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Characteristics for grade     40G   ( 40Г )



      Grade :     40G   ( 40Г )
      Substitute:   45, 40Х
      Classification :   Alloy structurall steel
      Equivalent grades:   Go here



Chemical composition in % for grade   40G   ( 40Г )
C Si Mn Ni S P Cr Cu
0.37 - 0.450.17 - 0.370.7 - 1max   0.3max   0.035max   0.035max   0.3max   0.3


Temperature of critical points for grade   40G   ( 40Г ).
Ac1 = 723 ,      Ac3(Acm) = 785 ,       Ar3(Arcm) = 770 ,       Ar1 = 680


Mechanical properties under Т=20oС for grade   40G   ( 40Г )
Assortment Dimension Direct. sв sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Bar, GOST 4543-71 Ø 25   590 350 17 45590Guenching 860oC, water, Drawing 600oC, air,


    Brinell hardness for     40G   ( 40Г )   ,     Bar GOST 10702-78 HB 10 -1 = 207   MPa
    Brinell hardness for     40G   ( 40Г )   (normalize) ,     Sheet trick GOST 1577-93 HB 10 -1 = 229   MPa
    Brinell hardness for     40G   ( 40Г )   (annealing) ,     Sheet trick GOST 1577-93 HB 10 -1 = 207   MPa


Technological properties for grade   40G   ( 40Г )
  Weldability: limited weldability.
 Flakes : weakly predisposed
Temper brittleness: predisposed


Physical properties for grade   40G   ( 40Г )
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     7810    
100   11.1 60   487  
200   11.7 53   483  
300   12.7        
400     47   491  
500   14.3 24      
600         575  
T E 10- 5 a 10 6 l r C R 10 9


Equivalent steels for grade     40G   ( 40Г )
Warning! Indicated both exact and nearest equivalents.
USAGermanyFranceEnglandChinaBulgariaRomania
-DIN,WNrAFNORBSGBBDSSTAS
1035
1039
1040
1041
1043
G10350
G10390
G10400
G10430
1.1157
40Mn4
35M5
40M5
150M36
40Mn
ML40Mn
40G
40Mn10



Types of delivery of grade   40G   ( 40Г )
В05 - Welding and cutting of metals., Soldering, riveting
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

  40G   ( 40Г ) - 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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