3 results about "Oxygen converter" patented technology

A process for treating slag coming from steel production by means of an electric arc furnace (1), or an oxygen converter, and defined as starting slag, the process comprising the following steps: (i) mixing said starting slag in liquid form, comprising iron oxides (FexOy) with Aluminum and / or Silicon and / or Ferrosilicon scrap; (ii) metallothermic reaction between said iron oxides and said Aluminum and / or Silicon and / or Ferrosilicon scrap resulting in the production of (a) Iron, and (b) aluminum oxide (AI2O3) and / or silicon oxide (SiO2); (iii) separating the Iron and the treated slag, with reduced iron oxide content, said treated slag incorporating said aluminum oxides (AI2O3) and / or silicon oxides (SiCfe) formed in step (ii); wherein said mixing occurs gradually, at least partially by directly feeding said Aluminum and / or Silicon and / or Ferrosilicon scrap into a flow of the starting slag in liquid form during a pouring step from a first container to a second container; wherein said second container receives both the starting slag flow and the Aluminum and / or Silicon and / or Ferrosilicon scrap added thereto and acts as a metallothermic reactor; and wherein the Aluminum and / or Silicon and / or Ferrosilicon scrap is fed in a controlled manner by means of a dosing device (6).

This invention relates to a 60-100mm thick SA537CL1 steel plate with excellent die-welding performance and its manufacturing method, belonging to the field of metallurgical technology. The chemical composition of the steel plate (wt%) is: C: 0.06-0.09%, Si: 0.25-0.50%, Mn: 1.40-1.60%, P≤0.010%, S≤0.003%, Ni: ≤0.10%, Mo: 0.05-0.08%, Nb: 0.010-0.030%, Ti: 0.010-0.030%, with the balance being Fe and unavoidable impurities, and a carbon equivalent (Ceq) ≤0.36%. The surface microstructure is bainite, the microstructure at 1 / 4 thickness position is acicular ferrite + pearlite, and the core microstructure is polygonal ferrite + pearlite + acicular ferrite. The manufacturing process is as follows: oxygen converter smelting → ladle furnace refining → vacuum treatment → thick slab continuous casting → billet cooling → billet heating → controlled rolling → controlled cooling → stacking and slow cooling.

The invention provides a method for smelting high-quality carbon strip steel from converter low-silicon high-temperature molten iron, which belongs to the technical field of oxygen converter steelmaking, and comprises the following steps: before smelting, inputting the components and temperature of molten iron into a heat balance calculation model system, and filling scrap steel and low-silicon high-temperature molten iron according to the calculated quantity of the scrap steel and the molten iron. A first batch of slagging materials is added while blowing is started, 50% of lime, 50% of light-burned dolomite and 50% of cold-pressed iron balls are added, and 100% of dolomite is added; and when the oxygen blowing amount is 20%-25% of the total oxygen supply amount, adding the rest metallurgical lime and light-burned dolomite. And slag charge consumption: 22-25 kg of lime is consumed per ton of steel, 18-24 kg of light-burned dolomite is consumed per ton of steel, 6-10 kg of dolomite is consumed per ton of steel, and 22-24 kg of cold-pressed iron ball is consumed per ton of steel. The method solves the problems of difficult slagging and low dephosphorization rate in smelting of high-quality carbon strip steel from low-silicon high-temperature molten iron in the converter.