After the molten steel arrives at the station, add lime 2kg/t steel and 75 silicon carbide 0.2Kg/t steel after 3 ~ 5min of slag supply, the flow rate of argon gas blowing at the bottom of the ladle during slag melting process is 300 ~ 400Nl/min, sampling and analysis;
According to the composition of the first steel sample in LF furnace and the viscosity of the slag, lime, fluorite and 75 sic of 0.3kg/t steel are added to desulfurize the slag, and the ton of steel added by lime is less than 2Kg each time. During the desulfurization process, the flow rate of argon gas is 500 ~ 600Nl/min, and the acid-soluble aluminum in the molten steel is fed to the aluminum wire. After feeding the wire, the composition and temperature are fine-tuned. In order to better promote the floating removal of inclusions, control the soft mixing greater than 10min, the flow rate of soft mixing argon 20 ~ 40Nl/min(on the principle that the molten steel is not exposed), and the feeding amount of aluminum wire: the weight percentage content of aluminum in molten steel during the smelting process is maintained at 0.010 ~ 0.030% to control the feeding amount of aluminum wire.
The process of producing deep deoxidized steel by 75 silicon carbide deoxidizing method, fast deoxidizing silicon carbide slagging in the early stage of LF furnace, and fine tuning aluminum wire in molten steel. The process is stable, the desulfurization effect of LF slag-making is obvious, the casting billet quality is good, and the consumption of steel and aluminum per ton in the production of deep deoxidized steel is reduced by 0.42kg.
The silicon carbide deoxidizer successfully solved the difficulty of upgrading the top slag of converter steel and the whole aluminum deoxidization of LF furnace refining slag. The process of using silicon carbide + aluminum deoxidization of converter steel to improve the top slag and silicon carbide deoxidization of LF furnace to produce deep deoxidized steel and aluminum consumption of tons of steel and aluminum was greatly reduced. The smelting process is stable, the quality of the billet is good, and the aluminum consumption is reduced from the average 1.73kg/t to 1.31kg/t steel, which reduces the steel by 0.42kg/t, and the cost is reduced by 5.04 yuan /t steel, thus reducing the production cost and greatly improving the economic benefit.
75 Silicon carbide deoxidizer through the optimization of converter steel deoxidization system and slag making system, LF furnace with silicon carbide deoxidization slag making and LF furnace aluminum feed line fine-tuning the production process of aluminum in molten steel, using the characteristics of silicon carbide and aluminum, fully the smelting process of diffusion deoxidization and precipitation deoxidization reasonable combination, the process of converter steel deoxidization stability, LF furnace slag desulfurization effect is obvious. The quality of the casting billet is good, the pass rate of the steel plate is stable, and the consumption of steel and aluminum per ton in the production of deep deoxidized steel is reduced by about 0.42kg, which greatly improves the economic benefit of the production of deep deoxidized steel. Smelting process of silicon carbide deoxidation production of deep deoxidized steel control process, the process through the optimization of converter steel deoxidization system and slag making system, converter steel production according to the end oxygen value of the appropriate amount of 75 silicon carbide, LF furnace in the early stage of rapid deoxidization of silicon carbide slag, aluminum wire fine-tuning the process of aluminum in molten steel production of deep deoxidized steel, The aluminum content of molten steel is kept in the range of 0.010 ~ 0.030% to control the amount of aluminum wire feeding, and soft stirring is more than 10 minutes after the end of sulfur alloying.
Non-tempered steel is a phase change mechanism in which micro-alloying elements are added on the basis of the composition of medium carbon low alloy steel to change the structure, and through controlled rolling and controlled cooling, the product can reach or approach the level of tempered steel without being tempered. The use of non-tempered steel 75 silicon carbide not only saves the energy consumption of tempered treatment, ensures the performance of the product, but also greatly reduces the production cost, shorts the production cycle, meets the requirements of green, energy saving, environmental protection new materials, is the development trend of steel in the machinery industry.
The carbon in 75 silicon carbide is the most cost-effective element in non-tempered steel to improve strength, with the increase of carbon content, the amount of ferrite is reduced, the pearlescent volume is increased, the strength and hardness of steel are increased, but the plasticity and toughness of steel are reduced. 75 Silicon carbide in the solid solubility of the silicon in iron, can significantly strengthen the ferrite, has a strong solid solution strengthening effect. The silicon in silicon carbide can increase the volume fraction of ferrite in non-tempered steel, which is conducive to improving the toughness of steel, but the silicon content is too high, which is unfavorable to toughness.
The phosphorus in 75 silicon carbide can improve the strength of steel, but at the same time the phosphorus element is easy to be polarized at the grain boundary, thereby reducing the toughness of steel, especially the brittle transition temperature of steel is sharply increased, so low phosphorus is necessary for the low temperature toughness of steel, but the reduction of phosphorus in actual production means an increase in production costs.
The sulfur in 75 silicon carbide affects the mechanical properties of steel by forming sulfide inclusion, increasing the sulfur content in steel, the sulfur content increases, and the toughness of steel decreases; In addition, because the sulfide is easy to deform, it shows a long strip in the rolling process, which makes the mechanical properties of the steel show direction.
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