Turning 304 / 316 magnetic
Turning 304 / 316 magnetic
(OP)
Hi,
I have an application where we utilise mild steel, 304 and 316(L) stainless steel components. The s/s 316 component has been running on a 316L shaft and has been damaged quite considerably. Swarf (relatively large particles) has entered the product however these particulates are magnetic. The mild steel seal housing shows no visible signs of wear so it's unlike that this is the source of the these particulates.
Is it possible that the heat generated by the stainless steel components has caused the swarf to become magnetic? I would have thought that this was unlikely however I would welcome a second opinion.
Thanks in advance.
Andy
I have an application where we utilise mild steel, 304 and 316(L) stainless steel components. The s/s 316 component has been running on a 316L shaft and has been damaged quite considerably. Swarf (relatively large particles) has entered the product however these particulates are magnetic. The mild steel seal housing shows no visible signs of wear so it's unlike that this is the source of the these particulates.
Is it possible that the heat generated by the stainless steel components has caused the swarf to become magnetic? I would have thought that this was unlikely however I would welcome a second opinion.
Thanks in advance.
Andy





RE: Turning 304 / 316 magnetic
RE: Turning 304 / 316 magnetic
"The s/s 316 component has been running on a 316L shaft and has been damaged quite considerably."
This is due to galling, a kind of cold-welding of the materials together under stress. 316/316L is very, very well-known for this.
Many previous threads on austenitic SS magnetism & galling.
RE: Turning 304 / 316 magnetic
I think I need to do a lot more research into this!!!
Cheers,
Andy Wilkinson
http://www.pharmequip.co.za
http://www.manufacturingnet.co.za
http://www.lotsofpixels.co.za
RE: Turning 304 / 316 magnetic
RE: Turning 304 / 316 magnetic
I didn't realise that 316 could turn magnetic, I always thought of magnetism as a physical property, and not variable due to stress (physical or heat wise).
RE: Turning 304 / 316 magnetic
= = = = = = = = = = = = = = = = = = = =
Corrosion, every where, all the time.
Manage it or it will manage you.
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: Turning 304 / 316 magnetic
Ferromagnetism is a physical property, but it is a function of crystal structure in steels. Ferrite (body-centered cubic) and martensite (body-centered tetragonal) are ferromagnetic, while austenite (face-centered cubic) is not ferromagnetic.
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: Turning 304 / 316 magnetic