441

*Type Austenite

Characteristics

    The content of 18Cr and Si secures oxidation resistance. The addition of Ti and Nb and the reduction of C and N improve high temperature strength, weldability, and formability.

Chemical compositions and physical properties

Designations Chemical compositions (%) Mechanical properties Physical properties
 JIS   POSCO   C   Cr   Ni   Mo   Orthers   Yield 
 Strength 
 N/mm² 
 Tensile 
 Strength 
 N/mm² 
 Elongate 

 % 
 Hadness 

 Hv 
 Specific 
 Heat 
 J/gºC 
 Specific 
 Gravity 
 Thermal 
 Expansion 
 Coefficient 
 W/m-ºC 
 Thermal 
 Conductivity 
 W/m-ºC 
 441   441   ≤0.03   17.5~18.5   -   -   Ti 0.1~0.6   ≥320   ≥470   ≥32   ≤165   0.46   7.75   6.5   24.9 

Applications

    - Auto exhaust system: Heat-resistant parts such as exhaust pipes, front pipe and adapter.