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Characteristics of the material 40KH   ( 40H,   40 ).

Material : 40KH   ( 40H,   40 )
Substitute: 45, 38, 40, 40, 40, 40
Classification : Alloy structurall steel


Chemical composition in % of the material 40KH   ( 40H,   40 ) .
C Si Mn Ni S P Cr Cu
0.36 - 0.440.17 - 0.370.5 - 0.8max   0.3max   0.035max   0.0350.8 - 1.1max   0.3


Temperature of critical points of the grade 40KH   ( 40H,   40 ).
Ac1 = 743 ,      Ac3(Acm) = 782 ,       Ar3(Arcm) = 730 ,       Ar1 = 693


Mechanical properties under =20o of the material 40KH   ( 40H,   40 ) .
Assortment Dimension Direct. s sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Disk   tangent 570 320 17 35400 
Bar 28 - 55 longitudinal 940 800 13 55850 
Bar 25   980 785 10 45590Guenching 860oC, oil, Drawing 500oC, water,


    Brinell hardness of the material   40KH   ( 40H,   40 )   (annealing) ,       HB 10 -1= 217   MPa


Physical properties of the material 40KH   ( 40H,   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 2.14     7820   210
100 2.11 11.9 46 7800 466 285
200 2.06 12.5 42.7 7770 508 346
300 2.03 13.2 42.3 7740 529 425
400 1.85 13.8 38.5 7700 563 528
500 1.76 14.1 35.6 7670 592 642
600 1.64 14.4 31.9 7630 622 780
700 1.43 14.6 28.8 7590 634 936
800 1.32   26 7610 664 1100
900     26.7 7560   1140
1000     28 7510   1170
1100     28.8 7470   120
1200       7430   1230
T E 10- 5 a 10 6 l r C R 10 9


Technological properties of the material 40KH   ( 40H,   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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