Abstract: The  effect  of titanium  content  on  mechanical  properties  of  14～20  mm  hot  rolled plate  of Q345A  steel (0.08~0. 10C,1.19～1.46Mn,0.017～0.029Nb,0.02～0.08Ti) has  been studied. Results showed that as Ti=0.02%, the strength  of  steel  plate  was  not  obvious  change,as  Ti  content  was0.02～0.04%,with  increasing  Ti  content the  strength  of  steel  plate  increased,and  as  Ti≥0.04%,with  increasing  Ti  content  the  strength  of  steel  plate  decreased.  With  controlling  Ti  content  within0.02%~0.04%  in  Nb-Ti  microalloying  Q345A  steel  for  heavy  truck  plate, the  optimum  combined strength and plasticity shall be got.

Key words: Nb-Ti Microalloying, Q345A Steel Plate, Titanium Content, Mechanical Properties

摘要： 试验研究了钛含量对Q345A钢(%:0.08～0.10C、1.19～1.46Mn、0.017～0.029Nb、0.02～0.08Ti) 14～20mm热轧板力学性能的影响。结果表明,Ti=0.02%时,钢板的强度无显著变化,Ti为0.02%～0.04%时,钢板强度随Ti含量增加而增加;Ti≥0.04%时,钢板强度随Ti含量增加而下降。控制Nb-Ti微合金化重型汽车板用钢Q345A的Ti含量为0.02%～0.04%,可获得最佳强塑性配合。

关键词: Nb-Ti微合金化, Q345A钢板, 钛含量, 力学性能