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AISI 50B50
Category Steel
Class Alloy steel
Type Standard
Common Names Boron steel
Designations  Germany: DIN 1.7138
Japan: JIS SUP 11
United States: ASTM A322 , ASTM A519 , SAE J404 , SAE J412 , SAE J770

ElementWeight %
C  0.48-0.53 
Mn  0.75-1.00 
P  0.035 (max) 
S  0.04 (max) 
Si  0.15-0.30 
Cr  0.40-0.60 
B  0.0005-0.003 

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) 190-210 25