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Metals -> Structural steel -> Alloy structurall steel

Characteristics of the material 45KH   ( 45H,   45 ).

Material : 45KH   ( 45H,   45 )
Substitute: 40, 50, 45, 40, 40, 402
Classification : Alloy structurall steel


Chemical composition in % of the material 45KH   ( 45H,   45 ) .
C Si Mn Ni S P Cr Cu
0.41 - 0.490.17 - 0.370.5 - 0.8max   0.3max   0.035max   0.0350.8 - 1.1max   0.3


Temperature of critical points of the grade 45KH   ( 45H,   45 ).
Ac1 = 735 ,      Ac3(Acm) = 770 ,       Ar3(Arcm) = 690 ,       Ar1 = 660 ,       Mn = 355


Mechanical properties under =20o of the material 45KH   ( 45H,   45 ) .
Assortment Dimension Direct. s sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Forging to 100   570 315 17 38390Normalizing
Forging 300 - 500   570 315 12 30290Normalizing
Forging 500 - 800   570 315 11 30290Normalizing
Bar 25   1030 835 9 45490Guenching 840oC, oil, Drawing 520oC, water,


    Brinell hardness of the material   45KH   ( 45H,   45 )   (annealing) ,       HB 10 -1= 229   MPa


Physical properties of the material 45KH   ( 45H,   45 ) .
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 2.06     7820    
100   12.8        
200   13        
300   13.7        
T E 10- 5 a 10 6 l r C R 10 9


Technological properties of the material 45KH   ( 45H,   45 ) .
  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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