Smelting method of welding rod steel h08a

Abstract

The invention relates to a welding electrode steel H08A smelting method and belongs to the technical field of ferrous metallurgy. The welding electrode steel H08A smelting method solves the technicalproblems of short continuous casting time and open casting blank bubble defects. According to the technical scheme, the welding electrode steel H08A smelting method comprises converter smelting, LF (ladle furnace) refining and continuous casting, wherein, during LF refining, slag foaming agent with CaO and CaC2 as the major components and refining slag adjusting agent with Al, Al2O3 and CaO as themajor components are added for diffusive deoxygenation; controlling the oxygen activity of molten steel to be 0.0020%-0.0040%, the Als content to be 0.001%-0.005% and the Si content of added ferrosilicon to be 0.02%-0.03%, and then performing calcium treatment. By scheduling reasonable molten steel control temperature, the welding electrode steel H08A smelting method can be applied to stably andcontinuously producing welding electrode steel H08A continuous casting blanks without internal defects.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for smelting welding rod steel H08A. Background technique [0002] H08A welding rod steel is an important raw material for welding rod production. It is a low-carbon, low-silicon, and low-aluminum steel. One of the biggest differences from other steels is to ensure the chemical composition of the finished steel. The composition requires Si≤0.03%. C≤0.08%, Al≤0.005%. In the production process of H08A welding rod steel, it is necessary to add a deoxidizer for deoxidation. Generally, aluminum is used as a deoxidizer, and the addition of a deoxidizer will generate a large number of inclusions, which are easy to block the tundish nozzle, affecting the castability of molten steel and continuous casting. , but if the deoxidizer is insufficient, due to poor deoxidation, the slab will produce bubbles. Therefore, the production of H08A welding rod s...

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Problems solved by technology

[0003] Patent CN104480250A discloses a high-efficiency deoxidation process for electrode steel. It mainly places metal aluminum in the tundish, and then injects molten steel into the tundish for deoxidation. However, this method will produce a large number of inclusions in the tundish. In molten steel, it is difficult to remove, affecting the pourability of molten steel

Patent CN1566370A discloses a production method of continuous casting carbon welding rod steel. It adds Al-Mn ferro-manganese to the ladle for pre-deoxidation through converter tapping, then refines on-line constant oxygen, feeds aluminum wire or aluminum particles, and precisely adjusts the oxygen activity of molten steel. , the patent only relies on aluminum wire or aluminum-iron for direct deoxidation, a large amount of alumina inclusions will be produced in molten steel, and such inclusions are the most important substance to block the submerged nozzle, so this method is easy to cause nozzle blockage

Patent CN1455004A discloses a continuous casting production process of ultra-low silicon electrode steel. In the deoxidation and alloying process, the following deoxidizers are added according to the total amount of molten steel: calcium carbide, ferro-titanium alloy and silicon-calcium alloy are added to the ladle. Al-Mn-Fe alloy is added into the converter. This patent adds deoxidizer in batches. Although it avoids the negative impact brought by all the deoxidizers to a certain extent, it does not monitor the oxygen activity, and there are still air bubbles and castability. The problem