X70管线钢连续冷却过程的相变研究  

Research on Phase Transformation of X70 Pipeline Steel during Continuous Cooling

作　　者：王勇[1] 

机构地区：[1]济钢集团有限公司技术中心,山东济南250101

出　　处：《山东冶金》2012年第3期32-34,共3页Shandong Metallurgy

摘　　要：以两种微合金化方式(Nb、V、Ti和Nb、V、Ti、Mo)的X70管线钢为研究对象,在MMS-200热模拟试验机上进行了双道次轧制工艺模拟试验,研究不同卷取温度、冷却速度对X70显微组织的影响。结果表明,随着卷取温度的降低及冷速的提高,金相组织细化。卷取温度在520℃、冷速在15℃/s左右可以得到较为理想的针状铁素体组织。Nb、V、Ti微合金化管线钢,当冷却速度为15℃/s时,带状组织完全消失。Taking the two kinds of X70 pipeline steel, which are alloyed with Nb V Ti and Nb V Ti Mo respectively, as research objects, the process simulation test of two rolling passes was made by means of MMS-200 thermomechanical simulator amt the influences of coiling temperature and cooling rate on the microstructure of the X70 steel were investigated. The results showed that with the decrease of coiling temperature and the increase of cooling rate, the microstructure is more refined. When the coiling temperature is at .520 ℃ and the cooling rate is at 15 %/s, the perfect acicular ferrite microstrueture is obtained. For XT0 steel micro alloying with Nb V Ti, when the cooling rate is at 15 ℃/s, the banded structure would be avoided.

关 键 词：X70管线钢 连续冷却 相变 CCT曲线 针状铁素体 

分 类 号：TG111.5[金属学及工艺—物理冶金]