Database of Steel and Alloy (Marochnik)

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Metals -> Structural steel -> Alloy structurall steel

Characteristics of the material 40G   ( 40G,   40 ).

Material : 40G   ( 40G,   40 )
Substitute: 45, 40
Classification : Alloy structurall steel


Chemical composition in % of the material 40G   ( 40G,   40 ) .
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 of the grade 40G   ( 40G,   40 ).
Ac1 = 723 ,      Ac3(Acm) = 785 ,       Ar3(Arcm) = 770 ,       Ar1 = 680


Mechanical properties under =20o of the material 40G   ( 40G,   40 ) .
Assortment Dimension Direct. s sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Bar 25   590 350 17 45590Guenching 860oC, water, Drawing 600oC, air,


    Brinell hardness of the material   40G   ( 40G,   40 )   (annealing) ,       HB 10 -1= 207   MPa


Physical properties of the material 40G   ( 40G,   40 ) .
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     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


Technological properties of the material 40G   ( 40G,   40 ) .
  Weldability: limited weldability.
 Flakes : weakly predisposed
Temper brittleness: 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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