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    高酸性環(huán)境用超低硫管線鋼冶煉工藝研究

    Study on Melting Process of Ultra-low Sulfur Steel for Linepipe Used under High-acid Service Condition

    • 摘要: 介紹了在鐵水預(yù)處理難以達(dá)到深度脫硫的條件下,以脫硫熱力學(xué)和動(dòng)力學(xué)理論為基礎(chǔ),對鐵水預(yù)處理、轉(zhuǎn)爐煉鋼、爐外精煉等工序的工藝進(jìn)行優(yōu)化。通過對鐵水預(yù)處理采用復(fù)合脫硫劑、轉(zhuǎn)爐冶煉控制硫含量以及出鋼脫硫、LF精煉雙渣深度脫硫等各工序脫硫進(jìn)行合理分配,達(dá)到了彌補(bǔ)鐵水預(yù)處理未能深度脫硫、減小LF精煉爐脫硫負(fù)荷的目的,冶煉出w(S)≤0.001%、Ca/S≥2.0、夾雜物均不大于0.5級的高酸性環(huán)境用超低硫管線鋼。

       

      Abstract: Since it is hard to get deep desulfurization of hot metal just though pre-treatment process,related processes such as hot-metal pre-treatment,converter steel-making and off-furnace refining are optimized based on the theories of both thermodynamics and dynamics concerning desulfurization.Relevant technological measures are taken to properly and quantitatively control desulfurization level in process steps like hot metal pre-treatment with compound desulfurizer,sulfur content control in converter melting,desulfurizing in tapping and dual-slag deep desulfurizing in LF refining,so as to compensate the inefficiency of deep desulfurization during hot metal pre-treatment,and reduce the desulfurization intensity of the LF process.As a result,it is successful to produce the ultra-low sulfur steel for linepipe to be used under hi-acid service condition,which is in possession of w(S) ≤0.001%,Ca/S≥2.0 and inclusion ratings of A,B,C and D not higher than 0.5.

       

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