700 MPa大梁钢拉伸断后分层现象的解析

doi:10.13228/j.boyuan.issn0449-749x.20170292

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Abstract The mechanical properties of the 700 MPa beam steel hot rolled plate were tested， confirming the phenomenon of delamination in the tensile fracture. Metallographic microscope， Scanning electron microscope with energy dispersive spectrometer （SEM-EDS）， transmission electron microscope with energy dispersive （TEM-EDS） were used to investigate the layered fracture. The average yield strength and tensile strength of this steel were 766.9 and 839.0 MPa respectively with average elongation of 19.2%，which meets the requirement of the performance. The results of the study shows that the inclusions and precipitates were finely distributed in slab and rolled products， which， however， is not the main cause of the delamination phenomenon. The bainite and M-A island were zonal distributed along the middle of the thickness-direction of the hot rolled plate， resulting in the discrepancy of plastic property， which is the direct cause of delamination phenomenon. The delaminating of tensile fracture for 700 MPa beam steel were analyzed and the improvement direction of actual production was proposed.

Key words： 700MPa beam steel mechanical property layered fracture precipitates banded structure

Received: 06 June 2017 Published: 14 November 2017

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	Articles by authors
	LIU Hui
	YU Yang
	XUN Qiang
	FU Jian-Xun

Cite this article:

LIU Hui,YU Yang,XUN Qiang等. Analysis on delaminating of tensile fracture for 700 MPa beam steel[J]. Iron and Steel, 2017, 52(11): 52-58.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20170292 OR http://www.chinamet.cn/Jweb_gt/EN/Y2017/V52/I11/52

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