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| Effect of aluminum on composition control and inclusion formation of microalloyed steel containing titanium |
| QI Weiwei 1，SUN Jianwei 1，LIU Hongyin 1，YANG Xu 1，KANG Jia 2，YANG Hongbo 2 |
1. Technical Center, Laiwu Branch of Shandong Iron & Steel Co., Ltd., Jinan 271100, China；
2. School of Metallurgical Engineering，Xi′an University of Architecture and Technology，Xi′an 710055， China |
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Abstract Microalloyed steels containing titanium with different Al contents were designed independently, and the chemical composition of each furnace steel was detected by spark source photoelectric direct reading spectrometer. The influence of Al, O and Ti contents in the tested steel was analyzed. Optical microscope (OM) and scanning electron microscope (SEM) were used to observe the morphology of inclusions, and energy spectrum analysis was carried out to study the influence of Al content on the formation of inclusions. The results show that with the increase of Al content, Ti oxide inclusions in steel gradually decrease.Ti mainly exists in the form of TiN and TiC, and the rendimiento of Ti was increased. When Al content was higher than 0.033 7%, the rendimiento of Ti was higher than 90%.When the Al content was controlled at 0.033 7%-0.060 6%, the de-oxidation effect was good, and the number and size of inclusions were reduced.
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Received: 16 August 2021
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2022, Vol. 40 
