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Reason analysis on cold bending crack of hot rolled ribbed bars
Pages: 29-31
Year: Issue:  3
Journal: Research on Iron and Steel

Keyword:  hot rolled ribbed barcold bending crackinclusiondendritic structure;
Abstract: Because the batch cold bending cracks phenomenon appeared in hot rolled ribbed bar HRB400Φ22mm in one steel plant,the mechanical properties,the chemical composition,the fracture morphology and the microstructure of specimens with cold bending crack of hot rolled ribbed bars were analyzed.The results showed that the main reason of cold bending crack of bars was that there were lots of inclusions which concentrated on edge of specimens,generated stress concentration easily and formed gap or crack,resulting in the crack during steel bending.There was dendritic structure close to the surface and distributed along the steel radial to core in steel bars,which was apt to overlap with stress concentration of transverse ribs root and inclusions.That was the cause of the crack generation during steel bending.
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