Keywords: calculation, cylindrical, quenching, hardness,

　　The calculation method of h value is: for the stepped cylindrical sample (variable diameter sample), end quenching is carried out with 18 ℃ purified water and its hardness is measured, and its h value is set to 1; Then the medium to be tested is end-quenched with the same sample and the same method, and according to the obtained hardness, look up the table or calculate its h value. This method not only has a large workload, but also has many factors that affect the accuracy of the measurement results. However, the basic data used for hardness prediction are almost all based on the Grossman H value, such as STECAL(ASMln-temational) hardness prediction software, Liscic is computer prediction method of quenching intensity and hardness distribution.

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