Metals -> Structural steel -> Alloy structurall steel Characteristics of the material 40KHS ( 40HS, 40ÕÑ ).
Material : 40KHS ( 40HS, 40ÕÑ ) Substitute: 38ÕÑ, 35ÕÃÒ Classification : Alloy structurall steel
Chemical composition in % of the material 40KHS ( 40HS, 40ÕÑ ) . C Si Mn Ni S P Cr Cu 0.37 - 0.45 1.2 - 1.6 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 40KHS ( 40HS, 40ÕÑ ).
Ac1 = 763 , Ac3 (Acm ) = 810 , Ar3 (Arcm ) = 735 , Ar1 = 680 , Mn = 320
Mechanical properties under Ò=20o Ñ of the material 40KHS ( 40HS, 40ÕÑ ) .
Assortment Dimension Direct. s â s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - Bar Æ 20 960 800 19 62 1220 Guenching 900o C, oil, Drawing 640o C, water, Bar Æ 40 930 730 19 59 1080 Guenching 900o C, oil, Drawing 640o C, water, Bar Æ 60 870 700 19 54 880 Guenching 900o C, oil, Drawing 640o C, water,
Brinell hardness of the material 40KHS ( 40HS, 40ÕÑ ) (annealing) , HB 10 -1 = 255 MPa
Physical properties of the material 40KHS ( 40HS, 40ÕÑ ) . 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 2.19 7740 100 11.7 7720 200 12.7 36 7690 300 13.4 400 14 35 7620 500 14.4 600 14.8 34 7540 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 40KHS ( 40HS, 40ÕÑ ) . Weldability: hard weldability. Flakes : 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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