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Old 01-17-2008, 08:03 AM   #1 (permalink)
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Grinder grading of steel?

At one point and time I found, somewhere, an article about using a grinder to determine the grade of steel you have but I can not seem to find it searching either here or google. Anybody have a good link to one? I have a bunch of pins and I want to get an idea of what they are made of so I can decide if they will be strong enough for something stupid.
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Old 01-17-2008, 09:31 AM   #2 (permalink)
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Google "steel spark test"

http://shopswarf.orcon.net.nz/spark.html

http://en.wikipedia.org/wiki/Spark_testing_metals
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Old 01-17-2008, 10:50 AM   #3 (permalink)
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Thanks, exactly what I was looking for. I had the wrong words in there...
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Old 01-17-2008, 03:37 PM   #4 (permalink)
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Having another piece of steel that you "know about" helps to compare the spark types.

I only say this cause I have ground ALOT of types of steel, and those pictures and terms that were linked on those pages are easy for me to understand, but if I was a newb it would all seem very similar.

The differences are actually quite subtle.

I would tell a less experienced person to compare steel pins and their strength by putting them in a chop saw with abrasive wheel and cutting them all the way through. You won't have to look at sparks to get a fairly accurate idea of it's strength quickly. Again, compare it to something you "know" about.
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Old 01-17-2008, 04:30 PM   #5 (permalink)
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I agree with solarpower
"the welders handbook" goes through this as well, that could have been where you saw it
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Old 01-17-2008, 09:47 PM   #6 (permalink)
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You should use a clean or virgin grinding wheel. Any residual metal from other uses might spark off and give an erroneous spark pattern.
I agree it takes some practice to be able to correctly identify steel using s spark test.
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