Metals -> Structural steel -> Alloy structurall steel Characteristics of the material 40KHN2MÀ ( 40HN2MÀ, 40ÕÍ2ÌÀ ).
Material : 40KHN2MÀ ( 40HN2MÀ, 40ÕÍ2ÌÀ ) ( 40ÕÍÌÀ ) Substitute: 40ÕÃÒ, 40ÕÃÐ, 30Õ3ÌÔ, 45ÕÍ2ÌÔÀ Classification : Alloy structurall steel
Chemical composition in % of the material 40KHN2MÀ ( 40HN2MÀ, 40ÕÍ2ÌÀ ) . C Si Mn Ni S P Cr Mo Cu 0.37 - 0.44 0.17 - 0.37 0.5 - 0.8 1.25 - 1.65 max 0.025 max 0.025 0.6 - 0.9 0.15 - 0.25 max 0.3
Temperature of critical points of the grade 40KHN2MÀ ( 40HN2MÀ, 40ÕÍ2ÌÀ ).
Ac1 = 730 , Ac3 (Acm ) = 820 , Ar3 (Arcm ) = 550 , Ar1 = 380 , Mn = 320
Mechanical properties under Ò=20o Ñ of the material 40KHN2MÀ ( 40HN2MÀ, 40ÕÍ2ÌÀ ) .
Assortment Dimension Direct. s â s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - Bar Æ 25 1080 930 12 50 780 Guenching and drawing
Brinell hardness of the material 40KHN2MÀ ( 40HN2MÀ, 40ÕÍ2ÌÀ ) (annealing) , HB 10 -1 = 269 MPa
Physical properties of the material 40KHN2MÀ ( 40HN2MÀ, 40ÕÍ2ÌÀ ) . 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 39 7850 331 100 2.11 11.6 38 490 200 2.01 12.1 37 506 300 1.9 12.7 37 522 400 1.77 13.2 35 536 500 1.73 13.6 33 565 600 13.9 31 700 29 800 27 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 40KHN2MÀ ( 40HN2MÀ, 40ÕÍ2ÌÀ ) . Weldability: hard weldability. Flakes : predisposed Temper brittleness: not 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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