Carbon Content decrease after Cold-forging process?

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SUMMARY

The discussion centers on the unexpected decrease in carbon content of 1010 CHQ steel after a cold-forging process, where the carbon content dropped from the expected range of 0.08 - 0.13 to 0.041. Participants suggest that this anomaly may be due to segregation, where carbon atoms migrate to the surface of the material during processing. It is noted that prolonged heating could also affect the carbon distribution, potentially explaining the observed results.

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soo33y
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Hi guys,

I've come across an abnormality at work with regards to Carbon Content.

The raw material used was 1010 CHQ which should have a carbon content of 0.08 - 0.13.

However after going through a cold-forging process, we tested the final product and found that the Carbon Content decreased to 0.041.

How did this happen? Is it possible? Can someone explain?

Really stumped at this stage.

Cheers,
Daniel.
 
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No explanation. That sounds astounding to me.

Maybe there was some segregation and the tiny place where you measured was chosen unluckily?
 
segregation may lead to C atoms migrating to surface of the material.
But this should not be a problem unless the material is heated for a long time.
If heated for a long time and tested after heating inside the material, the result of yours seems to be acceptable.
 

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