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Determine the grade of ductile iron

Determine the grade of ductile iron

Determine the grade of ductile iron

(OP)
I have a steel tube with a ductile iron ring insert that is brazed in place with copper.  Internal threads are cut into the ductile iron ring.  I know the chemical composition of the ductile iron, but do not have enough of the material to perform a mechanical test of the material.   The microstructure of the ductile iron is bainitic which I think indicates it is austempered (correct  me if I'm wrong).

The chemical composition is low in Nickel, Iron, Mo, etc.  So this leads me to believe this material is Grade 1 austempered ductile iron per ASTM A897.  The iron insert is machined from bar stock.

Does anyone see a problem with this logic? THANKS!

RE: Determine the grade of ductile iron

There is no Grade 1 per the ASTM A 897 material specification I have reviewed. There are strength Grades identified by tensile/yield/elongation. If it were me, I would try and obtain a Brinell hardness just to confirm Grade because typical Brinell hardness is listed for each strength Grade.

RE: Determine the grade of ductile iron

I concur with metengr.  Should be ADI, you just need to confirm which grade according to ASTM A897.

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