Study of Detecting Flaws in a Heavy Bridge-Making Steel Plate

Hai He Luo; Han Xiong Dong; Zhong Bo Dong; Jun Hong

doi:10.4028/www.scientific.net/AMR.532-533.45

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 532-533Study of Detecting Flaws in a Heavy Bridge-Making...

Study of Detecting Flaws in a Heavy Bridge-Making Steel Plate

Abstract:

The flaws in a heavy bridge-making steel plate (Q370qE) were detected by ultrasonic test, the types and formation reasons of which were studied by metallographic examination, scanning electron microscope (SEM) and energy dispersive X-ray (EDX) spectrometer. The results showed that the types of the flaws were mainly crack, micropore and inclusion. The formation of crack and micropore was attributed to the center segregation, porosity, as well as the role of structural stress and thermal stress. Moreover, the inclusions were mainly composite oxides (MgO, Al₂O₃, CaO, etc.) and MnS, the former came from the raw materials and impurity oxides, however, the latter came from the center segregation of the alloying elements. Besides, some improvement measures to reduce detecting flaws were also proposed.