Steel is used in many tools, parts and products. Steel is manufactured with mining iron or using scrap iron and purifying materials in a reduction furnace. Steel manufacturers often pour steel into molds as per the demands of various industries. Steel manufacturers manufacture steel for stadiums, bridges and airports. Steel is also used in bolts, nails and screws. Steel is used in ship building, mining, heavy equipment, washing machines and pipeline transport. Many artists employ the use of steel as a medium of expression for sculptures.