The term "solid steel" refers to a type of metal that is made entirely out of steel, with no other materials or impurities mixed in. Steel is an alloy made primarily of iron and carbon, but can also contain small amounts of other elements such as manganese, phosphorus, sulfur, and silicon. When referring to "solid steel," the emphasis is on its purity and strength, suggesting that it is a strong, unyielding material with no weaknesses or flaws.