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Characteristics of the material 18KHGT   ( 18HGT,   18 ).

Material : 18KHGT   ( 18HGT,   18 )
Substitute: 30, 25, 123, 1224, 202, 142, 20
Classification : Alloy structurall steel


Chemical composition in % of the material 18KHGT   ( 18HGT,   18 ) .
C Si Mn Ni S P Cr Ti Cu
0.17 - 0.230.17 - 0.370.8 - 1.1max   0.3max   0.035max   0.0351 - 1.30.03 - 0.09max   0.3


Temperature of critical points of the grade 18KHGT   ( 18HGT,   18 ).
Ac1 = 740 ,      Ac3(Acm) = 825 ,       Ar3(Arcm) = 730 ,       Ar1 = 650 ,       Mn = 360


Mechanical properties under =20o of the material 18KHGT   ( 18HGT,   18 ) .
Assortment Dimension Direct. s sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Steel 5   1520 1320 12 50720Guenching 850oC, oil, Drawing 200oC, air,
Steel 20   980 730 15 551130Guenching 850oC, oil, Drawing 200oC, air,


    Brinell hardness of the material   18KHGT   ( 18HGT,   18 )   (annealing) ,       HB 10 -1= 217   MPa


Physical properties of the material 18KHGT   ( 18HGT,   18 ) .
T E 10- 5 a 10 6 l r C R 10 9
Grade MPa 1/Grade Watt/(mGrade) kg/m3 J/(kgGrade) Ohmm
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,   18 ) .
  Weldability: without limitations.
 Flakes : not predisposed
Temper brittleness: weakly predisposed



Specification :
Mechanical properties :
s - Tensile strength , [MPa]
sT - Yield stress, [MPa]
d5 - 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/(mGrade)]
r - Density , [kg/m3]
C - Specific heat ( range 20o - T ), [J/(kgGrade)]
R - Electrical resistance , [Ohmm]

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

Database of steels and alloys (Marochnik) contains information about chemical composition and properties of 1500 steels and alloys (stainless steel, alloy steel, carbone steel, structural steel, tool steel, cast iron, aluminum alloy, titanium alloy, copper alloy, nickel alloy, magnesium alloy and others).
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