The materials for selection and the heat treatment
The nitrided steel, N00 72h two-stage gas nitriding)
The high-speed tool steel, W6 (vacuum quenching);
The die steel, D2(1.2379, SKD11,K110) (quenching + tempering);
The bimetal composite rods (inside tough, outside hard or corrosion resistant), supplied by SAAR company from German or HTM company from Swiss;
Other special materials such as Hastelloy, W-C, nickel-based alloy, etc.
