×
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

piston ring material spec question

piston ring material spec question

piston ring material spec question

(OP)
Hello all

I've got a material spec in front of me, for a pearlitic gray cast iron piston ring.  The young's modulus is 90-120 GPa, and the material spec is MF 227.  I'm guessing that's a Mahle in-house spec, and I was wondering if anyone knows a rough equivalent ASTM/SAE/other spec that I could look up online.

Thanks,
Isaac

(the closest I've found so far in terms of E and hardness is "Standard gray iron test bars, as cast, ASTM class 30" but I don't know if that material matches in other properties)

RE: piston ring material spec question

I would agree that this is probably an internal spec at Mahle.  The following ASTM specs may be useful to you:

ASTM A 159 Standard Specification for Automotive Gray Iron Castings

Grades G3000, G3500, and G4000 are all pearlitic grades, with G4000 being the hardest-- 217-269 HB.

ASTM A 48/A 48M Standard Specification for Gray Iron Castings

Class 30 has a modulus range of 90-113 GPa.  Class 35 has a range of 100-119 GPa.  

The following SAE spec may also be useful:

SAE J431 Automotive Gray Iron Castings

It discusses many of the applications for the various grades, although I did not see anything about piston rings.

RE: piston ring material spec question

I don't think there is an SAE standard for piston ring materials. Gray cast iron is the basic material. Ductile iron is used for the top ring in high performance applications. They are probably proprietary modifications of the standard SAE materials to provide for the unique requirements of piston rings as compared to more traditional castings.

John Woodward

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