For a long time, the alloys used in the converter had not been adjusted. The traditional alloy structure is relatively simple, namely Q195 and Q235 steel using Mnsi+FeSi+SiAiCaBa+Sic+ carburizing process, HRB335 and HRB400 steel using Mnsi+FeSi+AiSi+ carburizing process. The traditional silicon manganese alloy, due to the increasing scarcity of ferrosilicon resources and the rising market price, has gradually increased the cost of converter steelmaking and reduced the profit margin of steel products. In addition, the recovery rate of conventional alloys is greatly affected by converter operation. The amount of steel output, terminal temperature and slag drop make the alloy composition fluctuate greatly. Therefore, the chemical composition of steel is unstable, and the qualified rate of finished internal control index is low.
With the emergence of high-carbon silicon, more and more steel mills began to use high-carbon silicon. Typically, the rated size is 10-100mm (90%) or 10-60mm (90%).
The rated content is two kinds:
1. Silicon: 65% minimum, carbon: 15% minimum,
2. Silicon: 68% minimum, carbon 18% minimum.
Before the molten steel is poured into the converter, high-carbon silicon can be added to the bottom of the converter to ensure fuller and faster melting.
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