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Characteristics for grade     30G   ( 30Г )

      Grade :     30G   ( 30Г )
      Substitute:   35, 40Г
      Classification :   Alloy structurall steel
      Equivalent grades:   Go here



Chemical composition in % for grade   30G   ( 30Г )
C Si Mn Ni S P Cr Cu
0.27 - 0.350.17 - 0.370.7 - 1max   0.3max   0.035max   0.035max   0.3max   0.3


Temperature of critical points for grade   30G   ( 30Г ).
Ac1 = 723 ,      Ac3(Acm) = 810 ,       Ar3(Arcm) = 785 ,       Ar1 = 680 ,       Mn = 870


Mechanical properties under Т=20oС for grade   30G   ( 30Г )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Bar, GOST 4543-71 Ø 25   540 315 20 45780Guenching 860oC, water, Drawing 600oC, air,


    Brinell hardness for     30G   ( 30Г )   (annealing) ,       GOST 4543-71 HB 10 -1 = 197   MPa
    Brinell hardness for     30G   ( 30Г )   (normalize) ,     Sheet trick GOST 1577-93 HB 10 -1 = 217   MPa
    Brinell hardness for     30G   ( 30Г )   (annealing) ,     Sheet trick GOST 1577-93 HB 10 -1 = 187   MPa


Technological properties for grade   30G   ( 30Г )
  Weldability: limited weldability.
 Flakes : not predisposed
Temper brittleness: predisposed


Physical properties for grade   30G   ( 30Г )
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     7810    
100   12.6 76   470  
200   13.9 65   483  
300   14.6 53   546  
400   15 44   601  
500   15.5 38   764  
600   15.6        
700   14.8        
T E 10- 5 a 10 6 l r C R 10 9


Equivalent steels for grade     30G   ( 30Г )
Warning! Indicated both exact and nearest equivalents.
USAGermanyJapanFranceEnglandEuropeanItalyBelgiumSpainChinaBulgariaHungaryPoland
-DIN,WNrJIS AFNORBSEN UNINBNUNEGBBDSMSZPN
1030
1330
G10300
G10330
G13300
1.1170
1.1170
28Mn4
28Mn6
30Mn4
SCMn1
20M5
28Mn6
150M19
150M28
28Mn6
1.1170
28Mn6
28Mn6
C28Mn
28Mn6
28Mn6
30Mn
30Mn2
ML30Mn
28Mn6
30G
28Mn6
30G2

Types of delivery of grade   30G   ( 30Г )
В22 - Graded and shaped rolling
B23 - Sheets and Strips
В32 - Graded and shaped rolling
B33 - Sheets and Strips


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

  30G   ( 30Г ) - 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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