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Characteristics for grade     20KHN3А   ( 20ХН3А )

      Grade :     20KHN3А   ( 20ХН3А )
      Substitute:   20ХГНР, 20ХНГ, 38ХА, 15Х2ГН2ТА, 20ХГР
      Classification :   Alloy structurall steel
      Equivalent grades:   Go here



Chemical composition in % for grade   20KHN3А   ( 20ХН3А )
C Si Mn Ni S P Cr Cu
0.17 - 0.240.17 - 0.370.3 - 0.62.75 - 3.15max   0.025max   0.0250.6 - 0.9max   0.3


Temperature of critical points for grade   20KHN3А   ( 20ХН3А ).
Ac1 = 730 ,      Ac3(Acm) = 810 ,       Ar3(Arcm) = 700 ,       Ar1 = 615 ,       Mn = 340


Mechanical properties under Т=20oС for grade   20KHN3А   ( 20ХН3А )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Bar, GOST 4543-71 Ø 15   930 735 12 551080Guenching and drawing


    Brinell hardness for     20KHN3А   ( 20ХН3А )   (annealing) ,       GOST 4543-71 HB 10 -1 = 255   MPa


Technological properties for grade   20KHN3А   ( 20ХН3А )
  Weldability: limited weldability.
 Flakes : predisposed
Temper brittleness: predisposed


Physical properties for grade   20KHN3А   ( 20ХН3А )
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 2.12   36 7850   270
100 2.04 11.5 35 7830 494 300
200 1.94 11.7 34   507 350
300 1.88 12 33 7760 523 450
400 1.69 12.6 33   536 550
500 1.69 12.8 31   565 650
600 1.53 13.2 31 7660 586  
700 1.38 13.6 30   624  
800 1.32 11.2 28   703  
T E 10- 5 a 10 6 l r C R 10 9


Equivalent steels for grade     20KHN3А   ( 20ХН3А )
Warning! Indicated both exact and nearest equivalents.
FranceSwedenBulgariaPoland
AFNORSSBDSPN
20NC11
2515
20ChN3A
20HN3A


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

  20KHN3А   ( 20ХН3А ) - 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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