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How do I reduce the efect of macrasegregation of carbon in steel?

How do I reduce the efect of macrasegregation of carbon in steel?

How do I reduce the efect of macrasegregation of carbon in steel?

(OP)
I'm having macrosegregation problems with a 0,3 %wt carbon steel. The diameter of the part is quite thick, 80 mm, so I found carbon percent of 0,28% in the surface and 0,39% in the segregation region (in the center of the part).   

RE: How do I reduce the efect of macrasegregation of carbon in steel?

Can you provide some additional details please, such as type of casting process (I am assuming this is some type of casting), mold material, cooling method, etc.?   

RE: How do I reduce the efect of macrasegregation of carbon in steel?

(OP)
It was used no-bake moulding and cooled inside the mould (the mould left in ambient temperature).

RE: How do I reduce the efect of macrasegregation of carbon in steel?

Addressing the solidifcation issues raised by TVP is an important area of work for you.  Also, you can investigate post-solidification heat treatment.  Homogenizing steels usually takes place at a temperature between 1000 °C and 1500 °C.

RE: How do I reduce the efect of macrasegregation of carbon in steel?

Is the part made from bar stock? Perhaps the bar was rolled from ingot cast steel. I know steelmaking is much improved but I used to encounter a similar condition in 1050 bar that would cause chevroning after cold extrusion.

RE: How do I reduce the efect of macrasegregation of carbon in steel?

How did you get lower carbon on the surface,when you have processed oin a no bake mold? Normally there should have been a carbon pickup from the carbonaceous products burning.Please recheck your testing.

Let the castings cool in the mold for a longer time,this might help reduce the carbon gradient. There is no substitute for homogenizing,you need to do it for a longer holding times to eliminate the carbon gradient.Are there any other alloying elements also in the steel exhibiting segregation pattern?  

I have not failed. I've just found 10,000 ways that won't work." — Thomas Edison
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RE: How do I reduce the efect of macrasegregation of carbon in steel?

This is a question. the problem is a macrosegregation of carbon in centerline of cylinder for process steel casting. steel 0,3% carbon without alloy elements.

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