Analysis of DWTT property of thick X70 pipeline steel |
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Authors: | AN Cheng- gang NIU Tao WU Xin- lang JIANG Yong- wen DAI Xiao- li |
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Affiliation: | 1.Shougang Research Institute of Technology, Beijing 100043, China ; 2.Beijing Engineering Research Center of Energy Steel, Beijing 100043, China ;3.Shougang Qian??an Steel Company, Qin??an 064404, Hebei, China |
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Abstract: | The microstructures of X70 pipeline steels with different thickness specifications and different rolling reduction ratios were analyzed by metallographic microscope, scanning electron microscope, and electron backscatter diffraction techniques, and the original austenite microstructures were compared. The effect of compression ratio on the original austenite structure was studied. The results show that the large compression ratio in the rolling process is more conducive to refine austenite grains and improve the low- temperature toughness of thick X70 pipeline steel. However, due to the fact that the temperature during the finish rolling process is too low to permeate the center of the deformation, it is necessary to further use the low- temperature stage of the rough rolling process to perform deformation infiltration. Ultra- rapid cold cooling after rolling can improve the DWTT performance of the steel, but it is not sufficient to compensate for the fluctuation of DWTT performance caused by insufficient early austenite grain refinement. |
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Keywords: | DWTT X70 thickness low-temperature toughness |
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