Keywords: Quench, quenching intensity value, H value, quenching cooling, end quenching, probe, heat transfer coefficient, quenching medium, cooling, cooling curve,

　　 The method of quenching intensity value (H value) was proposed by Grossman et al. in 1939, and is still widely used in the field of quenching cooling technology and end quenching technology. The method is as follows: the average heat transfer coefficient of the selected probe cooled in still water at 18 degrees C is regarded as 1, and then the relative average heat transfer coefficient curve is calculated according to the cooling curve of the same probe when cooling in the quenching medium. The formula is
　　 h Average =(v/F)·[ρCρ/（tc-tQ）]·[p（t1-t2）/(T1-T2)]
　　 　　 tc =(t1 + t2)/2
　　 Where: h average is the average heat transfer coefficient; V is the probe volume; F is the probe surface area; & rho; And C & rho; The probe material density and specific pressure heat capacity are respectively; Tc is the average temperature in the probe; TQ is the medium temperature.
　　 It should be pointed out that the calculation unit of Grossman is heat transfer coefficient is English in, while Japan takes cm as the unit when calculating the heat transfer coefficient. There is a 2.54:1 conversion relationship between the two, which must be paid attention to when applying.

More Quenching intensity value: www.quenchtank.com/view-293.html