Strengthening Mechanism of VN Microalloyed X60 Pipeline Steel Produced by Compact Strip Production Line
SU Shihuai1，HE Yizhu2，HU Xuewen1，LIU Xuewei2，WENG Yuqing3
1. Ma’anshan Iron and Steel Co. Ltd., Ma’anshan 243000, Anhui,China; 2. Anhui University of Technology, Ma’anshan 243002, Anhui,China; 3. The Chinese Society for Metals, Beijing 100711, China
Abstract：The microstructure and mechanical properties of vanadiumnitrogen(VN) microalloyed APIX60 pipeline steel(X60) with ultrafine grain and high toughness developed by converter steelmakingcompact strip production(CSP) line were studied to investigate the strengthening mechanism. The results show that the microstructure of the X60 is composed of polygonal ferrite and micro pearlite, the mean size of ferrite grains is less than 5 μm. It was observed that V(C,N) could not precipitate sufficiently in CSP process. The main strengthening mechanism of X60 is grain refining strengthening. The yield strength (YS) increases due to precipitation strengthening of V(C,N) and nonosized inclusion by about 60 MPa and 40 MPa respectively.
苏世怀;何宜柱;胡学文;刘学伟;翁宇庆. CSP流程钒氮微合金化X60钢的强化机理[J]. 钢铁, 2006, 41(9): 0-73.
SU Shihuai;HE Yizhu;HU Xuewen;LIU Xuewei;WENG Yuqing. Strengthening Mechanism of VN Microalloyed X60 Pipeline Steel Produced by Compact Strip Production Line. Iron and Steel, 2006, 41(9): 0-73.
2006, Vol. 41 