Problems of dephosphorization during steelmaking

Ibraev, I. K.; Ibraeva, O. T.

doi:10.1134/s0036029513060062

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“…Phosphorus can make the steel prone to embrittlement during heat treatment and have a detrimental effect on mechanical properties. 1–3 Dephosphorisation is an important metallurgical function of a top–bottom combined basic oxygen converter because the subsequent secondary refining process cannot provide additional phosphorus removal. However, production of low phosphorus steel (0.06–0.015%P at tap) in a single converter is a particularly challenging problem when the phosphorus content in hot metal is high (above 0.2%).…”

Section: Introductionmentioning

confidence: 99%

Effect of MgO content in slag on dephosphorisation in converter steelmaking

Chen

2014

Ironmaking & Steelmaking

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In this study, the effect of MgO content in slag on the phosphorus distribution ratios, and the equilibrium solubility of MgO in slag during converter steelmaking were analysed using the modified Kozheurov regular solution model and the thermodynamic package FactSage. Thermodynamic analysis shows that the MgO content in the final slag should be greater than 5% to saturate the slag with MgO and minimise the chemical wear of the refractory lining. However, the phosphorus distribution ratio decreases dramatically with increasing MgO. Industrial tests were performed using an 80-t top-and-bottom combined blown converter showed that the average phosphorus distribution ratio reduces significantly from 120.7 to 75.7 when the average MgO content in the final slag increases from 7.0 to 9.8%, due to thermodynamics and kinetics reasons. By optimizing the MgO content between 6 and 8% dephosphorisation and refractory wear are optimised.

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Section: Introductionmentioning

confidence: 99%

Effect of MgO content in slag on dephosphorisation in converter steelmaking

Chen

2014

Ironmaking & Steelmaking

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Problems of dephosphorization during steelmaking

Cited by 1 publication

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Effect of MgO content in slag on dephosphorisation in converter steelmaking

Effect of MgO content in slag on dephosphorisation in converter steelmaking

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