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| Influence of submerged nozzle structure on large-size continuous casting round billet quality |
| ZHANG Hong-cai1,2, YIN Chuan-lei1,2, ZHENG Li-ning1,2, ZHAI Wan-li1,2, SHI Ke-wei1,2, ZHANG Yi-min3 |
1. Technology Center, Huaigang Special Steel Co., Ltd., Jiangsu Shagang Group, Huai′an 223002, Jiangsu, China;
2. Key Laboratory of Special Steel New Materials for Rail Traffic of Jiangsu Province, Huai′an 223002, Jiangsu, China;
3. Steelmaking Works, Huaigang Special Steel Co., Ltd., Jiangsu Shagang Group, Huai′an 223002, Jiangsu, China |
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Abstract In order to study the influence of submerged nozzle with different structures on the quality of large-size continuous casting round billet, the effect of side hole submerged nozzle and traditional straight submerged nozzle on the production of 42CrMo continuous casting round billet with the section diameter of 500 mm was studied. The results show that water temperature difference between the inlet and the outlet of mould increases from 3.30 ℃ to 3.54 ℃ when side hole submerged nozzle is used. The central porosity of continuous casting round billet is improved from grade 1.5 to 1.0, the central segregation index decreases from 0.93~1.21 to 0.98~1.02, and the carbon range from near surface to near center decreases from 0.050%~0.075% to 0.035%~0.053%. The carbon segregation of continuous casting round billet is improved by side hole submerged nozzle. The total amount of oxide inclusions decreases by 0.5/mm2 from the surface layer of inner arc side to 3/4R. The quantity of sulfide bigger than 13 μm from 1/4R inward decreases by 0.35/mm2; The total oxygen mass fraction of rolled steel is reduced by 0.000 12% on average, the B-type oxide inclusion in inclusions is all within grade 1.5, large size inclusions are reduced obviously, and the cleanliness of the steel is improved.
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Received: 24 March 2022
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2022, Vol. 32 
