ASTM A-194 24-Hour Hardness Test
ASTM A-194 24-Hour Hardness Test
(OP)
I'm looking for information on the origins and/or perceived benefit of the 24-hour hardness test in A-194 for most of the quenched and tempered nuts. I seem to remember that this was a method of validating the heat treat (i.e., the quench was performed and that the temper was done at/above the minimum required tempering temp.).
Any info would be appreciated. Thanks in advance for your time. Happy New Year.
Any info would be appreciated. Thanks in advance for your time. Happy New Year.





RE: ASTM A-194 24-Hour Hardness Test
I have a copy of SA 194 (identical to ASTM A 194 except editorial differences in Tables 1 and 4), and I see no such requirement for a 24 hour hardness test. There are hardness tests required for the specific grades, but no such time limit. Where exactly did you see this requirement?
RE: ASTM A-194 24-Hour Hardness Test
RE: ASTM A-194 24-Hour Hardness Test
7.1.5 Test 2—In addition to the testing required by 7.1.2.1 the manufacturer shall also perform hardness tests on sample nuts after the following test heat treatment. After completion of all production heat treatments heat the specimen nuts to the temperatures indicated below for 24 h, then slow cool. Test at
room temperature.
Regards,
Cory
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RE: ASTM A-194 24-Hour Hardness Test
Billybaru mirrored what I've heard in that its a audit (verification) that the temper was performed correctly.
I've researched as far back the 1969 version of A-194 and cannot locate any rationale in the Standard as to why the test is required. This is what I'm looking for, the rationale behind the test.
Again, thanks for your input.