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AISI Type 309SCb
Category Steel
Class Stainless steel
Type Austenitic nonstandard
Common Names Chromium-Nickel steel
Designations  United States: ASTM A554 , UNS S30940

Composition
ElementWeight %
C  0.08 
Mn  2.00 
Si  1.00 
Cr  22.0-24.0 
Ni  12.0-15.0 
P  0.045 
S  0.03 
Nb  0.64 (min) 

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) 200 25  
Tensile Strength (Mpa) 620  25  annealed (soft temper wire, 1.57 mm in diameter) more
Yield Strength (Mpa) 310 
Elongation (%) 45 
Reduction in Area (%)  
Hardness (HB) 156  25  annealed (soft temper wire, 12.7 mm in diameter) more

Thermal Properties
Properties Conditions 
T (°C)Treatment
Thermal Expansion (10-6/ºC) 14.9  0-100 more  
Thermal Conductivity (W/m-K) 15.6  100 more  
Glossary