A converter smelting method for increasing residual manganese in molten steel with high manganese and high silicon
A converter smelting and molten iron technology, which is used in the improvement of process efficiency and the manufacture of converters, etc., to reduce costs, improve product market competitiveness, and improve distribution concentration.
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Embodiment 1
[0033] A. Smelting and loading process: pour out all the final slag in the converter after tapping the steel in the upper furnace and splashing the slag, according to 5.0kg / t 钢 The amount, add conventional active lime to the converter; according to 95kg / t 钢 The ratio of steel scrap is loaded into a 50-ton LD converter with the following mass ratios of steel scrap: C 0.12wt%, Si 0.12wt%, Mn 0.40wt%, P 0.020wt%, S 0.020wt%, 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 ratios of pig iron: C 3.3wt%, Si 0.30 wt%, Mn 0.32wt%, P 0.058wt%, S 0.018wt%, the rest is Fe and unavoidable impurity) into the LD converter; then press 950kg / t 钢 The proportion of molten iron is loaded, and the following temperature and mass ratio of high-manganese and high-silicon molten iron are added to a 50-ton LD converter: molten iron temperature 1270 ° C, molten iron composition C4.40wt%, Mn1...
Embodiment 2
[0039] A. Smelting and loading process: pour out all the final slag in the converter after tapping the steel in the upper furnace and splashing the slag, according to 5.5kg / t 钢 The amount, add conventional active lime to the converter; according to 105kg / 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 0.16wt%, Si 0.20wt%, Mn 0.55wt%, P 0.029wt%, S 0.025wt%, the rest is Fe and unavoidable impurity; according to 45kg / t 钢 The proportion of pig iron loaded into the 50-ton LD converter is added with the following mass ratio of pig iron: C3.4wt%, Si 0.40wt%, Mn 0.43wt%, P 0.067wt%, S 0.022wt%, the rest is Fe and unavoidable impurities) into the LD converter; then press 935kg / t钢 The proportion of molten iron is loaded, and the following temperature and mass ratio of high-manganese and high-silicon molten iron are added to a 50-ton LD converter: molten iron temperature 1285 ° C, molten iron composition C4....
Embodiment 3
[0045] A. Smelting and loading process: pour out all the final slag in the converter after tapping the steel in the upper furnace and splashing the slag, according to 6.0kg / t 钢 The amount, add conventional active lime to the converter; according to 115kg / 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 0.20wt%, Si 0.30wt%, Mn 0.70wt%, P 0.038wt%, S 0.030wt%, the rest is Fe and unavoidable impurity; according to 40kg / 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 920kg / t 钢 The proportion of molten iron is loaded, and the following temperature and mass ratio of high-manganese and high-silicon molten iron are added to a 50-ton LD converter: molten iron temperature 1300 ° C, molten iron composition C4....
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