stainless steel T304 composition

[hihi]

I've seen there's T304 grade stainless steel and it's advertised as anti-magnetic. What is the composition to T304, is it the same as 304?
Also, about being non-magnetic, does it applies to all austenitic grades? (all 300 series stainless steel)

 

[spn]

I suggest you to browse in

http://www.matweb.com.

spn
spn_tan@telkom.net
"if you need wire drawing references please email me"

 

[ESCHENKY]

t304 AND 304 ARE THE SAME. It is non magnetic in the annealed(soft)condistion but becomes morso as it is "cold- worked" or formed. Look up precisionsteel.com for excellent flat rolled metals info.

 

[welding1]

No
304 and 316 type grades include small quantities of delta ferrite, which makes them very slightly magnetic, but not sufficient to detect with a magnet. There may be a way of using manganese instead of ferrite, which may lower magnetism. 310 and super austenitic will be ferrite free, but materials such as Duplex and ferritic and martensitic grades will be quite magnetic.

For more information on stainless steels visit

http://www.gowelding.com

Regards
John

 

[joescan]

http://www.azom.com/details.asp?ArticleID=965

 

[jimdempster]

I've noticed with some of the newer, stronger magnet materials now available (samarium-cobalt, NeFeB) that a *not-so-small* magnetic effect can be noticed with 304 fasteners, especially when they've been cold worked. With these strong magnets, you can even wave them over an aluminum plate and feel the drag on the magnet!

If you need truly reduced magnetic behavior, consider annealing the 304 parts (to get a fully austenitic composition), or possibly de-magnetizing in an AC field if all you need is to randomize the residual field.

If you need magnetic sheilding, consider mu-metal.

 

[mcguire]

Yes, T304 and 304 are the same. Cold work makes this alloy ferro-magnetic. Welds will have about 2-5% magnetic microconstituents ( delta ferrite). Type 305 is used where it is imperative to stay non-magnetic after cold work, although 201 would do this just as well.

 

[hihi]

Hi everyone,

Thanks for the reply on 304. It's really helpful.

When cold worked, 304 undergoes phase transformation, does it happen to 316/316L as well?

 

[TVP]

Most of the austenitic, 300-series stainless steels will undergo the transformation to some extent depending on the exact chemical composition, strain rate during forming/deformation, etc.

316 has a higher nickel content than 304, so it does not transform to martensite during deformation as much as 304 does. Stainles steel Type 301, Type 201, and Type 302 transform the most, and therefore, strain harden to higher strength levels than the other austenitic alloys.

 

[pardal]

I want to keep track on this topic Pardal