摘要
通过加入微合金元素Nb，发挥其在高温变形时推迟奥氏体的再结晶时间，提高奥氏体再结晶温度的作用，轧制工艺上采用控制轧制和控制冷却能有效提高Q345系列钢板的强韧性。采用再结晶控制轧制及非再结晶控制轧制等方法来控制钢板晶粒尺寸，细化晶粒，发挥细晶强化以及析出强化的作用，可以降低钢板的韧脆转变温度。试验结果显示，在钢中加入微合金元素Nb后，通过控制轧制控冷工艺，提高了Q345系列中厚钢板的强度，特别是50％FTT达到-73℃，与Q345B钢板相比降低了48℃。
When the microalloy element Nb is added, microalloy plays a function to put off the time of austenitic re-crystalization and to improve its temperature, while on the roiling technics, the controlled roiling and controlled cooling are applied which effectively improve the intension and toughness of Q345E steel plate. And applying re-crystalization rolling and non-recrystalization rolling etc. methods to control the grain size of plate, to fine the grain and to play the action of fineness and separation intensifying can fall the 50% FATT. The testing result shows that after the microalloy element Nb is added into the plate, the strength and ductility of Q345E steel plate is improved, especially 50% FATF, it reaches to -73℃, reduced about 48℃ than Q345B Steel Plate.
出处
《首钢科技》
2007年第5期27-30,共4页
Shougang Science and Technology
关键词
NB
控轧控冷
再结晶
50%
FATT
Nb, controlled roiling and controlled cooling, re-crystalization, 50% FATT
