Effect of solidification structure on banded defects of high strength corrosion resistant tubes
LI Bo1, YANG Fei-fei1, LIU Hua-song1, LUO Ming2, ZHANG Zhong-hua2, ZHANG Jia-quan1
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Tube and Pipe Department, Baosteel Research Institute, Baoshan Iron and Steel Co., Ltd., Shanghai 201900, China
Abstract:As-cast spot segregation is the origin of banded defects in oil tube products,which will be harmful to the corrosion resistance of the tubes in service. The influence of solidified structure on the large banded defects in hot rolled and QT tubes was studied based on the C110 steel for controlling the banded defects. The results show that the spot segregation exists in the center equiaxed crystal region,which has a fine secondary dendritic structure but with severe speckle like segregation. The spot segregation will be inherited into the hot rolled tubes and appear as wide band defects. Such banded defects are difficult to remove by heat treatment and therefore inherited into the final QT products. Reducing the equiaxed crystal zone in the round castings is beneficial to control the formation and growth of the spot segregation,thereby significantly reducing the large band defects in the hot rolled and QT tubes. The hardness measurement results show that the hardness uniformity of both hot rolled and QT tubes can be obviously improved with the decrease of the as-cast center equiaxed crystal area.
李博, 杨飞飞, 刘华松, 罗明, 张忠铧, 张家泉. 凝固组织对高强耐蚀管带状缺陷的影响[J]. 钢铁, 2020, 55(3): 87-95.
LI Bo, YANG Fei-fei, LIU Hua-song, LUO Ming, ZHANG Zhong-hua, ZHANG Jia-quan. Effect of solidification structure on banded defects of high strength corrosion resistant tubes. Iron and Steel, 2020, 55(3): 87-95.
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