Hardness values conversion
Here is the link to the page containing the online application for hardness values conversion.
Attention! Formulas for hardness values conversion were obtained by approximation of the values contained in the tables of ASTM E 140, and give only approximate results. For a more accurate conversion of hardness values you should refer to the above mentioned standard.
Here is the link to the page containing the application for calculation of melting temperature, AC3 and AC1, equivalents of C, Mn, N (temporary only russian version is available).
Calculation of hardenability
Here is the link to the page containing the application for hardenability calculation.