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Characteristics for grade     40KHS   ( 40ХС )

      Grade :     40KHS   ( 40ХС )
      Substitute:   38ХС, 35ХГТ
      Classification :   Alloy structurall steel
      Equivalent grades:     Is absent



Chemical composition in % for grade   40KHS   ( 40ХС )
C Si Mn Ni S P Cr Cu
0.37 - 0.451.2 - 1.60.3 - 0.6max   0.3max   0.035max   0.0351.3 - 1.6max   0.3


Temperature of critical points for grade   40KHS   ( 40ХС ).
Ac1 = 763 ,      Ac3(Acm) = 810 ,       Ar3(Arcm) = 735 ,       Ar1 = 680 ,       Mn = 320


Mechanical properties under Т=20oС for grade   40KHS   ( 40ХС )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Bar Ø 20   960 800 19 621220Guenching 900oC, oil, Drawing 640oC, water,
Bar Ø 40   930 730 19 591080Guenching 900oC, oil, Drawing 640oC, water,
Bar Ø 60   870 700 19 54880Guenching 900oC, oil, Drawing 640oC, water,
Bar, GOST 4543-71 Ø 25   1230 1080 12 40340Guenching and drawing


    Brinell hardness for     40KHS   ( 40ХС )   (annealing) ,       GOST 4543-71 HB 10 -1 = 255   MPa


Technological properties for grade   40KHS   ( 40ХС )
  Weldability: hard weldability.
 Flakes : predisposed
Temper brittleness: predisposed


Physical properties for grade   40KHS   ( 40ХС )
T E 10- 5 a 10 6 l r C R 10 9
Grade MPa 1/Grade Watt/(m·Grade) kg/m3 J/(kg·Grade) Ohm·m
20 2.19     7740    
100   11.7   7720    
200   12.7 36 7690    
300   13.4        
400   14 35 7620    
500   14.4        
600   14.8 34 7540    
T E 10- 5 a 10 6 l r C R 10 9


Specification :
Mechanical properties :
sв - 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/(m·Grade)]
r - Density , [kg/m3]
C - Specific heat ( range 20o - T ), [J/(kg·Grade)]
R - Electrical resistance , [Ohm·m]

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

  40KHS   ( 40ХС ) - Alloy structurall steel: chemical composition, mechanical and physical properties, hardness
Database of steels and alloys (Marochnik) contains information about chemical composition and properties more then 3000 steels and alloys

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