J. S. Qing, X. D. Duan
YQ450NQR1 high-strength weathering steel is prone to cracking, posing a significant challenge in its production process. This study aims to investigate the cracking mechanisms and patterns specific to this material, as well as to identify the contributing factors leading to such defects. The methodology involves using metallographic and scanning electron microscopy techniques to examine the cracks and assess the presence of decarburized layers in the continuous casting bloom. Additionally, we analyze multiple controlling factors, including the carbon content of molten steel, the residual elements in the alloy, the purity and performance of the mold powder, and the flow of secondary cooling water. Our results demonstrate that by optimizing these processes, particularly the alloy composition and cooling methods, the cracking reject ratio can be significantly reduced from 3.5% to 0.78%. These findings have important implications for improving the manufacturing quality of YQ450NQR1 steel, thereby enhancing its application in high-strength and weather-resistant structural components for railway vehicles.
@article{d9158978-db17-4afc-891d-8470f4897b10,
title={Study on the Cracking Mechanism of YQ450},
author={J. S. Qing and X. D. Duan},
year={2026},
language={en}
}TY - JOUR TI - Study on the Cracking Mechanism of YQ450 AU - J. S. Qing AU - X. D. Duan PY - 2026 LA - en ER -
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