Transactions of Materials and Heat Treatment

Title：Development on niobium-containing automotive structural steel produced by thin slab continuous casting and rolling

Authors： Yang Li1 Dong Xinxin1 Liu Liping2

Unit： 1.Department of Materials Engineering Tangshan Vocational College of Science and Technology 2.Technical Center of Tanshan Iron & Steel Group Co. Ltd.

KeyWords： thin slab continuous casting and rolling high temperature thermoplasticity casting powder niobium titanium microalloyed controlled rolling and controlled coding

ClassificationCode：TG161

year,vol(issue):pagenumber：2022,47(6):148-152

Abstract：

Focusing on the production of niobium-containing automotive structural steel by thin slab continuous casting and rolling,relevant research work and industrial practice were carried out

combined with the product technical requirements of hot-rolled automotive structural steel S355MC and S420MC selecting from the European standard and the role of alloy elements in the steel, the composition system of low-carbon, low-silicon, high-manganese and niobium-titanium microalloyed was determined. The smelting process system was determined according to the composition characteristics of the product, the converter adept metal manganese with manganese to effectively avoid the increase of silicon and carbon, and LF adept medium carbon ferromanganese for fine adjustment. At the same time, the converter was required to tap at high temperature. The law of high temperature plasticity for S355MC and S420MC steels changed with the temperature was obtained from the high temperature plasticity experiment, it was determined that the continuous casting adept high basicity casting powder, and weak cooling mode was used in the secondary cooling. The key process control points such as slab heating temperature,rough rolling outlet temperature,final rolling temperature and colling tempereoture were deterimined according to the precipitation law and phase transformation mechanism of microalloyed elements in the process of controlled rolling and controlled coding, so that the structure and properties of products were effectively controlled.

Funds：

河北省高等学校科学研究项目（QN2021411）

杨丽（1983-），女，硕士，副教授 E-mail：tsyangli2009@163.com 通信作者：董欣欣（1977-），女，硕士，副教授 E-mail：tgdongxin@sina.com

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