McQuaid Ehn Grain Size Test Sample

[yupper56]

Has any one ever used a "stream sampler" lolly pop obtained during the teeming of an ingot to run a grain size rather than using a sample from rolled product.

 

[Metalguy]

Uh, are you at all aware of what is known as "grain refinement" during the hot working of steel?

 

[yupper56]

Yes, I am well aware of the effect of hot working and rolling on grain structure. It was suggested in a meeting to try a chem lolly pop as an alternative to a product sample to run the austenitic grain size test. On occasion the GS tests were not available and the only recourse was to notch the product to obtain a sample. I had never heard of any one ever using the chem sample for this purpose -- but you never know. We have carburized several tests, but are getting mixed results.

 

[Metalguy]

Guess I don't understand the purpose. Why would you care what the as-cast GS is? It will be huge.

 

[yupper56]

Appreciate the comments. I concur 100%