Process for smelting and continuously casting boron-containing high carbon steel for wire production

Abstract

The invention provides a process for smelting and continuously casting boron-containing high carbon steel for wire production. The process comprises the following steps of: 1) pretreating molten iron, namely controlling the sulphur content to be below 0.005 percent; 2) smelting by using a converter, namely producing high-basicity dregs at the earlier stage, wherein the basicity of the top dregs is 2.0 to 4.5, the FeO content is 8 to 20 percent, and the final temperature is between 1,600 and 1,680 DEG C; performing high-carbon tapping at the end of the smelting, namely controlling the carbon content to be 0.05 to 0.2 percent of the target carbon content of the steel; deoxidizing by using Si-Mn; and covering the pot by using 1 to 3 kg / t of white ashes after tapping; 3) refining by using a ladle furnace (LF), namely refining at the temperature of between 1,550 and 1,620 DEG C; adjusting molten steel components according to the target boron content of the steel before the end; and 4) performing continuous casting by a low superheat degree continuous casting process, wherein the superheat degree of tundish molten steel is between 10 and 23 DEG C. The process provided by the invention effectively promotes uniform distribution of boron elements in billet steel, prevents steel quality worsening by boron element gathering, and makes full use of the advantages of boron in the steel. The process can reduce the wire breaking rate of boron-containing high carbon steel rolled wires in the wire production gathering process by 18 to 25 percent.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, in particular to a technology for smelting and continuous casting of boron-containing high-carbon steel for wire making. Background technique [0002] B elements usually play a role in improving hardenability in steel. In addition, it can also play the role of nitrogen fixation. At present, our country has done a lot of work in the research of boron-containing steel, and has also developed a variety of boron-containing steel. [0003] The Chinese patent with the patent number "CN 200710113916.8" provides a boron-containing steel and a preparation method of the steel. The steel composition requirements are: C: 0.32% ~ 0.44%, Si: 0.15% ~ 0.37%, Mn: 1.10% ~ 1.40%, P≤0.030%, S≤0.030%, B: 0.0005% ~ 0.0035%, Al : 0.015% ~ 0.070%, the remainder is Fe and trace impurities. The preparation method comprises electric furnace smelting-external refining-steel billet continuous casting-se...

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Problems solved by technology

These are not conducive to the beneficial effect of B elements in steel.

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