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)
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
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
John Woodward