Metals -> Structural steel -> Alloy structurall steel Characteristics of the material 38KH2N2MÀ ( 38H2N2MÀ, 38Õ2Í2ÌÀ ).
Material : 38KH2N2MÀ ( 38H2N2MÀ, 38Õ2Í2ÌÀ ) ( 38ÕÍÌÀ ) Classification : Alloy structurall steel
Chemical composition in % of the material 38KH2N2MÀ ( 38H2N2MÀ, 38Õ2Í2ÌÀ ) . C Si Mn Ni S P Cr Mo Cu 0.33 - 0.4 0.17 - 0.37 0.25 - 0.5 1.3 - 1.7 max 0.025 max 0.025 1.3 - 1.7 0.2 - 0.3 max 0.3
Temperature of critical points of the grade 38KH2N2MÀ ( 38H2N2MÀ, 38Õ2Í2ÌÀ ).
Ac1 = 753 , Ac3 (Acm ) = 790 , Ar3 (Arcm ) = 490 , Ar1 = 370 , Mn = 320
Mechanical properties under Ò=20o Ñ of the material 38KH2N2MÀ ( 38H2N2MÀ, 38Õ2Í2ÌÀ ) .
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 38KH2N2MÀ ( 38H2N2MÀ, 38Õ2Í2ÌÀ ) (annealing) , HB 10 -1 = 269 MPa
Physical properties of the material 38KH2N2MÀ ( 38H2N2MÀ, 38Õ2Í2ÌÀ ) . 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 2.13 38 322 100 2.06 11.9 37 490 398 200 1.94 12.5 35 502 482 300 1.8 13.1 35 523 592 400 1.74 13.3 33 532 740 500 1.64 13.8 32 565 910 600 1.57 14.1 30 590 1090 700 1.41 14.6 28 615 1300 800 1.29 11.8 28 670 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 38KH2N2MÀ ( 38H2N2MÀ, 38Õ2Í2ÌÀ ) . Weldability: is not used. 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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