Metals -> Structural steel -> Alloy structurall steel Characteristics of the material 20KH ( 20H, 20Х ).
Material : 20KH ( 20H, 20Х ) Substitute: 15Х, 20ХН, 12ХН2, 18ХГТ Classification : Alloy structurall steel
Chemical composition in % of the material 20KH ( 20H, 20Х ) . C Si Mn Ni S P Cr Cu 0.17 - 0.23 0.17 - 0.37 0.5 - 0.8 max 0.3 max 0.035 max 0.035 0.7 - 1 max 0.3
Temperature of critical points of the grade 20KH ( 20H, 20Х ).
Ac1 = 750 , Ac3 (Acm ) = 825 , Ar3 (Arcm ) = 755 , Ar1 = 665 , Mn = 390
Mechanical properties under Т=20o С of the material 20KH ( 20H, 20Х ) .
Assortment
Dimension
Direct.
s в
s T
d 5
y
KCU
Heat treatment - mm - MPa MPa % % kJ / m2 - Forging to 100 390 195 26 55 590 Normalizing Forging 100 - 300 390 195 23 50 540 Normalizing Forging 300 - 500 390 195 20 45 490 Normalizing Bar Ж 15 780 635 11 40 590 Guenching and drawing
Brinell hardness of the material 20KH ( 20H, 20Х ) (annealing) , HB 10 -1 = 179 MPa Brinell hardness of the material 20KH ( 20H, 20Х ) (cold-drawn, cold-worked) , HB 10 -1 = 207 MPa
Physical properties of the material 20KH ( 20H, 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
Technological properties of the material 20KH ( 20H, 20Х ) . Weldability: without limitations. Flakes : weakly predisposed Temper brittleness: not predisposed
Specification :
Mechanical properties :
s в - Tensile strength , [MPa]
s T - Yield stress, [MPa]
d 5 - 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
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