Study On Key Techniques Of Stranded Wire Processing

Stranded steel wire is a kind of materials which is fabricated by means of drawing steel wire at home temperature to the stranded wire with diameter of 5.2mm and/or less than it, followed by stranded the steel wire. According to the surface condition, stranded wire could be divided into two main type, i.e., smooth stranded wire and galvanizing stranded wires. Zinc gavanizing wire is one can of the latter which is mainly used in powder transportation industry, telecommunication etc.The mainly properties required of this materials are high strength and good corrosion-resistance. Based on detailed investigation, Bayi iron and steel making company decided to build up stranded steel wire production line, with output of 7000 tons per year and, specifications for diameter Φ3.80mm 1x7 to Φ5.40-Φ9.60mm. The processing is: continuous casting-high speed wire rod-drawing- galvaniziedzinc-wire stranding.The present article describes the investigation of key factors which influenced the quanlity and properties of the stranded wire of Bayi Iron and Steel making Corporation Lirnited,emphersis is put on the following steps: drawing techniques, galvanizing and stranding techniques. The main factors which influenced the properties of stranded wire are condition of raw materials, total compressed ratio, step compressed ratio and galvanizing temperature.By comparing the wire rod of Shoudu company and Bayi company, we decided the composition of the latter should be like this: 0.62~0.70%C, 0.17~0.37%Si, 0.5-0.8%Mn, less than 0.04%P, less than 0.04%S, drawing parameters: total drawing ratio 70-80%, step ratio 10-30%, galvanizingtemperature 440-470℃.After applied the improved drawing techniques and optimizing galvanizing method, and co-operated with hot online try, the resultant stranded wire production line is in good condition, the production ability reached 7000t/a. Furthermore,the products shown good mechanical properties and size parameters which could be satisfactory the user requriments and passed the certification standards of the nation.All these presented that the improved techniques are well-workable.