Microstructure and Properties of Aluminum-Silicon Weathering Steel Prepared by Strain Induced Ferrite Transformation Rolling

LI Wenyuan; LIU Kun; HUI Yajun; LIU Jie; ZHANG Xu; IU Xiaocui

doi:10.11973/jxgccl201909007

Materials and Mechanical Engineering > 2019 > 43(9): 33-37,72. > DOI: 10.11973/jxgccl201909007

LI Wenyuan, LIU Kun, HUI Yajun, LIU Jie, ZHANG Xu, IU Xiaocui. Microstructure and Properties of Aluminum-Silicon Weathering Steel Prepared by Strain Induced Ferrite Transformation Rolling[J]. Materials and Mechanical Engineering, 2019, 43(9): 33-37,72. DOI: 10.11973/jxgccl201909007

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Microstructure and Properties of Aluminum-Silicon Weathering Steel Prepared by Strain Induced Ferrite Transformation Rolling

1. Strip Technology Department, Shougang Research Institute of Technology, Beijing 100043, China;
2. Laboratory of Green Recyclable Process for Iron & Steel Production Technology, Beijing 100043, China;
3. Shougang Co. Ltd Qian'an Steel Corp, Qian'an 064404, China

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Received Date: May 09, 2018
Revised Date: June 24, 2018

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Strain induced ferrite transformation rolling process of a homemade aluminum-silicon weathering steel was determined by measuring its continuous cooling transformation curve and then was applied to the tested steel. The microstructure, mechanical properties and corrosion resistance of the rolled tested steel in 3.5wt% NaCl solution were studied and compared with those of SPA-H steel. The results show that only ferrite and pearlite transformation zones existed in the tested steel at cooling rates of 0.5-25℃·s^-1. After rolling, the microstructure consisted of single ferrite, and the grain size of some ferrite was less than 3 μm. Comparing with SPA-H steel, the tested steel had higher elongation and lower yield ratio; also the impact toughness was excellent. After corrosion in NaCl solution, multiple dense Al- and Si-enriched layers existed in the rust layer on surface of the tested steel, and the surface rust layer had better corrosion resistance than the surface rust layer of SPA-H steel had, so the resistance to chloride ion corrosion of the tested steel was better than that of SPA-H steel.

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