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Research banded pipeline steel continuous casting process

Author: ZouZhongQin
Tutor: YangHua；XuHongQing
School: Shandong University
Course: Materials Science and Engineering
Keywords: Pipeline steel Banded structure Soft Reduction in the amount of Drawing speed Final rolling temperature The rolling after cooling speed
CLC: TG249.7
Type: Master's thesis
Year: 2005
Downloads: 395
Quote: 1
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Abstract

The banded structure is the main factor to affect the intrinsic quality of the steel, it destroys the continuity of the steel, and had a negative impact on performance. To do this, we must strengthen the sources of pipeline steel banded structure, distribution patterns, and some of the process parameters of pipeline steel in the continuous casting and rolling process analysis and to propose appropriate control measures. The subject in the X52, X60 pipeline steel plate the entire production process, through different means of testing and analysis methods, the performance behavior of steel strip continuous casting and rolling process the form and level of the organization change systematic and comprehensive analysis and research. The subject for Jinan Iron and Steel Group Corporation development pipeline steel, has a very important significance and practical significance. In order to study the impact of the Mo banded pipeline steel, steel for the first time joined the molybdenum. After the study found that the banded structure is still heavy, but the photos look to be much lighter, (an increase in the number, but the bandwidth is reduced). More refined steel microstructure uniform, 12 grain, mixed grain structure is greatly reduced. Banded structure improved. The level of the non-metallic inclusions, the ferrite grains are reached the standard requirements, specifications for 14mm grain size uniformity than 18mm. In order to study the amount of soft reduction in continuous casting process and the drawing speed of the banded pipeline steel, using different drawing speed and soft reduction amount, the experimental results show that: the application of continuous casting soft reduction technology to reduction or elimination of the central segregation and center porosity has a very important practical significance; there is a great difference in the before and after the application soft reduction technology and pull-up speed was increased, the degree of segregation of carbon. Higher pulling speed and the larger the amount of the soft reduction, the degree of segregation of carbon is low; lower pulling speed and a smaller amount of soft reduction, the larger the degree of segregation of the carbon in the steel; appropriate pull speed increase billet casting process, will help to improve the structure of the internal microstructure of pipeline steel. In order to study the final rolling temperature and cooling rate after rolling banded pipeline steel investigated using different temperature and speed, comparing experimental results found: finish rolling temperature banded structure is due to changes in the relative grain size δd caused. The test results show that when the ΔD LT; -04 hours, the final rolling temperature is low, the strip alleviate; When ΔD GT; -04 hours, the final rolling temperature is high, the strip alleviate; rolled steel sheet strip tissue density with the increase in the cooling rate reduced, if the cooling rate reaches a certain value (critical cooling speed), the band structure disappear.

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