Summary
A continuous casting process for high-alloy steels such as 13% Mn steel, 9% Ni steel, and stainless steels (AISI 631, AISI 310S) has been developed at Chiba Works of Kawasaki Steel Corp. Tensile testing at elevated temperatures and microscopic examination of the fractured surface of the corresponding steel specimen have shown that the high crack sensitivity of these grades is due to segregation and/or precipitation of sulfur and phosphorus at γ-grain boundaries, and for 9% Ni steel, additional large thermal expansion at γ/α transformation.
Decreasing the content of phosphorus and sulfur, making secondary cooling milder and widthwise even, and decreasing the rate of slab reheating have been shown to improve the occurrence of surface and subsurface cracks during continuous casting and hot rolling, making commercial production of these grades feasible.
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References
S. Suzuki, Y. Nakano, K. Hirose, T. Okumura, H. Nishikawa, and M. Sato, “Production of 9% Ni Steel Plates for Liquefied Natural Gas Tanks,” Kawasaki Steel Technical Report, No. 6, September 1982, p. 31.
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Kinoshita, K., Yoshii, Y., Kitaoka, H. et al. Continuous Casting of High-Alloy Steels. JOM 36, 38–43 (1984). https://doi.org/10.1007/BF03338406
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DOI: https://doi.org/10.1007/BF03338406