Iron, at room temperature and atmospheric pressure, is in a solid state. This is because its atoms are closely packed together in a crystal lattice structure, which keeps them rigid and fixed in place.
When heated to high temperatures, such as during the smelting process, iron can transition to a liquid state. The melting point of iron is approximately 1,538 degrees Celsius (2,800 degrees Fahrenheit), at which point the solid structure breaks down, and the iron becomes a molten liquid.
Moreover, under extreme conditions, such as very high temperatures and pressures found in astrophysical environments, iron can exist in different forms, yet in most practical situations on Earth, iron remains a solid for the majority of our applications, from construction to manufacturing.