关键词: 铬合金化, 超高强钢帘线, 强韧化, 珠光体团, 索氏体片层间距

Abstract: To ensure the prerequisite of [Mn]+[Cr] controlled by0.5%-0.6%, the content of Mn is reduced from 0.50% to0.24%, and the content of Cr is increased from 0.021% to 0.32% in order to keep hardenability and obtain higher strength and toughness of C82D2Cr steel. The results show that, compared with C82D2 steel φ5.5 mm wire rod, the tensile strength of C82D2Cr steel φ5.5 mm wire rod is increased by 50 MPa, the reduction of area is increased by 4%, the lamellar spacing of sorbite is decreased by 9.8%, and the size of pearlite colony is decreased by 14.5%.C82D2Cr steel not only has obvious dislocation line at the interface between ferrite and cementite, but also increases dislocation line density, and increases dislocation cells in ferrite, which can significantly increase; deformation strengthening ability. The custom- er has verified that C82D2Cr steel rod can meet the production requirements of 2×0.30UT steel cord.

Key words: Chromium Alloying, Ultra High Strength Steel Cord, Strengthening and toughening, Pearlite Colony, Sorbite Lamellar Spacing