Chemical Composition
Base Element
C (Carbon)
0.37 to 0.44
%    
Cr (Chromium)
0.4
%  (maximum)  
Cu (Copper)
0.3
%  (maximum)  
Fe (Iron)
97.1 to 99
%    (estimate)
Mn (Manganese)
0.5 to 0.8
%    
Mo (Molybdenum)
0.1
%  (maximum)  
Ni (Nickel)
0.4
%  (maximum)  
P (Phosphorus)
0.045
%  (maximum)  
S (Sulfur)
0.045
%  (maximum)  
Si (Silicon)
0.1 to 0.4
%    
Balance
Other elements
Cr + Mo + Ni ≤ 0.63 %
Composition Note
1) Cast analysis.
2) The steel shall be supplied in the killed condition.
3) Steels with improved machinability either by higher S levels up to about 0.10 % S (including controlled sulphide morphology) or Pb additions may be available on request. In the first case, the upper limit for the Mn content may be increased by 0.15 %.
4) Fe is listed as a Base element for this material, but its % value is not listed in the specification. The value shown is a calculated one.
 
Mechanical Properties
Tabular Data
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DimensionsYield Strength (lbf/ft^2)Ultimate Tensile Strength (lbf/ft^2)Elongation (% strain)
Diameter or thickness, ≤ 16 mm≥ 6.68e6≥ 1.21e7≥ 16
Diameter or thickness, > 16 to ≤ 100 mm≥ 6.06e6≥ 1.15e7≥ 17
Diameter or thickness, > 100 to ≤ 250 mm≥ 5.43e6≥ 1.11e7≥ 17
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Yield Strength
5.43e6
lbf/ft^2  (minimum)  
Ultimate Tensile Strength
1.11e7
lbf/ft^2  (minimum)  
Elongation
17
% strain  (minimum)  
Condition
Normalized (+N temper)
Notes on Mechanical Properties
Mechanical properties for products with a diameter or thickness > 100 mm to ≤ 250 mm.
 
Other Information
Material Class
Alloy Family
Alloy Group
Alloy Sub-Group
Country
Standards Body
Description
Non alloy steels for quenching and tempering
Designation
C40
Specification Type
Specification
ISO 683-1
Specification Year
2016
Specification Status
Organization
International Organization for Standardization (ISO)
Available forms
Similar Alloys
 
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