The standard manufacturing process of angle steel mainly involves hot - rolling and cold - forming. In hot - rolling, steel billets are heated to a high temperature until they become malleable. Then, they are passed through a series of rolling mills with specific shapes to form the L - shaped cross - section. This process is suitable for mass production and can produce large - size angle steel with good mechanical properties. Cold - forming, on the other hand, uses cold - working equipment to bend steel strips or plates into the shape of angle steel at room temperature. It is often used for producing smaller - size or special - shaped angle steel with higher precision and better surface finish.