Normal strength structural steel refers to a type of steel that is commonly used in construction and building projects. It is also known as mild steel or low carbon steel. Although there are not many direct synonyms for this term, there are other terms that can be used to describe this type of steel. For example, it can be referred to as regular strength steel, conventional steel, or standard strength steel. Additionally, it can be classified as a type of plain carbon steel, which describes any steel that contains only carbon and small amounts of other elements. Overall, normal strength structural steel is a versatile and widely-used material.