Annealing process of high-strength hot-dip galvanized structural steel SGC570

doi:10.13251/j.issn.0254-6051.2022.08.037

Abstract

Abstract: In accordance with the technical requirements of high-strength hot-dip galvanized structural steel SGC570, a process route of C-Mn chemical composition system, hot continuous rolling+cold rolling+continuous annealing hot-dip galvanizing was selected to study its continuous annealing process. Through thermal simulated annealing experiment, tensile test, hardness test, microstructure observation, it is found that the recrystallization temperature of high-strength hot-dip galvanized structural steel SGC570 product is 550 ℃. In order to improve the yield strength, incomplete annealing process is performed between 530-540 ℃. In the industrial small batch trial production stage, the continuous annealing process is studied by analyzing the relationship between annealing temperature and product microstructure and properties, and it is concluded that the best annealing temperature for industrial production is 530 ℃.

Key words: hot-dip galvanized structural steel, continuous annealing, high strength, thermal simulation, industrial trail production

CLC Number:

TG142.1

Li Peng, Li Renjie, Yang Xiong, Huang Li. Annealing process of high-strength hot-dip galvanized structural steel SGC570[J]. Heat Treatment of Metals, 2022, 47(8): 223-227.

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