Effect of calcium addition amount on cleanliness of Q355 Ti-bearing Al-killed steel

doi:10.13228/j.boyuan.issn1001-0963.20240208

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Journal of Iron and Steel Research ›› 2025, Vol. 37 ›› Issue (2) : 164-172. DOI: 10.13228/j.boyuan.issn1001-0963.20240208

Smelting and Working

Effect of calcium addition amount on cleanliness of Q355 Ti-bearing Al-killed steel

ZHANG Yachen^1,2, DENG Zhiyin^1,2, LIU Xiaofeng³, ZHU Miaoyong^1,2

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Abstract

To further understand calcium treatment technology, industrial experiments were carried out in the refining process of Q355 Ti-bearing Al-killed steel grades, and the inclusions in steel and the cleanliness of the steel were investigated considering different feeding lengths of Ca wires. The results show that the solid inclusions during the refining process transformed into the liquid CaO-Al₂O₃ inclusions, and the feeding length of calcium wires did not affect the evolution trend of the inclusions. After calcium treatment, the total oxygen content of the steel increased, while the average size of the inclusions decreased. Furthermore, both the occurrence of the large-sized CaO-Al₂O₃ inclusions and the degradation of refractory wereaggravated by calcium treatment. After ensuring steel castability, a smaller feeding length of Ca wire is beneficial for the cleanliness of the steel. If there are no castability problems, calcium treatment can even be eliminated.

Key words

calcium treatment / clean steel / inclusion / liquid phase / castability

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ZHANG Yachen, DENG Zhiyin, LIU Xiaofeng, ZHU Miaoyong. Effect of calcium addition amount on cleanliness of Q355 Ti-bearing Al-killed steel[J]. Journal of Iron and Steel Research, 2025, 37(2): 164-172 https://doi.org/10.13228/j.boyuan.issn1001-0963.20240208

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