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| Analysis on the Cause of Longitudinal Crack on the Hot-Rolled Ribbed Bar Surface |
| FAN Jun1，ZHAO Jun-xue1，CHEN Yuan-ping2，ZHAI Ke-yong1，Li Hui-juan1 |
（1. School of Metallurgical Engineering， Xi’an University of Architecture and Technology， Shaanxi Xi’an 710055， China
2. Haixin Iron and Steel Group Co., Ltd.， Shanxi Wenxi 043801， China） |
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Abstract To find the main reason of longitudinal crack on HRB335 hot-rolled ribbed bar surface in cold bending process, continuously cast product macro-acid etching test，metallographic examination，scanning electron microscope and EDAX were carried out . It is regarded that the defect is mainly caused by serious subsurface blowholes and internal cracks in the cast product, which run through the surface in the later hot working process and is oxidized. As a result, the defects can not be welded in the rolling process and the cracks happen finally. The causes of subsurface blowhole and cracks in the production process were discussed, and some suggestions to improve the production process were given.
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Received: 03 November 2010
Published: 20 February 2012
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ZHAO Hai-sheng，ZHU Hai-feng. Causes analysis of cold bending cracking of Q195 hot rolled strip[J]. PHYSICS EXAMINATION AND TESTING, 2020, 38(2): 36-. |
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XIA Bing，CHEN Bin，HOU Zong-bao，ZHAO Zhi-hai. Cause analysis of cold bending cracking of Q235B H-beam steel[J]. PHYSICS EXAMINATION AND TESTING, 2020, 38(2): 45-. |
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LIU Jin-hua，LIAO Li. Performance change of HRB400 hot-rolled reinforced bar in natural aging and stacking aging[J]. Chinese Journal of Iron and Steel, 2016, 34(2): 16-19. |
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ZHANG Hao,ZHANG Guang-yong,PAN Shi-qun. Effect of Spray Cooling on Properties of HRB400 Hot-Rolled Ribbed Bars[J]. Chinese Journal of Iron and Steel, 2014, 26(12): 32-35. |
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ZHOU Gang,ZHANG Jia-xiang,CAI Xiao-xia,GAO Chang-yi. Cold Bending Fracture of HRB400 Screw Thread Steel Bar[J]. Chinese Journal of Iron and Steel, 2013, 31(6): 36-40. |
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YANG Jian-ping,ZHAO Ya-juan. Cause of Cold Bending Fracture of A36 Steel Plate[J]. Chinese Journal of Iron and Steel, 2013, 31(6): 32-35. |
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2012, Vol. 47 
