1.4923, is the standard material of construction for components such as steam turbines and heat resistant screws etc. The vanadium addition serves to improve the creep and high temperature strength properties of this steel.

Corrosion resistance  (PRE = 13,64 to 16,46)

Due to its relatively low chromium content, the corrosion resistance of 1.4923, is somewhat limited, but sufficient to resist corrosion in rural and urban atmospheres, provided no chlorides or salts are present. 1.4923 is resistant to steam.

Heat treatment / mechanical properties

Optimal mechanical properties may be attained by quenching and tempering, in which the steel is first hardened by holding the steel at a temperature between 1020 and 1070°C followed by quenching in air, oil or polymer. The tempering temperature is dependent on the desired

strength. In most cases a tempering treatment in the temperature range 640 to 740°C followed by air cooling produces the required properties. In this condition, the following mechanical proper- ties can be expected:

Property  Spec QT800  Typical

- yield strength (N/mm 2 )  R p0,2 : ≥ 600 

- tensile strength (N/mm 2 )  R m : 800 – 900 

- tensile elongation (%)  A 5 : ≥14 

- impact energy (J)  @ 25°C ISO-V : ≥50J

Property  Spec QT900

- yield strength (N/mm 2 )  R p0,2 : ≥ 700 

- tensile strength (N/mm 2 )  R m : 900 – 1050  960

- tensile elongation (%)  A 5  :  ≥11