Abstract:Stainless steel requires high surface quality of cold plate, and inclusions are one of the main reasons for surface defects during rolling. In order to clarify the effect of inclusions on surface defects in rolling process, the deformation characteristics of two typical inclusions, hard magnesia alumina spinel and low melting point silicate, during hot rolling, annealing and cold rolling were studied through pilot scale simulation experiments, and the deformation mechanism of inclusions during cold rolling was analyzed by numerical simulation. The results show that the high melting point magnesia alumina spinel does not deform during hot rolling, and the low melting point silicate inclusions are semi molten at the hot rolling temperature of 1 200-1 250 ℃, which has good deformation ability. Silicate inclusions have high aspect ratio and low tensile strength, so it is easier to fracture and extend during cold rolling. With the progress of rolling, the distance of inclusions after fracture gradually increases and the size decreases. On the contrary, magnesia alumina spinel is not easy to fracture and extend, and there is a critical size of fracture and extension, which decreases with the increase of cold rolling deformation. As magnesia aluminum spinel is easy to cause stainless steel rolling defects, its formation should be avoided or its particle size should be controlled in the production process.
翟俊, 郎炜昀, 杨永杰. 不锈钢典型夹杂物在轧制过程的衍变分析[J]. 中国冶金, 2023, 33(1): 123-130.
ZHAI Jun, LANG Wei-yun, YANG Yong-jie. Analysis for evolution of typical inclusions in stainless steel during rolling[J]. China Metallurgy, 2023, 33(1): 123-130.