Striplike sulfide
inclusions are generally
distributed in medium and heavy plate produced by Anyang Iron and Steel Corp.The
influence of sulfide inclusion on cold bending properties of medium and heavy plate depends on quantity,size and
distributed morphology of the
inclusions.The sulfide inclusions which are small in size and dispersively distributed have slight influence on cold bending properties,however,those sulfide inclusion which are bigger in size and distributed in clusters may act as crack sources,will directly lead to cracking of medium and heavy plate at cold bending,have a very great influence on cold bending properties.During cold bending deformation,stress concentration first causes sulfide inclusion to crack or makes inclusions separate from metal matrix and generate micro holes which increase in size continuously with deforming process,form microcracks and internal cracks when connected together,and then the cracks further expand causing medium and heavy plate to crack at cold bending.Therefore,in order to enhance cold bending properties of medium and heavy plate,a certain technical measures have to be taken so as to reduce sulfur content in steel,decrease the quantity of sulfide inclusions,improve their sizes and distributed morphology,reduce the sensitivity of steel plate cold bending to sulfide morphology.