Metals -> Structural steel -> Alloy structurall steel Characteristics of the material 38KHS ( 38HS, 38ÕÑ ).
Material : 38KHS ( 38HS, 38ÕÑ ) Substitute: 40ÕÑ Classification : Alloy structurall steel
Chemical composition in % of the material 38KHS ( 38HS, 38ÕÑ ) . C Si Mn Ni S P Cr Cu 0.34 - 0.42 1 - 1.4 0.3 - 0.6 max 0.3 max 0.035 max 0.035 1.3 - 1.6 max 0.3
Temperature of critical points of the grade 38KHS ( 38HS, 38ÕÑ ).
Ac1 = 763 , Ac3 (Acm ) = 810 , Ar3 (Arcm ) = 755 , Ar1 = 680 , Mn = 330
Mechanical properties under Ò=20o Ñ of the material 38KHS ( 38HS, 38ÕÑ ) .
Assortment
Dimension
Direct.
s â
s T
d 5
y
KCU
Heat treatment - mm - MPa MPa % % kJ / m2 - Forging to 100 685 540 15 45 590 Guenching and drawing Bar Æ 25 930 735 12 50 690 Guenching 900o C, water, Drawing 630o C, water,
Brinell hardness of the material 38KHS ( 38HS, 38ÕÑ ) (annealing) , HB 10 -1 = 255 MPa
Physical properties of the material 38KHS ( 38HS, 38ÕÑ ) . 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 38 7640 284 100 2.03 12.3 38 466 329 200 1.94 13.1 37 508 413 300 1.84 13.6 35 529 563 400 1.74 13.8 34 563 725 500 1.66 14.2 33 592 902 600 1.57 14.5 31 621 1060 700 1.39 14.7 29 634 1280 800 1.27 12.5 28 663 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 38KHS ( 38HS, 38ÕÑ ) . Weldability: hard weldability. Flakes : not 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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