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Characteristics of the material 40KHN   ( 40HN,   40 ).

Material : 40KHN   ( 40HN,   40 )
Substitute: 45, 50, 38, 40, 35, 40, 40, 30
Classification : Alloy structurall steel


Chemical composition in % of the material 40KHN   ( 40HN,   40 ) .
C Si Mn Ni S P Cr Cu
0.36 - 0.440.17 - 0.370.5 - 0.81 - 1.4max   0.035max   0.0350.45 - 0.75max   0.3


Temperature of critical points of the grade 40KHN   ( 40HN,   40 ).
Ac1 = 735 ,      Ac3(Acm) = 768 ,       Ar3(Arcm) = 700 ,       Ar1 = 660 ,       Mn = 305


Mechanical properties under =20o of the material 40KHN   ( 40HN,   40 ) .
Assortment Dimension Direct. s sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Bar 25   980 785 11 45690Guenching and drawing


    Brinell hardness of the material   40KHN   ( 40HN,   40 )   (annealing) ,       HB 10 -1= 207   MPa


Physical properties of the material 40KHN   ( 40HN,   40 ) .
T E 10- 5 a 10 6 l r C R 10 9
Grade MPa 1/Grade Watt/(mGrade) kg/m3 J/(kgGrade) Ohmm
20 2     7820    
100   11.8 44 7800    
200   12.3 43 7770    
300   13.4 41 7740    
400   14 39 7700    
500     37      
T E 10- 5 a 10 6 l r C R 10 9


Technological properties of the material 40KHN   ( 40HN,   40 ) .
  Weldability: hard weldability.
 Flakes : predisposed
Temper brittleness: predisposed



Specification :
Mechanical properties :
s - Tensile strength , [MPa]
sT - Yield stress, [MPa]
d5 - Specific elongation at fracture , [ % ]
y - Reduction of area , [ % ]
KCU - Impact strength , [ kJ / m2]
HB - Brinell hardness , [MPa]

Physical properties :
T - Test temperature , [Grade]
E - Young modulus , [MPa]
a - Coefficient of linear expansion (range 20o - T ) , [1/Grade]
l - Termal (heat) condition coefficient , [Watt/(mGrade)]
r - Density , [kg/m3]
C - Specific heat ( range 20o - T ), [J/(kgGrade)]
R - Electrical resistance , [Ohmm]

Weldability :
without limitations - welding is done without heating and subsequent heat treeting
limited weldability - welding is possible under heating up to 100-120 grade and subsequent heat treeting
hard weldability - obtaining the quality welding needs the additional operations:heating up to 200-300 grade; the heat treeting ia annealing

Database of steels and alloys (Marochnik) contains information about chemical composition and properties of 1500 steels and alloys (stainless steel, alloy steel, carbone steel, structural steel, tool steel, cast iron, aluminum alloy, titanium alloy, copper alloy, nickel alloy, magnesium alloy and others).
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