Study on inclusions and microstructure of 55SiCrA spring steel wire rod

Wang Ning; Peng Hongbing; Tang Yao; Xie Zhen; Chen Kai

doi:10.7513/j.issn.1004-7638.2021.01.023

Volume 42 Issue 1

Feb. 2021

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Wang Ning, Peng Hongbing, Tang Yao, Xie Zhen, Chen Kai. Study on inclusions and microstructure of 55SiCrA spring steel wire rod[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(1): 144-149. doi: 10.7513/j.issn.1004-7638.2021.01.023

Citation:

Wang Ning, Peng Hongbing, Tang Yao, Xie Zhen, Chen Kai. Study on inclusions and microstructure of 55SiCrA spring steel wire rod[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(1): 144-149. doi: 10.7513/j.issn.1004-7638.2021.01.023

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Study on inclusions and microstructure of 55SiCrA spring steel wire rod

doi: 10.7513/j.issn.1004-7638.2021.01.023

School of Metallurgical and Materials Engineering, Jiangsu University of Science and Technology, Zhangjiagang 215600, Jiangsu, China

Received Date: 2020-05-28
Publish Date: 2021-02-10

Abstract

Abstract

Inclusions and microstructure of 55SiCrA spring steel wire rod were studied by means of OM, SEM-EDS and Factsage software. The results show that the microstructure, central segregation, thickness of decarburized layer and grain size of spring steel wire rod in the three plants at home and abroad are almost the same. Moreover, the level 1 D-type inclusions and the level 1.5 Ds-type inclusions are found in domestic steel Y (DSY), however, no Ds-type inclusions are found in foreign steel H (FSH) and domestic steel B (DSB). The number of inclusions in spring steel of FSH is the least and their size is the smallest, the maximum size is only 3.4 μm, and the deformable ratio is nearly 100%; however, the inclusions in spring steel wire rod of DSY and DSB are large in number and size, and are not deformable. The average contents of Al₂O₃ and MgO are higher in inclusions of DSY, and pure Al₂O₃ inclusions are found in the wire rod of DSB. In addition, for domestic steel mills it is necessary to further control the composition of molten steel and refined slag, improve the quality of refractory materials and select refractory materials reasonably to enhance the modification and removal of inclusions.
- spring steel,
- wire rod,
- microstructure,
- inclusion

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References(13)

References

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