Metals -> Structural steel -> Alloy structurall steel Characteristics of the material 38KHN3MÀ ( 38HN3MÀ, 38ÕÍ3ÌÀ ).
Material : 38KHN3MÀ ( 38HN3MÀ, 38ÕÍ3ÌÀ ) Substitute: 38ÕÍ3ÂÀ Classification : Alloy structurall steel
Chemical composition in % of the material 38KHN3MÀ ( 38HN3MÀ, 38ÕÍ3ÌÀ ) . C Si Mn Ni S P Cr Mo Cu 0.33 - 0.4 0.17 - 0.37 0.25 - 0.5 2.75 - 3.25 max 0.025 max 0.025 0.8 - 1.2 0.2 - 0.3 max 0.3
Temperature of critical points of the grade 38KHN3MÀ ( 38HN3MÀ, 38ÕÍ3ÌÀ ).
Ac1 = 730 , Ac3 (Acm ) = 770 , Ar3 (Arcm ) = 315 , Ar1 = 300
Mechanical properties under Ò=20o Ñ of the material 38KHN3MÀ ( 38HN3MÀ, 38ÕÍ3ÌÀ ) .
Assortment Dimension Direct. s â s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - Bar Æ 25 1080 980 12 50 780 Guenching and drawing
Brinell hardness of the material 38KHN3MÀ ( 38HN3MÀ, 38ÕÍ3ÌÀ ) (annealing) , HB 10 -1 = 269 MPa
Physical properties of the material 38KHN3MÀ ( 38HN3MÀ, 38ÕÍ3ÌÀ ) . 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 2.07 36 292 100 2.03 11.8 36 496 317 200 1.96 12.3 36 508 358 300 1.92 12.7 35 525 425 400 1.82 13.1 34 538 506 500 1.73 13.4 33 567 602 600 1.67 13.7 31 601 742 700 1.47 13.9 30 672 890 800 1.35 10.8 29 697 1100 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 38KHN3MÀ ( 38HN3MÀ, 38ÕÍ3ÌÀ ) . 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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