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Characteristics for grade     20G   ( 20Г )

      Grade :     20G   ( 20Г )
      Substitute:   20, 30Г
      Classification :   Alloy structurall steel
      Equivalent grades:   Go here



Chemical composition in % for grade   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 for grade   20G   ( 20Г ).
Ac1 = 723 ,      Ac3(Acm) = 830 ,       Ar3(Arcm) = 830 ,       Ar1 = 680 ,       Mn = 420


Mechanical properties under Т=20oС for grade   20G   ( 20Г )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Bar, GOST 4543-71 Ø 25   450 275 24 50 Normalizing 880oC, air,
Sheet trick, GOST 1577-93     440   27   Normalizing
Sheet trick, GOST 1577-93     400   28   Annealing


    Brinell hardness for     20G   ( 20Г )   (annealing) ,       GOST 4543-71 HB 10 -1 = 179   MPa
    Brinell hardness for     20G   ( 20Г )   (normalize) ,     Sheet trick GOST 1577-93 HB 10 -1 = 197   MPa


Technological properties for grade   20G   ( 20Г )
  Weldability: without limitations.
 Flakes : not predisposed
Temper brittleness: not predisposed


Physical properties for grade   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


Equivalent steels for grade     20G   ( 20Г )
Warning! Indicated both exact and nearest equivalents.
USAGermanyJapanFranceEnglandEuropeanChinaBulgariaPolandCzechia
-DIN,WNrJIS AFNORBSEN GBBDSPNCSN
1021
1022
G10210
G10220
H15211
20Mn6
STB510
TU48C
080A20
90440
1.1133
20Mn5
20MnG
20G
20G
25
12022

Types of delivery of grade   20G   ( 20Г )
В22 - Graded and shaped rolling
B23 - Sheets and Strips
В32 - Graded and shaped rolling
B33 - Sheets and Strips
В71 - Low-carbon steel wire


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

  20G   ( 20Г ) - Alloy structurall steel: chemical composition, mechanical and physical properties, hardness
Database of steels and alloys (Marochnik) contains information about chemical composition and properties more then 3000 steels and alloys

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