High Silicon Steel Decarb 2

[MetalHead83]

I am an intern at a company that melts and rolls many different grades of non-stainless steel. We have had some consistent issues with de-carb in some high-silicon steels (particularly 1% or higher Si). The grades we melted with this issue also typically have .40% + carbon.

Do high Si steels all have this sensitivity, or am I missing something?


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[metengr]

What is the thermal treatment detail for this material after it is cast into heats? If heat treated during or after rolling, what is the furnace atmoshpere and how is it controlled?

 

[TVP]

Yes, increased levels of Si favor the formation of decarburized surface layers when exposed to oxygen at elevated temperatures. Here is one reference book that mentions it. I'm sure a Google search woul return more.

http://books.google.com/books?id=OR...epage&q=steel decarburization silicon&f=false

 

[MetalHead83]

Metenger
we cast into 40'+ billets, and anneal after rolling. We pump in some type of inert atmosphere. I can get more specific information if that would help.


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[MetalHead83]

TVP
Awesome thanks for the reference!


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[swall]

TVP--do you actually have the book? I am curious as to what references Totten cites for his silicon statements.

 

[metengr]

We pump in some type of inert atmosphere.

I would be more specific than relying on a general statement above. Better check on how effective this inert atmosphere is because simply relying on elevated silicon to explain increased decarburization could be sending you down the wrong path.

 

[TVP]

swall,

I do have the book. Chapter 6 Steel Heat Treatment was written by Božidar Liš?i?. There are 33 references for that chapter, but none appear to be directly linked to that section on decarburization.

 

[swall]

Thanks for looking.