Low-carbon low-silicon high-quality carbon structural steel and production method thereof

Abstract

The invention discloses a low-carbon low-silicon high-quality carbon structural steel and a production method thereof. The structural steel comprises the following chemical components in percentage by weight: less than or equal to 0.06% of C, less than or equal to 0.03% of Si, 0.35-0.50% of Mn, less than or equal to 0.018% of P, less than or equal to 0.012% of S, 0.005-0.025% of Als, and the balance of Fe and residual elements. The production method disclosed by the invention comprises the following steps: KR (knotted reactor) hot metal pretreatment of high-quality hot metal, processing with a top-bottom combined blowing converter, pre-deoxidization of molten steel, alloying of molten steel, final deoxidization process of molten steel, argon blowing process, continuous casting and casting blank stack cooling. In order to ensure the high quality of molten steel smelted with converter, the good quality of raw and auxiliary materials used in the converter smelting process must be guaranteed, wherein the raw and auxiliary materials include hot metal, waste steel, lime, light-burnt magnesium ball, ore, alloy, deoxidizer, aluminum wire, refining slag, calcium carbide, fluorite and covering agent. The invention has the advantages of simple process, strong adaptability and relatively low cost.

Description

technical field [0001] The invention relates to the production of steel products, in particular to a low-carbon and low-silicon high-quality carbon structural steel and a production method thereof. Background technique [0002] The main feature of high-quality carbon structural steel is the ultra-low content of C and Si in the steel; high-quality carbon structural steel is widely used, and its production volume is also increasing with the continuous increase of market demand. Due to the special requirements of the chemical composition of steel, in the production process, in order to ensure the quality requirements of the final molten steel, most enterprises adopt LF refining in the production process, but in the refining process, the reducing atmosphere of refining leads to the reduction of Si in steel slag , In this way, the Si content in molten steel will exceed the standard requirements, which will eventually lead to smelting failure. In some advanced iron and steel ente...

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Problems solved by technology

Due to the special requirements of the chemical composition of steel, in the production process, in order to ensure the quality requirements of the final molten steel, most enterprises adopt LF refining in the production process, but in the refining process, the reducing atmosphere of refining leads to the reduction of Si in steel slag , in this way, the Si content in molten steel will exceed the standard requirements, eventually leading to smelting failure

In some advanced iron and steel enterprises, in order to smelt this type of steel, RH refining treatment is mainly adopted. Although the standard requirements are finally met, the production cost has increased significantly

In addition, the RH refining equipment is expensive, which cannot be afforded by ordinary iron and steel enterprises.

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