Investigation on inclusions and breakages in ultra-deep drawing wire rod
WANG Kun-peng1, WANG Ying2, LIAO Jia-ming1, XU Jian-fei1, JIANG Min3, WANG Xin-hua3
1. Technology Center, Zenith Steel Group Co., Ltd., Changzhou 213011, Jiangsu, China; 2. Zenith Special Steel Co., Ltd., Changzhou 213011, Jiangsu, China; 3. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
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.
王昆鹏, 王郢, 廖家明, 徐建飞, 姜敏, 王新华. 超深拉拔类线材夹杂物及断口分析[J]. 钢铁, 2022, 57(2): 101-108.
WANG Kun-peng, WANG Ying, LIAO Jia-ming, XU Jian-fei, JIANG Min, WANG Xin-hua. Investigation on inclusions and breakages in ultra-deep drawing wire rod[J]. Iron and Steel, 2022, 57(2): 101-108.
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2022, Vol. 57 
