scholarly journals The Optimal Design for the Production of Hot Rolled Strip with “Tight Oxide Scale” by Using Multi-objective Optimization

2011 ◽  
Vol 51 (9) ◽  
pp. 1468-1473 ◽  
Author(s):  
Tao Jia ◽  
Zhenyu Liu ◽  
Hengfa Hu ◽  
Guodong Wang
Keyword(s):  
Optimal Design ◽  
Oxide Scale ◽  
Rolled Strip ◽  
Multi Objective Optimization ◽  
Multi Objective ◽  
Hot Rolled Strip ◽  
Hot Rolled

Effect of Temperature on Structure and Corrosion Resistance of Oxide Scale on Hot Rolled Strip

2010 ◽  
Vol 152-153 ◽  
pp. 229-237
Author(s):  
Xian Liang Zhou ◽  
Min Zhu ◽  
Xiao Zhen Hua ◽  
Zhi Guo Ye ◽  
Qing Jun Chen
Keyword(s):  
Oxide Scale ◽  
Electrochemical Impedance ◽  
Effect Of Temperature ◽  
Rolled Strip ◽  
X Ray Diffraction ◽  
Hot Rolled Strip ◽  
Treatment Processes ◽  
Different Temperatures ◽  
Coiling Process ◽  
Hot Rolled

Various structure scales at the surface of SS400 hot rolled strip were fabricated by heat treatment processes involving different temperatures. A simulation about the effect of various temperatures on the oxide scale structure during the coiling process was carried out. The structure and corrosion behavior of different oxide scales formed at the surface of hot rolled strip were investigated in sodium bisulfite (NaHSO3) solution by scanning electron microscope (SEM), X-ray diffraction (XRD), polarization curves and electrochemical impedance spectroscopy (EIS). The scale prepared at 550 °C is mainly composed of one layer of Fe3O4 phase. The scales prepared at 600 °C and 700 °C consist of the outer thin Fe2O3 layer and the inner (Fe3O4+Fe particles) layer. The scale prepared at 650 °C is mainly composed of Fe3O4 phase as well as a spot of Fe2O3 phase. The thickness of scale prepared at 650°C is observed to be more homogeneous than that of other scales and the bonding between the scale and substrate is found to be very strong. The experimental results clearly reveal that the hot rolled strip with scale prepared at 650 °C exhibits the most excellent corrosion resisting property in 0.01 mol/L NaHSO3 solution.

Reduction of oxide scale on hot-rolled strip steels by carbon monoxide

2008 ◽  
Vol 62 (20) ◽  
pp. 3500-3502 ◽  
Author(s):  
Shi Jie ◽  
Wang De-ren ◽  
He Ye-dong ◽  
Qi Hui-bin ◽  
Wei Gao
Keyword(s):  
Carbon Monoxide ◽  
Oxide Scale ◽  
Rolled Strip ◽  
Hot Rolled Strip ◽  
Hot Rolled

scholarly journals Effect of Coiling Temperature on Oxide Scale of Hot-Rolled Strip

2011 ◽  
Vol 415-417 ◽  
pp. 853-858 ◽  
Author(s):  
Xiang Long Yu ◽  
Zheng Yi Jiang ◽  
Xiao Dong Wang ◽  
Dong Bin Wei ◽  
Quan Yang
Keyword(s):  
Phase Composition ◽  
Oxide Scale ◽  
Low Carbon Steel ◽  
Rolled Strip ◽  
Low Carbon ◽  
Hot Strip Rolling ◽  
Coiling Temperature ◽  
Strip Rolling ◽  
Hot Rolled Strip ◽  
Hot Rolled

The influence of the coiling temperature, ranging from 550 to 570°C, on the morphology and the phase composition of the oxide scale formed on the microalloyed low carbon steel for automobiles after hot strip rolling was investigated. Physicochemical characteristics of the oxide scales were examined and their formation mechanism was discussed. Thickness of the oxide scale is in the range of 8-11µm and decreases with a decrease of coiling temperature. The microstructure and phase composition, XRD analysis shows a large amount of magnetite (Fe3O4) and some sparse hematite (Fe2O3) exist on the surface of hot rolled strip when the coiling temperature reduces from 570 to 550°C. The coiling temperature substantially affects the internal microstructure and magnetite phase.

scholarly journals Effect of oxide scale structure on shot-blasting of hot-rolled strip steel

2020 ◽  
Vol 2 ◽  
pp. e9
Author(s):  
Xiaochen Wang ◽  
Rui Ai ◽  
Quan Yang ◽  
Shang Wang ◽  
Yanjie Zhang ◽  
...  
Keyword(s):  
Oxide Scale ◽  
Storage Time ◽  
Rolled Strip ◽  
X Ray Diffraction ◽  
Shot Blasting ◽  
Strip Surface ◽  
Hot Rolled Strip ◽  
On Line ◽  
Hot Rolled ◽  
Storage Times

Background The effect of oxide scale composition of hot-rolled strip (Q235) on shot blasting is studied in this article. The properties of the oxide scale on the strip surface change during storage. The shot blasting is an important on-line acid-less descaling technology. The effect of shot blasting is affected by many factors, among which the composition of oxide scale may play an important role. However, there are few studies on the relationship between the oxide layer content and the descaling effect. Methods The morphologies of oxide scales at different storage times are observed by scanning electron microscopy (SEM), and the compositions are analyzed by X-ray diffraction. These strips are then shot blasted and descaled with different amounts of abrasive, and the descaling effects are compared by SEM. Results The results show that the eutectoid structure Fe3O4/Fe in the oxide scale will gradually transform into Fe3O4. In the case of short storage time, the content of the eutectoid structure is high, and it is difficult to remove the oxide scale. While the strip with a long storage time has no eutectoid structure Fe3O4/Fe and FeO, it is easy to remove the oxide scale during the shot blasting process. The composition of the oxide scale has a significant effect on the effect of shot blasting, and it provides significant guidance to the optimization of the descaling process parameters.

Hot-rolled strip re-reddening temperature changing law for late ultra fast-cooling in a CSP line

2015 ◽  
Vol 112 (3) ◽  
pp. 305 ◽  
Author(s):  
Lian-yun Jiang ◽  
Guo Yuan ◽  
Jian-hui Shi ◽  
Yue Xue ◽  
Di Wu ◽  
...  
Keyword(s):  
Rolled Strip ◽  
Hot Rolled Strip ◽  
Ultra Fast Cooling ◽  
Fast Cooling ◽  
Hot Rolled
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