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Category Steel
Class Stainless steel
Type Precipitation-hardening standard
Designations United States: UNS S15500

ElementWeight %
C  0.07 
Mn  1.00 
Si   1.00 
Cr   14.0-15.5 
Ni   3.5-5.5 
P   0.04 
S   0.03 
Cu   2.5-4.5 
Nb+Ta   0.15-0.45 

Mechanical Properties
Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 7.7-8.03 25  
Poisson's Ratio 0.27-0.30 25  
Elastic Modulus (GPa) 196 25  
Tensile Strength (Mpa) 1070  25  H1025 (bar, plate, sheet, strip) more
Yield Strength (Mpa) 1000 
Elongation (%) 12 
Reduction in Area (%) 45 
Hardness (HRC) 35-42  25  H1025 (bar, plate, sheet, strip) more
Note: Values vary with flat-rolled products.

Thermal Properties
Properties Conditions 
T (°C)Treatment
Thermal Expansion (10-6/ºC) 10.8  0-100 more  
Thermal Conductivity (W/m-K) 17.8  100 more  
Specific Heat (J/kg-K) 420  0-100   

Electric Properties
Properties Conditions 
T (°C)Treatment
Electric Resistivity (10-9W-m) 770  25