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AISI Type 321
Category Steel
Class Stainless steel
Type Austenitic standard
Common Names Chromium-Nickel steel
Designations  France: AFNOR Z 6 CNT 18.10
Germany: DIN 1.4641
Italy: UNI  ICL 472 T , UNI KG , UNI KT , UNI KW , UNI X 6 CrNiTi 18 11
Japan: JIS SUS 321
Sweden: SS 2337
United Kingdom: B.S. 321 S 12 , B.S. 321 S 18 , B.S. 321 S 22 , B.S. 321 S 27 , B.S. 321 S 40 , B.S. 321 S 49 , B.S. 321 S 50 , B.S. 321 S 59 , B.S. 321 S 87 , B.S. CDS-20 , B.S. En. 58 B , B.S. En. 58 C
United States: AMS 5510 , AMS 5557 , AMS 5559 , AMS 5570 , AMS 5576 , AMS 5645 , AMS 5689 , ASME SA182 , ASME SA193 , ASME SA194 , ASME SA213 , ASME SA240 , ASME SA249 , ASME SA312 , ASME SA320 , ASME SA358 , ASME SA376 , ASME SA403 , ASME SA409 , ASME SA430 , ASME SA479 , ASTM A167 , ASTM A182 , ASTM A193 , ASTM A194 , ASTM A213 , ASTM A240 , ASTM A249 , ASTM A269 , ASTM A271 , ASTM A276 , ASTM A312 , ASTM A314 , ASTM A320 , ASTM A358 , ASTM A376 , ASTM A403 , ASTM A409 , ASTM A430 , ASTM A473 , ASTM A479 , ASTM A493 , ASTM A511 , ASTM A580 , FED QQ-S-763 , FED QQ-S-766 , FED QQ-W-423 , MIL SPEC MIL-S-862 , SAE 30321 , SAE J405 (30321) , UNS S32100

Composition
ElementWeight %
C  0.08 
Mn  2.00 
Si  1.00 
Cr  17.0-19.0 
Ni  9.0-12.0 
P  0.045 
S  0.03 
Ti  0.4 (min) 

Mechanical Properties
Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 8 25  
Poisson's Ratio 0.27-0.30 25  
Elastic Modulus (GPa) 193 25  
Tensile Strength (Mpa) 515  25  hot finished and annealed (wire) more
Yield Strength (Mpa) 205 
Elongation (%) 40 
Reduction in Area (%) 50 
Hardness (HRB) 88 (max)  25  annealed (plate, sheet, strip) 

Thermal Properties
Properties Conditions 
T (°C)Treatment
Thermal Expansion (10-6/ºC) 16.6  0-100 more  
Thermal Conductivity (W/m-K) 16.1  100 more  
Specific Heat (J/kg-K) 500  0-100   

Electric Properties
Properties Conditions 
T (°C)Treatment
Electric Resistivity (10-9W-m) 720  25   
Glossary