The
analysis of the crack on the HRB400 screw-thread steel surface has been carried
out by means of metallographic microscope, scanning electron microscope and EDAX.
It is shown that the type of inclusions in the crack steel samples is mainly class
B oxide, C silicate, and the inclusion size of the majority below 10 μm, and a small number of large inclusions are observed. The content of oxygen in
the steel is high, and the carbon segregation is the main reason of the crack formation
of HRB400 screw-thread steel. The measures to improve the crack formation of HRB400
screw-thread steel are put forward, which provides a powerful basis for the practical
production.
References
[1]
Xiao, L., He, W.S. and Zhou, Y.D. (2002) Experimental Research on Electroslag Pressure Welding of HRB Grade 400 Reinoforcement. Building Construction, 24, 496.
[2]
Yang, Y. (2014) Analysis on Tensile Fracture of HRB400 Rebar Welding Joint. Physics Examination and Testing, 32, 28-31.
[3]
Fu, H.B., Lu, X.H. and Ma, E. (2006) Comprehensive Performance Analysis for B400 Renforced Bar. Hebei Metallurgy, No. 6, 44-47.
[4]
(2007) Steel for the Reinforcement of Concrete—Part 2: Hot Rolled Ribbed Bars.
[5]
Zhao, J., Chen, Y. and Chen, R. (2012) Revision Suggestion to GB/T 13299-1991 “Steel-Determination of Microstructure”. Percutaneous Transluminal Coronary Angioplasty (Parta: Phystest), 48, 808-811.
[6]
Gao, L.L., Yan, J.P. and Zhang, H.Z. (2009) Analysis of Unqualified Strength of 20MnSiV Hot Rolled Ribbed Bars. Physics Examination and Testing, 27, 56.
[7]
Zhou, G., Zhang, J.X. and Cai, X.X. (2013) Cold Bending Fracture of HRB400 Screw Thread Steel Bar. Physics Examination and Testing, 31, 36.
[8]
Mi, G.R. and Li, W.X. (1997) Reasons for Crack Formation on Ribbed Steel of 20MnSi. Journal of Baotou University of Iron and Steel Technology, 1, 42-45.
[9]
Song, F.F., Yao, J.H. and Li, J.S. (2011) Research on Cleanliness and Properties of HRB400 Steel. Henan Metallurgy, 16, 8-10.
[10]
Yuan, W., Lu, X.G. and Guo, S.Q. (2004) Causes of the Generation of Inclusions in 20MnSi Steel. Journal of Shanghai University, 10, 471-474.
