1-30C) 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 200C<=T5<=300C. The rolling process is performed in such a way that the coiling temperature T6 would be so that (T5-150C)<=T6<=(T5-20C). ^ 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 |
