ASTM A532 Class III Type A magnetic properties , for MP NDT 2

[Tmoose]

This is one of the wear resistant cast irons with very high chrome content, 23-28%.

It has been "suggested" that it is not ferromagnetic, or at least not enough to be successfully magnetized for Mag particle NDT.
[ul]
[li]Does anyone know if this is the case ?[/li]
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I'm getting the feeling that at that high percentage Chrome the material is all Austenite and M7C3 ( Chrome Carbide), and since Austenite is not magnetic, "not magnetic, or magnetizable" may be right.


But the otherwise quite thorough The "Abrasion-resistant cast iron handbook" talks generally about magnetic particle inspection, but says "No specialized adaptation of these techniques is required to examine alloyed AR cast irons."

 

[metengr]

Chromium is a ferrite former versus an austenite stabilizer. These cast irons are suitable for wet MT or Liquid PT examination methods.

 

[arunmrao]

High Chrome iron castings are wear resistant cast irons. The microstructure constituents are primary carbides M7C3 type, secondary carbides M23C6 and martensite. There could be some retained austenite about 5-7%. Thus making this alloy magnetic and suitable for MPI.

"Even,if you are a minority of one, truth is the truth."

Mahatma Gandhi.