ASTM D3520 for Quenching Time of Heat-Treating Fluids
ASTM D3520 Standard Test Method for Quenching Time of Heat-Treating Fluids (Magnetic Quenchometer Method)
10. Calculations and Reports
10.1 Record (1) quench times and (2) identifications of the test balls used.
NOTE 18 - A suggested form for recording the data is supplied in Appendix X1.
10.2 Calculate the average value of the two runs on the test fluid.
10.3 Calculate the average value of the tests run on the reference fluid immediately preceding and following the runs on the test fluid.
10.4 Calculate and report the relative cooling index (RCI), % as follows:
RCI = FR X 100/FT
where:
FR = average quench time of reference fluid, s, and
FT = average quench time of test fluid, s.
11. Precision
11.1 Precision - The precision of this test method as determined by the statistical examination of interlaboratory test results is as follows:
11.1.1 Repeatability - The difference between successive test results, obtained by the same operator with the same apparatus under constant operating conditions on identical test material would, in the long run, and in the normal and correct operation of the test method, exceed the following values only in 1 case in 20:
5% of the mean (quench time, seconds)
11.1.2 Reproducibility - The difference between two, single and independent results, obtained by different operators working in different laboratories on identical test material would, in the long run, and in the normal and correct operation of the test method, exceed the following values only in 1 case in 20:
9% of the mean (quench time, seconds)
11.2 Bias - The procedure in Test Method D3520 for measuring quenching speed characteristics of petroleum fluids has no bias because the value of quenching speed can be defined only in terms of a test method.
12. Keywords
12.1 Curie point; magnetic quenchometer; quench; quenchant
