FABRICATION METHOD OF STRIPS AND SHEETS MADE OF ZN-CU-TI ALLOYS DESIGNED FOR BUILDING INDUSTRY

摘要

A fabrication method of flat-rolled products designed for building industry, made of Zn-Cu-Ti alloy with a chemical composition in accordance with EN-988 standard, composed of at least two basic steps - continuous casting process of metal strip and non-integrated rolling process of finished product in form of sheets, wherein after casting step the metal strip with a thickness from 4 mm to 16 mm and width from 500 mm to 2000 mm is heated up to a temperature ranging from 240°C to 270°C before starting the rolling operation and is being rolled in at least five roll passes until the finished product is obtained. The reduction ratios in the last four roll passes of the rolling process are 40 % and 50 % and the rolling rate is not less than 100 mm/min. The sheet temperature following the last roll pass amounts to at least 100 °c (≥ 100 °C).;The Zn-Cu-Ti contains from 0,08 wt. % to 0,24 wt. % Cu, from 0,06 wt. % to 0,12 wt. % Ti, not more than 0,015 wt. % Al and rest Zn and tramp elements such as Cd, Fe, Pb and Sn.;The finished product is susceptible to plastic strain in low temperatures ≥ +10 °C.