Database of Steel and Alloy (Marochnik)

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Characteristics of the material 38KHÀ   ( 38HÀ,   38ÕÀ ).

Material : 38KHÀ   ( 38HÀ,   38ÕÀ )
Substitute: 40Õ, 35Õ, 40ÕÍ
Classification : Alloy structurall steel


Chemical composition in % of the material 38KHÀ   ( 38HÀ,   38ÕÀ ) .
C Si Mn Ni S P Cr Cu
0.35 - 0.420.17 - 0.370.5 - 0.8max   0.3max   0.025max   0.0250.8 - 1.1max   0.3


Temperature of critical points of the grade 38KHÀ   ( 38HÀ,   38ÕÀ ).
Ac1 = 740 ,      Ac3(Acm) = 780 ,       Ar3(Arcm) = 730 ,       Ar1 = 693 ,       Mn = 250


Mechanical properties under Ò=20oÑ of the material 38KHÀ   ( 38HÀ,   38ÕÀ ) .
Assortment Dimension Direct. sâ sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Bar Æ 25   930 780 12 50880Guenching 860oC, oil, Drawing 550oC, water,


    Brinell hardness of the material   38KHÀ   ( 38HÀ,   38ÕÀ )   (annealing) ,       HB 10 -1= 207   MPa


Physical properties of the material 38KHÀ   ( 38HÀ,   38ÕÀ ) .
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 1.96     7850   290
100   12.7 50      
200   13.1 46 7800    
300   13.5 42      
400   13.8 40      
500   14.2 37      
600   14.6 35 7650    
700     31      
T E 10- 5 a 10 6 l r C R 10 9


Technological properties of the material 38KHÀ   ( 38HÀ,   38ÕÀ ) .
  Weldability: hard weldability.
 Flakes : predisposed
Temper brittleness: predisposed



Specification :
Mechanical properties :
sâ - 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

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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