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High Silicon Steel Decarb
2

High Silicon Steel Decarb

High Silicon Steel Decarb

(OP)
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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RE: High Silicon Steel Decarb

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?

RE: High Silicon Steel Decarb

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=ORil4pedzjEC&pg=PA309&lpg=PA309&dq=steel+decarburization+silicon&source=bl&ots=m0jT4Hp1Wu&sig=Hh_F5ZjiAS_mgQKm1XaPtLtMOMo&hl=en&ei=dqByTtvjC4ijsQKE8ai9CQ&sa=X&oi=book_result&ct=result&resnum=8&ved=0CF0Q6AEwBw#v=onepage&q=steel%20decarburization%20silicon&f=false
 

RE: High Silicon Steel Decarb

(OP)
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.   


"Metal Health'll cure your crazy
Metal Health'll cure your mad
Metal Health is what we all need
It's what you have to have"

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RE: High Silicon Steel Decarb

(OP)
TVP
Awesome :)  thanks for the reference!


"Metal Health'll cure your crazy
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Metal Health is what we all need
It's what you have to have"

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RE: High Silicon Steel Decarb

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

RE: High Silicon Steel Decarb

Quote:

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.

RE: High Silicon Steel Decarb

swall,

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

RE: High Silicon Steel Decarb

Thanks for looking.

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