Ultra low silicon welding rod steel continuous casting production process

Abstract

The continuously-casting production process of conventional welding electrode steel includes the following procedures: molten iron preparation, converter charging, converter smelting, deoxidization alloying, external refining and continuous casting. In the deoxidization alloying procedure, according to the total weight of molten iron the following deoxidizing agents are added, the calcium carbide, titanium-ion alloy and silicon-calcium alloy, etc. are added into the ladle, and the aluminium-manganese-iron alloy is added into the converter. Said invention implements of continuous coating production of ultralow silicon welding electrode steel, and its silicon content is less than 0.035.

Description

technical field [0001] The invention belongs to the field of converter steelmaking deoxidation and alloying technology, and is an ultra-low silicon welding rod steel continuous casting production technology. Background technique [0002] The original production process of welding rod steel is boiling steel smelting and die casting into ingots. According to GB / T3429-82, its silicon content is ≤ 0.03%. Due to the inevitable severe regional segregation of boiling steel ingots (see: boiling steel production Γ.H. Aoix Metallurgical Industry Press), in order to ensure the composition requirements of welding rod steel , after the initial rolling of the steel ingot, the high-carbon segregation area at the head of the original steel ingot must be removed, accounting for about 1 / 3 of the total weight of the steel ingot, which seriously affects economic benefits. [0003] With the technological progress of the iron and steel industry, full continuous castin...

AI Technical Summary

Problems solved by technology

First of all, due to the low carbon content requirement at the end point, the corresponding end point oxygen content is high and fluctuates greatly, the amount of strong deoxidizer used for deoxidation is relatively large, and the content of C and Si in the electrode steel is low, so it is necessary to use low silicon or Deoxidation with a strong deoxidizer that does not contain silicon, and all of this type of strong deoxidizer is added to the ladle, which is very prone to silicon increase, and it is difficult to make the silicon content in the steel less than 0.03%, which exceeds the standard range. In addition, a large number of strong deoxidizers are all Adding ladle deoxidation, deoxidation products are not easy to remove, especially when Al 2 o 3 When the inclusions are high, it is easy to cause nodulation at the continuous casting nozzle, which is not conducive to normal production, and the AL 2 o 3 Higher inclusion content will also seriously affect the drawability of steel