What material is used for the THK rail?

            The THK rail is mainly made of austenitic stainless steel and martensitic stainless steel.

            (1) Austenitic stainless steel means stainless steel having an austenitic structure at room

 temperature. The steel contains about 18% Cr, Ni 8% to 10%, and C about 0.1%. Austenitic chrome-

nickel stainless steels include the famous 18Cr-8Ni steel and high Cr-Ni series steel. The high Cr-Ni series

 steel is a high-Cr-Ni series steel which is developed by increasing the contents of Cr and Ni and adding

 elements such as Mo, Cu, Si, Nb and Ti.

            (2) Martensitic stainless steel is a stainless steel whose mechanical properties can be adjusted by

 heat treatment. Typical brands are Cr13 type, such as 2Cr13, 3Cr13, 4Cr13 and so on. After quenching,

 the hardness is high, the tempering temperature is different, and the combination of strength and

 toughness is different, mainly used for steam turbine blades, tableware, surgical instruments and the

 like. According to the chemical composition, martensitic stainless steel can be divided into martensite

 chromium steel and martensitic chromium nickel steel.