1. High calcium absorption.
Seamless calcium metal line has a thicker outer steel shell (mm), which can feed calcium into deeper parts of the molten steel and stay below the critical depth for a longer period of time, so as to achieve a higher calcium recovery rate. Seamless metal calcium line and the use of sewn calcium line effect shows that in order to ensure the same calcium content of molten steel, seamless metal calcium line than sewn calcium line feeding line length (metres) by an average of 54%, the weight of the feeding line is only 1/4 of the sewn calcium line; the use of seamless metal calcium line than the billet sewn line of calcium absorption rate increased by about 20%.
2. the calcium increase of steel is stable.
Calcium iron line and silicon calcium line core material for calcium-containing powder, easy to core material uneven and hollow phenomenon, while the solid core of pure calcium line core material for high-density pure calcium core bar, per metre of calcium content is higher, more uniform, more stable, to ensure that the effect of calcium treatment is more stable for the complete denaturation of steel Al2O3 inclusions to provide a guarantee to reduce the chances of blocking of water mouths of continuous casting steel. More favourable to pure steel production. Solid core pure calcium line has a high density pure calcium core rod, the quality is easy to test, smaller specific surface area of the core line, it is not easy to oxidise and lose activity, so that it has a longer preservation period, can be contaminated with molten steel calcium oxide inclusions to a minimum; solid core pure calcium line calcium treatment process will not be brought into the presence of other oxides in the powder core line to contaminate the molten steel (such as calcium iron wire iron oxide); solid core pure calcium line compared with the traditional powder-filled package line Solid core pure calcium line than the traditional powder-filled core line can further reduce the consumption of calcium per tonne of steel, reduce molten steel pollution.
3.Reduce working intensity.
Calcium iron wire and calcium silicon wire is powder filled, the core material is uneven and hollow phenomenon is more, the feeding process often breaks the line and jam line situation, the steel production caused by a certain impact, solid core pure calcium wire is wrapped in thick steel shell of high-density solid core pure calcium rods, the line quality is hard, feeding line does not slip, does not run out of shape, the operation is very smooth. In addition, solid core pure calcium wire single disc line length than calcium iron line is about 1 times longer, but the amount of only about 1/2 of the length of the calcium iron line, a single disc of solid core pure calcium line is 4 times the number of furnaces used in the calcium iron line. Therefore, the use of solid core pure calcium wire not only feed line operation is very smooth, and the number of threading is greatly reduced, the intensity of the work of the workers is significantly reduced.
4.effectively reduce costs.
Aluminium content, oxygen content and inclusions of different steel are different, calcium treatment of molten steel core wire consumption is also a big difference, but the use of solid core pure calcium wire consumption is basically for the consumption of calcium iron wire (kg / t) of 1/3 ~ 1/4 At present, the price of solid core pure calcium wire is about 1 times the calcium iron wire. Therefore, under the condition that the average amount of calcium increase is basically the same, the cost of using solid core pure calcium wire for molten steel calcium treatment can be reduced by 30%~50%, which is a very obvious advantage.
