×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

BH Curve of 1018
3

BH Curve of 1018

BH Curve of 1018

(OP)
Looking for the BH curve of 1018 if it exists.  Also, any other magnetic properties of this material.

Thanks!

RE: BH Curve of 1018

(OP)
The BH curve is very helpful and should suffice.  My problem is basically as follows:  I have built magnetic circuits using solid material, i.e. 1018 or equivalent.  Now we have a box type geometry and we need to weld.  Someone brought up the concern about the welded joints not being a sufficient path and possibly causing ~ 1% change in the field at the point of interest (about 300mm away from the joint).  I am debating that the welded joint only causes very local(to the joint) changes to the field probably on the order of 0.01% or less.  The magnetic inductance of the circuit is virtually unchanged although local permeability may vary due to the heat affected zone of the weld.  Post annealing may eliminate this altogether.

Any thoughts?

RE: BH Curve of 1018

His argument might be that at the joint there could be a gap between the welded parts so that most of the flux is forced to go through the small area of the weld.

RE: BH Curve of 1018

What is the flux density of the steel circuit at that point now. A gap will not help you but if your geometry overlaps with out a gap and you are below saturation than a weld is not much of an issue. Subtract the area effected by the weld and see what the effect is in an FEA solution. That would be worst case. If the circuit is corner to corner with a fillet weld it is a bad design.

Mike

RE: BH Curve of 1018

Going back to the original question about the BH curve for 1018, I was also looking for this information and got the information from the link. The software I use only has 1008 and 1010 low-carbon steel values in its standard material library. Now I'm a little confused. From my software, at H=318310, B=2.485 for 1008 and B=2.4 for 1010. From the information on 1018, B=2.43 at this H. Shouldn't the B for 1018 be lower than 2.4 Tesla, because of the higher carbon content? I'm working on a solenoid that operates in saturation and trying to correlate the model which I designed in 1008 and the sample I had made with 1018 steel.

RE: BH Curve of 1018

The heat treatment and/or mechanical working of the steel play significant roles in magnetic output.  That's probably why you see different numbers.

Most 10XX series steels are not processed with magnetic properties in mind, so you're going to see a lot of variation.

One should only consider published BH curves as approximate (same goes for that supplied by your software).  Going from 1008 to 1018 (assuming the heat treat and mechanical work is similar) is only going to cause 2 to 3% change in output.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources