超深拉拔类线材夹杂物及断口分析

doi:10.13228/j.boyuan.issn0449-749x.20210457

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Abstract For inclusion control of ultra-deep drawing wire rod (for tire cord, saw wire and diamond wire saw, etc.), three different control ideas of inclusion (low melting point, homogenization and low elastic modulus) of ultra-deep drawing steel were chosen in this paper. Plastic deformation and crush behavior of 4 types typical oxide inclusions (SiO₂, SiO₂-Al₂O₃-MnO, SiO₂-CaO-Al₂O₃-(MgO) and SiO₂-CaO-MgO-(Al₂O₃)) were studied during hot rolling and drawing in ultra-deep drawing wire rod by scanning electron microscope. The general characteristics of inclusions in twist fracture of tire cord and wet drawing fracture of cutting steel wire and electroplate diamond wire saw busbar were examined and summarized. The results show that the crystalline SiO₂ inclusion cannot deform in the hot rolling process while plastic deformation occurred in glassy SiO₂ inclusion. Both the crystalline and glassy SiO₂ inclusion can be crushed into pieces during the drawing process. SiO₂-CaO-Al₂O₃-(MgO) inclusions with low melting point transformed into long strip shape in hot rolling and also crushed into pieces during the drawing process. The deformation of SiO₂-Al₂O₃-MnO and SiO₂-CaO-MgO-(Al₂O₃) inclusions with low Young′s modulus in hot rolling was not sufficient, but these two inclusions also crushed into pieces in drawing process. Long-term statistical analysis of a large number of fractures shows that the main inclusions causing wire breakage of ultra-deep drawing wire are Al-Mg-(Mn)-O spinel (38.2%), Al-O corundum (32.0%), Al-Si-O mullite (21.9%), a small amount of Mg-Si-(Mn)-O olivine (6.3%) and very few Zr-O inclusions (1.6%). The fracture inclusions have the characteristics of high melting point and high elastic modulus. The sources of these inclusions are mostly related to refined or continuous casting refractories. No inclusion with low melting point and low elastic modulus or high melting point and low elastic modulus has been found on the fracture. “Homogenization” of endogenous inclusions and “low elastic modulus” of external inclusions are the controlling directions of oxide inclusions in ultra-deep drawing wires.

Key words： inclusion hot rolling drawing breakage plasticity crush

Received: 09 August 2021

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	Articles by authors
	WANG Kun-peng
	WANG Ying
	LIAO Jia-ming
	XU Jian-fei
	JIANG Min
	WANG Xin-hua

Cite this article:

WANG Kun-peng,WANG Ying,LIAO Jia-ming等. Investigation on inclusions and breakages in ultra-deep drawing wire rod[J]. Iron and Steel, 2022, 57(2): 101-108.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210457 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I2/101

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