主播大秀

Fran Scott describes some of the uses of steel and then finds out how it is made from iron that has been produced in a blast furnace. The carbon content is reduced by blasting heated oxygen onto the molten iron and scrap metal is added to reduce the temperature. Fran helps to test the carbon content of some samples of steel. The red hot steel is rolled into long sections. The carbon content of the steel affects the properties and uses of the steel.