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it is related to billet or rolling process?

it is st37 steel. C 0,18-0,22 , Si 0,15-0,18 , Mn 0,55 - 0,60

dear ironic metallurgist can you explain it in more detail?

I beleive that somehow, billet surface is tearing in preparation pass and these teared surface goes another pass. at the end we saw this teared surface on rebar. Because when we saw these cracks on rib and also on core, we changed preparation passes. After that % 90 of problem is solved. At...

These are some photos from previous stands.(before becoming rebar) [img https://res.cloudinary.com/engineering-com/image/upload/v1599753044/tips/2020[img

These are bars.

Hi everybody; We are producing reinforcing steel bars. We have some scratch on rebar rib. we saw scratches on 3 or 4 ribs on one 12 meter rebar. Billet does not have any defect like crack. Can you explain reason of this cracks on ribs? Thanks in advance