engineering fundamentals Discussion Forum
Directory | Career | News | Industrial
Home Membership Magazines Forum Search Member Calculators

Materials

Design

Processes

Units

Formulas

Math
List Recent Topics | Start a New Topic
 

<< Previous Message No. 21254 Next >>
Author: rorschach
Time: 10/27/10 13:58 PST
This is a reply to message no. 20932 by PJMVatPLXS
Reply | Original Message | New Topic | List Topics | List Messages on This Topic
Current Topic:
Magnetism not desired while modifying a stainless steel rod

this is especially common in low alloy stainlesses such as 301 or 303 stainless (they are just barely "stainless" in that they are only about 12-13% chrome). less so on higher alloy 304 or 316 (18% chrome 8% nickel) but even they will do it, just to a lesser degree. Some alloys are specifically designed for lots of cold work like alloy 321 or 347 and they tend to exibit much less of this but they'll still do it. bending changes some of the crystals from Austenite to Martensite which is magnetic. Annealing after bending will return it to Austenite.

We had a magnetic sensor we designed that used (very) small stainless screws to mount the PCB and we discovered that the screws were magnetic enough to make the sensors unreliable so we ended up having to switch to Beta titanium screws to eliminate the magnetism. (brass was too weak, the heads twisted off too easy.)

[ List Replies to This Message Only ]

Home  Membership  About Us  Privacy  Disclaimer  Contact  Advertise

Copyright © 2018 eFunda, Inc.