Factors of Cracking in Q355B Cold-rolled Galvanized Steel Sheets During Bending

WANG Yuanyong; XU Yingchun; GAO Guangyong; JIANG Yueyue; DAI Qingwei

doi:10.3969/j.issn.1674-6457.2025.10.009

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (10) : 95-102. DOI: 10.3969/j.issn.1674-6457.2025.10.009

Iron and Steel Forming

Factors of Cracking in Q355B Cold-rolled Galvanized Steel Sheets During Bending

WANG Yuanyong^1,2, XU Yingchun², GAO Guangyong¹, JIANG Yueyue^1,2,*, DAI Qingwei^2,*

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Abstract

The work aims to investigate the factors of frequent bending cracking in Q355B during the forming process. With Q355B cold-rolled galvanized sheets as the research object, macroscopic and microscopic characterization techniques, including microstructure observation, energy-dispersive spectroscopy (EDS) analysis, and Vickers microhardness testing, were employed to compare and analyze the microstructure, inclusion distribution, chemical composition, and hardness properties of cracked samples and normal samples. The results revealed that the cracked samples exhibited more pronounced banded structures in the rolling direction. Both cracked and normal samples showed similar quantities of elongated inclusions on their surfaces, with EDS analysis confirming these inclusions as MnS. Observation of the fracture surfaces of the cracked samples identified the presence of large-sized Al₂O₃ inclusions. Additionally, significant copper (Cu) segregation was observed on both the macroscopic surfaces and microscopic structures of the cracked samples. Vickers microhardness testing indicated that the overall hardness of the cracked samples was higher than that of the normal samples. In conclusion, banded structure and large-sized inclusions are among the causes of bending cracking in Q355B steel. Furthermore, the significant segregation of Cu on the macroscopic surface and within the microstructure is identified as a key factor that exacerbates the material's tendency to crack.

Key words

Q355B / bending cracking / banded structure / inclusions / copper segregation

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WANG Yuanyong, XU Yingchun, GAO Guangyong, JIANG Yueyue, DAI Qingwei. Factors of Cracking in Q355B Cold-rolled Galvanized Steel Sheets During Bending[J]. Journal of Netshape Forming Engineering. 2025, 17(10): 95-102 https://doi.org/10.3969/j.issn.1674-6457.2025.10.009

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Funding

Natural Science Foundation of Chongqing Municipality (CSTB2022NSCQ-MSX1442); Technical Research Project of Chongqing Municipality Education Commission (KJQN202201538); Chongqing Natural Science Foundation (CSTB2022NSCQ- LZX0054)