Cast Iron Grade Identification from Spectroscopic Analysis

Maybe diecast Zinc rather than cast iron.

Some places simply used whatever was available for the melt.

Or else you're measuring a thick Zinc coating rather than the parent metal.

Correct , it was a very thin zinc plating , silly i overlooked that when "The evidence was right under my nose" .

actual Spectro of the cast iron is 97 % Fe , 1.4 % carbon , 0.44 % Cu , LEC remainder.

An iron alloy of carbon 2.1% or lower is defined as steel, not cast iron.

A small variation in percentage of carbon has a big impact on material property.

I did a test weld with MIG , welding a round bar to it with a fillet weld then tapped it with a hammer , the weld broke off the casting leaving a 0.5 mm indentation in the cast with no fusion , just as you get if trying to weld a gray cast iron.

The item has a fracture in it from impact , if it was steel it would deform rather than fracture.

Yes.

My point, reading again my comment in #5, wasn’t stated very clearly.

I do not doubt the characteristics of the subject material. The spectro analysis sample seems to have been contaminated, or compromised, or adulterated...

It looks like galvanized iron. Maybe the copper and cobalt are impurities from somewhere else.

"The component is part of a hydraulic cylinder."

I think you need to be more specific.

Yes. The original equipment manufacturer certainly can. That's what the telephone is for.