321

*Type Austenite

Characteristics

    Ti is added to 304 steel to prevent inter-granular corrosion. Applicable to usages at temperature between 430 and 900ºC

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 
 321   321   ≤0.08   9.00~13.0   9.00~13.0   -   Ti5x%Cmin   ≥205   ≥520   ≥40   ≤200   0.50   7.93   16.7   16.1 

Applications

    - Exhaust pipe of aircraft ; Boiler cover ; Heat exchanger ; Boiler pipe
    - Some parts that are impossible for heat treatment after welding or assembling