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Metals -> Structural steel -> Alloy structurall steel

Characteristics of the material 30G   ( 30G,   30 ).

Material : 30G   ( 30G,   30 )
Substitute: 35, 40
Classification : Alloy structurall steel


Chemical composition in % of the material 30G   ( 30G,   30 ) .
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 of the grade 30G   ( 30G,   30 ).
Ac1 = 723 ,      Ac3(Acm) = 810 ,       Ar3(Arcm) = 785 ,       Ar1 = 680 ,       Mn = 870


Mechanical properties under =20o of the material 30G   ( 30G,   30 ) .
Assortment Dimension Direct. s sT d5 y KCU Heat treatment
- mm - MPa MPa % % kJ / m2 -
Bar 25   540 315 20 45780Guenching 860oC, water, Drawing 600oC, air,


    Brinell hardness of the material   30G   ( 30G,   30 )   (annealing) ,       HB 10 -1= 197   MPa


Physical properties of the material 30G   ( 30G,   30 ) .
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 2.04     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


Technological properties of the material 30G   ( 30G,   30 ) .
  Weldability: limited weldability.
 Flakes : not 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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