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Exhaust valve for CNG

Exhaust valve for CNG

Exhaust valve for CNG

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?

RE: Exhaust valve for CNG

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.

RE: Exhaust valve for CNG

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.

RE: Exhaust valve for CNG

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

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