|
|
|
| Hot-dip Galvanizing of Carbon Steel after Cold Rolling with Oxide Scale and Hydrogen Descaling |
| Yong-quan HE1,Tao JIA1,Xiao-jiang LIU1,Guang-ming CAO1,Zhen-yu LIU1,Jun LI1,2 |
1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819,Liaoning, China
2. Baosteel Research Institute, Shanghai 201900, China |
|
|
|
|
Abstract A new processing method for producing hot-dip galvanized steel is designed and tested, in which pickling is skipped. Hot-rolled low carbon steel sheets are rolled with oxide scale in an experimental mill at room temperature, prior to annealing under a 20% hydrogen reducing atmosphere and galvanizing on a hot-dip galvanizing simulator. Micro-cracks formed in the oxide scale during cold rolling roughen the steel surface and enlarge the specific surface. Through-thickness cracks provide transport channels for hydrogen, and hence the reduction of oxide scale is enhanced. When the sheet is dipped in the zinc bath, cracks are submerged by liquated zinc and the defects are not distinct after hot-dip galvanizing. The overlay coating occludes with rough surface of the sheet, whereby a superior coating adherence is realized.
|
|
Received: 30 July 2012
Published: 20 February 2014
|
|
Corresponding Authors:
HE
E-mail: he284655@hotmail.com
|
|
|
|
| [1] |
Hui-bin WU,Di WANG,Peng-cheng ZHANG,Jin-ming LIANG,Sheng LIU,Di TANG. Influences of Alloying Elements on Oxidation Behavior of Steels and Microstructure of Oxide Scales[J]. Chinese Journal of Iron and Steel, 2016, 23(3): 231-237. |
| [2] |
Yang-bo LIU,,Wei ZHANG,Qian TONG,Qi-song SUN. Effects of Si and Cr on Complete Decarburization Behavior of High Carbon Steels in Atmosphere of 2 vol.% O2[J]. Chinese Journal of Iron and Steel, 2016, 23(12): 1316-1322. |
| [3] |
Xiao-chen WANG,Quan YANG,You-zhao SUN. Rectangular Section Control Technology for Silicon Steel Rolling[J]. Chinese Journal of Iron and Steel, 2015, 22(3): 185-191. |
| [4] |
Jin-shan CHEN, Chang-sheng LI. Prediction and Control of Thermal Scratch Defect on Surface of Strip in Tandem Cold Rolling[J]. Chinese Journal of Iron and Steel, 2015, 22(2): 106-114. |
| [5] |
Guang-ming CAO, Teng-zhi WU, Rong XU, Zhi-feng LI, Fu-xiang WANG, Zhen-yu LIU. Effects of Coiling Temperature and Cooling Condition on Transformation Behavior of Tertiary Oxide Scale[J]. Chinese Journal of Iron and Steel, 2015, 22(10): 892-896. |
| [6] |
Xin ZHANG,Shu-zong CHEN,Hao-yu ZHANG,Xi-wen ZHANG,Dian-hua ZHANG,Jie SUN. Modeling and Analysis of Interstand Tension Control in 6-high Tandem Cold Rolling Mill[J]. Chinese Journal of Iron and Steel, 2014, 21(9): 830-836. |
|
|
|
|
2014, Vol. 21 
