To form molter slag
To supply the oxygen
To burn the carbon in coke
To increase the melting point of ore
Depth micrometer
Inside micrometer
Outside micrometer
Screw thread micrometer
Thread angle
Type of thread and pitch
Root and crest
Major diameter
Depth
External dimension
Angular dimension
Size of holes, slots and recesses
Pig iron
Cast iron
Wrought iron
Malleable iron
