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Metals -> Structural steel -> Alloy structurall steel

Characteristics of the material 20G   ( 20G,   20Г ).

Material : 20G   ( 20G,   20Г )
Substitute: 20, 30Г
Classification : Alloy structurall steel


Chemical composition in % of the material 20G   ( 20G,   20Г ) .
C Si Mn Ni S P Cr Cu
0.17 - 0.240.17 - 0.370.7 - 1max   0.3max   0.035max   0.035max   0.3max   0.3


Temperature of critical points of the grade 20G   ( 20G,   20Г ).
Ac1 = 723 ,      Ac3(Acm) = 830 ,       Ar3(Arcm) = 830 ,       Ar1 = 680 ,       Mn = 420


Mechanical properties under Т=20oС of the material 20G   ( 20G,   20Г ) .
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Bar Ж 25   450 275 24 50 Normalizing 880oC, air,


    Brinell hardness of the material   20G   ( 20G,   20Г )   (hot-rolled, annealing) ,       HB 10 -1= 170   MPa
    Brinell hardness of the material   20G   ( 20G,   20Г )   (annealing) ,       HB 10 -1= 179   MPa


Physical properties of the material 20G   ( 20G,   20Г ) .
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 2.04     7820    
100   12.5 78      
200   13.4 67   525  
300   14.4 48      
400   15.1     554  
500            
600   15.2     689  
T E 10- 5 a 10 6 l r C R 10 9


Technological properties of the material 20G   ( 20G,   20Г ) .
  Weldability: without limitations.
 Flakes : not predisposed
Temper brittleness: not predisposed



Specification :
Mechanical properties :
sв - 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/(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

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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