Metals -> Structural steel -> Alloy structurall steel Characteristics of the material 20KHN3À ( 20HN3À, 20ÕÍ3À ).
Material : 20KHN3À ( 20HN3À, 20ÕÍ3À ) Substitute: 20ÕÃÍÐ, 20ÕÍÃ, 38ÕÀ, 15Õ2ÃÍ2ÒÀ, 20ÕÃÐ Classification : Alloy structurall steel
Chemical composition in % of the material 20KHN3À ( 20HN3À, 20ÕÍ3À ) . C Si Mn Ni S P Cr Cu 0.17 - 0.24 0.17 - 0.37 0.3 - 0.6 2.75 - 3.15 max 0.025 max 0.025 0.6 - 0.9 max 0.3
Temperature of critical points of the grade 20KHN3À ( 20HN3À, 20ÕÍ3À ).
Ac1 = 730 , Ac3 (Acm ) = 810 , Ar3 (Arcm ) = 700 , Ar1 = 615 , Mn = 340
Mechanical properties under Ò=20o Ñ of the material 20KHN3À ( 20HN3À, 20ÕÍ3À ) .
Assortment
Dimension
Direct.
s â
s T
d 5
y
KCU
Heat treatment - mm - MPa MPa % % kJ / m2 - Bar Æ 15 930 735 12 55 1080 Guenching and drawing
Brinell hardness of the material 20KHN3À ( 20HN3À, 20ÕÍ3À ) (annealing) , HB 10 -1 = 255 MPa
Physical properties of the material 20KHN3À ( 20HN3À, 20ÕÍ3À ) . 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
Technological properties of the material 20KHN3À ( 20HN3À, 20ÕÍ3À ) . Weldability: limited weldability. Flakes : predisposed Temper brittleness: predisposed
Specification :
Mechanical properties :
s â - 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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