Analysis on Causes of Corner Transverse Cracks Formation for Q345B Slab

Li Juyan; Wen Guanghua; Tang Ping; Guo Qiushi

Volume 31 Issue 4

Oct. 2010

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ZHU Tao, SHI Lifa, CHEN Qian. Effect of Annealing Microstructure and Texture on Magnetic Properties for the Low Grade Cold Rolled Non-oriented Silicon Steel by CSP Process[J]. IRON STEEL VANADIUM TITANIUM, 2008, 29(4): 48-51,57.

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Li Juyan, Wen Guanghua, Tang Ping, Guo Qiushi. Analysis on Causes of Corner Transverse Cracks Formation for Q345B Slab[J]. IRON STEEL VANADIUM TITANIUM, 2010, 31(4): 56-61.

Citation:

Li Juyan, Wen Guanghua, Tang Ping, Guo Qiushi. Analysis on Causes of Corner Transverse Cracks Formation for Q345B Slab[J]. IRON STEEL VANADIUM TITANIUM, 2010, 31(4): 56-61.

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Analysis on Causes of Corner Transverse Cracks Formation for Q345B Slab

College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

Received Date: 2010-07-21

Abstract

Abstract

Features and causes of corner transverse cracks for Q345B slab were analyzed based on metallographic microscopy,scanning electron microscopy and energy dispersion scanner.The results shows that the causes of forming cracks are the chain-like manganese sulfide compound and the film-like proeutectoid ferrite precipitated surrounding the austenite grain boundaries.The fine MnS precipitated along the austenite grains boundaries during slab solidification,then further accelerated the formation of thin films proeutectoid ferrite when the temperature of the slab surface droped to the austenite-ferrite transformation temperature range.When the slab was subject to straightening stress,all the strain mainly concentrates in these thin films,encouraging the formation of micropore around the MnS boundaries and these micropore polymerization gradually results in the formation of the crakes.
- continuous casting,
- microstructures,
- transverse crack,
- precipitates

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