微合金化钢连铸坯角部横裂纹形成机制

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Abstract In order to research the formation mechanism of transverse corner crack on micro-alloyed steel slab, the precipitation behaviors of the second phase particles during the continuous casting process were investigated, and the industrial trial of stagnant slab were carried out. The calculation results show that the beginning precipitation temperature of titanium carbonitride, niobium carbonitride, aluminum nitride in X65 pipeline steel are 1508, 1123, 1165℃ respectively. And the precipitation peak temperatures are 1360, 870, 840℃. Results of stagnant slab test show that no crack appeared in mold and vertical segments. But at 3270mm away from the meniscus, that is 710mm after bending, transverse crack begins to appear at outer arc surface. No crack in inner arc surface appears. The slab corner temperature at bending part is in the steel brittle temperature zone and under the tensile stress at the same time, which is the main cause for the appearance of transverse corner crack at outer arc surface.

Received: 21 March 2012 Published: 30 October 2012

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	YU Meng-Lin

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YU Meng-Lin. Formation Mechanism of Transverse Corner Crack on Micro-Alloyed Steel Slab[J]. Iron and Steel, 2012, 47(10): 27-33.

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http://www.chinamet.cn/Jweb_gt/EN/ OR http://www.chinamet.cn/Jweb_gt/EN/Y2012/V47/I10/27

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