The quality of raw materials has a profound impact on the performance of angle steel. High - quality steel billets with the correct chemical composition and low impurity levels are essential for producing angle steel with good mechanical properties. For example, if the raw materials contain excessive sulfur and phosphorus, it can reduce the strength and toughness of the angle steel, causing problems such as hot - shortness and cold - brittleness. A proper balance of elements like carbon, manganese, and silicon in the raw materials ensures that the angle steel has high strength, good ductility, and excellent corrosion resistance. Therefore, strict control of raw material quality is crucial for manufacturing high - performance angle steel.