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Intrinsic Quality and Mechanical Properties of LX80B Steel Wire Rod Used for Steel Cord

In order to find out the differences between domestic and imported LX80B steel wire rods, intrinsic quality and mechanical properties were studied by OM, SEM, EPMA, tensile testing machine and other instruments. The results show that the quantity of brittle non-metallic inclusions of domestic steel wire rods is 5 times as many as imported steel wire rods. The serious carbon segregation in domestic steel wire rods results in delamination fracture during twisting. The oxide scales of domestic and imported steel wire rods are composed of inner layer (Fe1-yO) and outer layer (Fe3O4), yet the thickness of oxide scale for domestic ones is smaller than that of imported ones. The microstructure of domestic ones is composed of proeutectoid cementite and pearlite, while that of imported ones is mainly pearlite. The large variation of lamellar spacing of pearlite results in a large variation of mechanical properties of domestic ones.