Production trial of high strength galvanized steel wire for cotton packaging

The property requirements of wire rod for high strength galvanized wire and finished wire for cotton packaging are pointed out. The trial production process of high strength galvanized wire for cotten packaging is introduced. Mass fraction from 15% to 20% hydrochloric acid normal temperature cleaning,middle temperature phosphating are adoped in 65 steel wire rod surface treatment. The thickness of phosphating film is larger than 9 μm. To adopt LT-9/560 heavy wet wire drawing machine,partial compressibility is from 16% to 20%,total compressibility is 73.4%. Semi-finished annealing temperature is at 715～730 ℃,holding time is about 124 s. The pH value of galvanized liquid is controlled from 2 to 4. Current density is from 13 to 30 A/dm2. Zn-coat mass is larger than 25 g/m2. The mechanical properties of finished wire measure up the requirements of YB/T 5033—2001 galvanized steel wire for cotton packaging B grade.