Chemical uniformity in Forged bar
Chemical uniformity in Forged bar
(OP)
I have got a few low carbon steel forged bar with 620mm diameter and 3m long. It has been found that the chemical composition is varies from one end to the other with a difference of about 0.02% for carbon. Other elements are not varies considerably.
The material was already edge cutted and grinded before the PMI test, so shouldn't be oxidation of the surface. Is this effect due to the density of the alloying element?
Can anyone give some idea please?
Many thanks
Lei
The material was already edge cutted and grinded before the PMI test, so shouldn't be oxidation of the surface. Is this effect due to the density of the alloying element?
Can anyone give some idea please?
Many thanks
Lei





RE: Chemical uniformity in Forged bar
How reliable is the sampling procedure?
Chocolates,men,coffee: are somethings liked better rich!!
(noticed in a coffee shop)
RE: Chemical uniformity in Forged bar
Sampling are carried in the company by bodycote, i think they are quite reliable.
Thanks
RE: Chemical uniformity in Forged bar
I would agree with your opinion of Bodycote with the caveat that no one is perfect.
Just a hunch but something sounds off a bit in the 0.02%. Might there be a couple minor errors that compound?
Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com
Good engineering starts with a Grainger Catalog.
RE: Chemical uniformity in Forged bar
RE: Chemical uniformity in Forged bar
Another issue how is this variation in carbon affecting your end product or performance?
As an aside my son works for Bodycote in one of their testing labs in their mechanical testing group !!
Chocolates,men,coffee: are somethings liked better rich!!
(noticed in a coffee shop)
RE: Chemical uniformity in Forged bar
I had 10 tests they all showing the same.
It does not bring me problems, just want to understand it
RE: Chemical uniformity in Forged bar
An outfit by that name near Chicago made 3 critical mistakes in a job that we had run through their shop not so long ago. But I would not be concerned with this chemical variation unless it was a significant percentage of the total amount such as in a low C stainless.
RE: Chemical uniformity in Forged bar
I know there must be a issue of sampling and testing.
But apart from that what can be the basic reason. Decarburization can explain carbon content, how about other elements.
These materials are experienced some problem in the past. That's after HTs. Chemical can be one of the issue.
Thanks
RE: Chemical uniformity in Forged bar
Regards,
Cory
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RE: Chemical uniformity in Forged bar
Chocolates,men,coffee: are somethings liked better rich!!
(noticed in a coffee shop)
RE: Chemical uniformity in Forged bar
Chocolates,men,coffee: are somethings liked better rich!!
(noticed in a coffee shop)
RE: Chemical uniformity in Forged bar
Was this material forged from ingot or billet? What is the carbon level (what is your low carbon)?
RE: Chemical uniformity in Forged bar
RE: Chemical uniformity in Forged bar
agree with ulyssess. Assuming that these are forged from ingots, and that there is a reasonable amount of carbon in the material bulk, 2 pt difference in carbon is very reasonable.
RE: Chemical uniformity in Forged bar
RE: Chemical uniformity in Forged bar