Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Exhaust valve for CNG

Status
Not open for further replies.

yoppu

Automotive
Joined
May 13, 2014
Messages
10
Location
MY
i have chemical composition on the valve material as follow:
C=10.06 ; Mn=2.12 ; Fe=50.91 ; Ni=5.27 ; Cu=1.37 ; Si=0.37; Cr=20.56.

How i can know this result is approximately to which std material?
 
Based on the (false) precision of the results, I assume this composition was determined via x-ray spectrometry. The carbon is way off (probably just surface contamination). Based on the application and copper concentration, I would assume this is S30430 or similar that was selected for its ability to be formed into shape and provide high temperature strength and oxidation resistance.
 
What is the remaining ~10% ?

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.
 
errors.
Unless your calibrations samples closely bracket this chemistry you could easily have more than 15% relative error on each element.
There are Cu bearing variants of 300 and 200 series stainless alloys, but given the obvious error in C the Cu could be surface as well.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
 
Status
Not open for further replies.

Part and Inventory Search

Sponsor

Back
Top