Chemical Analysis Variation......

[RAJMETALLURGY]

During the chemical analysis of CF3M (final sample from melt) am getting Carbon - 0.025%. But after 2 or 3 weeks to ensure the same if I sparked the sample am getting +/- 0.002 - 0.004% variation. Is this variation is allowed for all type of steel samples and any standards for the same.

 

[EdStainless]

By OE this about as good as you can get.
What results are your getting on your reference standard?

If you really care about C you should do it by combustion anyway.

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Plymouth Tube

 

[arunmrao]

Your value of Carbon analysis is normal. The standardization of the OES for the day is important. Though you are safe, I would like to see Carbon around 0.02-0.025% as in your case, you are dangerously close to 0.03%.
As suggested by Ed, always confirm Carbon using combustion method.

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