Rounding the edges of Cr-Mo steel and HIC steel plates?
Thread Content
Thicker Cr-Mo steel and HIC steel are used for the steel plates of drums and pressure heads. Due to stress concentration at the plate edges during the manufacturing process, the steel plate may crack. The edges of the plate need to be rounded during cutting. Please, fellow sailors, discuss what size circle at the edge of the board is reasonable. (Some manufacturers adopt a method in which the rounding at the inner edge of the steel plate is less than that at the outer edge.)
In our company, thicker Cr-Mo steel and HIC steel are commonly used, and no special effort is made to address or prevent potential cracking at the edges of the plates during cold forming. Chromomolybdenum steel and HIC steel do not have very high strength, so plate edge cracking generally does not occur. Moreover, thicker end caps are generally hot-formed, so there’s no need to consider that at all. If it’s high-strength steel, then it indeed needs to be taken into consideration!
Reply to 2# ztr1118: We pay special attention to this because we have encountered cracks before! According to your opinion, if it is high-strength steel, how should we consider rounding the plate edges?
I agree with “Flying Snow Treading on Swallows” – it’s pointless to try to round it out; in any case, welding is the best option
Reply to 3# Xiaoxiaobao521: MT or PT can be used on the groove of the ring weld to first rule out the presence of cracks. If necessary, round off the outer edges with a grinding wheel; the inner edges do not need to be treated. Because when the cylinder is formed into a circular shape, its outer surface is under tension while its inner surface is under compression. Materials tend to develop cracks when stretched, or these cracks can easily propagate starting from existing microcracks. The above opinions are for reference only.
Reply to 5# ztr1118 Hehe! ! Thank you! !
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