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The 2 converter steelmaking
- raw material conditions, the purity and quality stability of hot metal are superior to those of scrap;
- with hot metal pretreatment, further improve the purity of molten iron;
- end-point carbon control level is high, the reaction tends to be more balanced than electric furnace steel slag;
- converter steel, low gas content;
- furnace refining and continuous casting and technological level and the furnace is quite.
- Japan and Germany adopts different production process, the difference between control -- Steelmaking Endpoint carbon;
- Japan -- "three off" pretreatment, little slag smelting high carbon steel production technology, low phosphorus and low oxygen steel;
- Germany - pull converter of low carbon technology, ensure the converter dephosphorization effect on later, tapping is the production of bearing steel carburetion.
- hot metal pretreatment: magnesium base desulfurizing agent processing, hot metal w[S] is less than or equal to 0.005%, 100% after treatment the slag skimming;
- converter smelting: by catching carbon method, end-point carbon w[C] is less than or equal to 0.40%, while the control of w[P] is less than or equal to 0.010%. Scrap are matched in Al Mn Ti temperature raising agent -- supplemental end high carbon control temperature is not; the tapping temperature of 1700 DEG C, the carbon content of 0.34%, 0.007% of phosphorus content;
- tapping process of alloying and carbon with high Cr alloy, Si-Mn alloy, carbon powder in the bag, and slag operation, with stirring removal of total oxygen in molten steel argon bottom blowing;
LF refining using low basicity CaO-Al2O3 slag system, desulfurization rate of 50%-70%, reduce the Al inclusions; have the same components and deoxidation product, interfacial tension of the two small, easy to combine to form low melting point compounds, strong absorption ability of Al2O3 inclusions, the elimination of CaO containing D inclusions. At the same time, bottom blowing argon uniform composition, temperature;
- blowing argon stirring: according to the analysis of weak reference sample composition, added high chromium, high manganese and carbon powder composition is adjusted to meet the requirements of internal control, blowing argon stirring inclusions floating in the weak - further temperature higher than the temperature of 20-30 DEG C when the hanging bag;