Microstructure Control and Strengthening of High-carbon Steel Wires

Nippon Steel Corporation has developed various wire rods for high strength steel wires in order to satisfy the requirements of strengthening of steel cord, steel wires for bridge cables and PC strand. The nano order microstructure control technique which is the key to the strengthening of high carbon steel wires, and the current state of high strength steel wires were outlined. It is important to clarify the micro- structural change of steels wires due to heavy deformation and the effect of cement- ite decomposition on delamination occurrence for the purpose of achieving the fur- ther strengthening of high carbon steel wires. Recent results of such a basic re- search field were presented as well.