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AISI Type 444
Category Steel
Class Stainless steel
Type Ferritic nonstandard
Common Names Chromium steel
Designations  United States: ASTM A176 , SAE 51444

Composition
ElementWeight %
C  0.03 
Mn  1.00 
Si  1.00 
Cr  17.5-19.5 
Ni  1.0 
P  0.04 
S  0.03 
Mo  1.75-2.5 
N  0.035 (max) 
Ti+Nb  0.44 (min) 

Mechanical Properties
Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 7.8 25  
Poisson's Ratio 0.27-0.30 25  
Elastic Modulus (GPa) 200 25  
Tensile Strength (Mpa) 415  25  annealed (plate, sheet, strip) 
Yield Strength (Mpa) 275 
Elongation (%) 20 
Reduction in Area (%)  
Hardness (HRB) 95 (max)  25  annealed (plate, sheet, strip) 

Thermal Properties
Properties Conditions 
T (°C)Treatment
Thermal Expansion (10-6/ºC) 10  0-100 more  
Thermal Conductivity (W/m-K) 26.8  100   
Specific Heat (J/kg-K) 420  0-100   

Electric Properties
Properties Conditions 
T (°C)Treatment
Electric Resistivity (10-9W-m) 620  25   
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