Metals -> Structural steel -> Alloy structurall steel Characteristics of the material 38KHMÀ ( 38HMÀ, 38ÕÌÀ ).
Material : 38KHMÀ ( 38HMÀ, 38ÕÌÀ ) Classification : Alloy structurall steel
Chemical composition in % of the material 38KHMÀ ( 38HMÀ, 38ÕÌÀ ) . C Si Mn Ni S P Cr Mo Cu 0.35 - 0.42 0.17 - 0.37 0.35 - 0.65 max 0.3 max 0.025 max 0.025 0.9 - 1.3 0.2 - 0.3 max 0.3
Temperature of critical points of the grade 38KHMÀ ( 38HMÀ, 38ÕÌÀ ).
Ac1 = 758 , Ac3 (Acm ) = 805 , Ar3 (Arcm ) = 725 , Ar1 = 650
Mechanical properties under Ò=20o Ñ of the material 38KHMÀ ( 38HMÀ, 38ÕÌÀ ) .
Assortment
Dimension
Direct.
s â
s T
d 5
y
KCU
Heat treatment - mm - MPa MPa % % kJ / m2 - Bar Æ 25 980 885 11 45 690 Guenching 850o C, oil, Drawing 600o C, air,
Physical properties of the material 38KHMÀ ( 38HMÀ, 38ÕÌÀ ) . 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 2.11 33 257 100 2.01 12.4 35 496 280 200 1.94 13.1 38 508 310 300 1.84 13.7 39 525 380 400 1.74 14.2 36 538 470 500 1.69 14.5 34 567 580 600 1.66 14.6 33 600 720 700 1.41 14.7 31 672 870 800 1.29 11.2 27 697 1060 T E 10- 5 a 10 6 l r C R 10 9
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]
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