Magnetic Properties of Cast vs Wrought

[katiebsmall]

I am looking for information on the difference that may occur in magnetic properties between a wrought part and cast part. Any information is beneficial.

thanks

 

[metengr]

What material? This makes a difference.

 

[katiebsmall]

the materials i am dealing with are stainless steel and Al.

Thanks, forgot to add that in there!

 

[arunmrao]

Is this an assignment question please? If not please provide the reason for such a concern?



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"The richer we have become materially, the poorer we have become morally and spiritually." Martin Luther King Jr

 

[katiebsmall]

I am consulting on a job for a valve manuf. they are looking at cost savings measures and I am not a magnetics expert and could not find any information online.

 

[metengr]

For starters, the web site below contains some general information that would allow you to understand basic differences between cast and wrought stainless steel;

http://www.keytometals.com/articles/art67.htm

 

[katiebsmall]

thank you. i know the basics as i am a trained metallurgist however i never studied magnetics in school so i wasn't sure what the different structures would do to the properties.

 

[arunmrao]

Thanks for the clarification. what is the valve used for and where do you intend using the parts?

Normally such questions arise for military applications like mine sweepers etc.

In SS too,we have 2 categories broadly,magnetic and non magnetic,a few experts might also argue about paramagnetic.

However, Al is non magnetic. If you can be more clear,you could expect meaningful replies.


_____________________________________
"The richer we have become materially, the poorer we have become morally and spiritually." Martin Luther King Jr

 

[EdStainless]

Many times cast austenitic SS has issues with not being fully non-ferromagnetic.

There need to be questions asked about field strength, frequency (if AC), and so on. This might be an involved question.

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Plymouth Tube

 

[katiebsmall]

i appreciate everyone's help on this one. the part is a non-wetted one in a valve housing for semi-conductor fabrication. i was able to get a little more info and it turns out the material is 1020 steel that is currently wrought and they are looking into casting but worried the magnetics will differ greatly with directionality.

 

[arunmrao]

1020 is not SS or Al alloy it is a plain carbon steel. May be you can mechanically work the casting to get a nearly similar grain structure.

_____________________________________
"The richer we have become materially, the poorer we have become morally and spiritually." Martin Luther King Jr

 

[katiebsmall]

thank you. yes, i know 1020 is plain carbon steel. i was mistaken at first to what alloys this company was interested in. usually they ask me questions about SS. i guess my question is too out there. i was just looking for generic answers to the difference. i.e. one will have better magnetic properties over the other and why. thanks again for all of your answers! i didn't realize that pending the alloy answers would be different. the company is looking to do the least amount of work to the part and just wanted to know if there were alternative means of manufactoring.

 

[swall]

I would not expect any appreciable difference in magnetic properties of a wrought 1020 steel part vs a low carbon steel casting or a gray or ductile iron casting.

 

[prdave00]

I did a quick search through a database at Stanford I have access to and didn't turn up anything with the keywords: 1020, steel, cast, wrought, magnetic.

I did find a thread at

http://www.finishing.com/112/70.shtml

discussing differences in magnetic properties between wrought 316 stainless product and its closest casted counterpart CF-8M based on how the chemistry is "balanced" to lend itself better to the process in question. I wonder if that is something to consider (not knowing anything about 1020 steel) in addition to directionality differences.

Have you contacted any fellow metallurgist at Carpenter Alloy, etc.?

 

[Wrenchbender]

Searched 'magnetic properties cast vs wrought steel -stainless' and got this out of many.

http://books.google.com/books?id=tC...&resnum=3&ved=0CCcQ6AEwAg#v=onepage&q&f=false

Some differences are shown between cast and wrought iron and ditto for steel on p.367 and p.368, respectively. The physical basis probably has something to do with grain/domain size, orientation and degree of anisotropy.

"Very interesting indeed, but tell me, Mr. Faraday, of what use is this electricity?" "Sir, you will soon be able to tax it."

 

[MagMike]

katiebsmall: Double-posting is frowned upon.

For a given size, a wrought part will have a higher coercivity than an as-cast part.

With regards to your question as to which has better magnetic properties, that all depends on what you need it to do. Many applications require high coercivity, just as many applications require low coericivity.

 

[EdStainless]

cast carbon steels,
generally the casting will have lower saturation and higher coercive force, but it will depend on the chemistry.
for most applications, if you have gotten by with generic 1020 the casting will look the same to you.

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Plymouth Tube

 

[katiebsmall]

Thank you very much for your help. There is a lot of good information here now. I will take a look at and see if this will help answer the company's question.

MagMike: sorry for the double post. new here and it took me a while to find the Magnetics forum and by then people were answering on here and couldn't figure out how to delete the posting. won't happen again.