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Characteristics for grade     20KH   ( 20Х )

      Grade :     20KH   ( 20Х )
      Substitute:   15Х, 20ХН, 12ХН2, 18ХГТ
      Classification :   Alloy structurall steel
      Equivalent grades:   Go here
Grade   20KH   ( 20Х ):   supplier   Auremo   www.auremo.biz
Sale:   Russia +7 (812) 680-16-77 ,   Germany +49 (208) 205-83-073,     info [a] auremo.org



Chemical composition in % for grade   20KH   ( 20Х )
C Si Mn Ni S P Cr Cu
0.17 - 0.230.17 - 0.370.5 - 0.8max   0.3max   0.035max   0.0350.7 - 1max   0.3


Temperature of critical points for grade   20KH   ( 20Х ).
Ac1 = 750 ,      Ac3(Acm) = 825 ,       Ar3(Arcm) = 755 ,       Ar1 = 665 ,       Mn = 390


Mechanical properties under Т=20oС for grade   20KH   ( 20Х )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Pipe, GOST 8731-87     431   16    
Bar, GOST 4543-71 Ø 15   780 635 11 40590Guenching and drawing


    Brinell hardness for     20KH   ( 20Х )   (annealing) ,       GOST 4543-71 HB 10 -1 = 179   MPa
    Brinell hardness for     20KH   ( 20Х )   (cold-worked) ,       GOST 4543-71 HB 10 -1 = 229   MPa
    Brinell hardness for     20KH   ( 20Х )   ,     Bar GOST 10702-78 HB 10 -1 = 163   MPa


Technological properties for grade   20KH   ( 20Х )
  Weldability: without limitations.
 Flakes : weakly predisposed
Temper brittleness: not predisposed


Physical properties for grade   20KH   ( 20Х )
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 2.16   42 7830    
100 2.13 10.5 42 7810 496  
200 1.98 11.6 41 7780 508  
300 1.93 12.4 40   525  
400 1.81 13.1 38 7710 537  
500 1.71 13.6 36   567  
600 1.65 14 33 7640 588  
700 1.43   32   626  
800 1.33   31   706  
T E 10- 5 a 10 6 l r C R 10 9


Equivalent steels for grade     20KH   ( 20Х )
Warning! Indicated both exact and nearest equivalents.
USAGermanyJapanEnglandEuropeanBulgariaHungaryPoland
-DIN,WNrJIS BSEN BDSMSZPN
5117
5120
5120H
G51170
G51200
H51200
20Cr4
20CrS4
SCr420
SCr420H
207
20Cr4
20Ch
BC2
20H

Types of delivery of grade   20KH   ( 20Х )
B03 - Metal forming treatment. Forgings
В22 - Graded and shaped rolling
B23 - Sheets and Strips
В32 - Graded and shaped rolling
B33 - Sheets and Strips
В62 - Steel pipes and connecting parts to them
В71 - Low-carbon steel wire


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

  20KH   ( 20Х ) - 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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