Metals -> Structural steel -> Alloy structurall steel Characteristics of the material 18KHGT ( 18HGT, 18ÕÃÒ ).
Material : 18KHGT ( 18HGT, 18ÕÃÒ ) Substitute: 30ÕÃÒ, 25ÕÃÒ, 12ÕÍ3À, 12Õ2Í4À, 20ÕÍ2Ì, 14ÕÃÑÍ2ÌÀ, 20ÕÃÐ Classification : Alloy structurall steel
Chemical composition in % of the material 18KHGT ( 18HGT, 18ÕÃÒ ) . C Si Mn Ni S P Cr Ti Cu 0.17 - 0.23 0.17 - 0.37 0.8 - 1.1 max 0.3 max 0.035 max 0.035 1 - 1.3 0.03 - 0.09 max 0.3
Temperature of critical points of the grade 18KHGT ( 18HGT, 18ÕÃÒ ).
Ac1 = 740 , Ac3 (Acm ) = 825 , Ar3 (Arcm ) = 730 , Ar1 = 650 , Mn = 360
Mechanical properties under Ò=20o Ñ of the material 18KHGT ( 18HGT, 18ÕÃÒ ) .
Assortment Dimension Direct. s â s T
d 5
y KCU Heat treatment - mm - MPa MPa % % kJ / m2 - Steel 5 1520 1320 12 50 720 Guenching 850o C, oil, Drawing 200o C, air, Steel 20 980 730 15 55 1130 Guenching 850o C, oil, Drawing 200o C, air,
Brinell hardness of the material 18KHGT ( 18HGT, 18ÕÃÒ ) (annealing) , HB 10 -1 = 217 MPa
Physical properties of the material 18KHGT ( 18HGT, 18ÕÃÒ ) . 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 37 7800 100 2.05 10 38 495 200 1.97 11.5 38 508 300 1.91 12.3 37 525 400 1.76 12.8 35 537 500 1.68 13.3 34 567 600 1.55 13.6 31 588 700 1.36 30 626 800 1.29 29 705 T E 10- 5 a 10 6 l r C R 10 9
Technological properties of the material 18KHGT ( 18HGT, 18ÕÃÒ ) . Weldability: without limitations. Flakes : not predisposed Temper brittleness: weakly 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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