Soft-cast steel is a type of steel that has a relatively low carbon content and can be easily shaped or manipulated. Synonyms for soft-cast steel include mild steel, low-carbon steel, and plain-carbon steel. This type of steel is very versatile and is commonly used in the manufacturing industry to create a wide range of products such as pipes, fittings, and machine parts. Soft-cast steel is also easy to weld and can be painted or coated to protect it from the elements. Its durability and affordability have made it a popular choice for many applications where strength and flexibility are important.