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| Evolution of oxide inclusions in Si-killed 304 stainless steel during cold rolling |
| GAO Jin-guo1， ZHANG Xue-liang2， YANG Shu-feng2， LI Jing-she2，
ZHAI Jun3， HAO Wei-xing2 |
| （1. International Department， Xinxing Ductile Iron Pipes Co.， Ltd.， Beijing 100020， China； 2. School of Metallurgical and Ecological Engineering， University of Science and Technology Beijing， Beijing 100083， China；
3. Technology Center， Shanxi Taigang Stainless Steel Co.， Ltd.， Taiyuan 030003， Shanxi， China） |
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Abstract In order to achieve effective control of inclusions in solid-state steel during cold rolling，the hot rolled plates of 304 stainless steel deoxidized by Si were cold rolled into different thicknesses through multi-pass rolling process，and the deformation of oxide inclusions during cold rolling was investigated by a scanning electron microscope. The experimental results show that the inclusions in Si-killed 304 stainless steel were mainly low melting point SiO2-CaO-MnO-Al2O3. The morphology of these inclusions in hot rolled plates were mainly long-strip. During cold rolling process，the long-stripe oxide inclusions with 3.0 to 23.0 μm in length were fractured and changed into finer inclusions with 0.5 to 3.0 μm in size. The size of the small fractured particles gradually decreased with increasing cold rolling reduction. When the size of the fractured particles was reduced to about 0.5 μm，the particles were not fractured anymore. The distances among the fractured particles were not concerned with original length of the inclusions， which were determined by the elongation of cold rolled plates.
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Received: 02 November 2018
Published: 15 February 2019
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2019, Vol. 54 
