Nb-V微合金化高碳钢在弹性盖板针布用钢丝上的运用

Application of Nb-V microalloyed high carbon steel in steel wire for flexible flat-top card clothing

通过对比添加Nb前后72B钢丝的显微组织、拉伸曲线、弯曲次数分析了钢丝的基本性能变化。结果表明,与72B钢丝相比,添加Nb后钢丝成品的晶粒度从12.5~13级升高至14~14.5级;屈服强度从1745.8 MPa提升至2108 MPa,提高了约20.7%;抗拉强度从1930.7 MPa提升至2209.5 MPa,提升了14.4%;断裂前的弯曲次数从1041次增加到1335次,增加了28.2%。说明钢丝在盖板针布的工作环境下具备更好的耐磨性,可以显著提高盖板针布的使用寿命。通过现场试验的验证,新材料钢丝制成的盖板针布的寿命提升了约30%。

Changes of basic properties of the 72 B steel wires before and after the addition of niobium were analyzed by comparing the microstructure, tensile curves, and number of bends before fracture of the steel wires. The results show that comparing with 72 B steel wire, the grain size grade of the steel wire product with Nb addition increases from 12.5-13 to 14-14.5. At the same time, the yield strength increases by 20.7% from 1745.8 MPa to 2108 MPa, and the tensile strength increases by 14.4% from 1930.7 MPa to 2209.5 MPa. The bending test shows an increasement of 28.2% from 1041 to 1335 before the fracture. These improvements imply the possibility to have higher wear resistance and significant improvement in the life span of the flat top card clothing when the steel wire is applied in the operating environment. Such improvement has been verified by the field experiments, i.e., the life span of the flat top card clothing made of the new niobium microalloyed steel wire is improved by 30%.