Analysis of the nonconformance of ultrasonic testing and technology improvement for FAS2271 hot rolled steel bars

MA Qun,FENG Gui-ping,ZHAO Zhi-gang,LI Gang,GU Wen-tao,KANG Tian

Physics Examination and Testing ›› 2018, Vol. 36 ›› Issue (4) : 42-45.

Physics Examination and Testing ›› 2018, Vol. 36 ›› Issue (4) : 42-45. DOI: 10.13228/j.boyuan.issn1001-0777.20170108
Defect Analysis

Analysis of the nonconformance of ultrasonic testing and technology improvement for FAS2271 hot rolled steel bars

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Abstract

Core cracks were detected in FAS2271 hot rolled steel round bars during ultrasonic testing. Samples were then taken from non-conformance steel bars, and analyzed by metallographic microscope. The results showed that the core cracks of FAS2271 hot rolled steel round bars were mainly caused by non equalization heating during the heating of billets, and meanwhile, because the cooling speed was fast after rolling, and steel bars were directly straightened, strain overlaid, the risk of core cracking was increased. By improving the processes of billets heating and slowing the cooling process of steel bars after rolling, which included increasing the heating temperature, controlling the pulling speed of billets and adding the process of pit cooling after rolling, the nonconformance ratio of ultrasonic testing was lowered obviously from 14 percent to 0.15 percent.

Key words

Key words: FAS2271 steel / ultrasonic testing / core cracking / technology improvement

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MA Qun. Analysis of the nonconformance of ultrasonic testing and technology improvement for FAS2271 hot rolled steel bars[J]. Physics Examination and Testing, 2018, 36(4): 42-45 https://doi.org/10.13228/j.boyuan.issn1001-0777.20170108

References


[4]Fukuda S.Development of Fracture Splitting Connecting Rod [J].Society of Automotive Engineers of Japan Review,2002,23(1):101-104
[5] 杨慎华,寇淑清,谷诤巍等.发动机连杆裂解加工新技术[J].哈尔滨工业大学学报,2000,32(3):129-131

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