Chemical Composition
Base Element
C (Carbon)
0.45
%    
Cr (Chromium)
0.85
%    
Fe (Iron)
95.7
%    (estimate)
Mn (Manganese)
0.75
%    
Mo (Molybdenum)
0.3
%    
Ni (Nickel)
2
%    
Balance
Composition Note
Fe is listed as a Balance element for this material, but its % value is not listed in the specification. The value shown is a calculated one.
 
Mechanical Properties
Yield Strength
1030 to 1240
MPa    
Ultimate Tensile Strength
1240 to 1450
MPa    
Brinell Hardness
330 to 400
   
 
Other Information
Material Class
Country
USA
Description
Heat treated: 180,000-210,000 TS; 150,000-180,000 YP; 20-25 RA; 330-400 HB; For general and structural castings, shafts, gears, housings. AISI 4340. Shock resistant.
Designation
BIRDSBORO-40A3
Specification Type
Specification Status
Source
Available forms
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