Specification of GI Steel Wire
| Nominal
Diameter mm |
Dia. Tolerance
mm |
Min. Mass of
Zinc Coating gr/ m² |
Elongation at
250mm gauge % min |
Tensile
Strength N/mm² |
Resistance
Ω/km max |
| 0.80 | ± 0.035 | 145 | 10 | 340-500 | 226 |
| 0.90 | ± 0.035 | 155 | 10 | 340-500 | 216.92 |
| 1.25 | ± 0.040 | 180 | 10 | 340-500 | 112.45 |
| 1.60 | ± 0.045 | 205 | 10 | 340-500 | 68.64 |
| 2.00 | ± 0.050 | 215 | 10 | 340-500 | 43.93 |
| 2.50 | ± 0.060 | 245 | 10 | 340-500 | 28.11 |
| 3.15 | ± 0.070 | 255 | 10 | 340-500 | 17.71 |
| 4.00 | ± 0.070 | 275 | 10 | 340-500 | 10.98 |
Drawing Process of Galvanized Steel Wire
l Galvanizing before drawing process: in order to improve the performance of galvanized steel wire, the process of drawing steel wire to the finished product after lead annealing and galvanizing is called plating before drawing process. The typical process flow is: steel wire - lead quenching - galvanizing - drawing - finished steel wire. The process of first plating and then drawing is the shortest process in the drawing method of galvanized steel wire, which can be used for hot galvanizing or electrogalvanizing and then drawing. The mechanical properties of hot dip galvanized steel wire after drawing are better than that of steel wire after drawing. Both can obtain thin and uniform zinc layer, reduce zinc consumption and lighten the load of galvanizing line.
l Intermediate galvanizing post drawing process: the intermediate galvanizing post drawing process is: steel wire - lead quenching - primary drawing - galvanizing - secondary drawing - finished steel wire. The feature of medium plating after drawing is that the lead quenched steel wire is galvanized after one drawing and then is drawn to the finished product twice. The galvanizing is between the two drawing, so it is called medium plating,. The zinc layer of steel wire produced by medium plating and then drawing is thicker than that produced by plating and then drawing. The total compressibility (from lead quenching to finished products) of hot dip galvanized steel wire after plating and drawing is higher than that of steel wire after plating and drawing.
l Mixed galvanizing process: to produce ultra-high strength (3000 N/mm2) galvanized steel wire, "mixed galvanizing and drawing" process shall be adopted. The typical process flow is as follows: lead quenching - primary drawing - pre galvanizing - secondary drawing - final galvanizing - tertiary drawing (dry drawing) - water tank drawing a finished steel wire. The above process can produce ultra-high strength galvanized steel wire with carbon content of 0.93-0.97%, diameter of 0.26mm and strength of 3921N/mm2. The zinc layer plays a role in protecting and lubricating the surface of the steel wire during drawing, and the wire is not broken during drawing.
