Torch cutting crack of Ti bearing high strength slab
LIU Xue- hua1, 2,ZHAO Zhi- hai2,QIU Sheng- tao1,GAN Yong3
1. National Engineering Research Center of Continuous Casting Technology, Central Iron and Steel Research Institute, Beijing 100081, China 2. Technology Center, Ma′anshan Iron and Steel Co., Ltd., Ma′anshan 243000, Anhui, China 3. The Chinese Society For Metal, Beijing 100711, China
Abstract：Ti alloyed high strength steel had gained wide spread application because micro- alloying element Ti was cheaper compared with other micro- alloying elements. But addition of Ti was prone to cause crack defect on slab. Aiming at the torch cutting crack on high strength slab bearing wTi=0.1%, the temperature variation during and after torch cutting was simulated by ANSYS software, the morphology of crack and microstructure of slab were examined and the temperature- dilatation curve of the steel was tested, which elucidated the the reasons for the crack from the perspective of phase transformation during and after torch cutting. The results showed that cooling rate of the high strength slab bearing wTi=0.1% could reach as high as 10℃/s within the range of 30mm from torch cutting plane after torch cutting. High cooling rate made the Beinatic and Martensitic phase transformation, which caused the torch cutting cracks on the slab.
收稿日期: 2015-09-09
出版日期: 2016-01-26
通讯作者:
刘学华
E-mail: 15755519332@163.com
引用本文:
刘学华 赵志海 仇圣桃 干勇. 含钛高强钢板坯的火焰切割裂纹[J]. 中国冶金, 2016, 26(01): 42-46.
LIU Xue- hua, ,ZHAO Zhi- hai,QIU Sheng- tao,GAN Yong. Torch cutting crack of Ti bearing high strength slab. China Metallurgy, 2016, 26(01): 42-46.
2016, Vol. 26 
