Medium-tensile steels such as ' A' and' B' quality steel, and high-tensile steels such as Q.T.28 and Q.T.35, are usually only used for particular parts of the structure where a steel stronger than mild steel is required .
Iintsimbi ezinobulunga obutsaleka nje ngokuphakathi ezifana no-' A' no-' B', kunye nentsimbi ezitsaleka ngokuphezulu ezifana no-Q.T.28 no-Q.T.35, zidla ngokusetyenziselwa amalungu athile esakhiwo apho intsimbi eyomelelyo kunephakathi ifunekayo.