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Characteristics for grade     40KHFА   ( 40ХФА )

      Grade :     40KHFА   ( 40ХФА )
      Substitute:   40Х, 65Г, 50ХФА, 30Х3МФ
      Classification :   Alloy structurall steel
      Equivalent grades:   Go here



Chemical composition in % for grade   40KHFА   ( 40ХФА )
C Si Mn Ni S P Cr V Cu
0.37 - 0.440.17 - 0.370.5 - 0.8max   0.3max   0.025max   0.0250.8 - 1.10.1 - 0.18max   0.3


Temperature of critical points for grade   40KHFА   ( 40ХФА ).
Ac1 = 760 ,      Ac3(Acm) = 800 ,       Ar3(Arcm) = 725 ,       Ar1 = 680 ,       Mn = 218


Mechanical properties under Т=20oС for grade   40KHFА   ( 40ХФА )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Bar, GOST 4543-71 Ø 25   880 735 10 50880Guenching and drawing
Forging 100 - 300   615 395 15 40540Guenching and drawing
Forging 300 - 500   615 395 13 35490Guenching and drawing


    Brinell hardness for     40KHFА   ( 40ХФА )   (annealing) ,       GOST 4543-71 HB 10 -1 = 241   MPa


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


Physical properties for grade   40KHFА   ( 40ХФА )
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 2.15   37 7810    
100 2.12 12.1 37   466  
200 2.05 12.6 37   508  
300 1.99 13 36   529  
400 1.82 13.3 33   563  
500 1.73 13.8 31   592  
600 1.66 14.2 31   621  
700 1.44 14.6 30   634  
800 1.35 11.8 28   664  
T E 10- 5 a 10 6 l r C R 10 9


Equivalent steels for grade     40KHFА   ( 40ХФА )
Warning! Indicated both exact and nearest equivalents.
USAGermanyJapanFranceEnglandEuropeanItalyBelgiumSpainSwedenBulgariaCzechia
-DIN,WNrJIS AFNORBSEN UNINBNUNESSBDSCSN
4140
4142
6135
G41400
1.7223
41CrMo4
SCM440
42CD4TS
3111-5/1
42CrMO4
708M40
41CrMO
41CrMo4
41CrMo4
40CrMo4
42CrMo4
F.1252
F.8332
2244
40ChFA
15240


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

  40KHFА   ( 40ХФА ) - 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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