What Is Galvanized Steel Wire?

Galvanized steel wire is made by drawing 45 #, 65 #, 70 # and other high-quality carbon structural steels, and then galvanizing (galvanizing or hot-dip galvanizing).

The surface of galvanized steel wire is smooth, smooth, without cracks, knots, thorns, scars and rust. The galvanized layer is uniform, strong adhesion, long-lasting corrosion resistance, excellent toughness and elasticity. The tensile strength should be between 900Mpa-2200Mpa (wire diameter 0.2mm-4.4mm). The number of twists (0.5mm) is more than 20 times, and the repeated bending should be more than 13 times.

The thickness of the hot-dip zinc layer is 250 g / m. Greatly improved the corrosion resistance of the wire ^[2]

Galvanized steel wire is mainly used for planting greenhouses, farms, cotton packing, springs and

The uniformity of the zinc layer affects the corrosion resistance and service life of the product, and it should be included in the standard for testing and assessment. The uniformity of the coating can be evaluated by using the coating uniformity or the average thickness H of the coating and the standard deviation S. Necessary measures should be taken in the process of hot-dip galvanizing to improve the uniformity of the galvanized layer ^[3]

First plating and then drawing process: In order to improve the performance of galvanized steel wire, the process of using steel wire to be subjected to lead annealing, galvanizing and then drawing to the finished product is called the first plating and then drawing process. The typical process is: steel wire-lead quenching-galvanizing-drawing-finished steel wire. The process of plating first and then drawing is the shortest process in the method of drawing galvanized steel wire. It can be used for hot-dip galvanizing or galvanizing and drawing. After hot-dip galvanizing, the mechanical properties are better than that of the first-plated steel wire. After galvanizing, the zinc layer is dense and resistant. Both can obtain a thin and uniform zinc layer, reduce zinc consumption, and reduce the load on the galvanizing line.

Drawing process after middle plating : The drawing process after middle plating is: steel wire-lead quenching-primary drawing-galvanized-secondary drawing-finished steel wire. The feature of drawing after medium plating is that the lead-hardened steel wire is galvanized once and then drawn twice to the finished product. The galvanization is between the two drawing, so it is called 'medium plating.' The steel wire zinc layer produced by middle-plating and later-drawing is thicker than that of first-plating and then-drawing. Hot-dip galvanizing and drawing after plating can give a high total compression ratio (from lead quenching to finished product), which is better than steel wire that is plated and then drawn.

Mixed plating and drawing process: In order to produce ultra-high strength (3000 N / mm2) galvanized steel wire, a "mixed plating and drawing" process is used. The typical process is as follows: lead quenchingone-drawpre-galvanizedtwo-drawnfinal galvanizedthree-drawn (dry drawing) water tank drawing a finished steel wire. The above process can produce an ultra-high-strength galvanized steel wire containing 0.93 to 0.97% carbon, a diameter of 0.26 mm, and a strength of 3921 N / mm2. The zinc layer protects and lubricates the surface of the steel wire during drawing, and no wire breakage occurs during drawing ^[4] .