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


Is EN353 cold forgeable as much as SCM420

Is EN353 cold forgeable as much as SCM420

Is EN353 cold forgeable as much as SCM420


We are doing a gear box for a two wheeler (for the first time). Most of our benchmarks are of Suzuki and Honda bikes. All their gears are made of SCM420. Surprising part is these gear teeth are formed by cold forging. No machining at all!

Now, I was comparing the chemical composition of SCM420 with EN353 and there were few components similar (C, Cr, Mo, Si) and few different.
  1. Marginally high P and S in SCM420.
  2. Plus, there is a small addition of Cu in SCM420.
  3. Most importantly Ni is very less
I am not sure about the impact of these changes. However, I have read nickel provides more toughness and since EN353 contains more Nickel, can I cold forge gears with EN353 as well? Will I land up in any problem? Your help is very much appreciated. Thanks!

RE: Is EN353 cold forgeable as much as SCM420

The addition of > 1.5% Ni increases the flow stress of the steel, making cold forging more difficult. The higher flow stress increases forces and hence stresses on the tools, which makes it more difficult to achieve adequate tool life. Most net-shape gears using EN353, SAE 4320, or similar high-Ni alloy steels are warm forged rather than cold forged. Warm forging at temperatures between 600 and 700 C typically produce similar accuracy/precision as cold forging, since scaling and oxidation is not significant in this temperature range. The flow stress is reduced by ~ 30 to 50% in this temperature range.

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!


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close