The Study of Surface Longitudinal Crack on SPA-H Steel Slab by CSP

Abstract:

By the means of Metallographic analysis, scanning electron microscope (SEM), and energy spectrum analysis, the development of SPA-H surface middle longitudinal crack was studied. To find out the causes of the longitudinal crack, statistical method was adopted. The result shows that, the generating process of longitudinal crack was: the changing of mould powder owing to Ti and Al element, low overheating degree, and bad slag smelting, which leading to bad transfer heat of slab and depression. For the thermal stress of solidifying contraction, molten steel static pressure, and mould friction, the stress concentration was produced in the weak place of solidified shell, for example, in the small equiaxial crystal less than 1mm. the cracking occurred when the stress more than allow strength of high temperature slab.

• Periodical: Advanced Materials Research (Volumes 798-799)
• Pages: 190-196
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.798-799.190
• Online since: September 2013
• Authors: Qi Chun Peng, Jian Zou, Lei Qiu, Zhi Bo Tong, Wei Xiong
• Keywords: CSP, Low Carbon Steel, Surface Longitudinal Crack, Thin Slab

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