The conversion of pig iron to steel frequentl | vedclass

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(B) Pig iron contains a high percentage of carbon $(3-4.5\%)$ and other impurities like $S, P, Si, Mn$. To convert pig iron into steel,these impuritie

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$I, II$

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(B) Pig iron contains a high percentage of carbon $(3-4.5\%)$ and other impurities like $S, P, Si, Mn$. To convert pig iron into steel,these impurities must be removed or reduced. $(I)$ Oxygen or iron oxide is added to oxidize the impurities (like $C$ to $CO$,$Si$ to $SiO_2$,etc.). $(II)$ Transition elements (like $Cr, Ni, Mn, V, W$) are added to impart specific properties such as hardness,corrosion resistance,and tensile strength to the steel. $(III)$ Inner transition elements are generally not added for this purpose. $(IV)$ Silica is an acidic impurity that is usually removed by adding a basic flux,not added to the steel. Therefore,the correct additions are $(I)$ and $(II)$.

The conversion of pig iron to steel frequently requires the addition of
$(I)$ oxygen or iron oxide
$(II)$ transition elements
$(III)$ inner transition elements
$(IV)$ silica

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The conversion of pig iron to steel frequently requires the addition of $(I)$ oxygen or iron oxide$(II)$ transition elements$(III)$ inner transition elements$(IV)$ silica