A converter smelting method for increasing residual manganese in molten steel with medium, high manganese, high phosphorus and low silicon
A converter smelting, high-phosphorus technology, applied in the field of medium-high-manganese, high-phosphorus, low-silicon molten iron to increase the residual manganese in the final molten steel, and in the field of converter smelting, to improve product market competitiveness, optimize kinetic and thermodynamic conditions, and achieve good smelting slag dephosphorization effect Effect
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Embodiment 1
[0033] A. Smelting and loading process: after the steel tapping and slag splashing of the upper furnace, all the final slag is kept in the converter, according to 4.0kg / t 钢 The amount, add conventional active lime to the converter; according to 55kg / t 钢 The ratio of steel scrap is loaded into a 50-ton LD converter with the following mass ratios of steel scrap: C 0.20wt%, Si 0.35wt%, Mn 1.20wt%, P 0.035wt%, S 0.028wt%, the rest is Fe and unavoidable impurity; according to 50kg / t 钢 The proportion of pig iron loaded into the 50-ton LD converter is added with the following mass ratio of pig iron: C3.3wt%, Si 0.30wt%, Mn 0.32wt%, P 0.058wt%, S 0.018wt%, the rest is Fe and unavoidable impurity) into the LD converter; then press 980kg / t 钢 The proportion of molten iron is loaded, and the following temperature and mass ratio of medium-high manganese, high-phosphorus and low-silicon molten iron are added to a 50-ton LD converter: molten iron temperature 1300 ° C, molten iron compositi...
Embodiment 2
[0039] A. Smelting and loading process: after the steel tapping and slag splashing of the upper furnace, all the final slag is kept in the converter, according to 4.5kg / t 钢 The amount, add conventional active lime to the converter; according to 82kg / t 钢 The proportion of steel scrap loaded into the 50-ton LD converter is added with the following mass ratio of steel scrap: C 0.23wt%, Si 0.42wt%, Mn 1.30wt%, P 0.040wt%, S 0.033wt%, the rest is Fe and unavoidable impurity; according to 50kg / t 钢The proportion of pig iron loaded into the 50-ton LD converter is added with the following mass ratio of pig iron: C3.5wt%, Si 0.40wt%, Mn 0.43wt%, P 0.067wt%, S 0.022wt%, the rest is Fe and unavoidable impurity) into the LD converter; then press 965kg / t 钢 The proportion of molten iron is loaded, and the following temperature and mass ratio of medium-high manganese, high-phosphorus and low-silicon molten iron are added to a 50-ton LD converter: molten iron temperature 1320 ° C, molten iro...
Embodiment 3
[0045] A. Smelting and loading process: after the steel tapping and slag splashing of the upper furnace, all the final slag is kept in the converter, at a rate of 5.0kg / t 钢 The amount, add conventional active lime to the converter; according to 70kg / t 钢 The proportion of scrap steel is loaded into the 50-ton LD converter with the following mass ratio of scrap steel: C 0.26wt%, Si 0.50wt%, Mn 1.40wt%, P 0.046wt%, S 0.039wt%, the rest is Fe and unavoidable impurity; according to 50kg / t 钢 The proportion of pig iron loaded into the 50-ton LD converter is added with the following mass ratio of pig iron: C3.6wt%, Si 0.50wt%, Mn 0.55wt%, P 0.075wt%, S 0.027wt%, the rest is Fe and unavoidable impurity) into the LD converter; then press 950kg / t 钢 The molten iron is loaded into the ratio, and the following temperature and mass ratio of medium-high manganese, high-phosphorus and low-silicon molten iron are added to a 50-ton LD converter: molten iron temperature 1330 ° C, molten iron co...
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