×
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

Hardness for 50 mm dia. shaft in 1045

Hardness for 50 mm dia. shaft in 1045

Hardness for 50 mm dia. shaft in 1045

(OP)
I need to know the best hardness for my industrial 50 mm diameter shaft in AISI 1045 material.  I don't wanna be too hard because I don't need strenght, I need wear resistance (with the key).  

I was thinking around 30 HRC.  Is it too brittle ?

Cedric

RE: Hardness for 50 mm dia. shaft in 1045

1045 normalized at 1650 then water quenched from 1525-1550 followed by a 2 hour temper at 1000 should give a hardness of around 30HRC combined with reasonable toughness.

RE: Hardness for 50 mm dia. shaft in 1045

Why not use hardchrome shaft, in which the base mat'l is normally 1045.  Then you also have some corrosion resistance and some precision sizing to boot.

RE: Hardness for 50 mm dia. shaft in 1045

30 HRC will not provide very good wear resistance.  As ornerynorsk points out, 1045 that has hard chromium plating is often used when wear resistant shafts are required.  The shaft is usually surface hardened to at least 450 HV (~ 45 HRC) and then chrome plated.

RE: Hardness for 50 mm dia. shaft in 1045

Just a thought, if you intend to hard chrome plate after heat treatment (surface) to increase the strength of this material you might want to consider a post bake operation at 500 deg F to remove any effects of dissolved hydrogen from plating.

RE: Hardness for 50 mm dia. shaft in 1045

In general, AISI 1045 is commercially available as HRc 18-22.  You can heat treat, the quench and temper for elevated hardness, typically HRc 28-32.

What I have done quite often in the back shop is to flame harden the shaft by simply applying heat via a tiger torch.  Let the shaft become cherry red, then quickly submerge it into a bucket of ordinary motor oil, say SAE 10/40.  Be sure to stir the motor oil while the shaft is submerged, i.e. no peaking, air will tend to ignite the oil, which was my last mistake!  :)

You will find the wear to be sufficiently addressed using flame hardening methods.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada

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