Magnetism developed by austenitic 304 stainless steel after cold worki 1

[Piere]

Hi¡ everybody:

As we know, austenitic stainless steels show slight to severe magnetism depending on the amount of martensite transformation after cold working. However, I have not bibliography about it, Does any body have some literature to provide me.

One of my customers detected some magnetism on 304 ss (he produces storage tanks and, obviously, he had to roll the sheet), after the rolling operation he detected the magnetism. He is reluctant to believe that asutenitic ss becomes magnetic after forming operations.

 

[Metalguy]

Tell him the guys on this forum said it's true!

 

[NickE]

You tell em Metalguy....

nick

 

[BobUXL]

One reference talking about this phoenenom is "Stainless Steels" by P. Lacombe, B. Baroux, G. Beranger with the cooperation of Ugine Stainless on page 563. Copyright is 1993.

 

[mcguire]

Hard to find that book. The Metals Handbook or Stainless Steel Handbook also have this information.

 

[hacksaw]

Obviously you customer is not doing his home work. The subject covered in various shop and machinists handbooks.

Extensive cold working as well as extensive heat treating can produce a significant increase in magnetic attration especially in 304

If it has iron in it, it is hard to keep it from being magnetic

 

[TEV]

Take a look at the Avesta Polarit data sheet on Cr-Ni stainless steels. It contains the statement that these alloys can become magnetic with cold working. It can be found at

http://www.avestapolarit.com/upload/documents/technical/Cr-Ni.pdf

 

[TVP]

There are a number of places to obtain this information. The following are good websites:

http://www.atlas-steels.com.au/PDFs/Tech/Cryomag.pdf

http://www.alleghenyludlum.com/pages/products/product.asp#

Then click on Technical Data Bluesheet

http://www.aksteel.com/pdf/markets_products/stainless/austenitic/304_304L_Data_Bulletin.pdf

The references that mcguire mentioned plus one additional book are available from ASM using the following links:

Metals Handbook Desk Edition, 2nd Edition

http://www.asminternational.org/Tem...=Ecommerce/ProductDisplay.cfm&ProductID=11075

ASM SPECIALTY HANDBOOK Stainless Steels

http://www.asminternational.org/Tem...=Ecommerce/ProductDisplay.cfm&ProductID=10524

Introduction to Stainless Steels

http://www.asminternational.org/Tem...=Ecommerce/ProductDisplay.cfm&ProductID=10945

 

[grandprix]

If the size is not too great sending the rolled sections for annealing will get rid of the induced magnetism.

 

[3612469263]

To see:
Peter Marshall: Austenitic Stainless Steels,
Kluwer Academic Publishers, Dordrecht Hardbound,
ISBN 0-85334-277-6
July 1984, 434 pp.