Study on the Large Inclusions in 20g Steel

Abstract:

According to the production process of 20g steel(120t BOF→ LF→ CC), some system analysis are introduced to research on the content of T[O] and [N] and the type, source, composition and quantity of micro inclusions in refining process, pouring process and casting billet. The results of the study show: in billet, the main type of large inclusions is CaO-SiO2-Al2O3-MgO complex inclusion of sulfur contained. The content of large inclusions is 14.5mg/10kg in normal billet. The content of large inclusions is 33.14mg/10kg in compound casting billet which is 1.29 time than normal billet.The content of large inclusions whose particle size is more than 300μm in billet is 8.39mg/10kg, and make up 87% of the total. The content of large inclusions whose particle size is 140-300μm in billet is 2.29mg/10kg, and make up 15.79% of the total. The content of large inclusions whose particle size is 80-140μm in billet is 3.82mg/10kg, and make up 26.35% of the total. Unsteady casting plays an important role in the steel cleanliness.

• Periodical: Advanced Materials Research (Volumes 634-638)
• Pages: 1874-1878
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.634-638.1874
• Online since: January 2013
• Authors: Li Guang Zhu, Ruo Si Wang, Cheng Liang Du
• Keywords: 20g Steel, Large Inclusion, Unsteady Casting

References

[1] Yanhui Sun, Kaike Cai, Changliang Zhao. Effect of transient casting operation on cleanliness of continuously cast strands[J]. Iron and Steel, 2008, 43(1): 22-25, In chinese

[2] Yupo Feng. Effects of non-Steady state casting on surface longitudinal crack of wide slab and their control[J]. Wide and Heavy Plate, 2012, 18(1): 22-24, In chinese