Since it is to be used to produce heat-treated tooling material, then it can pick sloppy, must meet certain basic conditions. Before you can select on the basis of conditions on how to best performance is preferred.

Heat treatment of tooling materials, first affirmed to facilitate the lifting and the workpiece when the heating and cooling process, which serves to prevent or mitigate the effects of deformation. Secondly, but also be able to withstand repeated use, which is to protect tooling repeated heating without deformation basis, extending its life. Another point that is to facilitate the processing and manufacturing, and have low cost.
On these conditions, the gray cast iron, carbon and crystal structure at room temperature for the α-Fe, the body-centered cubic lattice, organizations ferrite pearlite or martensite are all satisfactory. But to say that the best and most practical or 1Cr18Ni9Ti, due to the low transformation point of this material, it was cooled at room temperature until no phase transformations, crystal structure did not change after heating, the heat treatment is particularly appropriate use of tooling.