×
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

303 Vs 304L

303 Vs 304L

303 Vs 304L

(OP)
in our application, 304L component is press-fitted to 303 component (as insert and sleeve). Recently, our supplier unintentially used 303 for both components, huge amount of products have been made, business wants to assess the impact before scrap.

my concern would be steel galling? but can't tell whether it will be worse or the same with supplier's mistake.

any guidence??
notes:
Corrosion is not issue here
304L component requires Rmax 8 surface finish (any impact on surface finish?)
Our supplier has performed testing and dimensional check and all positive, but should I trust them?

RE: 303 Vs 304L

304 was on the o.d.?

303 now on the o.d.?

An issue is the possible, if not likely, presence of sulfide stringers in the 303, tending to reduce its fatigue capability.  In a press-fit, you are preloading the metal in tension...so if there is any possibility of overcoming the preload, and inducing cyclic stresses on the o.d. part, you may see fatigue failures down the road.

Past that, the 303 is weaker, and you may see failures cropping up during the press fit operation.  The nice thing is these will be fairly easy to screen out.

RE: 303 Vs 304L

thermoD,

If galling is your only concern, then you're better off with 303 instead of 304L.  The same alloy constituents (Se, S, P) that make 303 free machining also make it less prone to galling.  But as btrueblood notes, 303 is also much more prone to fracture than 304L for this same reason.  In fact, many industries such as aerospace usually prohibit the use of 303 entirely.

Check with your stress or M&P guys.

Regards,
Terry

RE: 303 Vs 304L

You may have trouble reaching you finish with 303.  The huge stringers in it will show if you polish.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: 303 Vs 304L

There will be no difference in the tendency for 303/303 to gall than 303/304 to gall. The information in brochure shows that there is a possible wear problem when you have a self mated 303/303 rubbing together.  The wear rate will  depend on speed and load and lubrication, if used.  

http://www.hpalloy.com/alloys/descriptions/NITRONIC60.html
 

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