郝宁, 王新华, 王海涛, et al. Process for Production of Ultra-Low Sulphur Steel by BOF Tapping Desulphurizing-LF Refining[J]. Special Steel, 2006, 27(6): 44-46.
郝宁, 王新华, 王海涛, et al. Process for Production of Ultra-Low Sulphur Steel by BOF Tapping Desulphurizing-LF Refining[J]. Special Steel, 2006, 27(6): 44-46.DOI:
Because the sulphur content in steel NVA32(0. 12~0. 18C
1.30~1.60Mn)increases to 0.020% at 210 t BOF melting end point from original 0.005%
it shall be added 1000 kg binary synthetic slag CaO-CaF₂ and added 200 kg aluminium during BOF tapping and added Si-Mn alloy and Si-Al-Ba alloy to decrease sulphur content in steel by 0.007%~0.008% with desulphurization rate up to 30%.During LF refining
sulphur content in steel further decreases to 0.001%~0.002% by further added 800 kg synthetic slag
blown argon 600~900 L/min
after heating fed 600 m silicon- calcium wire then blown argon 30~45 L/min for 10 min with end slag basicity R = 4.5~5.5.